Datasheet ADP7104 Datasheet (ANALOG DEVICES)

20 V, 500 mA, Low Noise, CMOS LDO

ADP7104

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

Trademarks and registered trademarks are the property of their respective owners.

Fax: [phone] ©2011–2012 Analog Devices, Inc. All rights reserved.

V

OUT

= 5V

V

IN

= 8V

PG

VOUTVIN

PG

GND

SENSE

EN/
UVLO

100kΩ

100kΩ

100kΩ

COUT
1µF

CIN
1µF

ON

OFF

+

+

09507-001

V

OUT

= 5V

VIN = 8V

PG

VOUTVIN

PG

GND

ADJ

EN/
UVLO

100kΩ

100kΩ

100kΩ

COUT
1µF

CIN
1µF

ON

OFF

++

13kΩ

40.2kΩ

09507-002

Data Sheet

FEATURES

Input voltage range: 3.3 V to 20 V
Maximum output current: 500 mA
Low noise: 15 µV rms for fixed output versions
PSRR performance of 60 dB at 10 kHz, V
Reverse current protection
Low dropout voltage: 350 mV at 500 mA
Initial accuracy: ±0.8%
Accuracy over line, load, and temperature: −2%/+1%
Low quiescent current (V

= 5 V), I

IN

GND

Low shutdown current: <40 µA at V

1 µF ceramic output capacitor

7 fixed output voltage options: 1.5 V, 1.8 V, 2.5 V, 3 V, 3.3 V,

5 V, and 9 V
Adjustable output from 1.22 V to V
Foldback current limit and thermal overload protection
User programmable precision UVLO/enable
Power-good indicator
8-lead LFCSP and 8-lead SOIC packages

APPLICATIONS

Regulation to noise sensitive applications: ADC, DAC circuits,

precision amplifiers, high frequency oscillators, clocks,

and PLLs
Communications and infrastructure
Medical and healthcare
Industrial and instrumentation

= 3.3 V

OUT

= 900 μA with 500 mA load

= 12 V, stable with small

IN

− VDO

IN

TYPICAL APPLICATION CIRCUITS

Figure 1. ADP7104 with Fixed Output Voltage, 5 V

Figure 2. ADP7104 with Adjustable Output Voltage, 5 V

GENERAL DESCRIPTION

The ADP7104 is a CMOS, low dropout linear regulator that
operates from 3.3 V to 20 V and provides up to 500 mA of
output current. This high input voltage LDO is ideal for
regulation of high performance analog and mixed signal
circuits operating from 19 V to 1.22 V rails. Using an
advanced proprietary architecture, it provides high power
supply rejection, low noise, and achieves excellent line and
load transient response with just a small 1 µF ceramic
output capacitor.

The

ADP7104 is available in seven fixed output voltage options

and an adjustable version, which allows output voltages that
range from 1.22 V to V

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

− VDO via an external feedback divider.

IN

The
pendent of the output voltage. A digital power-good output
allows power system monitors to check the health of the output
voltage. A user programmable precision undervoltage lockout
function facilitates sequencing of multiple power supplies.

The
and 8-lead SOIC packages. The LFCSP offers a very compact
solution and also provides excellent thermal performance for
applications requiring up to 500 mA of output current in a
small, low-profile footprint.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]

ADP7104 output noise voltage is 15 μV rms and is inde-

ADP7104 is available in 8-lead, 3 mm × 3 mm LFCSP

www.analog.com

ADP7104 Data Sheet

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

Typical Application Circuits ............................................................ 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

Input and Output Capacitor, Recommended Specifications .. 4

Absolute Maximum Ratings ............................................................ 5

Thermal Data ................................................................................ 5

Thermal Resistance ...................................................................... 5

ESD Caution .................................................................................. 5

Pin Configurations and Function Descriptions ........................... 6

REVISION HISTORY

3/12—Rev. A to Rev. B

Changes to Figure 66 ...................................................................... 18

11/11—Rev. 0 to Rev. A

Changed Low Dropout Voltage from 200 mV to 350 mV .......... 1

Changes to Dropout Voltage Parameter ........................................ 3

10/11—Revision 0: Initial Version

Typical Performance Characteristics ..............................................7

Theory of Operation ...................................................................... 16

Applications Information .............................................................. 17

Capacitor Selection .................................................................... 17

Programable Undervoltage Lockout (UVLO) ........................... 18

Power-Good Feature .................................................................. 19

Noise Reduction of the Adjustable ADP7104 ............................ 19

Current Limit and Thermal Overload Protection ................. 20

Thermal Considerations ............................................................ 20

Printed Circuit Board Layout Considerations ............................ 23

Outline Dimensions ....................................................................... 24

Ordering Guide .......................................................................... 25

Rev. B | Page 2 of 28

Data Sheet ADP7104

I

= 500 mA, VIN = 10 V, TJ = −40°C to +125°C

1600

µA

LOAD REGULATION1

∆V

/∆I

I

= 1 mA to 500 mA

0.2 %/A

I

= 150 mA

100 mV

I

= 500 mA, TJ = −40°C to +125°C

550

mV

PG Output Logic High

PG

IOH < 1 µA

1.0

V

SPECIFICATIONS

VIN = (V

Table 1.

Parameter Symbol Conditions Min Typ Max Unit

INPUT VOLTAGE RANGE VIN 3.3 20 V
OPERATING SUPPLY CURRENT I
I
I
I
I
I
I

SHUTDOWN CURRENT I
EN = GND, VIN = 12 V, TJ = −40°C to +125°C 75 µA
INPUT REVERSE CURRENT I
EN = GND, VIN = 0 V, V

OUTPUT VOLTAGE ACCURACY

Fixed Output Voltage Accuracy V

1 mA < I

Adjustable Output Voltage

1 mA < I

LINE REGULATION ∆V

I
ADJ INPUT BIAS CURRENT ADJ

SENSE INPUT BIAS CURRENT SENSE

DROPOUT VOLTAGE2 V
I

I
I
I
I

START-UP TIME3 t
CURRENT-LIMIT THRESHOLD4 I
PG OUTPUT LOGIC LEVEL

PG Output Logic Low PG

PG OUTPUT THRESHOLD

Output Voltage Falling PG

Output Voltage Rising PG

THERMAL SHUTDOWN

Thermal Shutdown Threshold TSSD TJ rising 150

Thermal Shutdown Hysteresis TS

+ 1 V) or 3.3 V (whichever is greater), EN = VIN, I

OUT

I

GND

EN = GND, VIN = 12 V 40 50 µA

GND-SD

EN = GND, VIN = 0 V, V

REV-INPUT

I

OUT

V

ADJ

Accuracy

/∆VIN VIN = (V

OUT

OUT

1 mA < I

I-BIAS

I-BIAS

I

DROPOUT

V

STA RT-UP

625 775 1000 mA

LIMIT

HIGH

IOL < 2 mA 0.4 V

LOW

− 9.2 %

FAL L

−6.5 %

RISE

15

SD-HYS

= 10 mA, CIN = C

OUT

= 100 µA, VIN = 10 V 400 µA

OUT

= 100 µA, VIN = 10 V, TJ = −40°C to +125°C 900 µA

OUT

= 10 mA, VIN = 10 V 450 µA

OUT

= 10 mA, VIN = 10 V, TJ = −40°C to +125°C 1050 µA

OUT

= 300 mA, VIN = 10 V 750 µA

OUT

= 300 mA, VIN = 10 V, TJ = −40°C to +125°C 1400 µA

OUT

= 500 mA, VIN = 10 V 900 µA

OUT

OUT

+125°C

= 10 mA –0.8 +0.8 %

OUT

< 500 mA, VIN = (V

T

I

T

OUT

OUT

= −40°C to +125°C

J

= 10 mA

OUT

< 500 mA, VIN = (V

OUT

= −40°C to +125°C

J

+ 1 V ) to 20 V, TJ = −40°C to +125°C −0.015 +0.015 %/V

OUT

OUT

= 1 mA to 500 mA, TJ = −40°C to +125°C 0.75 %/A

OUT

< 500 mA, VIN = (V

OUT

ADJ connected to VOUT

1 mA < I

< 500 mA, VIN = (V

OUT

SENSE connected to VOUT, V

= 10 mA 20 mV

OUT

= 10 mA, TJ = −40°C to +125°C 40 mV

OUT

OUT

= 150 mA, TJ = −40°C to +125°C 175 mV

OUT

= 300 mA 200 mV

OUT

= 300 mA, TJ = −40°C to +125°C 325 mV

OUT

= 500 mA 350 mV

OUT

OUT

= 5 V 1000 µs

OUT

= 1 µF, TA = 25°C, unless otherwise noted.

