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MAX797

Part Number	MAX797
Manufacturer	Maxim
Description	Step-Down Controllers with Synchronous Rectifier for CPU Power
Published	May 2, 2005
Detailed Description	19-0221; Rev 3a; 11/97 UALS IT MAN TION K A ET U E L H A S A EV W DAT FOLLO Step-Down Controllers with Synchronous Rec...
Datasheet	MAX797 PDF File

Overview

19-0221; Rev 3a; 11/97 UALS IT MAN TION K A ET U E L H A S A EV W DAT FOLLO Step-Down Controllers with Synchronous Rectifier for CPU Power ____________________________Features o 96% Efficiency o 4.
5V to 30V Input Range o 2.
5V to 6V Adjustable Output o o o o o o o o o Preset 3.
3V and 5V Outputs (at up to 10A) Multiple Regulated Outputs +5V Linear-Regulator Output Precision 2.
505V Reference Output Automatic Bootstrap Circuit 150kHz/300kHz Fixed-Frequency PWM Operation Programmable Soft-Start 375µA Typ Quiescent Current (VIN = 12V, VOUT = 5V) 1µA Typ Shutdown Current _______________General Description The MAX796/MAX797/MAX799 high-performance, stepdown DC-DC converters with single or dual outputs provide main CPU power in battery-powered systems.
These buck controllers achieve 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 MAX796/MAX799 are specially equipped with a secondary feedback input (SECFB) for transformer-based dual-output applications.
This secondary feedback path improves cross-regulation of positive (MAX796) or negative (MAX799) auxiliary outputs.
The MAX797 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 MAX796/MAX797/MAX799 are all available in 16pin DIP and narrow SO packages.
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