LM2636 Datasheet 5-bit Programmable Synchronous Buck Regulator Controller

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: LM2636 5-Bit Programmable Synchronous Buck Regulator Controller October 1999 LM2636 5-Bit Programmable Synchronous Buck Regulator.

Datasheet Details

Part number	LM2636
Manufacturer	National Semiconductor (now Texas Instruments)
File Size	325.31 KB
Description	5-Bit Programmable Synchronous Buck Regulator Controller
Datasheet	LM2636_NationalSemiconductor.pdf

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

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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