OUT

= 20 V 0.3 µA

OUT

= 20 V, TJ = −40°C to

OUT

+ 1 V) to 20 V,

OUT

5 µA

–2 +1 %

1.21 1.22 1.23 V

+ 1 V) to 20 V,

OUT

+ 1 V) to 20 V,

OUT

+ 1 V) to 20 V,

OUT

= 1.5 V

OUT

1.196 1.232 V

10 nA

1 μA

°C
°C

Rev. B | Page 3 of 28

ADP7104 Data Sheet

10 kHz, VIN = 4.3 V, V

= 3.3 V

60 dB

Parameter Symbol Conditions Min Typ Max Unit

PROGRAMMABLE EN/UVLO

UVLO Threshold Rising UVLO
UVLO Threshold Falling UVLO

UVLO Hysteresis Current UVLO
Enable Pull-Down Current I
Start Threshold V
Shutdown Threshold V

Hysteresis 250 mV
OUTPUT NOISE OUT
10 Hz to 100 kHz, VIN = 6.3 V, V
10 Hz to 100 kHz, VIN = 8 V, V
10 Hz to 100 kHz, VIN = 12 V, V
10 Hz to 100 kHz, VIN = 5.5 V, V

10 Hz to 100 kHz, VIN = 12 V, V

10 Hz to 100 kHz, VIN = 20 V, V

POWER SUPPLY REJECTION RATIO PSRR 100 kHz, VIN = 4.3 V, V
100 kHz, VIN = 6 V, V

10 kHz, VIN = 6 V, V
100 kHz, VIN = 3.3 V, V
100 kHz, VIN = 6 V, V
100 kHz, VIN = 16 V, V
10 kHz, VIN = 3.3 V, V
10 kHz, VIN = 6 V, V
10 kHz, VIN = 16 V, V

1

Based on an end-point calculation using 1 mA and 300 mA loads. See Figure 6 for typical load regulation performance for loads less than 1 mA.

2

Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. This applies only for output

voltages above 3.0 V.

3

Start-up time is defined as the time between the rising edge of EN to VOUT being at 90% of its nominal value.

4

Current limit threshold is defined as the current at which the output voltage drops to 90% of the specified typical value. For example, the current limit for a 5.0 V

output voltage is defined as the current that causes the output voltage to drop to 90% of 5.0 V, or 4.5 V.

3.3 V ≤ VIN ≤ 20 V, TJ = −40°C to +125°C 1.18 1.23 1.28 V

RISE

3.3 V ≤ VIN ≤ 20 V, TJ = −40°C to +125°C, 10 kΩ in

FAL L

1.13 V

series with the enable pin

VEN > 1.25 V, TJ = −40°C to +125°C 7.5 9.8 12 µA

HYS

EN = VIN 500 nA

EN-IN

TJ = −40°C to +125°C 3.2 V

STA RT

TJ = −40°C to +125°C 2.45 V

SHUTDOWN

10 Hz to 100 kHz, VIN = 5.5 V, V

NOISE

= 1.8 V 15 µV rms

OUT

= 3.3 V 15 µV rms

OUT

= 5 V 15 µV rms

OUT

= 9 V 15 µV rms

OUT

= 1.5 V,

OUT

18 µV rms

adjustable mode

OUT

= 5 V,

30 µV rms

adjustable mode

= 15 V,

OUT

65 µV rms

adjustable mode

= 3.3 V 50 dB

OUT

= 5 V 50 dB

OUT

OUT

= 5 V 60 dB

OUT

= 1.8 V, adjustable mode 50 dB

OUT

= 5 V, adjustable mode 60 dB

OUT

= 15 V, adjustable mode 60 dB

OUT

= 1.8 V, adjustable mode 60 dB

OUT

= 5 V, adjustable mode 80 dB

OUT

= 15 V, adjustable mode 80 dB

OUT

INPUT AND OUTPUT CAPACITOR, RECOMMENDED SPECIFICATIONS

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

Minimum Input and Output Capacitance1 C
Capacitor ESR R

1

The minimum input and output capacitance should be greater than 0.7 μF over the full range of operating conditions. The full range of operating conditions in the

application must be considered during device selection to ensure that the minimum capacitance specification is met. X7R and X5R type capacitors are recommended;
Y5V and Z5U capacitors are not recommended for use with any LDO.

TA = −40°C to +125°C 0.7 µF

MIN

TA = −40°C to +125°C 0.001 0.2 Ω

ESR

Rev. B | Page 4 of 28

Data Sheet ADP7104

Operating Ambient Temperature Range

−40°C to +85°C

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

VIN to GND −0.3 V to +22 V
VOUT to GND −0.3 V to +20 V
EN/UVLO to GND −0.3 V to VIN
PG to GND −0.3 V to VIN
SENSE/ADJ to GND −0.3 V to VOUT
Storage Temperature Range −65°C to +150°C
Operating Junction Temperature Range −40°C to +125°C

Soldering Conditions JEDEC J-STD-020

Stresses above those listed under absolute maximum ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

THERMAL DATA

Absolute maximum ratings apply individually only, not in
combination. The ADP7104 can be damaged when the junction
temperature limit is exceeded. Monitoring ambient temperature
does not guarantee that T
limits. In applications with high power dissipation and poor
thermal resistance, the maximum ambient temperature may
have to be derated.

In applications with moderate power dissipation and low PCB
thermal resistance, the maximum ambient temperature can
exceed the maximum limit as long as the junction temperature
is within specification limits. The junction temperature (T
the device is dependent on the ambient temperature (T
power dissipation of the device (P
thermal resistance of the package (θ

Maximum junction temperature (T
ambient temperature (T
formula

T

= TA + (PD × θJA)

J

Junction-to-ambient thermal resistance (θ
based on modeling and calculation using a 4-layer board. The
junction-to-ambient thermal resistance is highly dependent on
the application and board layout. In applications where high
maximum power dissipation exists, close attention to thermal

is within the specified temperature

J

) of

J

), the

A

), and the junction-to-ambient

D

).

JA

) is calculated from the

J

) and power dissipation (PD) using the

A

) of the package is

JA

board design is required. The value of θ
on PCB material, layout, and environmental conditions. The
specified values of θ

are based on a 4-layer, 4 in. × 3 in. circuit

JA

board. See JESD51-7 and JESD51-9 for detailed information on
the board construction. For additional information, see the
AN-617 Application Note, MicroCSP™ Wafer Level Chip Scale
Package, available at www.analog.com.

Ψ

is the junction-to-board thermal characterization parameter

JB

with units of °C/W. The package’s Ψ
calculation using a 4-layer board. The JESD51-12, Guidelines for
Reporting and Using Electronic Package Thermal Information,
states that thermal characterization parameters are not the same
as thermal resistances. Ψ

measures the component power

JB

flowing through multiple thermal paths rather than a single
path as in thermal resistance, θ

. Therefore, ΨJB thermal paths

JB

include convection from the top of the package as well as
radiation from the package, factors that make Ψ
in real-world applications. Maximum junction temperature (T
is calculated from the board temperature (T
dissipation (P

T

= TB + (PD × ΨJB)

J

) using the formula

D

See JESD51-8 and JESD51-12 for more detailed information
about Ψ

.

