Datasheet

EL7571
Programmable PWM Controller

Overview
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Typical Diagram

Key Features

Pentium® II Compatible
5 bit DAC Controlled Output Voltage
Greater than 90% Efficiency
4.5V to 12.6V Input Range
Dual NMOS Power FET Drivers
Fixed frequency, Current Mode Control
Adjustable Oscillator with External Sync. Capability
Synchronous Switching
Internal Soft-Start
User Adjustable Slope Compensation
Pulse by Pulse Current Limiting
1% Typical Output Accuracy
Power Good Signal
Output Power Down
Over Voltage Protection
Pb-Free Available (RoHS Compliant)

Description

The EL7571 is a flexible, high efficiency, current mode, PWM step down controller. It incorporates five bit DAC adjustable output voltage control which conforms to the Intel Voltage Regulation Module (VRM) Specification for Pentium® II and Pentium® Pro class processors. The controller employs synchronous rectification to deliver efficiencies greater than 90% over a wide range of supply voltages and load conditions. The on-board oscillator frequency is externally adjustable, or may be slaved to a system clock, allowing optimization of RFI performance in critical applications. In single supply operation, the high side FET driver supports boot-strapped operation. For maximum flexibility, system operation is possible from either a 5V rail, a single 12V rail, or dual supply rails with the controller operating from 12V and the power FETs from 5V.