PMU-CN8911B

The CN8911B is a 4-channel PMU that includes a HV fixed output synchronous buck converter, a HV adjustable output synchronous buck converter, an asynchronous boost converter, a high accuracy super-capacitor charger. The fixed output buck outputs 3.3V/500mA. The adjustable output buck could generate a variable output voltage from 1V to 5V 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 CC and CV mode. When the supply power down detected from DET pin, boost will startup and provide backup 12V voltage, and a PD signal will output. The CN8911B also employs cycle by cycle current limit and hiccup OCP and Input OVP protections, as well as thermal shutdown. The CN8911B is available in space saving QFN4x4-16L package.