19-0045; Rev 1; 5/94
In
it d nK atio nclude u l a I Ev tion a form
Triple-Output Power-Supply Controller for Notebook...
19-0045; Rev 1; 5/94
In
it d nK atio nclude u l a I Ev tion a form
Triple-Output Power-Supply Controller for Notebook Computers
____________________________Features
o o o o o o o Dual PWM Buck Controllers (+3.3V and +5V) Dual PCMCIA VPP Outputs (0V/3.3V/5V/12V) Two Precision Comparators or Level Translators Power-Ready Status Output (RDY5) 95% Efficiency Optimized for 6-Cell Applications 420µA Quiescent Current; 70µA in Standby (linear
regulators alive) 25µA Shutdown Current o 5.5V to 30V Input Range o Small SSOP Package o Fixed Output Voltages Available: 3.3V (standard) 3.45V (High-Speed Pentium™) 3.6V (PowerPC™)
_______________General Description
The MAX783 is a system-engineered power-supply controller for notebook computers or similar battery-powered equipment. It provides two high-performance step-down (buck) pulsewidth modulators (PWMs) for +3.3V/+5V and dual PCMCIA VPP outputs powered by an integral flyback winding controller. Other functions include dual, low-dropout, micropower linear
regulators for CMOS/RTC back up, and two precision lowbattery-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 Idle-ModeTM operation at light loads. The MAX783 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 ...