JB

THERMAL RESISTANCE

θJA and ΨJB are specified for the worst-case conditions, that is, a
device soldered in a circuit board for surface-mount packages

is a parameter for surface-mount packages with top mounted
heatsinks.

θ

is presented here for reference only.

JC

Table 4. Thermal Resistance

Package Type

θJA θJC

8-Lead LFCSP 40.1 27.1 17.2 °C/W
8-Lead SOIC 48.5 58.4 31.3 °C/W

ESD CAUTION

may vary, depending

JA

is based on modeling and

JB

more useful

JB

) and power

B

. θJC

ΨJB Unit

)

J

Rev. B | Page 5 of 28

ADP7104 Data Sheet

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO
THIS PIN.

2. IT IS HIGHL Y RE COMMENDED THAT THE
EXPOSED PAD ON THE BOTTOM OF THE
PACKAGE BE CONNE CTED TO THE GROUND
PLANE ON T HE BOARD.

3GND
4NC

1VOUT
2SENSE/ADJ

6 GND
5 EN/UVLO

8 VIN
7 PG

ADP7104

TOP VIEW

(Not to S cale)

09507-003

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO
THIS PIN.

2. IT IS HIGHL Y RE COMMENDED THAT THE
EXPOSED PAD ON THE BOTTOM OF THE
PACKAGE BE CONNE CTED TO THE GROUND
PLANE ON T HE BOARD.

VOUT

1

SENSE/ADJ

2

GND

3

NC

4

VIN

8

PG

7

GND

6

EN/UVLO

5

ADP7104

TOP VIEW

(Not to S cale)

09507-004

Sense (SENSE). Measures the actual output voltage at the load and feeds it to the error amplifier.

performance and is electrically connected to GND inside the package. It is highly recommended

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

Figure 3. LFCSP Package

Figure 4. Narrow Body SOIC Package

Table 5. Pin Function Descriptions

Pin No. Mnemonic Description

1 VOUT Regulated Output Voltage. Bypass VOUT to GND with a 1 µF or greater capacitor.
2 SENSE/ADJ

Connect SENSE as close as possible to the load to minimize the effect of IR drop between the
regulator output and the load. This function applies to fixed voltages only.
Adjust Input (ADJ). An external resistor divider sets the output voltage. This function applies to

adjustable voltages only.
3 GND Ground.
4 NC Do Not Connect to this Pin.
5 EN/UVLO Enable Input (EN). Drive EN high to turn on the regulator; drive EN low to turn off the regulator.

For automatic startup, connect EN to VIN.

Programmable Undervoltage Lockout (UVLO). When the programmable UVLO function is used,

the upper and lower thresholds are determined by the programming resistors.
6 GND Ground.
7 PG Power Good. This open-drain output requires an external pull-up resistor to VIN or VOUT. If the

part is in shutdown, current limit, thermal shutdown, or falls below 90% of the nominal output

voltage, PG immediately transitions low. If the power-good function is not used, the pin may be

left open or connected to ground.
8 VIN Regulator Input Supply. Bypass VIN to GND with a 1 µF or greater capacitor.
EPAD Exposed Pad. Exposed paddle on the bottom of the package. The EPAD enhances thermal

that the EPAD be connected to the ground plane on the board.

Rev. B | Page 6 of 28

Data Sheet ADP7104

3.25

3.27

3.29

3.31

3.33

3.35

V

OUT

(V)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

–40°C –5°C 25°C 85°C 125°C

TJ (°C)

09507-005

3.25

3.27

3.29

3.31

3.33

3.35

0.1 1 10 100 1000

V

OUT

(V)

I

LOAD

(mA)

09507-006

3.25

3.27

3.29

3.31

3.33

3.35

4 6 8 10 12 14 16 18 20

V

OUT

(V)

VIN (V)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

09507-007

0

200

400

600

800

1000

1200

GROUND CURRENT (µA)

–40°C –5°C 25°C 85°C 125°C

T

J

(

°C

)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

09507-008

0

100

200

300

400

500

600

700

800

0.1 1 10 100 1000

I

LOAD

(mA)

GROUND CURRENT (µA)

09507-009

0

200

400

600

800

1000

1200

4 6 8 10 12 14 16 18 20

GROUND CURRENT (µA)

VIN (V)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

09507-010

TYPICAL PERFORMANCE CHARACTERISTICS

VIN = 7.5 V, V

OUT

= 5 V, I

= 10 mA, CIN = C

OUT

= 1 µF, TA = 25°C, unless otherwise noted.

OUT

Figure 5. Output Voltage vs. Junction Temperature

Figure 6. Output Voltage vs. Load Current

Figure 8. Ground Current vs. Junction Temperature

Figure 9. Ground Current vs. Load Current

Figure 7. Output Voltage vs. Input Voltage

Figure 10. Ground Current vs. Input Voltage

Rev. B | Page 7 of 28

ADP7104 Data Sheet

SHUTDOWN CURRE NT (µA)

0

20

40

60

80

100

120

140

160

–50 –25 0 25 50 75 100 125

TEMPERATURE (°C)

3.3V

4.0V

6.0V

8.0V

12.0V

20.0V

09507-011

0

50

100

150

200

250

300

350

1 10 100 1000

DROPOUT ( mV )

I

LOAD

(mA)

V

OUT

= 3.3V

T

A

= 25°C

09507-012

2.7

2.8

2.9

3.0

3.1

3.2

3.3

3.4

3.1 3.2 3.3 3.4 3.5 3.6 3.7

V

OUT

(V)

VIN (V)

LOAD = 5mA
LOAD = 10mA
LOAD = 100mA
LOAD = 200mA
LOAD = 300mA
LOAD = 500mA

09507-013

0

200

400

600

800

1000

1200

1400

3.1 3.2 3.3 3.4 3.5 3.6 3.7

GROUND CURRENT (µA)

V

IN

(V)

LOAD = 5mA
LOAD = 10mA
LOAD = 100mA
LOAD = 200mA
LOAD = 300mA
LOAD = 500mA

09507-014

4.95

4.96

4.97

4.98

4.99

5.00

5.01

5.02

5.03

5.04

5.05

V

OUT

(V)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

–40°C –5°C 25°C 85°C 125°C

T

J

(

°C

)

09507-015

4.95

4.96

4.97

4.98

4.99

5.00

5.01

5.02

5.03

5.04

5.05

0.1 1 10 100 1000

V

OUT

(V)

I

LOAD

(mA)

09507-016

Figure 11. Shutdown Current vs. Temperature at Various Input Voltages

Figure 12. Dropout Voltage vs. Load Current

Figure 14. Ground Current vs. Input Voltage (in Dropout)

Figure 15. Output Voltage vs. Junction Temperature, V

OUT

= 5 V

Figure 13. Output Voltage vs. Input Voltage (in Dropout)

Figure 16. Output Voltage vs. Load Current, V

OUT

= 5 V

Rev. B | Page 8 of 28

Data Sheet ADP7104

4.95

4.96

4.97

4.98

4.99

5.00

5.01

5.02

5.03

5.04

5.05

6 8 10 12 14 16 18 20

V

OUT

(V)

V

IN

(V)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

09507-017

0

100

200

300

400

500

600

700

800

900

1000

25°C 85°C 125°C

GROUND CURRENT (µA)

TJ (°C)

–40°C –5°C

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA

09507-118

0

100

200

300

400

500

600

700

0.1 1 10 100 1000

GROUND CURRENT (µA)

I

LOAD

(mA)

09507-119

0

50

100

150

200

250

300

1 10 100 1000

DROPOUT ( mV )

I

LOAD

(mA)

V

OUT

= 5V

T

A

= 25°C

09507-018

4.55

4.60

4.65

4.70

4.75

4.80

4.85

4.90

4.95

5.00

5.05

4.8 4.9 5.0 5.1 5.2 5.3 5.4

V

OUT

(V)

