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MAX797H - 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.

Key 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-.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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.