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MAX16922: Maxim's automotive-grade PMIC with two DC-DC converters, two LDO regulators, and a power-good reset output for voltage monitoring

22nd April 2010

Maxim Integrated

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Maxim just introduced the MAX16922, a 2.2MHz, high-voltage, four-channel power-management IC (PMIC) optimized for automotive applications that require up to four power rails at medium power levels. This device integrates one high-voltage step-down converter, one low voltage step-down converter, two low-voltage LDO regulators, and a power-good reset output for voltage monitoring-all in a compact (5mm x 5mm) footprint. The MAX16922 is well suited for automotive applications in which small solution size and power efficiency are critical.

The high-voltage step-down converter is capable of delivering 1.2A and is optimized for operation in the normal automotive battery range of 8V to 18V. However, it is able to operate during load-dump transients up to 42V and cold-crank events down to 3.5V. The other three power rails are cascaded from the output of the high-voltage converter or one of the other converters. Each has a separate supply pin to allow flexibility in configuration and maximum conversion efficiency. The 600mA step-down converter operates with a 2.7V to 5.5V supply voltage, while the two 300mA low-dropout linear regulators operate with a supply from 1.7V to 5.5V.

To reduce switching noise, the 600mA step-down converter operates 180 degrees out-of-phase with the high-voltage step-down converter and can be operated in forced-PWM mode. The output voltages of all four channels are factory-trimmed to fixed values. Protection features include overcurrent limiting and thermal shutdown.

The MAX16922 is fully specified over the -40 degrees Celsius to +125 degrees Celsius automotive temperature range. It is AEC-Q100 qualified and available in thermally enhanced, 20-pin TQFN (5mm x 5mm) and TSSOP (4.5mm x 6.5mm) packages. Pricing starts at $4.92 (1000-up, FOB USA).