Diodes AP7331 User Manual

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

Description

The AP7331 is a 300mA, adjustable and fixed output voltage, low dropout linear regulator. The device included pass element, error amplifier, band-gap, current limit and thermal shutdown circuitry. The device is turned on when EN pin is set to logic high level.

The characteristics of low dropout voltage and low quiescent current make it suitable for low power applications, for example, battery powered devices. The typical quiescent current is approximately 65μA.

Built-in current-limit and thermal-shutdown functions prevent IC from damage in fault conditions.

The AP7331 is available in SOT25 and DFN2020-6 packages.

AP7331

LOW DROPOUT LINEAR REGULATOR

Pin Assignments

OUT

NC

SOT25 (ADJ Output)

(Top View)

DFN2020-6 (ADJ Output)

(To p Vie w)

1

EN

GND

2

3

IN

SOT25 (Fixed Output)

(To p Vie w)

IN

GND

EN

1

2

3

5

4

DFN2020-6 (Fixed Output)

(To p Vie w)

EN

GND

1

2

3

6

NC

5

NC

OUT

4IN

6

ADJ

5

NC

OUT

4

Features

• 300mA Low Dropout Regulator with EN

• Very low I

• Wide input voltage range: 2V to 6V

• Wide adjustable output: 0.8V to 5.0V

• Fixed output options: 1.0V to 3.3V

• PSRR: 65dB typical at 100Hz

• Fast start-up time: 80µs

• Stable with low ESR, 1µF ceramic output capacitor

• Excellent Load/Line Transient Response

• Low dropout: 300mV typical at 300mA

• Current limit protection

• Short circuit protection

• Thermal shutdown protection

• Ambient temperature range: -40ºC to 85°C

• SOT25 and DFN2020-6: Available in “Green” Molding

over full load: 65µA

Q

Applications

• XDSL Routers

• Wireless LAN Cards

• Desktop and Notebook Computers

• Battery Powered Equipments

Compound (No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 1)

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html

AP7331

Document number: DS31914 Rev. 3 - 2

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Typical Application Circuit

V

IN

OUT

AP7331

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

V

OUT

IN

OUT

V

OUT

AP7331

1uF

Enable

EN

GND

Fixed Output

1uF

Enable

Pin Descriptions

Pin Number

Pin Name

IN 1 3 1 3

SOT25

(fixed)

DFN2020-6

(fixed)

SOT25

(adj)

DFN2020-6

(adj)

Voltage input pin. Bypass to ground through at least 1µF capacitor

GND 2 2 2 2 Ground

EN 3 1 3 1 Enable input, active high

ADJ - - 4 6 Output feedback pin

NC 4 5, 6 - 5 No connection

OUT 5 4 5 4

Voltage output pin. Bypass to ground through 1µF ceramic capacitor

Functional Block Diagram

AP7331

EN

ADJ

GND

Adjustable Output

⎛ ⎜

1

V

OUT

V

REF

⎜ ⎝

Description

R1

R2

⎞

R

1

⎟

+=

⎟

R

2

⎠

1uF

IN

EN

Gate

Driver

Fixed Version

AP7331

Document number: DS31914 Rev. 3 - 2

Current Limit and Thermal

Shutdown

0.4V

OUT

R

GND

EN

IN

Gate

Driver

Adjustable V e rs ion

Current Limit and Thermal

Shutdown

0.4V

OUT

ADJ

GND

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AP7331

Absolute Maximum Ratings

Symbol Parameter Ratings Units

ESD HBM Human Body Model ESD Protection 6 kV

ESD MM Machine Model ESD Protection 400 V

VIN Input Voltage 7 V

EN Voltage VIN + 0.3 V

Continuous Load Current Internal Limited TOP Operating Junction Temperature Range -40 ~ 125 °C TST Storage Temperature Range -65 ~150 °C

PD Power Dissipation (Note 2)

