NCP1423: Boost Converter, Sync-Rect, PFM, DC-DC, 400 mA, 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 up to 400mA loading. 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 these functions ON, the quiescent supply current is only 9.0uA. This device is available in compact Micro-10 package

Features

High Switching Frequency, up to 600 kHz
Low Quiescent Current of 9.0 uA
Low Battery Detector
0.8 V Startup at No Load Guaranteed
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 Micro-10 Package
Pb-Free Package is Available

Applications

Wireless Optical Mouse
Wireless Headsets
Internet Audio Players
Personal Digital Assistants (PDAs)
Handheld Instruments
Conversion from one/two NiMH or NiCd cells to 1.8 V / 3.3 V

Data Sheets (1)

Document Title	Document ID/Size	Revision	Revision Date
Boost Converter, Sync-Rect, PFM, DC-DC, 400 mA, with True-Cutoff and Ring-Killer	NCP1423/D (178kB)	8

Package Drawings (1)

Document Title	Document ID/Size	Revision
C/O FOR MICRO 10 PKG	846B (30.6kB)	D

Evaluation Board Documents (4)

Document Title	Document ID/Size	Revision
NCP1423EVB Bill of Materials	NCP1423EVB_BOM.PDF (70.0kB)	2
NCP1423EVB Gerber Layout Files (Zip Format)	NCP1423EVB_GERBER.ZIP (97.0kB)	1
NCP1423EVB Schematic	NCP1423EVB_SCHEMATIC.PDF (54.0kB)	2
NCP1423EVB Test Procedure	NCP1423EVB_TEST_PROCEDURE.PDF (70.0kB)	0