ML4880

·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)

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 ML4880 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 ML4880 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.