VIN (V)

LOAD = 5mA
LOAD = 10mA
LOAD = 100mA
LOAD = 200mA
LOAD = 300mA
LOAD = 500mA

09507-019

–500

0

500

1000

1500

2000

2500

4.80 4.90 5.00 5.10 5.20 5.30 5.40

GROUND CURRENT (µA)

VIN (V)

LOAD = 5mA
LOAD = 10mA
LOAD = 100mA
LOAD = 200mA
LOAD = 300mA
LOAD = 500mA

09507-020

Figure 17. Output Voltage vs. Input Voltage, V

OUT

Figure 18. Ground Current vs. Junction Temperature, V

= 5 V

OUT

= 5 V

Figure 20. Dropout Voltage vs. Load Current, V

OUT

= 5 V

Figure 21. Output Voltage vs. Input Voltage (in Dropout)

Figure 19. Ground Current vs. Load Current, V

OUT

= 5 V

Figure 22. Ground Current vs. Input Voltage (in Dropout), V

OUT

= 5 V

Rev. B | Page 9 of 28

ADP7104 Data Sheet

1.75

1.77

1.79

1.81

1.83

1.85

V

OUT

(V)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

–40°C –5°C 25°C 85°C 125°C

T

J

(

°C

)

09507-021

V

OUT

(V)

1.75

1.77

1.79

1.81

1.83

1.85

0.1 1 10 100 1000

I

LOAD

(mA)

09507-022

1.75

1.77

1.79

1.81

1.83

1.85

2 4 6 8 10 12

14 16 18 20

V

OUT

(V)

VIN (V)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

09507-023

0

100

200

300

400

500

600

700

800

900

25°C 85°C 125°C

GROUND CURRENT (µA)

T

J

(°C)

–40°C –5°C

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA

09507-126

0

100

200

300

400

500

600

700

0.1 1 10 100 1000

GROUND CURRENT (µA)

I

LOAD

(mA)

09507-127

0

200

400

600

800

1000

1200

2 4 6 8 10 12 14 16 18 20

GROUND CURRENT (µA)

VIN (V)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

09507-024

Figure 23. Output Voltage vs. Junction Temperature, V

Figure 24. Output Voltage vs. Load Current, V

OUT

= 1.8 V

OUT

= 1.8 V

Figure 26. Ground Current vs. Junction Temperature, V

OUT

Figure 27. Ground Current vs. Load Current, V

OUT

= 1.8 V

= 1.8 V

Figure 25. Output Voltage vs. Input Voltage, V

OUT

= 1.8 V

Rev. B | Page 10 of 28

Figure 28. Ground Current vs. Input Voltage, V

OUT

= 1.8 V

Data Sheet ADP7104

4.98

4.99

5.00

5.01

5.02

5.03

5.04

5.05

5.06

5.07

5.08

V

OUT

(V)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

–40°C –5°C 25°C 85°C 125°C

TJ (°C)

09507-025

4.98

4.99

5.00

5.01

5.02

5.03

5.04

5.05

5.06

5.07

5.08

0.1 1 10 100 1000

V

OUT

(V)

I

LOAD

(mA)

09507-026

4.98

4.99

5.00

5.01

5.02

5.03

5.04

5.05

5.06

5.07

5.08

6 8 10 12 14 16 18 20

V

OUT

(V)

VIN (V)

LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 100mA
LOAD = 300mA
LOAD = 500mA

09507-027

0

0.5

1.0

1.5

2.0

–40 –20 0 20 40 60 80 100 120 140

I

OUT

SHUTDOWN CURRE NT (µA)

TEMPERATURE (°C)

3.3V
4V
5V
6V
8V
10V
12V
15V
18V
20V

09507-054

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

10 100 1k 10k 100k 1M 10M

PSRR (dB)

FREQUENCY (Hz)

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

09507-028

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

10 100 1k 10k 100k 1M 10M

PSRR (dB)

FREQUENCY (Hz)

09507-029

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

Figure 29. Output Voltage vs. Junction Temperature, V

Figure 30. Output Voltage vs. Load Current, V

OUT

= 5 V, Adjustable

OUT

= 5 V, Adjustable

Figure 32. Reverse Input Current vs. Temperature, V

Voltages on V

OUT

= 0 V, Different

IN

Figure 33. Power Supply Rejection Rati o vs. Frequency, V

= 1.8 V, VIN = 3.3 V

OUT

Figure 31. Output Voltage vs. Input Voltage, V

= 5 V, Adjustable

OUT

Figure 34. Power Supply Rejection Ratio vs. Frequency, V

Rev. B | Page 11 of 28

= 3.3 V, VIN = 4.8 V

OUT

ADP7104 Data Sheet

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

10 100 1k 10k 100k 1M 10M

PSRR (dB)

FREQUENCY (Hz)

09507-030

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

10 100 1k 10k 100k 1M 10M

PSRR (dB)

FREQUENCY (Hz)

09507-031

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

PSRR (dB)

FREQUENCY (Hz)

10 100 1k 10k 100k 1M 10M

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

09507-032

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

PSRR (dB)

FREQUENCY (Hz)

10 100 1k 10k 100k 1M 10M

09507-033

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

PSRR (dB)

10 100 1k 10k 100k 1M 10M

FREQUENCY (Hz)

09507-034

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

PSRR (dB)

10 100 1k 10k 100k 1M 10M

FREQUENCY (Hz)

09507-035

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

Figure 35. Power Supply Rejection Ratio vs. Frequency, V

Figure 36. Power Supply Rejection Ratio vs. Frequency, V

= 3.3 V, VIN = 4.3 V

OUT

= 3.3 V, VIN = 3.8 V

OUT

Figure 38. Power Supply Rejection Ratio vs. Frequency, V

= 5 V, VIN = 6 V

OUT

Figure 39. Power Supply Rejection Ratio vs. Frequency, V

= 5 V, VIN = 5.5 V

OUT

Figure 37. Power Supply Rejection Ratio vs. Frequency, V

= 5 V, VIN = 6.5 V

OUT

Figure 40. Power Supply Rejection Ratio vs. Frequency, V

Rev. B | Page 12 of 28

= 5 V, VIN = 5.3 V

OUT

Data Sheet ADP7104

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

PSRR (dB)

10 100 1k 10k 100k 1M 10M

FREQUENCY (Hz)

09507-036

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

PSRR (dB)

10 100 1k 10k 100k 1M 10M

FREQUENCY (Hz)

09507-037

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

PSRR (dB)

10 100 1k 10k 100k 1M 10M

FREQUENCY (Hz)

09507-038

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

0 0.25 0.50 0.75 1.00 1.25 1.50

PSRR (dB)

HEADROOM VOLTAGE (V)

09507-039

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

0 0.25 0.50 0.75 1.00 1.25 1.50

PSRR (dB)

HEADROOM VOLTAGE (V)

09507-040

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

0 0.25 0.50 0.75 1.00 1.25 1.50

PSRR (dB)

HEADROOM VOLTAGE (V)

09507-041

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

Figure 41. Power Supply Rejection Ratio vs. Frequency, V

Figure 42. Power Supply Rejection Ratio vs. Frequency, V

Adjustable

= 5 V, VIN = 5.2 V

OUT

= 5 V, VIN = 6 V

OUT

Figure 44. Power Supply Rejection Ratio vs. Headroom Voltage, 100 Hz,

= 5 V

V

OUT

Figure 45. Power Supply Rejection Ratio vs. Headroom Voltage, 1 kHz,

V

= 5 V

OUT

Figure 43. Power Supply Rejection Ratio vs. Frequency, V

Adjustable With Noise Reduction Circuit

= 5 V, VIN = 6 V

OUT

Rev. B | Page 13 of 28

Figure 46. Power Supply Rejection Ratio vs. Headroom Voltage, 10 kHz,

V

= 5 V

OUT

ADP7104 Data Sheet

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

0 0.25 0.50 0.75 1.00 1.25 1.50

PSRR (dB)

