Features

Applications

General Description

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Efficiency up to 96%

Only 40 A(TYP.) Quiescent Current

Output Current: Up to 1A

Internal Synchronous Rectifier

1.5MHz Switching Frequency

Soft Start

Under-Voltage Lockout

Short Circuit Protection

Thermal Shutdown

5-pin Small SOT23-5 Packages

Cellular Phone

Portable Electronics

Wireless Devices

Cordless Phone

Computer Peripherals

Battery Powered Widgets

Electronic Scales

Digital Frame

The PAM2312 is a step-down current-mode, DC-

DC converter. 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. To ensure the

longest battery life in portable applications, the

PA M 2 3 1 2 p r o v i d e s a p o w e r - s a v i n g P u l s e -

Skipping Modulation (PSM) mode to reduce

quiescent current under light load operation to

save power.

The PAM2312 supports a range of input voltages

from 2.5V to 5.5V, allowing the use of a single

Li+/Li-polymer cell, multiple Alkaline/NiMH cell,

USB, and other standard power sources. The

output voltage is adjustable from 0.6V to the input

voltage, while the part number suffix PAM2312-

XX indicates pre-set output voltage of 3.3V, 2.8V,

2.5V, 1.8V, 1.5V, 1.2V or adjustable. All versions

employ internal power switch and synchronous

rectifierfor to minimize external part count and

realize high efficiency. During shutdown, the input

is disconnected from the output and the shutdown

current is less than 1 A. Other key features

include under-voltage lockout to prevent deep

battery discharge.

The PAM2312 is available in SOT23-5 packages.

μ

μ

Pb-Free Package

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Typical Application

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www.poweranalog.com

PAM2312

1A Step-Down DC-DC Converter

Fixed Output Voltage

Adjustable Output Voltage

05/2010 Rev1.0

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Power Analog Microelectronics Inc

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0.6

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2

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VIN

SW

VOUT

/FB

GND

EN

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Co

10µF

V

C

10µF

IN

IN

VIN

SW

GND

EN

VOUT/FB

L

Vo

Co

10µF

V

C

IN

IN

10µF

C

FW

R1

R2