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)