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 A. 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 A

• 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

• SCV Prefix for Automotive and Other Applications Requiring

Unique Site and Control Change Requirements; AEC−Q100

Qualified and PPAP Capable

• These Devices are Pb−Free and are RoHS Compliant

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