Diodes AP7333 User Manual

AP7333

300mA, Low Quiescent Current, Fast Transient

Low Dropout Linear Regulator

Features

• 300mA Low Dropout Regulator in 3-pin package

• Very low I

• Wide input voltage range: 2V to 6V

• 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

• SOT23 and SOT23R: Available in “Green” Molding

Compound (No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 1)

over full load: 65µA

Q

Applications

• XDSL Router

• Wireless LAN Cards

• Desktop and Notebook Computers

• Battery Powered Equipments

• Mouse, Keyboards

Typical Application Circuit

Description

The AP7333 is a 300mA, fixed output voltage, low dropout linear regulator. The device included pass element, error amplifier, band-gap, current limit and thermal shutdown circuitry.

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 AP7333 is available in SOT23 packages with different pin-outs.

V

IN

OUT

V

OUT

AP7333

1uF

GND

AP7333 Rev. 2 1 of 12 NOVEMBER 2009

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Ordering Information

AP7333

300mA, Low Quiescent Current, Fast Transient

Low Dropout Linear Regulator

AP7333 - XX XX G - 7

Output

10 : 1.0V 12 : 1.2V

Package Green

SA : SOT23

G : Green

SR : SOT23R

Packing

7 : Tape & Reel

15 : 1.5V 18 : 1.8V

20 : 2.0V

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

Device Package Code

AP7333-XXSAG-7 SA SOT23 3000/Tape & Reel -7 AP7333-XXSRG-7 SR SOT23R 3000/Tape & Reel -7

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit o ur website at

http://www.diodes.com/datasheets/ap02001.pdf.

http://www.diodes.com/products/lead_free.html

2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at

Packaging

(Note 2)

7” Tape and Reel

Quantity Part Number Suffix

Pin Assignment

(1) SOT23 (1) SOT23R

IN

OUT

( Top View )

1

2

3

GND

OUT

( Top View )

1

2

3

IN

AP7333 Rev. 2 2 of 12 NOVEMBER 2009

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300mA, Low Quiescent Current, Fast Transient

Pin Descriptions

Pin Name

IN 1 3

OUT 2 2 GND 3 1 Ground

Functional Block Diagram

Pin Number

SOT23 SOT23R

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

AP7333

Low Dropout Linear Regulator

Description

IN

Gate

Driver

Current Lim it

and Thermal

Shutdown

V

REF

OUT

R

GND

AP7333 Rev. 2 3 of 12 NOVEMBER 2009

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AP7333

300mA, Low Quiescent Current, Fast Transient

Low Dropout Linear Regulator

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

Continuous Load Current Internal Limited

TOP Operating Junction Temperature Range -40 ~ 125 °C

TST Storage Temperature Range -65 ~150 °C

PD Power Dissipation (Note 3)

TJ Maximum Junction Temperature 150 °C

SOT23 600 mW SOT23R 540 mW

Recommended Operating Conditions

Symbol Parameter Min Max Unit

V

IN

I

OUT

T

A

Notes: 3. Ratings apply to ambient temperature at 25°C

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

Input voltage 2 6 V

Output Current (Note 4) 0 300 mA

Operating Ambient Temperature -40 85

°C

AP7333 Rev. 2 4 of 12 NOVEMBER 2009

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⎯

AP7333

300mA, Low Quiescent Current, Fast Transient

Low Dropout Linear Regulator

Electrical Characteristics

(TA = 25oC, V

Symbol Parameter Test Conditions Min Typ. Max Unit

I

V

Dropout

V

OUT

ΔV

/ΔV

ΔV

/V

tST

PSRR

I

SHORT

I

LIMIT

T

SHDN

T

HYS

θ

Notes: 5. 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.

