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LM2640
www.ti.com SNVS019B – DECEMBER 1998 – REVISED APRIL 2013 LM2640 Dual Adjustable Step-Down Switching Power Supply Controller
Check for Samples: LM2640 FEATURES DESCRIPTION The LM2640 is a dual step-down power supply
controller intended for application in notebook
personal computers and other battery-powered
equipment. 1 2 200 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 Package APPLICATIONS Notebook and Subnotebook Computers
Wireless Data Terminals
Battery-Powered Instruments KEY SPECIFICATIONS 96% Efficient
5.5V to 30V Input Range
Dual Outputs Adjustable from 2.2V to 6V
0.5% Typical Load Regulation Error
0.002%/V Typical Line Regulation Error Fixed-frequency synchronous drive of logic-level Nchannel power MOSFETs is combined with an …
