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APW8811

ANPEC
Part Number APW8811
Manufacturer ANPEC
Description System Power PWM Controller
Published Dec 22, 2013
Detailed Description APW8811 System Power PWM Controller for Notebook Computers Features • • Wide Input Voltage Range from 6V to 25V Provide...
Datasheet PDF File APW8811 PDF File

APW8811
APW8811

Overview
APW8811 System Power PWM Controller for Notebook Computers Features • • Wide Input Voltage Range from 6V to 25V Provide 4 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 Simplified Application Circuit VIN 6V~28V VLDO 5 VOUT1 Q1 L1 Q2 PWM1 PWM2 EN LDO LDO5 EN PWM LDO3 VLDO 3 Q3 L2 Q4 VOUT2 General Description The APW8811 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.
The output of PWM1 and PWM2 can be adjusted from 2V to 5.
5V by setting a resistive voltage-divider from VOUTx to GND.
The linear regulators provide 5V and 3.
3V output for standby power supply.
The linear regulators provide up to 100mA output current.
When the PWMx output voltage is higher than LDOx bypass threshold, the related LDOx regulator is shut off and its output is connected to VOUTx by internal switchover MOSFET.
It can save power dissipation.
The APW8811 provides excellent transient response and accurate DC output voltage in either PFM or PWM Mode.
In Pulse-Frequency Mode (PFM), the APW8811 provides very high efficiency over light to heavy loads with loadingmodulated 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 applications.
The APW8811 is equipped with accurate sourcing current-limit, output under-voltage and output over-voltage protections, being perfect for NB applications.
A 1.
7ms • • • • • • • • • • • • • • • • Excellent Line/Load Regulations...


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