2.2MHz, Dual, Step-Down DC-DC Converters, Dual LDOs, and Active-Low RESET

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 stepdown 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. The device is designed to operate from -40°C to +125°C ambient temperature.

Applications

* Automotive

* 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

* 600mA High-Efficiency 2.2MHz DC-DC Converter

* 2.7V to 5.5V Supply Voltage

* Output Voltage: 1.0V to 3.9V

* 180° Out-of-Phase Operation

* Forced-PWM and Auto-PWM Modes

* LDO Linear Regulators

* OUT3: 1.0V to 4.15V at 300mA

* OUT4: 1.0V to 4.15V at 300mA

* Separate Inputs for Increased Efficiency

* Enable Input

* Active-Low RESET Output Monitoring on OUT1 and OUT2

* Overtemperature and Short-Circuit Protection

* Available in

* 5mm × 5mm × 0.8mm, 20-Pin TQFN-EP

* 4.5mm × 6.5mm, 20-Pin TSSOP-EP