19-0146; Rev 2; 5/94
InfEorvmalautaiotinonInKcliut ded
Triple-Output Power-Supply Controller for Notebook Computers
MA...
19-0146; Rev 2; 5/94
InfEorvmalautaiotinonInKcliut ded
Triple-Output Power-Supply Controller for Notebook Computers
MAX782
_______________General Description
The MAX782 is a system-engineered power-supply controller for notebook computers or similar battery-powered equipment. It provides two high-performance step-down (buck) pulse-width modulators (PWMs) for +3.3V and +5V, and dual PCMCIA VPP outputs powered by an integral flyback winding controller. Other functions include dual, lowdropout, micropower linear regulators for
CMOS/RTC backup, and three precision low-battery-detection comparators.
High efficiency (95% at 2A; greater than 80% at loads from 5mA to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and IdleModeTM operation at light loads. It uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architecture that allows for output filter
capacitors as small as 30µF per ampere of l...