6. Test conditions for SOT23 and SOT23R: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, single sided.

= V

+1V, C

IN

OUT

Input Quiescent Current

Q

Dropout Voltage (Note 5) I Output Voltage Accuracy

OUT

Line Regulation

/V

IN OUT

Load Regulation

OUT

Start-up Time PSRR Short-circuit Current

Current Limit V

= 1uF, C

IN

= 1uF, unless otherwise stated)

OUT

= 0mA

I

OUT

I

= 300mA 65 85

OUT

= 300mA 300 550 mV

OUT

T

= -40oC to 85oC,

A

I

= 30mA

OUT

= (V

V

IN

= 1mA

I

OUT

V

= (V

IN

I

from 1mA to 300mA

OUT

V

= 0V to 2.0V, V

IN

= 300mA

I

OUT

V

= [V

IN

f = 100Hz, I V

= V

IN

V

OUT OUT/ROUT

+1V) to V

OUT

+1V) to V

OUT

+1V]VDC + 0.5V

OUT

= 30mA

OUT

to V

IN-Min

IN-Max

OUT

IN-Max

= 1V,

,

ppAC

< 0.2V

= 1A 400 600 mA

-2 2 %

0.01 0.20 %/V

-0.6 0.6 % 80 μs

,

65 dB 100 mA

Thermal Shutdown Threshold 140 Thermal Shutdown Hysteresis 15

Thermal Resistance Junction-to-Ambient

JA

SOT23 (Note 6) 207 SOT23R (Note 6) 230 oC/W

55 75

μA

°C °C

o

C/W

AP7333 Rev. 2 5 of 12 NOVEMBER 2009

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300mA, Low Quiescent Current, Fast Transient

Typical Performance Characteristics

Quiescent Curr ent vs Input Voltage

60

Vout=2.5V

58

56

54

52

Outp u t Cu rr ent (mA)

50

48

2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6

Iload=0mA

90℃

25℃ -45℃

Input Voltage (V)

AP7333

Low Dropout Linear Regulator

Line Regulation (%/V)

0.1

0.06

0.02

-0.02

-0.06

Output Voltage Variation (%/V)

-0.1

3.5 4 4.5 5 5.5 6

Vout=2.5V V

90℃

in=Vout +1V

Input Voltage (V)

25℃

-45℃

Load Regulati on (%)

0.6

0.4

0.2

0

-0.2

Vout=2.5V

-0.4

Output V o ltage Variation (%)

in=Vout +1V

V

-0.6 0 50 100 150 200 250 300

-45℃

25℃

90℃

Output Current (mA)

350

Vout=2.5V

300

250

200

150

100

Dropout Voltage (mV)

50

0

0 50 100 150 200 250 300

Dropout Vol tage

90℃

25℃

Output Cu rr ent (m A)

-45℃

Short Ci rc ui t vs I nput Vol t a ge

105

Vout=2.5V

100

95

90

85

Outpu t Cu r re n t (mA)

80

75

3.5 4 4.5 5 5.5 6

-45℃

25℃

Input Voltage (V)

Current Limit (mA)

90℃

Current Limit vs Input Voltage

600

Ta=25℃

out=2.5V

V

550

500

450

400

3.5 4 4.5 5 5.5 6

Input Voltage (V)

AP7333 Rev. 2 6 of 12 NOVEMBER 2009

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300mA, Low Quiescent Current, Fast Transient

Typical Performance Characteristics (Continued)

AP7333

Low Dropout Linear Regulator

75

70

65

60

55

PS RR (d B)

50

45

40

35

0.1 1 10 100

PSRR

Vout=1V Vin=2V Cin=Cout=1uF Ta=25℃

Frequency (kHz)

75

70

65

60

55

PS RR (d B)

50

45

40

35

0.1 1 10 100

PSRR

Vout=2.5V Vin=3.5V Cin=Cout=1uF Ta=25℃

Freque ncy (kHz)

Line Transient Response

Vin=2V to 3V (1V/div)

Tr=10us

Vout=1V (50mV/div)

Line Transient Response

Vin=3V to 2V (1V/div)

Tr=10us

Vout=1V (50mV/div)

Iout=300mA (300mA/div)

Time (50us/div)

Iout=300mA (300mA/div)

AP7333 Rev. 2 7 of 12 NOVEMBER 2009

300mA, Low Quiescent Current, Fast Transient

Typical Performance Characteristics (Continued)

Tr=Tf=10us Vin=2V

Load Transient Response

Tr=Tf=10us

Vin=3.5V Vout=1V (100mV/div)

Load Transient Response

AP7333

Low Dropout Linear Regulator

Vout=2.5V (100mV/div)

Iout=1mA to 300mA (100mA/div)

Time (200us/div)

Start-Up Time (No Load)

Vin=0 to 3.5V (1V/div) Cin=Cout=1uF

Vout=2.5V (1V/div)

Time (50us/div)

