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MAX798

Maxim
Part Number MAX798
Manufacturer Maxim
Description High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power
Published May 2, 2005
Detailed Description 19-1175; Rev 0; 12/96 High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power _______________Genera...
Datasheet PDF File MAX798 PDF File

MAX798
MAX798

Overview
19-1175; Rev 0; 12/96 High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power _______________General Description The high-performance, step-down DC-DC converter provides main CPU power in battery-powered systems.
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.
The MAX798’s high accuracy meets the demanding requirements of the latest-generation CPUs.
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 MAX798 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.
MAX798† ____________________________Features o 96% Efficiency o 4.
5V to 30V Input Range o 1.
6V to 6V Adjustable Precision Output o o o o o ±0.
4% Max Total Load-Regulation Error 0.
06%/V Max Line-Regulation Error 5V Linear-Regulator Output Precision 2.
505V Reference Output Automatic Bootstrap Circuit MAX798 o 150kHz/300kHz Fixed-Frequency PWM Operation o Programmable Soft-Start o 1.
2mA Typical Quiescent Current (VIN = 12V, VOUT = 2.
5V) o 1µA Typical Shutdown Current ______________Ordering Information PART MAX798ESE TEMP.
RANGE -40°C to +85°C PIN-PACKAGE 16 Narrow SO ________________________Applications Notebook and Subnotebook Computers PDAs and Mobile Communicators __________Typical Operating Circuit INPUT 4.
5V TO 30V __________________Pin Configuration...


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