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LM2636 - 5-Bit Programmable Synchronous Buck Regulator Controller

Datasheet Summary

Description

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.

Features

  • 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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Datasheet Details

Part number LM2636
Manufacturer National Semiconductor
File Size 325.31 KB
Description 5-Bit Programmable Synchronous Buck Regulator Controller
Datasheet download datasheet LM2636 Datasheet
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Full PDF Text Transcription

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LM2636 5-Bit Programmable Synchronous Buck Regulator Controller October 1999 LM2636 5-Bit Programmable Synchronous Buck Regulator Controller General Description 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. It provides the power good, over-voltage protection, and output enable features 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.
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