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LM2640 - Dual Adjustable Step-Down Switching Power-Supply Controller

General Description

The LM2640 is a dual step-down power supply controller intended for application in notebook personal computers and other battery-powered equipment.

Key Features

  • n 200 kHz fixed-frequency switching n Switching synchronization with an external signal up to 400 kHz n Optional pulse-skipping mode n Adjustable secondary feedback n Input undervoltage lockout n Output undervoltage shutdown protection n Output overvoltage shutdown protection n Programmable soft-start (each controller) n 5V, 50 mA linear regulator output n Precision 2.5V reference output n 28-pin TSSOP.

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📁 Similar Datasheet

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LM2640 Dual Adjustable Step-Down Switching Power Supply Controller Texas Instruments
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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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LM2640 Dual Adjustable Step-Down Switching Power Supply Controller December 1998 LM2640 Dual Adjustable Step-Down Switching Power Supply Controller General Description The LM2640 is a dual step-down power supply controller intended for application in notebook personal computers and other battery-powered equipment. Fixed-frequency synchronous drive of logic-level N-channel power MOSFETs is combined with an optional pulse-skipping mode to achieve ultra efficient power conversion over a 1000:1 load current range. The pulse-skipping mode can be disabled in favor of fixed-frequency operation regardless of the load current level. High DC gain and current-mode feedback control assure excellent line and load regulation and a wide loop bandwidth for fast response to dynamic loads.