LM2640 Dual Adjustable Step-Down Switching Power-Supply Controller

LM2640 Dual Adjustable Step-Down Switching Power-Supply Controller

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 pow.

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 Applications n Notebook and subnotebook computers n Wireless data terminals n Battery-powered instruments Connection Diagram and Ordering Information 28-Lead TSSOP (MTC) DS100148-1 Top View .