TJ Maximum Junction Temperature 150 °C

Recommended Operating Conditions

Symbol Parameter Min Max Unit

V

IN

I

OUT

T

A

Notes: 2. Ratings apply to ambient temperature at 25°C

3. The device maintains a stable, regulated output voltage without a load current.

Input voltage 2 6 V Output Current (Note 3) 0 300 mA Operating Ambient Temperature -40 85

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

SOT25 640 mW DFN2020-6 740 mW

°C

AP7331

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AP7331

⎯

x

Electrical Characteristics

(TA = 25oC, V

Symbol Parameter Test Conditions Min Typ. Max Unit

I

Q

I

SHDN

I

LEAK

V

Dropout

V

REF

I

ADJ

V

OUT

ΔV

OUT

ΔV

/V

/

IN

ΔV

OUT

/V

OUT

tST Start-up Time

PSRR PSRR

I

SHORT

I

LIMIT

V

IL

V

IH

I

EN

T

SHDN

T

HYS

θ

Thermal Resistance Junction-to-Ambient

JA

Notes: 4. Dropout voltage is the voltage difference between the input and the output at which the output voltage drops 2% below its nominal value. This parameter only applies to output voltages above 1.8V.

5. Test conditions for SOT25: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, single sided

6. Test conditions for DFN2020-6: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, double sided, bottom layer is a copper plane.

= V

OUT

+1V, C

IN

= 1uF, C

IN

Input Quiescent Current Input Shutdown Current VEN = 0V, I

Input Leakage Current VEN = 0V, OUT grounded Dropout Voltage (Note 4) I

ADJ Reference Voltage (Adjustable version) I

ADJ Leakage (Adjustable version)

Output Voltage Accuracy

Line Regulation

Load Regulation

Short-circuit Current

Current Limit V EN Input Logic Low Voltage VIN = V EN Input Logic High Voltage VIN = V EN Input Current VIN = 0V or V Thermal Shutdown Threshold 140 Thermal Shutdown Hysteresis 15

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

OUT

= 1uF, V

= 2V, unless otherwise stated)

EN

= VIN, I

V

EN

V

= VIN, I

EN

= 300mA 300 550 mV

OUT

= 0mA 0.4 V

OUT

T

= -40oC to 85oC,

A

= 30mA

I

OUT

V

= (V

IN

= VIN, I

V

EN

V

= (V

IN

from 1mA to 300mA

I

OUT

= 0V to 2.0V, V

V

EN

= 300mA

I

OUT

V

= [V

IN

f = 100Hz, I

= V

V

IN

< 0.2V

V

OUT OUT/ROUT

= 0mA

OUT

= 300mA 65 85

OUT

= 0mA

OUT

+1V) to V

OUT

= 1mA

OUT

+1V) to V

OUT

+1V]VDC + 0.5V

OUT

=30mA

OUT

to V

IN-Min

IN-Max

OUT

IN-Max

= 1V,

,

ppAC

-0.6 0.6 %

,

= 1A 400 600 mA

IN-Min IN-Min

to V to V

IN-Ma

0.4 V

IN-Ma

1.4 V

IN-Max

-1 1 μA

SOT25 (Note 5) 190 DFN2020-6 (Note 6) 167

55 75

1 1

1 μA

-2 2 %

0.01 0.20 %/V

80 μs 65 dB 100 mA

μA μA

μA

°C °C

o

C/W

o

C/W

AP7331

Document number: DS31914 Rev. 3 - 2

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Typical Characteristics

AP7331

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

Quiesce nt Cur r ent vs I nput Voltage

Iload=300mA

62

VOUT = 3.3V VOUT = 3.3V

61 60 59

58 57 56

Quiesce nt Curre nt (u A )

55 54

4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1

90°C

25°C

Input Volt age (V )

-45°C

56

54

52

50

48

46

Quiescent Current (uA)

44

42

4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1

Reference Voltage vs Input Voltage

0.41

0.1

-45°C

0.405

0.4

0.395

0.39

90°C

25°C

0.385

Reference Volt age (V )