HEADROOM VOLTAGE (V)

LOAD = 500mA
LOAD = 300mA
LOAD = 100mA
LOAD = 10mA
LOAD = 1mA

09507-042

5

0

10

15

20

25

30

0.010.0010.00010.00001 0.1 1

NOISE (µV rms)

LOAD CURRENT ( A)

3.3V

1.8V
5V
5V

ADJ

5V

ADJ

NR

09507-043

FREQUENCY (Hz)

0.01

0.1

1

10

10 100 1k 10k 100k

NOISE (µV/√Hz)

3.3V
5V
5V

ADJ

5V

ADJ

NR

09507-044

CH2 50mVCH1 500mA M 20µs A CH1 270mA

1

2

T 10%

Ω

LOAD CURRENT

OUTPUT VOLTAGE

09507-045

B

W

B

W

CH2 50mVCH1 500mA M 20µs A CH1 280mA

1

2

T 10.2%

Ω

LOAD CURRENT

OUTPUT VOLTAGE

09507-046

B

W

B

W

CH2 50mVCH1 500mA M 20µs A CH1 300mA

1

2

T 10.2%

Ω

LOAD CURRENT

OUTPUT VOLTAGE

09507-047

B

W

B

W

Figure 47. Power Supply Rejection Ratio vs. Headroom Voltage, 100 kHz,

V

= 5 V

OUT

Figure 48. Output Noise vs. Load Current and Output Voltage,

C

= 1 μF

OUT

Figure 50. Load Transient Response, C

V

= 1.8 V, VIN = 5 V

OUT

= 1 μF, I

IN

OUT

= 1 mA to 500 mA,

LOAD

, C

, C

Figure 51. Load Transient Response, C

V

= 3.3 V, VIN = 5 V

OUT

= 1 μF, I

IN

OUT

= 1 mA to 500 mA,

LOAD

Figure 49. Output Noise Spectral Density, I

LOAD

= 10 mA, C

OUT

= 1 μF

Figure 52. Load Transient Response, C

V

OUT

, C

= 1 μF, I

IN

OUT

= 5 V, VIN = 7 V

= 1 mA to 500 mA,

LOAD

Rev. B | Page 14 of 28

Data Sheet ADP7104

CH2 10mVCH1 1V M 4µs A CH4 1.56V

1

2

T 9.8%

LOAD CURRENT

OUTPUT VOLTAGE

09507-048

B

W

B

W

CH2 10mVCH1 1V M 4µs A CH4 1.56V

1

2

T 9.8%

LOAD CURRENT

OUTPUT VOLTAGE

09507-049

B

W

B

W

CH2 10mVCH1 1V M 4µs A CH4 1.56V

1

2

T 9.8%

LOAD CURRENT

OUTPUT VOLTAGE

09507-050

B

W

B

W

1

2

LOAD CURRENT

OUTPUT VOLTAGE

09507-051

CH2 10mVCH1 1V M 4µs A CH4 1.56V

T 9.8%

B

W

B

W

1

2

LOAD CURRENT

OUTPUT VOLTAGE

09507-052

CH2 10mVCH1 1V M 4µs A CH4 1.56V

T 9.8%

B

W

B

W

CH2 10mVCH1 1V M 4µs A CH4 1.56V

1

2

T 9.8%

LOAD CURRENT

OUTPUT VOLTAGE

09507-053

B

W

B

W

Figure 53. Line Transient Response, C

V

= 1.8 V

OUT

Figure 54. Line Transient Response, C

V

= 3.3 V

OUT

= 1 mA,

OUT

= 3.3 V

, C

= 1 μF, I

IN

OUT

= 500 mA,

LOAD

Figure 56. Line Transient Response, C

V

= 1.8 V

OUT

, C

= 1 μF, I

IN

OUT

LOAD

, C

= 1 μF, I

IN

OUT

= 500 mA,

LOAD

Figure 57. Line Transient Response, C

, C

= 1 μF, I

IN

OUT

= 1 mA, V

LOAD

Figure 55. Line Transient Response, C

V

OUT

= 5 V

, C

= 1 μF, I

IN

OUT

= 500 mA,

LOAD

Figure 58. Line Transient Response, C

V

OUT

= 5 V

, C

= 1 μF, I

IN

OUT

LOAD

= 1 mA,

Rev. B | Page 15 of 28

ADP7104 Data Sheet

SHUTDOWN

VIN

GND

EN/

UVLO

VOUT

R1

R2

1.22V

REFERENCE

VREG

PGOOD

PG

SENSE

SHORT-CIRCUIT,

THERMAL
PROTECT

10µA

09507-055

SHUTDOWN

VIN

GND

EN/

UVLO

VOUT

R2

1.22V

REFERENCE

VREG

PGOOD

PG

ADJ

SHORT-CIRCUIT,

THERMAL

PROTECT

10µA

09507-056

V

OUT

= 5V

V

IN

= 8V

PG

VOUTVIN

PG

GND

ADJ

EN/
UVLO

RPG

100kΩ

R4

100kΩ

R3

100kΩ

COUT
1µF

CIN
1µF

ON

OFF

R2

13kΩ

++

R1

40.2kΩ

09507-075

THEORY OF OPERATION

The ADP7104 is a low quiescent current, low-dropout linear
regulator that operates from 3.3 V to 20 V and provides up to
500 mA of output current. Drawing a low 1 mA of quiescent
current (typical) at full load makes the ADP7104 ideal for
battery-operated portable equipment. Typi c a l shutdown
current consumption is 40 μA at room temperature.

Optimized for use with small 1 µF ceramic capacitors, the

ADP7104 provides excellent transient performance.

is higher than the reference voltage, the gate of the PMOS
device is pulled higher, allowing less current to pass and
decreasing the output voltage.

The ADP7104 is available in seven fixed output voltage options,
ranging from 1.5 V to 9 V and in an adjustable version with an
output voltage that can be set to between 1.22 V and 19 V by an
external voltage divider. The output voltage can be set according
to the following equation:

V

= 1.22 V(1 + R1/R2)

OUT

Figure 59. Fixed Output Voltage Internal Block Diagram

Figure 60. Adjustable Output Voltage Internal Block Diagram

Internally, the ADP7104 consists of a reference, an error
amplifier, a feedback voltage divider, and a PMOS pass
transistor. Output current is delivered via the PMOS pass
device, which is controlled by the error amplifier. The error
amplifier compares the reference voltage with the feedback
voltage from the output and amplifies the difference. If the
feedback voltage is lower than the reference voltage, the gate
of the PMOS device is pulled lower, allowing more current to
pass and increasing the output voltage. If the feedback voltage

Figure 61. Typical Adjustable Output Voltage Application Schematic

The value of R2 should be less than 200 kΩ to minimize errors
in the output voltage caused by the ADJ pin input current. For
example, when R1 and R2 each equal 200 kΩ, the output voltage
is 2.44 V. The output voltage error introduced by the ADJ pin input
current is 2 mV or 0.08%, assuming a typical ADJ pin input
current of 10 nA at 25°C.

The ADP7104 uses the EN/UVLO pin to enable and disable
the VOUT pin under normal operating conditions. When
EN/UVLO is high, VOUT turns on, when EN is low, VOUT
turns off. For automatic startup, EN/UVLO can be tied to VIN.

The ADP7104 incorporates reverse current protections
circuitry that prevents current flow backwards through the pass
element when the output voltage is greater than the input
voltage. A comparator senses the difference between the input
and output voltages. When the difference between the input
voltage and output voltage exceeds 55 mV, the body of the PFET
is switched to V

and turned off or opened. In other words,

OUT

the gate is connected to VOUT.

