ANALOG DEVICES ADP1715 Service Manual

500 mA, Low Dropout,

V

V

A

FEATURES

Maximum output current: 500 mA
Input voltage range: 2.5 V to 5.5 V
Low shutdown current: <1 μA
Low dropout voltage:

250 mV @ 500 mA load

50 mV @ 100 mA load
Initial accuracy: ±1%
Accuracy over line, load, and temperature: ±3%
16 fixed output voltage options with soft start:

0.75 V to 3.3 V (ADP1715)

Adjustable output voltage option: 0.8 V to 5.0 V

(ADP1715 Adjustable)
16 fixed output voltage options with tracking:

0.75 V to 3.3 V (ADP1716)
Stable with small 2.2 μF ceramic output capacitor
Excellent load/line transient response
Current limit and thermal overload protection
Logic controlled enable
8-lead thermally enhanced MSOP package

APPLICATIONS

Notebook computers
Memory components
Telecommunications equipment
Network equipment
DSP/FPGA/μP supplies
Instrumentation equipment/data acquisition systems

CMOS Linear Regulator

ADP1715/ADP1716

TYPICAL APPLICATION CIRCUITS

ADP1715

1

EN

VIN = 5V

OUT

2.2µF

= 3.3V

2

IN

3

OUT

4

SS

10nF2.2µF

Figure 1. ADP1715 with Fixed Output Voltage, 3.3 V

1
2
3

R1

4

R2

= 0.8(1 + R1/R2)

OUT

VIN = 5V

2.2µF

2.2µF

Figure 2. ADP1715 with Adjustable Output Voltage, 0.8 V to 5.0 V

DP1716

VIN = 5V

V

OUT

2.2µF

2.2µF

1
2
3
4

V

EN
IN
OUT
TRK

= 0V TO 5V

TRK

GND
GND
GND
GND

8
7
6
5

Figure 3. ADP1716 with Output Voltage Tracking

8

GND

7

GND

6

GND

5

GND

ADP1715

ADJUSTABLE

GND

EN
IN

GND

OUT

GND

ADJ

GND

V

(V)

OUT

3
2
1

0

8
7
6
5

12345

V

TRK

(V)

06110-001

06110-002

06110-003

GENERAL DESCRIPTION

The ADP1715/ADP1716 are low dropout, CMOS linear
regulators that operate from 2.5 V to 5.5 V and provide up to
500 mA of output current. Using an advanced proprietary
architecture, they provide high power supply rejection and
achieve excellent line and load transient response with just a
small 2.2 μF ceramic output capacitor.

Three versions of this part are available, one with fixed
output voltage options and variable soft start (ADP1715),
one with adjustable output voltage and fixed soft start
(ADP1715 Adjustable), and one with voltage tracking in
fixed output voltage options (ADP1716). The fixed output
voltage options are internally set to one of sixteen values

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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.
Trademarks and registered trademarks are the property of their respective owners.

between 0.75 V and 3.3 V; the adjustable output voltage can
be set to any value between 0.8 V and 5.0 V by an external
voltage divider connected from OUT to ADJ. The variable
soft start uses an external capacitor at SS to control the
output voltage ramp. Tracking limits the output voltage to
the at-or-below voltage at the TRK pin.

The ADP1715/ADP1716 are available in 8-lead thermally
enhanced MSOP packages, making them not only a very
compact solution but also providing 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] www.analog.com
Fax: [phone] ©2006 Analog Devices, Inc. All rights reserved.

ADP1715/ADP1716

TABLE OF CONTENTS

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

Track Mode (ADP1716)............................................................ 11

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

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

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

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

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

Absolute Maximum Ratings............................................................ 4

Thermal Resistance ...................................................................... 4

ESD Caution.................................................................................. 4

Pin Configurations and Function Descriptions ........................... 5

Typical Performance Characteristics ............................................. 6

Theory of Operation ...................................................................... 10

Soft-Start Function (ADP1715)................................................ 10

Adjustable Output Voltage (ADP1715 Adjustable) ...............11

REVISION HISTORY

Enable Feature ............................................................................ 11

Application Information................................................................ 12

Capacitor Selection .................................................................... 12

Current Limit and Thermal Overload Protection ................. 12

Thermal Considerations............................................................ 12

Printed Circuit Board Layout Considerations ....................... 15

Outline Dimensions....................................................................... 16

Ordering Guide .......................................................................... 17

9/06—Rev. 0: Initial Version

Rev. 0 | Page 2 of 20

ADP1715/ADP1716

SPECIFICATIONS

VIN = (V

+ 0.5 V) or 2.5 V (whichever is greater), I

OUT

= 10 mA, CIN = C

OUT

= 2.2 μF, TA = 25°C, unless otherwise noted.

OUT

Table 1.

