Description
The L5994 is a sophisticated dual PWM stepdown controller and power monitor intended for Notebook computer and/or battery powered equipment. The device produces regulated 1.8V, 2.5V (both adjustable)and 12V supplies for use in portable and PCMCIA applications. The internal architecture allows to operate with minimum external components 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. The two high performance PWM controllers for 1.8V and 2.5V 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. This is preliminary information on a new product now in development. Details are subject to change without notice. September 1999  SYNC POWER MANAGEMENT & SYSTEM SUPERVISOR 5V to 25V 2.5V 1.8V POWER SECTION L5994 µP MEMORY PERIPHERALS 12V LDO 5.1V LDO 3.39V REF D98IN862 POWER GOOD SYSTEM BLOCK DIAGRAM TQFP32 ORDERING NUMBER: L5994 1/8

Applications
■ NOTEBOOK AND SUBNOTEBOOK COMPUTERS PEN TOP AND PORTABLE EQUIPMENT COMMUNICATING COMPUTERS