Features

Applications

Description

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Output Current: Up to 3A

Output Voltage: 0.6V to V

Input Voltage: 2.7 to 5.5V

Efficiency up to 95%

42 A (Typ) No Load Quiescent Current

Shutdown Current: <1 A

100% Duty Cycle Operation

1.5MHz Switching Frequency

Analog Soft Start

No external Compensation Required

Current Limit Protection

Thermal Shutdown

SOP-8(EP), DFN3X3-10 and QFN3X3-16

Package

5V or 3.3V Point of Load Conversion

Telecom/Networking Equipment

Set Top Boxes

Storage Equipment

Video Cards

DDR Power Supply

T h e PA M 2 3 0 3 i s a 3 A s t e p - d o w n D C - D C

converter. It operates in two different modes:

P S M a n d P W M m o d e s . A t l i g h t l o a d , i t

automactically enters into the PSM mode to

improve efficiency. At heavy load, the constant-

f re q u e n cy P WM co n t ro l p e r fo r m s e xc e lle n t

stability and transient response. No external

compensation components are required

The PAM2303 supports a range of input voltages

f r o m 2 . 7 V t o 5 . 5 V. T h e o u t p u t v o lt a g e is

adjustable from 0.6V to the input voltage. The

PAM2303 employs internal power switch and

synchronous rectifier to minimize external part

c o u n t a n d r e a l i z e h i g h e f f i c i e n c y. D u r i n g

shutdown, the input is disconnected from the

output and the shutdown current is less than 1 A.

Other key features include over-temperature and

sh o r t c ir c u it p r o t e c t i o n , a n d u n d e r -v o l t a g e

lockout to prevent deep battery discharge.

The PAM2303 delivers 3A maximum output

current while consuming only 42 A of no-load

quiescent current. Ultra-low RDS(ON) integrated

MOSFETs and 100% duty cycle operation make

the PAM2303 an ideal choice for high output

voltage, high current applications which require a

low dropout threshold.

T h e PA M 2 3 0 3 i s a v a i l a b l e i n S O P - 8 ( E P ) ,

DFN3X3-10, and QFN3X3-16 package.

IN

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Typical Application

1

www.poweranalog.com

11/2011 Rev1.2

,

Power Analog Microelectronics Inc

PAM2303

3A Low Noise Step-Down DC-DC Converter

1

0.6

1

2

O

R

V

R





=

 +









U1

PAM23 07

PVIN

VIN

EN

TEST

SW

F B

C1

C 2

L1

1

2

R1

R 2

C3

100pF

R 3

1k

C4

1uF

22uF

22uF

VIN

VOUT

30uF

PAM2303

40uF