MAX797H Datasheet | Maxim Integrated

Description The MAX797H high-performance, step-down DC-DC converter provides main CPU power in battery-powered systems. A 40V rating on the power stage’s input allows operation with high-cell-count batteries and a wide range of AC adaptors. This buck controller achieves 96% efficiency by using synchronous rectification and Maxim’s proprietary Idle Mode™ control scheme to extend battery life at full-load (up to 10A) and no-load outputs. Excellent dynamic response corrects output transients caused by the latest dynamic-clock CPUs within five 300k Hz clock cycles. Unique bootstrap circuitry drives inexpensive N-channel MOSFETs, reducing system cost and eliminating the crowbar switching currents found in some PMOS/NMOS switch designs. The MAX797H has a logic-controlled and synchronizable fixed-frequency, pulse-width-modulating (PWM) operating mode, which reduces noise and RF interference in sensitive mobile-munications and pen-entry applications. The SKIP override input allows automatic switchover to idle-mode operation (for high-efficiency pulse skipping) at light loads, or forces fixed-frequency mode for lowest noise at all loads. The MAX797H is pin patible with the popular MAX797, but has a higher input voltage range. The MAX797H es in a 16-pin narrow SO package. ____________________________Features o 96% Efficiency o Up to 40V Power Input o 2.5V to 6V Adjustable Output o o o o o o o o Preset 3.3V and 5V Outputs (at up to 10A) 5V Linear-Regulator Output Precision 2.505V Reference Output Automatic Bootstrap Circuit 150k Hz/300k Hz Fixed-Frequency PWM Operation Programmable Soft-Start 375µA Quiescent Current (VIN = 12V, VOUT = 5V) 1µA Shutdown Current ______________Ordering Information PART† MAX797HESE TEMP. RANGE -40°C to +85°C PIN-PACKAGE 16 Narrow SO †U.S. and foreign patents pending. __________Typical Operating Circuit +4.5V TO +30V SUPPLY INPUT V+ SHDN DH VL +4V TO +40V POWER INPUT ________________________Applications Notebook and Subnotebook puters...