A S 3 7 11
1 General Description
The AS3711 is a compact System PMU with integrated
battery charger and back light driver.
The device offers advanced power management func-
tions. All necessary ICs and peripherals in a battery
powered mobile device are supplied by the AS3711. It
features 3 DCDC buck converters (4MHz), one buck
controller as well as 8 low noise LDOs. The supply volt-
ages are programmable via the serial control interface.
The three step-up converter generate voltages for
e.g.the backlight, classD amplifier, USB host support or
LCD display supply. Both constant voltage (for e.g.
OLED supply) as well as constant current (white LED
backlight) operations with three current sinks are possi-
ble. An internal voltage protection is limiting the output
voltage in the case of external component failures.
AS3711 contains a linear or switching mode Li-Ion bat-
tery charger with constant current and constant voltage.
The maximum charging current is 1.5A. An integrated
battery switch and an optional external switch are sepa-
rating the battery during charging or whenever an exter-
nal power supply is present. With this switch it is also
possible to operate with no or deeply discharged batter-
ies. A programmable current limit can be used to control
the maximum current used from a USB supply. Addi-
tional features are a 30V OV protection and battery tem-
perature supervision.
The single supply voltage may vary from 2.7V to 5.5V.
Product Brief
H i g h C u r r e n t P o w e r M a n a g e m e n t U n i t fo r P o r ta b l e D e v i c e s
HV Backlight Driver
2x
step up with external transistor
control mode and over-voltage protection
voltage
3
programmable current sinks (max. 40mA)
500mA@5V; 40mA@50V
external PWM dimming input (DLS, CABC)
e.g.
possible
Battery Charger
prog.
prog.
prog.
trickle charging (25-220mA)
constant current charging (up to 1500mA)
constant voltage charging (3.9V-4.25V)
time-out and temperature supervision
current limitation for USB mode
battery switch & ideal diode (linear mode)
charger
selectable
integrated
external
external
battery switch control (switching mode)
30V OV protection
General
Supervisor
automatic
battery monitoring with interrupt genera-
tion and selectable warning level
temperature monitoring with interrupt
generation and selectable warning and shutdown
levels
automatic
2 Key Features
Power Management
Voltage Generation
4
Real Time Clock
ultra
sec
low power 32kHz oscillator
and minute counter, auto wake-up
alarm (seconds or minutes)
selectable
32kHz
<1uA
clock output to peripheral
DCDC step down regulators
DVM (0.6V-3.3V;1x 1.2-1.5A, 2x 0.7-1A)
controller mode for 2-3A supplies
50uA quiescent current
selectable switching frequency (4, 3 or 2MHz)
2A with combined DCDC 2 & 3
analog low noise LDOs, 6 digital LDOs
total power consumption
-
-
-
-
-
2
4 General Purpose IOs
10bit
general purpose ADC input
and DVM input
wake-up/sleep
PWM
status
(DLS, CABAC) dimming input
- 2x 1.2-3-3V, 6x 0.9-3.3V; 150-300mA
- 30uA quiescent current (low power mode)
1
output for: charger, low battery, power good
and step-up overcurrent
clock output
output
Q32k
ultra low power always on LDO 2.5V, 10mA
supply supervision
interrupt
PWM
power
4sec
output
feedback input
and 8sec emergency shut-down
function
step-up
hibernation
www.austriamicrosystems.com
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AS3711
Product Brief - K e y F e a t u r e s
Copyright
Copyright © 2011, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trade-
marks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated,
stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement. austria-
microsystems AG reserves the right to change specifications and prices at any time and without notice. Therefore,
prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current informa-
tion. This product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-
sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for
each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the tech-
nical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
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