L4992 Datasheet PDF | STMicroelectronics

STMicroelectronics L4992

The L4992 is a sophisticated dual PWM stepdown controller and power monitor intended for Notebook computer 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 components count.

Part No.	L4992
Datasheet	L4992 Download
Manufacturer	STMicroelectronics
Description	TRIPLE OUTPUT POWER SUPPLY CONTROLLER
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DESCRIPTION

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 function allows to manage the output power sections separately, optimising the quiescent consumption of the IC in stand-by conditions. 3.3V 5.5V to 25V L4992 POWER SECTION 5.1V SYNC 12V LDO 5.1V LDO POWER MANAGEMENT & SYSTEM SUPERVISOR 3.39V REF POWER GOOD µP MEMORY PERIPHERALS D96IN429A June 2000 1/26 L4992

ABSOLUTE MAXIMUM RATINGS

Symbol VIN VI IIN IOUT TJ Parameter Power Suppl...