AS3711
Quad Buck High Current PMIC with
Charger
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.
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.
Ordering Information
and
Content Guide
appear at end of
datasheet.
ams Datasheet
[v1-34] 2014-Nov-10
Page 1
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AS3711 −
General Description
Key Benefits & Features
The benefits and features of AS3711, Quad Buck High Current
PMIC with Charger are listed below:
Figure 1:
Added Value Of Using AS3711
Benefits
Compact design due to small coils for IO
and memory voltage generation
Features
• 3 DCDC step down regulators (2-4MHz)
- DVM (0.6V-3.3V;1×1.2-1.5A, 2×0.7-1A)
- 60μA 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
- 2×1.2-3-3V, 6×0.9-3.3V; 150-300mA
- 30μA quiescent current (low power mode)
• 1 ultra low power always on LDO 2.5V, 10mA
HV Backlight Driver
• 2×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)
• 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
Real Time Clock
• Ultra low power 32kHz oscillator
• Sec and minute counter, auto wake-up
• Programmable alarm
• Repeating alarm (seconds, minutes, 2 minutes,
or 8 minutes)
• 32kHz clock output to peripheral
• <1μA total power consumption
High current generation for processor core
Supply multiple independent voltage rails
for general IO supplies
Backlight boost controller for multiple
display configurations or fixed voltage
supplies
Self contained free configurable charger
with stand alone supervisory functions
Save supervision in HV which works also
without a processor
Very low current time keeping and alarm
functions without the need of a processor
Page 2
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ams Datasheet
[v1-34] 2014-Nov-10
AS3711 −
General Description
Benefits
Features
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
OTP programmable BOOT Sequence
• Programmable regulator default voltages
• Programmable start-up sequence
General Purpose ADC
• 10-bit resolution
• Several internal / external sources
- VUSB, VSUP, CHGIN, VBAT
- GPIOx, CURRx
- XOUT32K, SENSEN_SU1, LX_SD4
- Chip temperature
Control Interface
• I
2
C control lines, including watchdog
• ON input with 4/8s emergency shut-down
• Bidirectional reset, with selectable delay
• Ultra low power standby mode
Power-On Reset Circuit
Packaging
• QFN56 7×7mm 0.4mm pitch
• CSP64 3.6x3.5mm 0.4mm pitch
Flexible multi-purpose IOs for general
control or measurement tasks
Flexible and fast adaptations to different
processors/applications.
Enables the processor to check the system
state in detail
Easy control of all PMIC functions, Safety
shutdown feature, without reset button.
No need for external POR or supervisory
Dedicated packages for specific
applications.
Optimization for PCB cost or size.
Applications
The AS3711, Quad Buck High Current PMIC with Charger, is
suitable for Portable Media Players, Portable Navigation
Devices, E-Books, Mobile Internet Devices, and Tablet PCs.
ams Datasheet
[v1-34] 2014-Nov-10
Page 3
Document Feedback
AS3711 −
General Description
Figure 2:
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ams Datasheet
[v1-34] 2014-Nov-10
AS3711 −
General Description
Figure 3:
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ams Datasheet
[v1-34] 2014-Nov-10
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Page 5
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