LM2657 - 双路同步降压稳压器控制器

LM2657是TI德州仪器公司的一款控制器（外部开关）产品，LM2657是双路同步降压稳压器控制器，本站介绍了LM2657的封装应用图解、特点和优点、功能等，并给出了与LM2657相关的TI元器件型号供参考。

LM2657 - 双路同步降压稳压器控制器 - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品描述

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 high-efficiency 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 outputs switch 180° out of phase (interleaved switching) reducing the input capacitor and filter requirements. The input voltage range is 4.5V to 28V while the output voltages are adjustable down to 0.6V.

Standard supervisory and control features include Soft-start, Power Good, output Under-voltage and Over-voltage protection, Under-voltage Lockout, and chip Enable.

产品特性

Input Voltage Range from 4.5V to 28V
Synchronous Dual-Channel Interleaved Switching
Forced-PWM or Pulse-Skip Modes
Lossless Bottom-Side FET Current Sensing
Adaptive Duty Cycle Clamp
High Current N-Channel FET Drivers
Low Shutdown Supply Current
Reference Voltage Accurate to within ±1.5%
Output Voltage Adjustable Down to 0.6V
Power Good Flag and Chip Enable
Under-Voltage Lockout
Over-Voltage/Under-Voltage Protection
Soft-Start
Switching Frequency Adjustable 200kHz-500kHz
28-Pin TSSOP Package

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