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 IdleMode™ control scheme to extend battery life at full-load (up to 10A) and no-load outputs. Excellent dynamic response corrects output tran sients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Unique bootstrap circuitry drives inexpensive N-channel MOSFETs, reducing system cost

Features

♦96% Efficiency

♦Up to 40V Power Input

♦2.5V to 6V Adjustable Output

♦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