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NCP1423EVB:  400 mA DC-DC Converter Evaluation Board

The 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 a low profile inductor and output capacitor to be used. When the IC is disabled the internal conduction path from pin LX or BAT to pin OUT is blocked. The OUT pin is isolated from the battery, which 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 a compact Micro10 package.

Features and Applications


  • High Efficiency:
    o 92% for 3.3 V Output @ 400 mA from 2.5 V Input
    o 89% for 1.8 V Output @ 100 mA from 1.2 V Input
  • 0.8 V Startup at No Load Guaranteed
  • External Adjustable Output Voltage
  • ±1.5% Output Voltage Accuracy
  • Open Drain Low Battery Detector Output
  • Output Current up to 400 mA at VOUT = 3.3 V, 200 mA at VOUT = 1.8 V
  • Pb Free Package is Available
Evaluation/Development Tool Information
Product Status Compliance Short Description Parts Used Action
NCP1423EVB Active
400 mA DC-DC Converter Evaluation Board NCP1423DMR2G
Technical Documents
Type Document Title Document ID/Size Rev
Eval Board: BOM NCP1423EVB Bill of Materials NCP1423EVB_BOM.PDF - 70.0 KB  2 
Eval Board: Gerber NCP1423EVB Gerber Layout Files (Zip Format) NCP1423EVB_GERBER.ZIP - 97.0 KB  1 
Eval Board: Schematic NCP1423EVB Schematic NCP1423EVB_SCHEMATIC.PDF - 54.0 KB  2 
Eval Board: Test Procedure NCP1423EVB Test Procedure NCP1423EVB_TEST_PROCEDURE.PDF - 70.0 KB  0 
Video 400 mA DC-DC Converter Evaluation Board - NCP1423EVB WVD17550/D   
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400 mA DC-DC Converter Evaluation Board - NCP1423EVB
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