The MAX797HESE+ is a high voltage, step-down controller with synchronous rectifier for CPU power in 16 pin NSOIC package. 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 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 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. It has a logic controlled and synchronized fixed-frequency, pulse width modulating (PWM) operating mode which reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. It is used in notebook and subnotebook computers.
● Supply voltage range is 4.5V to 30V
● Operating temperature range from -40°C to 85°C
● 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, programmable soft start
● Quiescent current (VIN = 12V, VOUT = 5V) is 375µA
● Shutdown current is 1µA