0.38

4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1

0.08

0.06

0.04

0.02

Output Volt age Variat i on (%/V)

0

Input Vol t age (V )

Quiescent Current vs I nput Vol tage

Iload=0mA

90°C

-45°C 25°C

Input Voltage (V)

Line Regulation ( %/V)

VOUT = 3.3V V

IN = VOUT +1V

4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1

90°C

-45°C

25°C

Input Voltage (V)

Load Regulati on ( %)

0.6

VOUT = 3.3V

0.4

V

IN = VOUT + 1V

0.2

0

-0.2

25°C -45°C

-0.4

Output Vol t ag e V ari ation (%)

-0.6 0 50 100 150 200 250 300

Output Current (mA )

AP7331

Document number: DS31914 Rev. 3 - 2

90°C

Dropout Volt age (mV )

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Dropout Vol t age

400

VOUT = 3.3V

350

300

250

200

150

100

50

0

0 50 100 150 200 250 300

90°C

25°C

Output Current (m A)

-45°C

January 2011

)

Typical Characteristics (Continued)

AP7331

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

Short Circuit vs Input Voltage

115

VOUT=3.3V

110

105

100

95

90

Output Current (mA)

85

80

3.5 4 4.5 5 5.5 6

25°C

-45°C

90°C

Input Voltage (V)

600

550

500

450

Cur re n t L i mit (mA )

400

2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 6

Current Li m i t v s I nput Vol t age

TA = 25°C V

OUT = 1.8V

Input Voltage (V)

PSRR

70

V

= 1.8V

65 60 55 50

PSRR (dB

45 40 35

0.1 1 10 100

F requency (kHz)

OUT

V

IN

C

IN

T

A

= 2.8V

= C

OUT

= 25°C

= 1uF

70 65 60 55 50

PSRR (dB

45 40 35

0.1 1 10 100

PSRR

V V C T

Freque ncy (kHz)

= 3.3V

OUT

= 4.3V

IN

= C

IN

= 25°C

A

OUT

= 1uF

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Typical Characteristics (Continued)

Start-Up Time (No Load)

VEN = 0 to 2V (1V/div) V

= 4.3V

IN

= C

OUT

=1uF

V

OUT

= 3.3V (1V/div)

C

IN

AP7331

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

Start-Up Time (300mA Load)

= 0 to 2V (1V/div)

V

EN

V

= 4.3V

IN

C

= C

OUT

=1uF

V

OUT

= 3.3V (1V/div)

= 300mA (300mA/div)

I

OUT

IN

Time (50us/div)

Line Transient Response

=4.3V to 5.3V (1V/div)

V

IN

Tr = 10us

= 3.3V (50mV/div)

V

OUT

= 300mA (300mA/div)

I

OUT

Time (50us/div)

Load Transient Response

= 3.3V

V

OUT

(100mV/div)

Time (50us/div)

Line Transient Response

V

= 5.3V to 4.3V (1V/div)

IN

Tf =1 0us

V

= 3.3V (50mV/div)

OUT

I

= 300mA (300mA/div)

OUT

Time (50us/div)

Load Transient Response

= 0.8V

V

OUT

(100mV/div)

= 1mA to 300mA

I

OUT

(100mA/div)

Time (100us/div)

AP7331

Document number: DS31914 Rev. 3 - 2

Tr = Tf = 10us V

=4.3V

IN

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= 1mA to 300mA

I

OUT

(100mA/div)

Time (100us/div)

Tr = Tf = 10us V

= 2V

IN

January 2011

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

Application Note

Input Capacitor

A 1μF ceramic capacitor is recommended to connect between V glitch and noise. The amount of the capacitance ma y be increased without limit. This input capacitor must be located as close as possible to the device to assure i nput stability and less noise. For PCB layout, a wide copper trace is required for both V capacitor allows the use of less capacitance, while highe r ESR type requires more capacitance.