Rev. B | Page 16 of 28

Data Sheet ADP7104

CH2 50mVCH1 500mA M 20µs A CH1 270mA

1

2

T 10%

Ω

LOAD CURRENT

OUTPUT VOLTAGE

09507-057

1.2

1.0

0.8

0.6

0.4

0.2

0

0 2 4 6 8 10

CAPACITANCE (µF)

VOLTAGE (V)

09507-058

APPLICATIONS INFORMATION

CAPACITOR SELECTION

Output Capacitor

The ADP7104 is designed for operation with small, space-saving
ceramic capacitors but functions with most commonly used
capacitors as long as care is taken with regard to the effective series
resistance (ESR) value. The ESR of the output capacitor affects the
stability of the LDO control loop. A minimum of 1 µF capacitance
with an ESR of 1 Ω or less is recommended to ensure the stability
of the ADP7104. Transient response to changes in load current is
also affected by output capacitance. Using a larger value of output
capacitance improves the transient response of the ADP7104 to
large changes in load current. Figure 62 shows the transient
responses for an output capacitance value of 1 µ F.

Figure 63 depicts the capacitance vs. voltage bias characteristic
of an 0402, 1 µF, 10 V, X5R capacitor. The voltage stability of a
capacitor is strongly influenced by the capacitor size and voltage
rating. In general, a capacitor in a larger package or higher voltage
rating exhibits better stability. The temperature variation of the
X5R dielectric is ~±15% over the −40°C to +85°C temperature
range and is not a function of package or voltage rating.

Figure 63. Capacitance vs. Voltage Characteristic

Use Equation 1 to determine the worst-case capacitance accounting
for capacitor variation over temperature, component tolerance,
and voltage.

C

= C

EFF

Figure 62. Output Transient Response, V

= 1.8 V, C

OUT

OUT

= 1 µF

Input Bypass Capacitor

Connecting a 1 µF capacitor from VIN to GND reduces
the circuit sensitivity to printed circuit board (PCB) layout,
especially when long input traces or high source impedance
are encountered. If greater than 1 µF of output capacitance is
required, the input capacitor should be increased to match it.

Input and Output Capacitor Properties

Any good quality ceramic capacitors can be used with the

ADP7104, as long as they meet the minimum capacitance and

maximum ESR requirements. Ceramic capacitors are manufac­tured with a variety of dielectrics, each with different behavior
over temperature and applied voltage. Capacitors must have a
dielectric adequate to ensure the minimum capacitance over
the necessary temperature range and dc bias conditions. X5R
or X7R dielectrics with a voltage rating of 6.3 V to 25 V are
recommended. Y5V and Z5U dielectrics are not recommended,
due to their poor temperature and dc bias characteristics.

where:
C

is the effective capacitance at the operating voltage.

BIAS

TEMPCO is the worst-case capacitor temperature coefficient.
TOL is the worst-case component tolerance.

In this example, the worst-case temperature coefficient (TEMPCO)
over −40°C to +85°C is assumed to be 15% for an X5R dielectric.
The tolerance of the capacitor (TOL) is assumed to be 10%, and
C

is 0.94 μF at 1.8 V, as shown in Figure 63.

BIAS

Substituting these values in Equation 1 yields

C

EFF

Therefore, the capacitor chosen in this example meets the
minimum capacitance requirement of the LDO overtemper­ature and tolerance at the chosen output voltage.

To guarantee the performance of the ADP7104, it is imperative
that the effects of dc bias, temperature, and tolerances on the
behavior of the capacitors be evaluated for each application.

× (1 − TEMPCO) × (1 − TOL) (1)

BIAS

= 0.94 μF × (1 − 0.15) × (1 − 0.1) = 0.719 μF

Rev. B | Page 17 of 28

ADP7104 Data Sheet

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.001.00

0

V

OUT

, EN RISE

V

OUT

, EN FALL

09507-060

V

OUT

= 5V

V

IN

= 8V

PG

VOUTVIN

PG

GND

SENSE

EN/
UVLO

100kΩ

100kΩ

100kΩ

COUT
1µF

CIN
1µF

ON

OFF

+

+

09507-059

TIME (µs)

0 500 1000 1500 2000

6

4

5

3

2

1

0

V

OUT

(V)

5V

3.3V

ENABLE

09507-061

PROGRAMABLE UNDERVOLTAGE LOCKOUT (UVLO)

The ADP7104 uses the EN/UVLO pin to enable and disable
the VOUT pin under normal operating conditions. As shown
in Figure 64, when a rising voltage on EN crosses the upper
threshold, VOUT turns on. When a falling voltage on EN/
UVLO crosses the lower threshold, VOUT turns off. The
hysteresis of the EN/UVLO threshold is determined by
the Thevenin equivalent resistance in series with the EN/
UVLO pin.

Hysteresis can also be achieved by connecting a resistor in
series with EN/UVLO pin. For the example shown in Figure 65,
the enable threshold is 2.44 V with a hysteresis of 1 V.

Figure 64. Typical VOUT Response to EN Pin Operation

The upper and lower thresholds are user programmable and can
be set using two resistors. When the EN/UVLO pin voltage is
below 1.22 V, the LDO is disabled. When the EN/UVLO pin
voltage transitions above 1.22 V, the LDO is enabled and 10 µA
hysteresis current is sourced out the pin raising the voltage, thus
providing threshold hysteresis. Typically, two external resistors
program the minimum operational voltage for the LDO. The
resistance values, R1 and R2 can be determined from:

R1 = V

R2 = 1.22 V × R1/(V

/10 μA

HYS

− 1.22 V)

IN

where:

V

is the desired turn-on voltage.

IN

V

is the desired EN/UVLO hysteresis level.

HYS

Figure 65. Typical EN Pin Voltage Divid er

Figure 64 shows the typical hysteresis of the EN/UVLO pin.
This prevents on/off oscillations that can occur due to noise
on the EN pin as it passes through the threshold points.

The ADP7104 uses an internal soft-start to limit the inrush
current when the output is enabled. The start-up time for the

3.3 V option is approximately 580 μs from the time the EN
active threshold is crossed to when the output reaches 90%
of its final value. As shown in Figure 66, the start-up time is
dependent on the output voltage setting.

Figure 66. Typical Start-Up Behavior

Rev. B | Page 18 of 28

Data Sheet ADP7104

0

1

2

3

4

5

6

4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0

PG (V)

V

OUT

(V)

PG –40°C
PG –5°C
PG +25°C
PG +85°C
PG +125°C

09507-062

0

1

2

3

4

5

6

4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0

PG (V)

V

OUT

(V)

PG –40°C
PG –5°C
PG +25°C
PG +85°C
PG +125°C

09507-063

V

OUT

= 5V

VIN = 8V

PG

VOUTVIN

PG

GND

ADJ

EN/
UVLO

100kΩ

100kΩ

100kΩ

COUT
1µF

CIN

1µF

ON

OFF

R

NR

13kΩ

R

FB2

13kΩ

+

+

R

FB1

40.2kΩ

C

NR

100nF

+

09507-064

POWER-GOOD FEATURE

The ADP7104 provides a power-good pin (PG) to indicate
the status of the output. This open-drain output requires an
external pull-up resistor to VIN. If the part is in shutdown
mode, current-limit mode, or thermal shutdown, or if it falls
below 90% of the nominal output voltage, the power-good pin
(PG) immediately transitions low. During soft-start, the rising
threshold of the power-good signal is 93.5% of the nominal
output voltage.

The open-drain output is held low when the ADP7104 has suffi­cient input voltage to turn on the internal PG transistor. The PG
transistor is terminated via a pull-up resistor to VOUT or VIN.

Power-good accuracy is 93.5% of the nominal regulator output
voltage when this voltage is rising, with a 90% trip point when
this voltage is falling. Regulator input voltage brownouts or
glitches trigger power no good signals if V

A normal power-down causes the power-good signal to go low
when V

drops below 90%.

