LM2640中文资料具有 LDO 的 5.5V 至 30V、200kHz 同步 D-CAP2 模式双路降压控制器数据手册TI规格书

描述 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.

An internal oscillator fixes the switching frequency at 200 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.

特性 Features

• 200 kHz Fixed-Frequency Switching
• Optional Pulse-Skipping Mode
• Input Undervoltage Lockout
• Output Overvoltage Shutdown Protection
• 5V, 50 mA Linear Regulator Output
• 28-Pin Package
• 96% Efficient
• Dual Outputs Adjustable from 2.2V to 6V
• 0.002%/V Typical Line Regulation Error