Output Capacitor

The output capacitor is required to stabilize and help transient response for LDO. The AP7331 is stable with very small ceramic output capacitors. The recommended capacitance is from 1 Resistance (ESR) is from 10m temperature characteristic is X7R or X5R. Higher capacitance values help to improve load/line transient response. The output capacitance may be increased to keep low undershoot/overshoot. Place output capacitor as close as possible to OUT and GND pins, and keep the leads as short as possible.

Adjustable Operation

The AP7331 provides output voltage from 0.8V to 5.0V through external resistor divider as shown below.

V

IN

The output voltage is calculated by:

Where V Rearranging the equation will give the following that is

used for adjusting the output to a particular voltag e:

To maintain the stability of the inter nal reference voltage,

need to be kept smaller than 125kΩ.

R

2

No Load Stability

Other than external resistor divider, no minimum load is required to keep the device stable. The device will remain stable and regulated in no load condition.

and GND pins to decouple input power supply

IN

and GND. A lower ESR

IN

μF to 4.7μF, Equivalent Series

Ω to 200mΩ, and

R1

R2

V

⎞

1

⎟ ⎟

2

⎠

⎞ ⎟

⎟ ⎠

IN

1uF

Enable

EN

V

OUT

=0.4V (the internal reference voltage)

REF

R

AP7331

1

GND

R

2

V

⎛ ⎜

⎜ ⎝

OUT

ADJ

REF

V

⎛ ⎜ ⎜ ⎝

OUT REF

+=

1

−= 1

R R

OUT

1uF

AP7331

LOW DROPOUT LINEAR REGULATOR

ON/OFF Input Operation

The AP7331 is turned on by setting t he EN pin high, and is turned off by pulling it low. If this feature is not used, the EN pin should be tied to IN pin to keep the regulator output on at all time. To ensure proper operation, the signal source used to drive the EN pin must be able to swing above and below the specified turn-on/off volt age thresholds listed in the Electrical

Characteristics section under V

Current Limit Protection

When output current at OUT pin is higher than current limit threshold, the current limit protection will be triggered and clamp the output current to appro ximately 600mA to prevent over-current and to protect the regulator from damage due to overheating.

Short Circuit Protection

When OUT pin is short-circuit to GND or OUT pin voltage is less than 200mV, short circuit protection will be triggered and clamp the output current to appro ximately 100mA. This feature protects the regulator from overcurrent and damage due to overheating.

Thermal Shutdown Protection

Thermal protection disables the output when the junction temperature rises to approximately +140°C , allowing the device to cool down. When the junction temperature reduces to approximately +125°C the output circuitry is enabled again. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. This cycling limits the heat dissipation of the regulator, protecting it from damage due to overheating.

Ultra Fast Start-up

After enabled, the AP7331 is able to provide full power in as little as tens of microseconds, typically 80µs, without sacrificing low ground current. This feature will help load circuitry move in and out of standby mode in real time, eventually extend battery life for mobile pho nes and oth er portable devices.

Fast Transient Response

Fast transient response LDOs can extend battery life. TDMA-based cell phone protocols such as Global System for Mobile Communications (GSM) have a transmit/receive duty factor of only 12. 5 percent , ena blin g power savings by putting much of the baseband circuit ry into standby mode in between transmit cycles. In baseband circuits, the load often transitions virtually instantaneously from 100µA to 100mA. To meet this load requirement, the LDO must react very quickly without a large voltage drop or overshoot — a requirement that cannot be met with conventional, general-purpose LDOs.

and VIH.

IL

AP7331

Document number: DS31914 Rev. 3 - 2

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300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

Application Note (Continued)

Fast Transient Response (Continued)

The AP7331’s fast transient response from 0 to 300mA provides stable voltage supply for fast DSP and GSM chipset with fast changing load.

Small Overshoot and Undershoot

The AP7331 has small and controlled overshoot and undershoot in load and line transitions. This helps to protect supplied circuit from damage and operation error caused by glitches. This feature also permits the usage of small value output decoupling capacitor with AP7331.