OUT

Figure 67 and Figure 68 show the typical power-good rising and
falling threshold over temperature.

falls below 90%.

OUT

NOISE REDUCTION OF THE ADJUSTABLE ADP7104

The ultralow output noise of the fixed output ADP7104 is
achieved by keeping the LDO error amplifier in unity gain
and setting the reference voltage equal to the output voltage.
This architecture does not work for an adjustable output
voltage LDO. The adjustable output ADP7104 uses the more
conventional architecture where the reference voltage is fixed
and the error amplifier gain is a function of the output voltage.
The disadvantage of the conventional LDO architecture is that
the output voltage noise is proportional to the output voltage.

The adjustable LDO circuit may be modified slightly to reduce
the output voltage noise to levels close to that of the fixed
output ADP7104. The circuit shown in Figure 69 adds two
additional components to the output voltage setting resistor
divider. C
the ac gain of the error amplifier. R
R

FB2

mately 6 dB. The actual gain is the parallel combination of R
and R
always operates at greater than unity gain.

C

is chosen by setting the reactance of CNR equal to R

NR

R

at a frequency between 50 Hz and 100 Hz. This sets the

NR

frequency where the ac gain of the error amplifier is 3 dB
down from its dc gain.

and RNR are added in parallel with R

NR

is chosen to be equal to

NR

to reduce

FB1

, this limits the ac gain of the error amplifier to approxi-

divided by R

FB1

. This ensures that the error amplifier

FB2

FB1

−

NR

Figure 67. Typical Power-Good Threshold vs. Temperature, V

Figure 68. Typical Power-Good Threshold vs. Temperature, V

Figure 69. Noise Reduction Modification to Adjustable LDO

The noise of the LDO is approximately the noise of the fixed
output LDO (typically 15 µV rms) times the square root of the
parallel combination of R

and R

NR

divided by R

FB1

. Based on

FB2

OUT

Rising

the component values shown in Figure 69, the ADP7104 has the
following characteristics:

• DC gain of 4.09 (12.2 dB)

• 3 dB roll off frequency of 59 Hz

• High frequency ac gain of 1.82 (5.19 dB)

• Noise reduction factor of 1.35 (2.59 dB)

• RMS noise of the adjustable LDO without noise reduction

of 27.8 µV rms

• RMS noise of the adjustable LDO with noise reduc-

tion (assuming 15 µV rms for fixed voltage option) of

20.25 µV rms

Falling

OUT

Rev. B | Page 19 of 28

ADP7104 Data Sheet

CURRENT LIMIT AND THERMAL OVERLOAD PROTECTION

The ADP7104 is protected against damage due to excessive
power dissipation by current and thermal overload protection
circuits. The ADP7104 is designed to current limit when the
output load reaches 600 mA (typical). When the output load
exceeds 600 mA, the output voltage is reduced to maintain a
constant current limit.

Thermal overload protection is included, which limits the
junction temperature to a maximum of 150°C (typical). Under
extreme conditions (that is, high ambient temperature and/or
high power dissipation) when the junction temperature starts to
rise above 150°C, the output is turned off, reducing the output
current to zero. When the junction temperature drops below
135°C, the output is turned on again, and output current is
restored to its operating value.

Consider the case where a hard short from VOUT to ground
occurs. At first, the ADP7104 current limits, so that only 600 mA
is conducted into the short. If self heating of the junction is
great enough to cause its temperature to rise above 150°C,
thermal shutdown activates, turning off the output and reducing
the output current to zero. As the junction temperature cools
and drops below 135°C, the output turns on and conducts
600 mA into the short, again causing the junction temperature
to rise above 150°C. This thermal oscillation between 135°C
and 150°C causes a current oscillation between 600 mA and
0 mA that continues as long as the short remains at the output.

Current and thermal limit protections are intended to protect
the device against accidental overload conditions. For reliable
operation, device power dissipation must be externally limited
so the junction temperature does not exceed 125°C.

THERMAL CONSIDERATIONS

In applications with low input-to-output voltage differential, the

ADP7104 does not dissipate much heat. However, in applications

with high ambient temperature and/or high input voltage, the
heat dissipated in the package may become large enough that
it causes the junction temperature of the die to exceed the
maximum junction temperature of 125°C.

When the junction temperature exceeds 150°C, the converter
enters thermal shutdown. It recovers only after the junction
temperature has decreased below 135°C to prevent any permanent
damage. Therefore, thermal analysis for the chosen application
is very important to guarantee reliable performance over all
conditions. The junction temperature of the die is the sum of
the ambient temperature of the environment and the tempera­ture rise of the package due to the power dissipation, as shown
in Equation 2.

To guarantee reliable operation, the junction temperature of
the ADP7104 must not exceed 125°C. To ensure that the
junction temperature stays below this maximum value, the
user must be aware of the parameters that contribute to
junction temperature changes. These parameters include
ambient temperature, power dissipation in the power device,
and thermal resistances between the junction and ambient air
(θ

). The θJA number is dependent on the package assembly

JA

compounds that are used and the amount of copper used to
solder the package GND pins to the PCB.

Table 6 shows typical θ

values of the 8-lead SOIC and 8-lead

JA

LFCSP packages for various PCB copper sizes. Ta bl e 7 shows
the typical Ψ

Table 6. Typical θ

Copper Size (mm2)

values of the 8-lead SOIC and 8-l e a d LF C S P.

JB

Values

JA

θ

(°C/W)

JA

LFCSP SOIC

251 165.1 167.8
100 125.8 111
500 68.1 65.9
1000 56.4 56.1
6400 42.1 45.8

1

Device soldered to minimum size pin traces.

Table 7. Typical ΨJB Values

Model ΨJB (°C/W)

LFCSP 15.1
SOIC 31.3

The junction temperature of the ADP7104 is calculated from
the following equation:

T

= TA + (PD × θJA) (2)

J

where:

T

is the ambient temperature.

A

P

is the power dissipation in the die, given by

D

= [(VIN − V

P

D

OUT

) × I

] + (VIN × I

LOAD

) (3)

GND

where:

I

is the load current.

LOAD

I

is the ground current.

GND

V

and V

IN

are input and output voltages, respectively.

OUT

Power dissipation due to ground current is quite small and can
be ignored. Therefore, the junction temperature equation
simplifies to the following:

T

= TA + {[(VIN − V

J

OUT

) × I

] × θJA} (4)

LOAD

As shown in Equation 4, for a given ambient temperature, input­to-output voltage differential, and continuous load current,
there exists a minimum copper size requirement for the PCB
to ensure that the junction temperature does not rise above 125°C.
Figure 70 to Figure 77 show junction temperature calculations
for different ambient temperatures, power dissipation, and areas
of PCB copper.

Rev. B | Page 20 of 28

Data Sheet ADP7104

25

35

45

55

65

75

85

95

105

115

125

135

145

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4

JUNCTION T E M P E R ATURE (°C)

TOTAL POWER DISSIPATION (W)

6400mm

2

500mm

2

25mm

2

TJMAX

09507-065

JUNCTION T E M P E R ATURE (°C)

50

60

70

80

90

100

110

120

130

140

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

TOTAL POWER DISSIPATION (W)

6400mm

2

500mm

2

25mm

2

TJMAX

09507-066

JUNCTION T E M P E R ATURE (°C)

65

75

85

95

105

115

125

135

145

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

TOTAL POWER DISSIPATION (W)

6400mm

2

500mm

2

25mm

2

T

J

MAX

09507-067

25

35

45

55

65

75

85

95

105

115

125

135

145

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4

TOTAL POWER DISSIPATION (W)

JUNCTION T E M P E R ATURE (°C)

6400mm

2

500mm

2

25mm

2

TJMAX

09507-068

50

60

70

80

90

100

110

120

130

140

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

TOTAL POWER DISSIPA

TION (W)

JUNCTION T E M P E R ATURE (°C)

