Features

Applications

General Description

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2A Maximum Output Current

Tiny 0.47uH Chip Inductor

Excellent Transient Response

Input Voltage: 2.7V to 5.5V

Fixed or Adjustable Output Voltage

Options:

- Fixed Output Voltage: 1.2V

- Adjustable Output Voltage: 1.0V to Vin

High Efficiency with 3MHz Switching

Frequency

1uA Shutdown Current

-40°C to 85°C Temperature Range

Pb-Free/Halogen Free Package

RoHS/REACH Compliant

Cellular Phone

Digital Cameras

Hard Disk Drives

MP3 Players

PDAs and Handheld Computers

Portable Media Players

USB Devices

Wireless Network Cards

The PAM2321 is a 2A step-down converter with a

typical input voltage of 3.3V and a fixed output

voltage of 1.2V or an adjustable output. The 3MHz

switching frequency enables the use of small

external components. The ultra-small 3mm x 3mm

footprint and high efficiency make the PAM2321

an ideal choice for portable applications.

The

PAM2321

delivers

A

maximum

output

current while

consuming

only

55uA

no load

quiesce nt

cu rre nt.

Lo w

R

inte grate d

MOSFETs and 100

duty cycle operation make

the PAM2321 the ideal choice for high output

voltage, high current applications which require a

low dropout threshold

T h e PAM 2 3 2 1 p r o v id e s e x c e l le n t t r a n s ie n t

r e s p o n s e a n d o u t p u t a c c u r a c y a c r o s s t h e

operating range.

T h e

PA M 2 3 2 1

m a i n t a i n s h i g h

e f f i c i e n c y

t h r o u g h o u t t h e l o a d r a n g e . T h e PA M 2 3 2 1

automatically optimizes efficiency during light

l o a d m o d e ( P S M ) a n d m a i n t a i n s c o n s t a n t

frequency and low output ripple during PWM

mode.

Over-temperature and short circuit protection

safeguard the PAM2321 and system components

from damage.

The PAM2321 are available in Pb-free, ultra-

small, low profile, TDFN3X3-10 packages. The

product is rated over a temperature range of -

40°C to 85°C.

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55uA No Load Quiescent Current

100% Duty Cycle Low-Dropout Operation

Internal Soft Start

Over-Temperature and Current Limit

Protection

<

-

%

.

2

DS( ON)

Typical Application

1

www.poweranalog.com

PAM2321

3MHz,Fast Transient 2A Step-Down Converter

,

Power Analog Microelectronics Inc

C3

1.0µF

PVIN

EN

VIN

AGND

PGND

FB

SW

SW

Vin

L1

0.47uH

C1

10µF

C2

10µF

Vout

Cfw

100pF

R1

R2

Vout=0.6* (1+R1/R2)

01/2013 Rev1.2