Ordering Information

AP7331 - XX XX G - 7

AP7331

LOW DROPOUT LINEAR REGULATOR

Low Quiescent Current

The AP7331, consuming only around 65µA for all input range and output loading, provides great po wer saving in portable and low power applications.

Wide Output Range

The AP7331, with a wide output range of 0.8V to 5. 0V, provides a versatile LDO solution for many portable applications.

Output

Blank : ADJ

10 : 1.0V

Package Green

W : SOT25

SN : DFN2 020-6

G : Green

Packing

7 : Tape & Reel

12 : 1.2V 15 : 1.5V

18 : 1.8V

20 : 2.0V

25 : 2.5V 28 : 2.8V 30 : 3.0V 33 : 3.3V

Device Package Code

AP7331-XXWG-7 W SOT25 3000/Tape & Reel -7

AP7331-XXSNG-7 SN DFN2020-6 3000/Tape & Reel -7

Note: 7. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf.

Packaging

(Note 7)

Quantity Part Number Suffix

7” Tape and Reel

Marking Information

1. SOT25

AP7331

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AP7331

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

( Top View )

W X

7

4

XX : Identification code

Y

: Year 0~9 : Week : A~Z : 1~26 week;

W

a~z : 27~52 week; z represents 52 and 53 week

X

: A~Z : Green

5

XX

Y

1 2 3

Device Package Identification Code

AP7331-ADJ SOT25 QJ

AP7331-10 SOT25 QK AP7331-12 SOT25 QL AP7331-15 SOT25 QM AP7331-18 SOT25 QN AP7331-20 SOT25 QT AP7331-25 SOT25 QP AP7331-28 SOT25 QQ AP7331-30 SOT25 QR AP7331-33 SOT25 QS

2. DFN2020-6

( Top View )

XX

Y

X

W

Device Package Identification Code

AP7331-ADJ DFN2020-6 QJ

AP7331-10 DFN2020-6 QK AP7331-12 DFN2020-6 QL AP7331-15 DFN2020-6 QM AP7331-18 DFN2020-6 QN AP7331-20 DFN2020-6 QT AP7331-25 DFN2020-6 QP AP7331-28 DFN2020-6 QQ AP7331-30 DFN2020-6 QR AP7331-33 DFN2020-6 QS

XX : Identification Code

Y : Year : 0~9

: Week : A~Z : 1~26 week;

W

a~z : 27~52 week; z represents

52 and 53 week

X

: A~Z : Green

Package Outline Dimensions (All Dimensions in mm)

1. Package Type: SOT25

AP7331

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AP7331

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

2. Package Type: DFN2020-6

0.05 C

0.08 C

0.15 C

2x-

Tape Orientation (Note 8)

DFN2020-6

AP7331

Document number: DS31914 Rev. 3 - 2

0.57/0.63

B

1.95/2.075

0/0.05

2x

0.76/0.96

1

.

0

R

0.65nom.

C

0.15

1.95/2.075

1.45/1.65

Bottom View

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Marking

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0.15max.

A

0.30/0.40

0.2/0.3

Pin#1 ID

0.43mon.

(Active area depth)

Seating plane

C

0.05

M C A B

January 2011

AP7331

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

Notes: 8. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf

AP7331

Document number: DS31914 Rev. 3 - 2

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AP7331

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

IMPORTANT NOTICE

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY A ND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporat ed does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. A ny Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harml ess ag ai nst all damages.

Diodes Incorporated does not warrant or acc ept any liability whatsoever in respec t of any products purchas ed through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless agai nst all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death ass ociated with such unintended or unauthorized application.

Products described herein may be covered by one or more United Stat es, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

LIFE SUPPORT

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herei n:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructi ons for us e provided in the labeling can be reasonably expected to result in significant injury to the user.

B. A crit ical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed

to cause the failure of the life support device or to affect its safety or effectiveness .

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives agai nst any damages arising out of the use of Diodes Incorporated products in such safety-critic al, l ife support devic es or syst ems .

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AP7331

Document number: DS31914 Rev. 3 - 2

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