Diodes Incorporated
SO 8

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AP3431M (Obsolete)

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The AP3431 is a high efficiency step-down DC-DC voltage converter. The chip operation is optimized by peak-current mode architecture with built-in synchronous power MOS switchers. The oscillator and timing capacitors are all built-in providing an internal switching frequency of 1MHz that allows the use of small surface mount inductors and capacitors for portable product implementations. Integrated Soft Start (SS), Under Voltage Lock Out (UVLO), Thermal Shutdown Detection (TSD) and short circuit protection are designed to provide reliable product applications. The device is available in adjustable output voltage versions ranging from 0.8V to 0.9μVIN when input voltage range is from 2.7V to 5.5V , and is able to deliver up to 2.0A. The AP3431 is available in SOIC-8 package.


  • LCD TV
  • Set Top Box
  • Post DC-DC Voltage Regulation
  • PDA and Notebook Computer

Product Specifications

Product Parameters

Efficiency (%) 95
Frequency Typ (Hz) 1000
HS RDS(ON) (mΩ) 120
LS RDS(ON) (mΩ) 120
MaximumInput Voltage (V) 5.5
MinimumInput Voltage (V) 2.7
Output Current (mA) 3
Output Voltage (V) ADJ
Quiescent Current Typ (mA) 0.46
Shutdown Current Typ (µA) 4
Type Buck

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