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NCP1421D

600 mA Sync-Rect PFM Step-Up DC-DC Converter with True-Cutoff and Ring-Killer

ON Semiconductor 

NCP1421

600 mA Sync−Rect PFM

Step−Up DC−DC Converter

with True−Cutoff and

Ring−Killer

NCP1421 is a monolithic micropower high−frequency step−up

switching converter IC specially designed for battery−operated

hand−held electronic products up to 600 mA loading. It integrates

Sync−Rect to improve efficiency and to eliminate the external

Schottky Diode. High switching frequency (up to 1.2 MHz) allows

for a low profile, small−sized inductor and output capacitor to be

used. When the device is disabled, the internal conduction path from

LX or BAT to OUT is fully blocked and the OUT pin is isolated from

the battery. This True−Cutoff function reduces the shutdown current

to typically only 50 nA. Ring−Killer is also integrated to eliminate

the high−frequency ringing in discontinuous conduction mode. In

addition to the above, Low−Battery Detector, Logic−Controlled

Shutdown, Cycle−by−Cycle Current Limit and Thermal Shutdown

provide value−added features for various battery−operated

applications. With all these functions on, the quiescent supply

current is typically only 8.5 mA. This device is available in the

compact and low profile Micro8t package.

Features

• Pb−Free Package is Available

• High Efficiency: 94% for 3.3 V Output at 200 mA from 2.5 V Input

88% for 3.3 V Output at 500 mA from 2.5 V Input

• High Switching Frequency, up to 1.2 MHz (not hitting current limit)

• Output Current up to 600 mA at VIN = 2.5 V and VOUT = 3.3 V

• True−Cutoff Function Reduces Device Shutdown Current to

typically 50 nA

• Anti−Ringing Ring−Killer for Discontinuous Conduction Mode

• High Accuracy Reference Output, 1.20 V $1.5%, can Supply

2.5 mA Loading Current when VOUT > 3.3 V

• Low Quiescent Current of 8.5 mA

• Integrated Low−Battery Detector

• Open Drain Low−Battery Detector Output

• 1.0 V Startup at No Load Guaranteed

• Output Voltage from 1.5 V to 5.0 V Adjustable

• 1.5 A Cycle−by−Cycle Current Limit

• Multi−function Logic−Controlled Shutdown Pin

• On Chip Thermal Shutdown with Hysteresis

Typical Applications

• Personal Digital Assistants (PDA)

• Handheld Digital Audio Products

• Camcorders and Digital Still Cameras

• Hand−held Instruments

• Conversion from one to two Alkaline, NiMH, NiCd Battery Cells to

3.0−5.0 V or one Lithium−ion cells to 5.0 V

• White LED Flash for Digital Cameras

http://onsemi.com

8

1

MARKING

DIAGRAM

Micro8

DM SUFFIX

CASE 846A

1421

AYW

1421

A

Y

W

= Device Code

= Assembly Location

= Year

= Work Week

PIN CONNECTIONS

FB 1

LBI/EN 2

LBO 3

REF 4

8 OUT

7 LX

6 GND

5 BAT

(Top View)

ORDERING INFORMATION

Device

Package

Shipping†

NCP1421DMR2

Micro8 4000 Tape & Reel

NCP1421DMR2G Micro8 4000 Tape & Reel

(Pb−Free)

†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.

© Semiconductor Components Industries, LLC, 2004

1

October, 2004 − Rev. 6

Publication Order Number:

NCP1421/D

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