PMU-CN8911B

The CN8911B is a 4-channel PMU that includes two wide input, high efficiency synchronous buck converters, one low startup, high efficiency high voltage and high current output boost converter and a high accuracy super-capacitor charger. A HV buck outputs fixed-3.3V/500mA as the other HV buck could generate an adjustable output voltage by setting external resistor divider. The boost converter could provide up to 12V/300mA output from super capacitor or other backup power supply at 2.5V. Boost output is internally fixed 12V with saving external resistors. CN8911B also integrates a linear supercapacitor charger with a high accuracy CV voltage. When the supply power down detected from DET pin, boost will startup and provide backup 12V voltage. And a PD index signal will output.