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LM2657 - Dual Synchronous Buck Regulator Controller

Description

The LM2657 is an adjustable 200kHz-500kHz dual channel voltage-mode controlled high-speed synchronous buck regulator controller ideally suited for high current applications.

The LM2657 requires only N-channel FETs for both the upper and lower positions of each stage.

Features

  • line feedforward to improve the response to input transients. At very light loads, the user can choose between the highefficiency Pulse-skip mode or the constant frequency Forced-PWM mode. Lossless current limiting without the use of external sense resistors is made possible by sensing the voltage drop across the bottom FET. A unique adaptive duty cycle clamping technique is incorporated to significantly reduce peak currents under abnormal load conditions. The two independently programmable outp.

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Datasheet Details

Part number LM2657
Manufacturer National Semiconductor
File Size 959.89 KB
Description Dual Synchronous Buck Regulator Controller
Datasheet download datasheet LM2657 Datasheet
Additional preview pages of the LM2657 datasheet.

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LM2657 Dual Synchronous Buck Regulator Controller January 2005 LM2657 Dual Synchronous Buck Regulator Controller General Description The LM2657 is an adjustable 200kHz-500kHz dual channel voltage-mode controlled high-speed synchronous buck regulator controller ideally suited for high current applications. The LM2657 requires only N-channel FETs for both the upper and lower positions of each stage. It features line feedforward to improve the response to input transients. At very light loads, the user can choose between the highefficiency Pulse-skip mode or the constant frequency Forced-PWM mode. Lossless current limiting without the use of external sense resistors is made possible by sensing the voltage drop across the bottom FET.
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