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ML4880

Micro Linear
Part Number ML4880
Manufacturer Micro Linear
Description Portable PC/PCMCIA Power Controller
Published May 7, 2005
Detailed Description me ed Com °C to 70°C ent Extend –20 Equipm andheld H le b ta for Por ING e e Rang UR T A peratur m e T l FE rcia July ...
Datasheet PDF File ML4880 PDF File

ML4880
ML4880

Overview
me ed Com °C to 70°C ent Extend –20 Equipm andheld H le b ta for Por ING e e Rang UR T A peratur m e T l FE rcia July 2000 ML4880* Portable PC/PCMCIA Power Controller GENERAL DESCRIPTION The ML4880 Portable PC and PCMCIA Power Controller is a complete solution for DC/DC power conversion for portable computing systems with single or multiple PCMCIA slots.
The device provides two synchronous buck controllers to implement mixed voltage systems and a flyback controller for 12V VPP generation for PCMCIA slots.
The flyback architecture enables generation of high currents (150mA or more per slot) on the 12V bus for multiple slot PCMCIA applications.
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 C SHUTDOWN LOGIC – VFB A 9 TO SYSTEM POWER MANAGEMENT 11 18 10 VIN CLAMP GATE CLAMP CLAMP B 1 P DRV B 19 FLYBACK REGULATOR C + 17 N DRV C ISENSE C BUCK REGULATOR B + N DRV B ISENSE B PWR GND B 22 20 5 3 VOUT C 6V – 15V 12 VOUT B 4.
5 – 5.
0V VFB C PWR GND C – VFB B 8 – 21 1 ML4880 PIN CONFIGURATION ML4880 24-Pin SOIC (S24) C...


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