GENERAL DESCRIPTION
Each regulator can be independently switched off to fully isolate the load from the power supply. The PFM architecture will automatically adjust switching frequency at light loads in order to maintain power conversion efficiencies in excess of 90% over a wide output power range. FEATURES
s s Regulation to ± 3% maximum: provides 2% PCMCIA switch matrix margin Two synchronous buck controllers for 3.3/3V, 5V generation, and a flyback for high current, 12V generation from 5.5V to 18V input Regulator power conversion efficiencies > 90% Pulse frequency modulation for high efficiency operation Independent regulator shutdown for full load isolation Adjustable current limit Wide input voltage range (5.5V to 18V) s s s s s (* Indicates Part is End Of Life as of July 1, 2000) BLOCK DIAGRAM VIN 15 24 VREG CLAMP GATE CLAMP CLAMP A P DRV A 2 16 VIN BUCK REGULATOR A BIAS CIRCUITS 13 + N DRV A ISENSE A PWR GND A 23 14 4 VIN 5.5 – 18V 6 GND VOUT A 2.5 – 3.5V 7 GND SHDN A SHDN B SHDN...
Micro Linear