Start-Up Time (300mA Load)

Vin=0 to 3.5V (1V/div) Cin=Cout=1uF

Vout=2.5V (1V/div)

Iout (300mA/div)

Time (50us/div)

AP7333 Rev. 2 8 of 12 NOVEMBER 2009

300mA, Low Quiescent Current, Fast Transient

Application Note

Input Capacitor

A 1μF ceramic capacitor is recommended to connect between

and GND pins to decouple input power supply glitch and

V

IN

noise. The amount of the capacitance may be increased without limit. This i nput capacitor must be located as close as possible to the device to assure input stability and less noise. For PCB layout, a wide copper trace is required for both V GND. A lower ESR capacitor allows the use of less capacitance, while higher ESR type requires more capacitance.

Output Capacitor

The output capacitor is required to stabilize and help transient response for LDO. The AP7333 is stable with very small ceramic output capacitors. The recommended capacitance is from 1μF to 4.7μF, Equivalent Series Resistance (ESR) is from 10mΩ to 200mΩ, and 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.

No Load Stability

No minimum load is required to keep the device stable. The device will remain stable and regulated in no load condition.

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 approximately 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 approximately 100mA. This feature protects the regulator from over-current and damage due to overheating.

Thermal Shutdown Protection

Thermal protection disables the output when the junction temperature rises to approximately +140°C, allowing the dev ice

and

IN

AP7333

Low Dropout Linear Regulator

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 turned on, the AP7333 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 phones and other portable devices.

Fast Transient Response

Fast transient response LDOs can also 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, enabling power savings by putting

much of the baseba nd circuitr y into standby mod e 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.

The AP7333’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 AP7333 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 AP7333.

Low Quiescent Current

The AP7333, consuming only around 65µA for all input range

and output loading, provides great power saving in portable

and low power applications.

Wide Output Options

The AP7333, with multiples of fixed output voltage options,

provides a versatile LDO solution for many portable

applications.

AP7333 Rev. 2 9 of 12 NOVEMBER 2009

Marking Information

(1) SOT23 and SOT23R

( Top View )

AP7333

300mA, Low Quiescent Current, Fast Transient

Low Dropout Linear Regulator

XX

3

Y W

XX : Identification code

Y

: Year 0~9

W

X

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

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

X

1 2

: A~Z : Green

Device Package Identification Code

AP7333-10SA SOT23 AP7333-12SA SOT23 AP7333-15SA SOT23 AP7333-18SA SOT23 AP7333-20SA SOT23 AP7333-25SA SOT23 AP7333-28SA SOT23 AP7333-30SA SOT23 AP7333-33SA SOT23 AP7333-10SR SOT23R AP7333-12SR AP7333-15SR AP7333-18SR AP7333-20SR AP7333-25SR AP7333-28SR AP7333-30SR AP7333-33SR

SOT23R RB SOT23R RC SOT23R RD SOT23R RE SOT23R RF SOT23R RG SOT23R RH SOT23R RJ

JR

JS JT

JU

JV

JW

JX JY JZ

RA

AP7333 Rev. 2 10 of 12 NOVEMBER 2009

300mA, Low Quiescent Current, Fast Transient

Package Information (All Dimensions in mm)

(1) Package Type: SOT23 and SOT23R

AP7333

Low Dropout Linear Regulator

AP7333 Rev. 2 11 of 12 NOVEMBER 2009

AP7333

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, BU T NOT LIMI TED TO, T HE IMPLIE D WARRANT IES OF ME RCHANTABILIT Y AND FI TNESS 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 Incorporated does not assume any liability arisi ng out of the application or use of this document or any product descr ibed herein; neither does Diode s Incorporated convey any license under its patent or trademark rig hts, nor the rights of othe rs. Any Customer or user of this docume nt 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, harmless against all damages.

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

1. are intended to implant into the body, or

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Customers repres ent that th ey have all necessar y expertis e in th e safety a nd regul ator y ramific ations of t heir lif e support devic es 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, notwithstandin g any devices- or systems-related i nformation or support that may be provided by Diodes Incorporated. Further, Customers must full y indemnify Diode s Incorporat ed and its represent atives ag ainst any damages ari sing out of th e use of Diodes Incorporated products in such safety-critical, life support devices or systems.

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AP7333 Rev. 2 12 of 12 NOVEMBER 2009