NCP81038AMNTWG Description

NCP81038AMNTWG is a dual synchronous buck controller that is optimized for converting the battery voltage or adaptor voltage into multiple power rails required in desktop and notebook systems. NCP81038AMNTWG consists of two buck switching controllers with fixed 5.0 V output on channel 2, 3.3 V on channel 1, and two on-board LDOs with three outputs: 5 V /60 mA and 3.3 V or 12 V / 10 mA. NCP81038AMNTWG supports high efficiency, fast transient response, and provides power good signals. ON Semiconductor's proprietary adaptive-ripple control enables a seamless transition from CCM to DCM, where the converter runs at a reduced switching frequency with much higher efficiency at light load. The part operates with supply voltage ranging from 5.5 V to 28 V. NCP81038AMNTWG is available in a 28- -pin QFN package.

NCP81038AMNTWG Features

Wide Input Voltage Range: from 5.5 V to 28 V

Built- -in5 V / 60 mA LDO

Built-in selectable 3.3 V or 12 V / 10 mA LDO

Three Selectable Fixed Frequency 300 kHz, 400 kHz, or 600 kHz.

180 Interleaved Operation Between the Two Channels in

Continue-Conduction-Mode (CCM)

Selected Power-Saving Mode/Forced PWM Mode

Transient-Response-Enhancement (TRE) Control

Input Supply Voltage Feed Forward Control

Resistive or Lossless Inductor's DCR Current Sensing

Over- -Temperature Protection

Internal Fixed 8.5 ms Soft- -Start

Fixed Output Voltages5 V and 3.3 V

NCP81038AMNTWG Applications

Desktop / Notebook Computers

System Power Supplies

I/O Power Supplies

Personal electronics 

Portable electronics