L4992
DESCRIPTION
The L4992 is a sophisticated dual PWM stepdown controller and power monitor intended for Notebook puter and/or battery powered equipment. The device produces regulated +3.3V, +5.1V and 12V supplies for use in portable SYSTEM BLOCK DIAGRAM
TQFP32 ORDERING NUMBER: L4992 and PCMCIA applications. The internal architecture allows to operate with minimum external ponents count. A very high switching frequency (200/300 KHz or externally synchronizable) optimizes their physical dimensions. Synchronous rectification and pulse skipping mode for the buck sections optimise the overall efficiency over a wide load current range (96% efficiency @1A/5.1V and 93% efficiency @ 0.05A/5.1V. The two high performance PWM controllers for +3.3V and +5.1V lines are monitored for overvoltage, undervoltage and overcurrent conditions. On detection of a fault, a POWER GOOD signal is generated and a specific shutdown procedure takes place to prevent physical damage and data corruption. A disable...
