LM2640
LM2640 is Dual Adjustable Step-Down Switching Power-Supply Controller manufactured by National Semiconductor.
LM2640 Dual Adjustable Step-Down Switching Power Supply Controller
December 1998
LM2640 Dual Adjustable Step-Down Switching Power Supply Controller
General Description
The LM2640 is a dual step-down power supply controller intended for application in notebook personal puters and other battery-powered equipment. Fixed-frequency synchronous drive of logic-level N-channel power MOSFETs is bined 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...