Parameter Symbol Conditions Min Typ Max Unit

INPUT VOLTAGE RANGE VIN T
OPERATING SUPPLY CURRENT I

I

GND

I
I
I
100 μA < I
SHUTDOWN CURRENT I

EN = GND 0.1 μA

GND-SD

EN = GND, TJ = –40°C to +125°C 1.0 μA
FIXED OUTPUT VOLTAGE ACCURACY V

I

OUT

(ADP1715 and ADP1716 ONLY) I
100 μA < I
ADJUSTABLE OUTPUT VOLTAGE V

I

OUT

ACCURACY (ADP1715 ADJUSTABLE)1 I
100 μA < I
LINE REGULATION ∆V
LOAD REGULATION

2

/∆VIN VIN = (V

OUT

∆V

/∆I

OUT

I
DROPOUT VOLTAGE

3

V

DROPOUT

I
I
I
I
I
I
I
START-UP TIME

4

T

START-UP

ADP1715 Adjustable and ADP1716 100 μs
ADP1715 with External Soft Start CSS = 10 nF 7.3 ms

CURRENT LIMIT THRESHOLD

5

I

550 750 1200 mA

LIMIT

THERMAL SHUTDOWN THRESHOLD TSSD T

THERMAL SHUTDOWN HYSTERESIS TS

SOFT-START SOURCE CURRENT

SS

SD-HYS

I-SOURCE

(ADP1715 WITH EXTERNAL
SOFT START)

V

to V

OUT

ACCURACY V

TRK

TRK-ERROR

(ADP1716) 0 V ≤ V
EN INPUT LOGIC HIGH VIH 2.5 V ≤ VIN ≤ 5.5 V 1.8 V
EN INPUT LOGIC LOW VIL 2.5 V ≤ VIN ≤ 5.5 V 0.4 V
EN INPUT LEAKAGE CURRENT V
ADJ INPUT BIAS CURRENT

I-LEAKAGE

ADJ

I-BIAS

(ADP1715 ADJUSTABLE)
OUTPUT NOISE OUT

NOISE

10 Hz to 100 kHz, V
POWER SUPPLY REJECTION RATIO PSRR 1 kHz, V
1 kHz, V

1

Accuracy when OUT is connected directly to ADJ. When OUT voltage is set by external feedback resistors, absolute accuracy in adjust mode depends on the tolerances

of resistors used.

2

Based on an end-point calculation using 10 mA and 500 mA loads. See Figure 8 for typical load regulation performance for loads less than 10 mA.

3

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 2.5 V.

4

Start-up time is defined as the time between the rising edge of EN to OUT being at 95% of its nominal value.

5

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 1.0 V

output voltage is defined as the current that causes the output voltage to drop to 90% of 1.0 V, or 0.9 V.

= –40°C to +125°C 2.5 5.5 V

J

= 100 μA 65 μA

OUT

= 100 μA, TJ = –40°C to +125°C 100 μA

OUT

= 100 mA 160 μA

OUT

= 100 mA, TJ = –40°C to +125°C 220 μA

OUT

< 500 mA, TJ = –40°C to +125°C 650 μA

OUT

= 10 mA –1 +1 %

OUT

= 10 mA to 500 mA –2 +2 %

OUT

< 500 mA, TJ = –40°C to +125°C –3 +3 %

OUT

= 10 mA 0.792 0.8 0.808 V

OUT

= 10 mA to 500 mA 0.784 0.816 V

OUT

< 500 mA, TJ = –40°C to +125°C 0.776 0.824 V

OUT

+ 0.5 V) to 5.5 V, TJ = –40°C to +125°C –0.15 +0.15 %/ V

OUT

I

OUT

I

= 10 mA to 500 mA 0.002 %/mA

OUT

= 10 mA to 500 mA, TJ = –40°C to +125°C 0.004 %/mA

OUT

= 100 mA, V

OUT

= 100 mA, V

OUT

= 500 mA, V

OUT

= 500 mA, V

OUT

= 100 mA, 2.5 V ≤ V

OUT

= 100 mA, 2.5 V ≤ V

OUT

= 500 mA, 2.5 V ≤ V

OUT

= 500 mA, 2.5 V ≤ V

OUT

≥ 3.3 V 50 mV

OUT

≥ 3.3 V, TJ = –40°C to +125°C 100 mV

OUT

≥ 3.3 V 250 300 mV

OUT

≥ 3.3 V, TJ = –40°C to +125°C 400 mV

OUT

< 3.3 V 60 mV

OUT

< 3.3 V, TJ = –40°C to +125°C 100 mV

OUT

< 3.3 V 320 400 mV

OUT

< 3.3 V, TJ = –40°C to +125°C 500 mV

OUT

rising 150

J

15

°C

°C

SS = GND 0.7 1.2 1.7 μA

0 V ≤ V

≤ (0.5 × V

TRK

≤ (0.5 × V

TRK

OUT(NOM)

OUT(NOM)

), V
), V

≤ 1.8 V, TJ = –40°C to +125°C –50 +50 mV

OUT(NOM)

> 1.8 V, TJ = –40°C to +125°C –100 +100 mV

OUT(NOM)

