MAX786 Datasheet | Maxim Integrated

Description The MAX786 is a system-engineered power-supply controller for notebook puters or similar batterypowered equipment. It provides two high-performance step-down (buck) pulse-width modulators (PWMs) for +3.3V and +5V. Other features include dual, low-dropout, micropower linear regulators for CMOS/RTC back-up, and two precision low-batterydetection parators. High efficiency (95% at 2A; greater than 80% at loads from 5m A to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and Idle Mode TM operation at light loads. The MAX786 uses physically small ponents, thanks to high operating frequencies (300k Hz/200k Hz) and a new current-mode PWM architecture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and loadtransient responses are terrific, with a high 60k Hz unitygain crossover frequency allowing output transients to be corrected within four or five clock cycles. Low system cost is achieved through a high level of integration and the use of low-cost, external N-channel MOSFETs. Other features include low-noise, fixed-frequency PWM operation at moderate to heavy loads, and a synchronizable oscillator for noise-sensitive applications such as electromagnetic pen-based systems and municating puters. The MAX786 is a monolithic, Bi CMOS IC available in fine-pitch, surface-mount SSOP packages. _________________Ordering Information PART MAX786CAI MAX786RCAI TEMP. RANGE 0°C to +70°C 0°C to +70°C PIN-PACKAGE 28 SSOP 28 SSOP VOUT 3.3V 3.45V Ordering Information continued at end of data sheet. _____________________Pin Configuration TOP VIEW CS3 1 SS3 2 ON3 3 D1 4 D2 5 VH 6 28 FB3 27 DH3 26 LX3 25 BST3 ___________________________Applications Notebook puters Portable Data Terminals municating puters Pen-Entry Systems 24 DL3 23 V+ 22 VL 21 FB5 20 PGND 19 DL5 18 BST5 17 LX5 16 DH5 15 CS5 ________Typical Application Diagram +3.3V 5.5V TO 30V SHUTDOWN 5V ON/OFF 3.3V ON/OFF SYNC POWER SECTION...