NCP1597BMNTXG datasheet(1/9 Pages) ONSEMI

Part #	NCP1597BMNTXG

Description	1 MHz, 2 A Synchronous Buck Regulator

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Manufacturer	ONSEMI [ON Semiconductor]

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October, 2009 − Rev. P0

1

Publication Order Number:

NCP1597B/D

NCP1597B

Product Preview

1 MHz, 2 A Synchronous

Buck Regulator

The NCP1597B is a fixed 1 MHz, high−output−current,

synchronous PWM converter that integrates a low−resistance,

high−side P−channel MOSFET and a low−side N−channel MOSFET.

The NCP1597B utilizes current mode control to provide fast transient

response and excellent loop stability. It regulates input voltages from

4.0 V to 5.5 V down to an output voltage as low as 0.8 V and is able to

supply up to 2 A.

The NCP1597B has features including fixed internal switching

frequency (FSW), and an internal soft−start to limit inrush current.

Using the EN pin, shutdown supply current is reduced to 3

mA

maximum.

Other features include cycle−by−cycle current limiting;

short−circuit protection, low dropout mode, power saving mode and

thermal shutdown.

Features

• Input Voltage Range: from 4.0 V to 5.5 V

• Internal 140 mW High−Side Switching P−Channel MOSFET and

90 m

W Low−Side N−Channel MOSFET

• Fixed 1 MHz Switching Frequency

• Cycle−by−Cycle Current Limiting

• Overtemperature Protection

• Internal Soft−Start

• Start−up with Pre−Biased Output Load

• Adjustable Output Voltage Down to 0.8 V

• Power Saving Mode During Light Load

• Low Dropout Mode Operation to Extend the Battery Life

• These are Pb−Free Devices

Applications

• DSP Power

• Hard Disk Drivers

• Computer Peripherals

• Home Audio

• Set−Top Boxes

• Networking Equipment

• LCD TV

• Wireless and DSL/Cable Modem

• USB Power Devices

This document contains information on a product under development. ON Semiconductor

reserves the right to change or discontinue this product without notice.

Device

Package

Shipping†

ORDERING INFORMATION

NCP1597BMNTWG

DFN10

(Pb−Free)

3000 / Tape &

Reel

NCP1597BMNTXG

DFN10

(Pb−Free)

DFN10

CASE 485C

3000 / Tape &

Reel

MARKING

DIAGRAM

http://onsemi.com

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.

PGND

LX

EN

VCC

VCCP

1

2

3

10

9

8

(Top View)

PIN CONNECTIONS

1597B = Specific Device Code

A

= Assembly Location

L

= Wafer Lot

Y

= Year

W

= Work Week

G

= Pb−Free Package

1597B

ALYWG

G

(Note: Microdot may be in either location)

LX

AGND 4

7

NC

FB 5

6

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