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L4992

STMicroelectronics
Part Number L4992
Manufacturer STMicroelectronics
Description TRIPLE OUTPUT POWER SUPPLY CONTROLLER
Published Mar 22, 2005
Detailed Description ® L4992 TRIPLE OUTPUT POWER SUPPLY CONTROLLER DUAL PWM BUCK CONTROLLERS (3.3V and 5.1V) 12V/120mA LINEAR REGULATOR DUA...
Datasheet PDF File L4992 PDF File

L4992
L4992


Overview
® L4992 TRIPLE OUTPUT POWER SUPPLY CONTROLLER DUAL PWM BUCK CONTROLLERS (3.
3V and 5.
1V) 12V/120mA LINEAR REGULATOR DUAL SYNCH RECTIFIERS DRIVERS 96% EFFICIENCY ACHIEVABLE 50µA (@ 12V) STAND BY CONSUMPTION 5.
5V TO 25V SUPPLY VOLTAGE EXCELLENT LOAD TRANSIENT RESPONSE DISABLE PULSE SKIPPING FUNCTION POWER MANAGEMENT: - UNDER AND OVERVOLTAGE OUTPUT DETECTION - POWER GOOD SIGNAL - SEPARATED DISABLE THERMAL SHUTDOWN PACKAGE: TQFP32 APPLICATION NOTEBOOK AND SUBNOTEBOOK COMPUTERS PEN TOP AND PORTABLE EQUIPMENT COMMUNICATING COMPUTERS DESCRIPTION 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.
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 Supply Voltage on VIN Maximum Pin Voltage to Pins 1, 24, 25, 32 Input Current...


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