© Semiconductor Components Industries, LLC, 2006

July, 2006 − Rev. 0

1

Publication Order Number:

NCP1526/D

NCP1526

400 mA, 1.2 V,

High−Efficiency, Step−Down

Converter with Low Noise

Voltage Regulator

Optimized for RF Module

The NCP1526 product is a monolithic integrated circuit combining

step−down PWM DC−DC converter dedicated to the portable

applications powered from one cell Li−ion or three cell Alkaline/

NiCd/NiMH batteries and a low noise output voltage regulator

dedicated to supply RF sensitive module in the portable applications.

The DC−DC converter operates with a fixed output voltage of

1.2 V and delivers up to 400 mA. It uses synchronous rectification to

increase efficiency and reduces external part count. The device also

has a built−in 3.0 MHz (nominal) oscillator which reduces

component size by allowing small inductor and capacitors. It

includes an integrated soft−start, cycle−by−cycle current limiting,

and thermal shutdown protection.

The additional 2.80 V very low noise, low drop output regulator, is

available with 150 mA current capability, current limitation and

overtemperature protection.

Finally, the NCP1526 is available in a space saving, ultra low

profile 3x3 mm 10 pin UDFN package (thickness 0.55 mm max).

Features

− Up to 85% Efficiency

− Output Current Capability 400 mA

− 3.0 MHz Switching Frequency

− 1.2 V Fixed Output Voltage

− Synchronous Rectification for Higher Efficiency

− 2.80 V Output Voltage

− Up to 150 mA Output Current Capability

− Very Low Noise: 45

Typical Applications

10 PIN DFN

MU SUFFIX

CASE 506AT

PIN CONNECTIONS

Device

Package

ORDERING INFORMATION

NCP1526MUTXG

UDFN−10

(Pb−Free)

3000/Tape & Reel

http://onsemi.com

MARKING

DIAGRAM

1526

= Specific Device Code

A

= Assembly Location

L

= Wafer Lot

Y

= Year

W

= Work Week

G

= Pb−Free Package

1526

ALYWG

G

FB

EN1

EN2

GND2

BYPASS

VIN1

LX

GND1

VIN2

V1

(Top View)

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specification

Brochure, BRD8011/D.

(Note: Microdot may be in either location)