APW8822 Datasheet, PDF (1/27 Pages) Anpec Electronics Coropration – System Power PWM Controller for Notebook Computers with Charge Pump

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) Out-
put
- PWM2 Controller with Adjustable (2V to 5.5V) Out-
put
- 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 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
The linear regulators provide 5V and 3.3V output for
• Integrated Bootstrap Forward P-CH MOSFET
standby power supply. The linear regulators provide up
• High Efficiency over Light to Full Load Range _{to 100mA output current. When the PWMx output voltage}
(PWMs)
is higher than LDOx bypass threshold, the related LDOx
• Built-in Power Good Indicators (PWMs)
regulator is shut off and its output is connected to VOUTx
• Independent Enable Inputs (PWMs, LDO)
by internal switchover MOSFET. It can save power
• 70% Under-Voltage and 125% Over-Voltage Protec- _{dissipation. The charge pump circuit with 270kHz clock}
tions (PWM)
• Adjustable Current-Limit Protection (PWMs)
driver uses VOUT1 as its power supply to generate ap-
proximately 15V DC voltage.
- Using Sense Low-Side MOSFET’s R
DS(ON)
• Over-Temperature Protection
The APW8822/A/B/C provides excellent transient
response and accurate DC output voltage in either PFM
• 3mmx3mm Thin QFN-20 (TQFN3x3-20) package or PWM Mode. In Pulse-Frequency Mode (PFM), the
• Lead Free and Green Device Available (RoHS APW8822/A/B/C provides very high efficiency over light
Compliant)
to heavy loads with loading-modulated switching
frequencies. The Forced-PWM Mode works nearly at
constant frequency for low-noise requirements. The
unique ultrasonic mode maintains the switching
frequency above 25kHz, which eliminates noise in
audio application.
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
1
Rev. A.2 - Nov., 2012
www.anpec.com.tw