LM2636 - 5-Bit Programmable Synchronous Buck Regulator Controller

Product Overview

National Semiconductor

Part number	LM2636
Manufacturer	National Semiconductor
File Size	325.31 KB
Description	5-Bit Programmable Synchronous Buck Regulator Controller
Datasheet	LM2636 Datasheet
Additional preview pages of the LM2636 datasheet.

The LM2636 is a high speed controller designed specifically for use in synchronous DC/DC buck converters for advance d microprocessors.

A 5-bit DAC accepts the VID code directly from the CPU and adjusts the output voltage from 1.3V to 3.5V.

as required by Intel VRM specifications. Current limiting is achieved by monitoring the voltage drop across the rDS_ON of the high side MOSFET, which eliminates an expensive current sense resistor. The LM2636 employs a fixed-frequency voltage mode PWM architecture. To provide a faster response to a large and fast load transient, two ultra-fast comparators are built in to monitor the output voltage and override the primary control loop when necessary. The PWM frequency is adjustable from 50 kHz t.

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Published: Mar 22, 2005 |