6400mm

2

500mm

2

25mm

2

T

J

MAX

09507-069

65

75

85

95

105

115

125

135

145

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

TOTAL POWER DISSIPATION (W)

JUNCTION T E M P E R ATURE (°C)

6400mm

2

500mm

2

25mm

2

TJMAX

09507-070

Figure 70. LFCSP, T

= 25°C

A

Figure 71. LFCSP, TA = 50°C

Figure 73. SOIC, T

= 25°C

A

Figure 74. SOIC, TA = 50°C

Figure 72. LFCSP, T

= 85°C

A

Figure 75. SOIC, T

= 85°C

A

Rev. B | Page 21 of 28

ADP7104 Data Sheet

TOTAL POWER DISSIPATION (W)

JUNCTION T E M P E R ATURE (T

J

)

0

20

40

60

80

100

120

140

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0

TB = 25°C
T

B

= 50°C

T

B

= 65°C
TB = 85°C
T

J

MAX

09506-071

TOTAL POWER DISSIPATION (W)

JUNCTION T E M P E R ATURE (T

J

)

0

20

40

60

80

100

120

140

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5

TB = 25°C
TB = 50°C
T

B

= 65°C

T

B

= 85°C

TJMAX

09507-072

In the case where the board temperature is known, use the
thermal characterization parameter, Ψ
junction temperature rise (see Figure 76 and Figure 77).
Maximum junction temperature (T
the board temperature (T

) and power dissipation (PD)

B

using the following formula:

T

= TB + (PD × ΨJB) (5)

J

The typical value of Ψ

is 15.1°C/W for the 8-lead LFCSP package

JB

and 31.3°C/W for the 8-lead SOIC package.

, to estimate the

JB

) is calculated from

J

Figure 77. SOIC

Figure 76. LFCSP

Rev. B | Page 22 of 28

Data Sheet ADP7104

09507-073

09507-074

PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS

Heat dissipation from the package can be improved by increasing
the amount of copper attached to the pins of the ADP7104.
However, as listed in Tab l e 6, a point of diminishing returns
is eventually reached, beyond which an increase in the copper
size does not yield significant heat dissipation benefits.

Place the input capacitor as close as possible to the VIN and
GND pins. Place the output capacitor as close as possible to the
VOUT and GND pins. Use of 0805 or 0603 size capacitors and
resistors achieves the smallest possible footprint solution on
boards where area is limited.

Figure 79. Example SOIC PCB L ayout

Figure 78. Example LFCSP PCB L ayout

Rev. B | Page 23 of 28

ADP7104 Data Sheet

112008-A

PIN 1
INDICATOR
(R 0.2)

EXPOSED

PAD

BOTTOM VIEW

TOP VIEW

1

4

8

5

INDEX

AREA

3.00

BSC SQ

SEATING

PLANE

0.80

0.75

0.70

0.30

0.25

0.18

0.05 MAX

0.02 NOM

0.80 MAX

0.55 NOM

0.20 REF

0.50 BSC

COPLANARITY

0.08

2.48

2.38

2.23

1.74

1.64

1.49

0.50

0.40

0.30

COMPLIANTTOJEDEC STANDARDS MO-229-WEED-4

FOR PROP E R CONNECTION OF
THE EXPOSED PAD, REFER TO
THE PIN CO NFIGURATI ON AND
FUNCTIO N DE S CRIPTIONS
SECTION OF THIS DATA SHEET.

COMPLIANT TO JEDEC STANDARDS MS-012-A A

06-03-2011-B

1.27

0.40

1.75

1.35

2.41

0.356

0.457

4.00

3.90

3.80

6.20

6.00

5.80

5.00

4.90

4.80

0.10 MAX

0.05 NOM

3.81 REF

0.25

0.17

8°

0°

0.50

0.25

45°

COPLANARITY

0.10

1.04 REF

8

1

4

5

1.27 BSC

SEATING

PLANE

FOR PROP E R CONNECTION OF
THE EXPOSED PAD, REFER TO
THE PIN CO NFIGURATI ON AND
FUNCTIO N DE S CRIPTIONS
SECTION OF THIS DATA SHEET.

BOTTOM VIEW

TOP VIEW

0.51

0.31

1.65

1.25

3.098

OUTLINE DIMENSIONS

Figure 80. 8-Lead Lead Frame Chip Scale Package [LFCSP_WD]

3 mm × 3 mm Body, Very Very Thin, Dual Lead

(CP-8-5)

Dimensions shown in millimeters

Figure 81. 8-Lead Standard Small Outline Package, with Exposed Pad [SOIC_N_EP]

Narrow Body

(RD-8-2)

Dimensions shown in millimeters

Rev. B | Page 24 of 28

Data Sheet ADP7104

Temperature

Output

Package

Package

ADP7104ARDZ-1.5-R7

−40°C to +125°C

1.5

8-Lead SOIC_N_EP

RD-8-2

ORDERING GUIDE

Model1

Range

Voltage (V)

2, 3

Description

Option

Branding

ADP7104ACPZ-R7 −40°C to +125°C Adjustable 8-Lead LFCSP_WD CP-8-5 LH1
ADP7104ACPZ-1.5-R7 −40°C to +125°C 1.5 8-Lead LFCSP_WD CP-8-5 LK6
ADP7104ACPZ-1.8-R7 −40°C to +125°C 1.8 8-Lead LFCSP_WD CP-8-5 LK7
ADP7104ACPZ-2.5-R7 −40°C to +125°C 2.5 8-Lead LFCSP_WD CP-8-5 LKJ
ADP7104ACPZ-3.0-R7 −40°C to +125°C 3.0 8-Lead LFCSP_WD CP-8-5 LKK
ADP7104ACPZ-3.3-R7 −40°C to +125°C 3.3 8-Lead LFCSP_WD CP-8-5 LKL
ADP7104ACPZ-5.0-R7 −40°C to +125°C 5 8-Lead LFCSP_WD CP-8-5 LKM
ADP7104ACPZ-9.0-R7 −40°C to +125°C 9 8-Lead LFCSP_WD CP-8-5 LLD
ADP7104ARDZ-R7 −40°C to +125°C Adjustable 8-Lead SOIC_N_EP RD-8-2

ADP7104ARDZ-1.8-R7 −40°C to +125°C 1.8 8-Lead SOIC_N_EP RD-8-2
ADP7104ARDZ-2.5-R7 −40°C to +125°C 2.5 8-Lead SOIC_N_EP RD-8-2
ADP7104ARDZ-3.0-R7 −40°C to +125°C 3.0 8-Lead SOIC_N_EP RD-8-2
ADP7104ARDZ-3.3-R7 −40°C to +125°C 3.3 8-Lead SOIC_N_EP RD-8-2
ADP7104ARDZ-5.0-R7 −40°C to +125°C 5 8-Lead SOIC_N_EP RD-8-2
ADP7104ARDZ-9.0-R7 −40°C to +125°C 9 8-Lead SOIC_N_EP RD-8-2
ADP7104CP-EVALZ 3.3 LFCSP Evaluation Board
ADP7104RD-EVALZ 3.3 SOIC Evaluation Board
ADP7104CPZ-REDYKIT LFCSP REDYKIT
ADP7104RDZ-REDYKIT SOIC REDYKIT

1

Z = RoHS Compliant Part.

2

For additional voltage options, contact a local Analog Devices, Inc., sales or distribution representative.

3

The ADP7104CP-EVALZ and ADP7104RD-EVALZ evaluation boards are preconfigured with a 3.3 V ADP7104.

Rev. B | Page 25 of 28

ADP7104 Data Sheet

NOTES

Rev. B | Page 26 of 28

Data Sheet ADP7104

NOTES

Rev. B | Page 27 of 28

ADP7104 Data Sheet

©2011–2012 Analog Devices, Inc. All rights reserved. Trademarks and

NOTES

registered trademarks are the property of their respective owners.
D09507-0-3/12(B)

Rev. B | Page 28 of 28