LM2641 - 双路可调节降压开关电源控制器

LM2641是TI德州仪器公司的一款控制器（外部开关）产品，LM2641是双路可调节降压开关电源控制器，本站介绍了LM2641的封装应用图解、特点和优点、功能等，并给出了与LM2641相关的TI元器件型号供参考。

LM2641 - 双路可调节降压开关电源控制器 - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The LM2641 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.

An internal oscillator fixes the switching frequency at 300 kHz. Optionally, switching can be synchronized to an external clock running as fast as 400 kHz.

An optional soft-start feature limits current surges from the input power supply at start up and provides a simple means of start-up sequencing.

Logic-level inputs allow the controllers to be turned ON and OFF separately.

产品特性

300 kHz Fixed-Frequency Switching
Switching Synchronization with an External Signal up to 400 kHz
Optional Pulse-Skipping Mode
Adjustable Secondary Feedback
Input Undervoltage Lockout
Output Undervoltage Shutdown Protection
Output Overvoltage Shutdown Protection
Programmable Soft-Start (Each Controller)
5V, 50 mA Linear Regulator Output
Precision 2.5V Reference Output
28-pin TSSOP

Key Specifications

96 % Efficient
5.5 – 30 V Input Range
Dual Outputs Adjustable from 2.2 – 8 V
0.5 % Typical Load Regulation Error
0.002 %/V Typical Line Regulation Error

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