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概述

The MAX16922 power-management integrated circuit (PMIC) is designed for medium power-level automotive applications and integrates multiple supplies in a small footprint. The device includes one high-voltage step-down converter (OUT1) and three low-voltage cascaded DC-DC converters (OUT2, OUT3, OUT4). OUT1 and OUT2 are step-down DC-DC converters, and OUT3/OUT4 are linear regulators. The device also includes a reset output (active-low RESET) and a high-voltage-compatible enable input (EN).

The 1.2A output high-efficiency, step-down DC-DC converter (OUT1) operates from a voltage up to 28V continuous and is protected from load-dump transients up to 45V. The 600mA output high-efficiency step-down DC-DC converter (OUT2) runs from a voltage up to 5.5V. The two 300mA LDO linear regulators offer low dropout of only 130mV (typ). The power-good active-low RESET output provides voltage monitoring for OUT1 and OUT2.

OUT1 and OUT2 use fast 2.2MHz PWM switching and small external components. The high-voltage converter (OUT1) enters skip mode automatically under light loads to prevent an overvoltage condition from occurring at the output. The low-voltage synchronous DC-DC converter (OUT2) can operate in forced-PWM mode to prevent any AM band interference or high-efficiency auto-PWM mode.

The MAX16922 includes overtemperature shutdown and overcurrent limiting. All devices are designed to operate from -40°C to +125°C ambient temperature.

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1.2A High-Efficiency 2.2MHz DC-DC Converter

• 3.7V to 28V Operating Supply Voltage
• 45V Load-Dump Protection
• Output Voltage: 3.0V to 5.5V