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LM2631 - Synchronous Step-Down Power Supply Controller

General Description

The LM2631 controller provides all the active functions for step-down (buck) switching converters.

These dc-to-dc converters provide core CPU power in battery-operated systems.

High efficiency is achieved by using synchronous rectification and pulse-skipping mode operation at light load.

Key Features

  • include the external synchronization pin, and the PGOOD pin to indicate the state of the output voltage. Protection circuitry includes thermal shutdown, undervoltage and overvoltage shutdown protection, soft-start capability, and two levels of current limits: The first level simply limits the load current directly; at the second level, if the load pulls the output voltage down below 80% of the regulated value, the chip will shut down. This operation is disabled during startup, but an internal ti.

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LM2631 Synchronous Step-Down Power Supply Controller April 1999 LM2631 Synchronous Step-Down Power Supply Controller General Description The LM2631 controller provides all the active functions for step-down (buck) switching converters. These dc-to-dc converters provide core CPU power in battery-operated systems. High efficiency is achieved by using synchronous rectification and pulse-skipping mode operation at light load. Inexpensive N-channel MOSFETs are used to reduce system cost. Bootstrap circuit is used to drive the high-side N-channel MOSFET. Current mode control scheme is used to improve line regulation and transient response, also provides cycle-by-cycle current limiting. The operating frequency is adjustable between 200 kHz and 400 kHz.