APW8812
Description
The APW8812 integrates dual step-down, constant-ontime, synchronous PWM controllers (that drives dual Nchannel MOSFETs for each channel) and two low dropout regulators as well as various protections into a chip. The PWM controllers step down high voltage of a battery to generate low-voltage for NB applications.
Key Features
- Wide Input voltage Range from 6V to 25V Provide 5 Independent Outputs with ±1.5% Accuracy Over-Temperature - PWM1 Controller with Adjustable (2V to 5.5V) Output - PWM2 Controller with Adjustable (2V to 5.5V) Output - 100mA Low Dropout Regulator (LDO5) with Fixed 5V Output - 100mA Low Dropout Regulator (LDO3) with Fixed 3.3V Output - 270kHz Clock Signal for 15V Charge Pump (Used VOUT1 as Its Power Supply) Excellent Line/Load Regulations about ±1.5% OverTemperature Range ±1%, (±1.5%, 50µA) 2.0V Reference Voltage Output Built-In POR Control Scheme Implemented Selectable Forced-PWM or Automatic PFM/PWM (with Selectable Ultrasonic Operation) Constant-On-Time Control Scheme with Frequency Compensation for PWM Mode Selectable Switching Frequency in PWM Mode Built-in Digital Soft-Start for PWM Outputs and SoftStop for PWM Outputs and LDO Outputs Integrated Bootstrap Forward P-CH MOSFET High Efficiency over Light to Full Load Range (PWMs) Built-in Power Good Indicators (PWMs) Independent Enable Inputs (PWMs, LDO) 70% Under-Voltage and 125% Over-Voltage Protections (PWM) Adjustable Current-Limit Protection (PWMs) - Using Sense Low-Side MOSFET’ s RDS(ON) Over-Temperature Protection 4mmx4mm Thin QFN-24 (TQFN4x4-24A) package Lead Free and Green Device Available (RoHS Compliant) Simplified Application Circuit VIN 6V~28V VLDO 5 VOUT1 ENILIM1EN LDO ENILIM2 LDO5 LDO3 VLDO 3 VOUT2 Q1 L1 Q3 L2
