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ams AG
The technical content of this austriamicrosystems datasheet is still valid.
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D ata sh eet
A S3 7 11
Q u a d B u c k H ig h Cu r r e n t P M IC w i th Ch a r g e r
1 General Description
The AS3711 is a compact System PMU with integrated battery
charger and back light driver.
The device offers advanced power management functions. All
necessary ICs and peripherals in a battery powered mobile device
are supplied by the AS3711. It features 3 DCDC buck converters as
well as 8 low noise LDOs. The different regulated supply voltages
are programmable via the serial control interface. 4MHz operation
with 1uH coils are reducing cost and PCB space.
AS3711 further features a DCDC buck controller which is ideal to
support processor core currents up to 3A.
HV Backlight Driver
2x step up with external transistor
- e.g. 0.5-1A@5V; 40mA@50V
Voltage control mode and over-voltage protection
3 programmable current sinks (max. 40mA)
Possible external PWM dimming input (DLS, CABC)
Battery Charger
Programmable trickle charging (25-220mA)
The two 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
possible. 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 battery charger
with constant current and constant voltage. The maximum charging
current is 1.5A. An integrated battery switch and an optional external
switch are separating the battery during charging or whenever an
external power supply is present. With this switch it is also possible
to operate with no or deeply discharged batteries. A programmable
current limit (100mA - 2.5A) can be used to control the maximum
current used from a USB supply or charger input. Additional features
are a 30V OV protection and battery temperature supervision.
The single supply voltage may vary from 2.7V to 5.5V.
2 Key Features
Voltage Generation
3 DCDC step down regulators (2-4MHz)
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- DVM (0.6V-3.3V;1x 1.2-1.5A, 2x 0.7-1A)
- 60 A quiescent current
- 2A with combined DCDC 2 & 3
DCDC step down controller
- DVM (0.6V-3.3V; 2-3A)
2 analog low noise LDOs, 6 digital LDOs
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- 2x 1.2-3-3V, 6x 0.9-3.3V; 150-300mA
- 30 A quiescent current (low power mode)
1 ultra low power always on LDO 2.5V, 10mA
Power supply supervision
4sec and 8sec emergency shut-down
Stand-by function with voltage selection
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Programmable constant current charging (up to 1500mA)
Programmable constant voltage charging (3.9V-4.25V)
Charger time-out and temperature supervision
Selectable current limitation for USB mode
Integrated battery switch & ideal diode (linear mode)
External battery switch control (switching mode)
External 30V OV protection
Supervisor
Automatic battery monitoring with interrupt generation and
selectable warning level
Automatic temperature monitoring with interrupt generation and
selectable warning and shutdown levels
Ultra low power 32kHz oscillator
Real Time Clock
Sec and minute counter, auto wake-up
Programmable alarm
Repeating alarm (seconds, minutes, 2 minutes, or 8 minutes)
32kHz clock output to peripheral
<1 A total power consumption
General Purpose IOs
10-bit general purpose ADC input
Wake-up/sleep and DVM input
PWM (DLS, CABC) dimming input
Status output for: charger, low battery, power good and step-up
over-current
Q32k clock output
Interrupt output
PWM output
Step-up feedback input
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OTP programmable BOOT Sequence
Programmable regulator default voltages
Programmable start-up sequence
Control Interface
I2C control lines, including watchdog
ON input
Bidirectional reset, with selectable delay
Ultra low power standby mode
General Purpose ADC
10-bit resolution
Several internal / external sources
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-
VUSB, VSUP, CHGIN, VBAT
GPIOx, CURRx
XOUT32K, SENSEN_SU1, LX_SD4
Chip temperature
Power-On Reset Circuit
Packaging
QFN56 7x7mm 0.4mm pitch
Figure 1.
AS3711
Block Diagram
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3 Application
The device is suitable for Portable Media Players, Portable
Navigation Devices, E-Books, Mobile Internet Devices, and Tablet
PCs. .
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AS3711
2V1
Datasheet - C o n t e n t s
Contents
1 General Description
2 Key Features
3 Application
.................................................................................................................................................................. 1
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4 Pin Assignments
4.1 Pin Descriptions
5 Absolute Maximum Ratings
6 Electrical Characteristics
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7 Typical Operating Characteristics
8.1 DCDC Step-Down Converter
8.2 DCDC Step-Down Controller
8.3 Analog LDO Regulators
8.4 Digital LDO Regulators
8 Detailed Description - Power Management Functions
........................................................................................................... 10
8.5 Low power LDO V2_5 Regulators
8.6 DCDC Step-Up Converter
8.7 Current Sinks
8.8 Charger
9.1 Start-up
9.2 Reset
9.3 Stand-by
9.5 GPIO Pins
9.6 Supervisor
9.7 Watchdog
9.9 10-Bit ADC
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9 Detailed Description - System Functions
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9.4 Internal References
9.8 Interrupt Generation
9.10 Real Time Clock
9.11 2-Wire-Serial Control Interface
10 Register Overview
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11 Application Information
13 Ordering Information
12 Package Drawings and Markings
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AS3711
2V1
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
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