NCP1423 datasheet(1/13 Pages) ONSEMI

Teilenummer	NCP1423

Bauteilbeschribung	400 mA Sync?뭃ect PFM Step?뭊p DC?묭C Converter with True?묬utoff and Ring?묷iller

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Hersteller	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

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October, 2006 − Rev. 5

1

Publication Order Number:

NCP1423/D

NCP1423

400 mA Sync−Rect PFM

Step−Up DC−DC Converter

with True−Cutoff and

Ring−Killer

NCP1423 is a monolithic micropower high frequency step−up

switching converter IC specially designed for battery operated

hand−held electronic products. It integrates Synchronous Rectifier for

improving efficiency as well as eliminating the external Schottky

Diode. High switching frequency (up to 600 kHz) allows low profile

inductor and output capacitor being used. When the IC is disabled,

internal conduction path from LX or BAT to OUT is blocked, OUT pin

is isolated from the battery. This achieves True−Cutoff. Ring−Killer is

also integrated to eliminate the high frequency ringing in discontinuous

conduction mode. Low−Battery Detector, Cycle−by−Cycle Current

Limit, Overvoltage Protection and Thermal Shutdown provide

value−added features for various battery operated application. With all

of these functions ON, the quiescent supply current is only 9.0

mA. This

device is available in compact Micro10 package.

Features

• High Efficiency: 92% for 3.3 V Output@ 400 mA from 2.5 V Input

87% for 1.8 V Output@ 70 mA from 1.2 V Input

• High Switching Frequency, up to 600 kHz (not hitting current limit)

• Low Quiescent Current of 9.0 mA

• Low Battery Detector

• 0.8 V Startup

• External Adjustable Output Voltage

• ±1.5% Output Voltage Accuracy

• Ring−Killer for Discontinuous Conduction Mode

• Thermal Shutdown

• 1.2 A Cycle−by−Cycle Current Limit

• Output Current up to 400 mA @ VOUT = 3.3 V,

200 mA @ VOUT = 1.8 V

• Overvoltage Protection

• Low Profile and Minimum External Part

• Open Drain Low−Battery Detector Output

• Compact Micro10 Package

• Pb−Free Package is Available

Typical Applications

• Wireless Optical Mouse

• Wireless Headsets

• Internet Audio Players

• Personal Digital Assistants (PDAs)

• Hand−held Instruments

• Conversion from one/two NiMH or NiCd cells to 1.8 V / 3.3 V

PIN CONNECTIONS

Device

Package

Shipping†

ORDERING INFORMATION

NCP1423DMR2

Micro10

4000 Tape & Reel

http://onsemi.com

MARKING

DIAGRAM

DAR

= Device Code

A

= Assembly Location

Y

= Year

W

= Work Week

G

= Pb−Free Package

(Top View)

Micro10

DM SUFFIX

CASE 846B

EN

LBO

REF

FB

OUT

LBI

ADEN

BAT

GND

LX

1

2

3

4

5

10

9

8

7

6

Micro10

†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.

DAR

AYW

G

NCP1423DMR2G

Micro10

(Pb−Free)

4000 Tape & Reel

(Note: Microdot may be in either location)

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