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MAX797H

Maxim
Part Number MAX797H
Manufacturer Maxim
Description High-Voltage / Step-Down Controller with Synchronous Rectifier for CPU Power
Published May 2, 2005
Detailed Description 19-1239; Rev 0; 7/97 High-Voltage, Step-Down Controller with Synchronous Rectifier for CPU Power _______________General...
Datasheet PDF File MAX797H PDF File

MAX797H
MAX797H

Overview
19-1239; Rev 0; 7/97 High-Voltage, Step-Down Controller with Synchronous Rectifier for CPU Power _______________General 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 300kHz 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-communications 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 compatible with the popular MAX797, but has a higher input voltage range.
The MAX797H comes 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 150kHz/300kHz Fixed-Frequency PWM Operation Programmable Soft-Start 375µA Quiescent Current (VIN = 12V, VOUT = 5V) 1µA Shutdown Current MAX797H ______________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...


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