General  Description

The APW7138 is a single-phase, constant-on-time, and synchronous PWM controller which drives N-channel MOSFET s. The APW7138 steps down high voltage of a battery to generate low-voltage chipset or RAM supplies in notebook computers.

Features

• Adjustable Output V oltage  from +0.6V  to +3.3V

- 0.6V Reference V oltage

- –1% Accuracy Over T emperature

• Operates from an  Input  Battery V oltage Range  of +3V to +25V

• Wide  Output  Load  Range from 0A to  25A

• Power-On-Reset  Monitoring  on  VCC  Pin

• Excellent  Line and Load Transient Response

• PFM Mode  for  Increased Light Load Efficiency

• Programmable PWM Frequency from 200kHz to 600kHz

• Integrated  MOSFET  Drivers  and  Bootstrap  Diode

• Internal Integrated Soft-Start  and Soft-Stop

• Selectable Forced PWM or  Automatic PFM/PWM Mode  (onl y  for  QF N4x4-16A  and  TQF N3x3-16 Packages)

• Power  Good  Monitoring

• Fault  Identification  by  PGOOD  Pull-Down Resistance

• 70% Under-V oltage  Protection  (UVP)

• 124% Over-V oltage Protection (OVP)

• Adjustable Over-Current Protection (OCP)

-  Sensing  Low-Side  MOSFET’ s  Current

• Over-T emperature Protection (OTP)

• SSOP-16,  Compact  4mmx4mm  QF N-16 (QF N4x4-16A), and TQF N3x3-16 Packages

• Lead Free and Green Devices Available (RoHS Compliant)