ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER
Description
®
L5994
ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER
PRODUCT PREVIEW
DUAL PWM BUCK CONTROLLERS ADJUSTABLE 1.
9V to 5V (Section 1) 1.
66V to 3.
5V (Section 2) 12V/120mA LINEAR REGULATOR DUAL SYNCH RECTIFIERS DRIVERS 96% EFFICIENCY ACHIEVABLE 50µA (@ 12V) STAND BY CONSUMPTION 5.
0V TO 25V SUPPLY VOLTAGE EXCELLENT LOAD TRANSIENT RESPONSE DISABLE PULSE SKIPPING FUNCTION OUTPUT UNDERVOLTAGE SHUTDOWN 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 L5994 is a sophisticated dual PWM stepdown controller and power monitor intended for SYSTEM BLOCK DIAGRAM
TQFP32 ORDERING NUMBER: L5994
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.
2.
5V 5V to 25V
L5994
POWER SECTION
1.
8V
SYNC
12V LDO 5.
1V LDO POWER MANAGEMENT & SYSTEM SUPERVISOR 3.
39V REF POWER GOOD
µP MEMORY PERIPHERALS
D98IN862
September 1999
This is preliminary information on a new product now in development.
Details are subject to change...
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