EN = IN or GND 0.1 1 μA

30 100 nA

10 Hz to 100 kHz, V

= 0.75 V 67 dB

OUT

= 3.3 V 53 dB

OUT

= 0.75 V 125 μVrms

OUT

= 3.3 V 450 μVrms

OUT

Rev. 0 | Page 3 of 20

ADP1715/ADP1716

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

IN to GND –0.3 V to +6 V
OUT to GND –0.3 V to IN
EN to GND –0.3 V to +6 V
SS/ADJ/TRK to GND –0.3 V to +6 V
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; 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 RESISTANCE

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

Table 3. Thermal Resistance

Package Type θJA Unit

8-Lead MSOP 118 °C/W

ESD CAUTION

Rev. 0 | Page 4 of 20

ADP1715/ADP1716

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

1

EN

ADP1715

2

IN

OUT

SS

FIXED

3

TOP VIEW

(Not to Scale)

4

Figure 4. 8-Lead MSOP (RM-Suffix) Figure 5. 8-Lead MSOP (RM-Suffix) Figure 6. 8-Lead MSOP (RM-Suffix)

Table 4. Pin Function Descriptions

ADP1715
Fixed
Pin No.

ADP1715
Adjustable
Pin No.

1 1 1 EN

2 2 2 IN Regulator Input Supply. Bypass IN to GND with a 2.2 μF or greater capacitor.
3 3 3 OUT

4 SS Soft Start. A capacitor connected to this pin determines the soft-start time.
4 ADJ Adjust. A resistor divider from OUT to ADJ sets the output voltage.
4 TRK

5, 6, 7, 8 5, 6, 7, 8 5, 6, 7, 8 GND Ground.

8

GND

7

GND

6

GND

5

GND

6110-004

EN

IN

OUT

ADJ

ADP1716
Pin No. Mnemonic Description

1

ADP1715

2

ADJUSTABLE

3

TOP VIEW

(Not to Scale)

4

8

GND

7

GND

6

GND

5

GND

6110-005

EN

OUT
TRK

IN

1
2

ADP1716

3

TOP VIEW

(Not to Scale)

4

8

GND

7

GND

6

GND

5

GND

6110-006

Enable Input. Drive EN high to turn on the regulator; drive it low to turn off the
regulator. For automatic startup, connect EN to IN.

Regulated Output Voltage. Bypass OUT to GND with a 2.2 μF or greater
capacitor.

Track. The output will follow the voltage placed on the TRK pin. (See the
Theory of Operation section for a more detailed description.)

Rev. 0 | Page 5 of 20

ADP1715/ADP1716

TYPICAL PERFORMANCE CHARACTERISTICS

VIN = 3.8 V, I

3.364

3.354

3.344

3.334

3.324

3.314

3.304

(V)

3.294

OUT

V

3.284

3.274

3.264

3.254

3.244

3.234

Figure 7. Output Voltage vs. Junction Temperature

3.325

3.315

3.305

(V)

3.295

OUT

V

3.285

3.275

3.265

0.1 1000

3.325

= 10 mA, CIN = 2.2 μF, C

OUT

–40

I

I

LOAD

LOAD

I

LOAD

TJ (°C)

(mA)

I

= 100µA

LOAD

I

= 500mA

LOAD

–5 25 85 125

1 10 100

= 10mA

= 360mA

OUT

I

I

LOAD

LOAD

Figure 8. Output Voltage vs. Load Current

= 2.2 μF, TA = 25°C, unless otherwise noted.

500

450

I

0

–40

Figure 10. Ground Current vs. Junction Temperature

0

0

0.1 1000

Figure 11. Ground Current vs. Load Current

= 100mA

= 250mA

400

350

300

(µA)

250

GND

I

200

150

100

50

06110-007

500

450

400

350

300

(µA)

250

GND

I

200

150

100

50

06110-008

600

= 500mA

LOAD

I

= 360mA

LOAD

I

= 250mA

LOAD

I

= 100mA

LOAD

I

LOAD

–5 25 85 125

TJ (°C)

1 10 100

I

(mA)

LOAD

= 10mA

I

LOAD

= 100µA

06110-010

06110-011

(V)

V

OUT

3.315

3.305

3.295

3.285

3.275

3.265

I

= 100µA

LOAD

I

= 10mA

LOAD

I

= 100mA

LOAD

I

= 250mA

LOAD

I

= 500mA

LOAD

3.3 3.8 4.3 4.8 5.3
VIN (V)

Figure 9. Output Voltage vs. Input Voltage

I

LOAD

= 360mA

06110-009

Rev. 0 | Page 6 of 20

500

I

400

(µA)

300

GND

I

200

100

0

3.3 3.8 4.3 4.8 5.3

LOAD

= 500mA

I

= 360mA

LOAD

I

LOAD

VIN (V)

= 250mA

I

= 100mA

LOAD

I

LOAD

Figure 12. Ground Current vs. Input Voltage

= 10mA

I

LOAD

= 100µA

06110-012