APW8822/A/B/C
System Power PWM Controller for Notebook Computers with Charge Pump
Features
Simplified Application Cir...
APW8822/A/B/C
System Power PWM Controller for Notebook Computers with Charge Pump
Features
Simplified Application Circuit
Wide Input voltage Range from 6V to 25V Provide 5 Independent Outputs with ±1.0% Accu-
racy Over-Temperature
- PWM1 Controller with Adjustable (2V to 5.5V) Output
- PWM2 Controller with Adjustable (2V to 5.5V) Output
VIN 6V~25V
VLDO5
VOUT1
ENILIM1 EN LDO ENILIM2
Q1
LDO5 LDO3
VLDO3 Q3
L1 PWM1 PWM2
L2 VOUT2
Q2
Q4
Charge Pump
- 100mA Low Dropout
Regulator (LDO5) with Fixed
C1 D2
D3 C3 D4
VCP
5V Output - 100mA Low Dropout
Regulator (LDO3) with Fixed
D1
C2
C4
3.3V Output
- 270kHz Clock Signal for 15V Charge Pump (Used General Description
VOUT1 as Its Power Supply)
The APW8822/A/B/C integrates dual step-down, constant-
Excellent Line/Load Regulations about ±1.5% Over- on-time, synchronous PWM controllers (that drives dual
Temperature Range
N-channel MOSFETs for each channel) and two low drop-
Built in POR Control Scheme Implemented
out
regulators as well as various protections into a chip.
Constant On-Time Control Scheme with Frequency The PWM controllers step down high voltage of a battery
Compensation for PWM Mode
to generate low-voltage for NB applications. The output
Selectable Switching Frequency in PWM Mode
of PWM1 and PWM2 can be adjusted from 2V to 5.5V by
Built-in Digital Soft-Start for PWM Outputs and Soft- setting a resistive voltage-divider from VOUTx to GND.
Stop for PWM Outputs and LDO Outputs
Th...