uP1728

1

uP1728-DS-F0000, Dec. 2012

www.upi-semi.com

Adjustable Output from 0.6V to V

IN

Guaranteed 3.0A Output Current

Accurate Reference: 0.6V (+1%)

Up to 95% Conversion Efficiency

Low Quiescent Current

Integrated Low R

Switches: 80mΩ

Ω

Ω

Ω

Ω

and 60mΩ

Ω

Ω

Ω

Ω

Current Mode PWM Operation

Fixed Frequency : 1.2MHz

100% Maximum Duty Cycle for Lowest Dropout

Internal Soft-Start

Over Voltage and Under Voltage Protection

Over Temperature and Over Current Protection

WDFN3x3-10L Package

RoHS Compliant and Halogen Free

r

e

b

m

u

N

r

e

d

r

Oe

p

y

T

e

g

a

k

c

a

Pg

n

i

k

r

a

M

p

o

T

A

D

D

P

8

2

7

1

P

uL

0

1

-

3

x

3

N

F

D

WP

8

2

7

1

P

u

1.2MHz, 3.0A, High-Efficiency

Synchronous-Rectified Buck Converter

Battery-Powered Portable Devices

MP3 Players

Notebook Computers

Wireless and DSL Modems

Personal Information Appliances

IP Phones

Digital Cameras

802.11 WLAN Power Supplies

FPGA/ASIC Power Supplies

Dynamically Adjustable Power Supply for

CDMA/WCDMA Power Amplifiers

USB-Based xDSL Modems and Other Network

Interface Cards

Point-of-Load Regulation

General Description

Applications

Ordering Information

Features

RoHS compliant and 100% matte tin (Sn) plating that are

suitable for use in SnPb or Pb-free soldering processes.

The uP1728 is a high efficiency synchronous-rectified buck

converter with internal power switches. Fixed 1.2MHz

PWM operation allows possible smallest output ripple and

external component size. With high conversion efficiency

and small package, the uP1728 is ideally suitable for

portable devices and USB/PCIE-based interface cards,

where PCB area is especially concerned.

of delivering 3.0A output current over a wide input voltage

range from 2.6V to 5.5V. The output voltage is adjustable

Other features include internal soft-start, chip enable, over-

voltage, under-voltage, over-temperature and over-current

protections. The uP1728 is available in a space-saving

WDFN3x3-10L package.

Pin Configuration

POK

MODE

EN

LX

FB

VDD

VIN

GND

GND

1

2

3

4

10

9

8

7

WDFN3x3-10L

LX

6