AS3710
Triple Buck High Cu rrent P MIC w ith Charg er
www.austriamicrosystems.com 1.2 1 - 98
Datasheet
1 General Description
The AS3710 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 AS3710. 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.
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
possible. An internal voltage protection is limiting the output voltage
in the case of external component failures.
AS3710 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)
- DVM (0.6V-3.3V;1x 1.2-1.5A, 2x 0.7-1A)
- 60µA quiescent current
- 2A with combined DCDC 2 & 3
2 analog low noise LDOs, 6 digital LDOs
- 2x 1.2-3-3V, 6x 0.9-3.3V; 150-300mA
- 30µA 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
HV Backlight Driver
3x 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
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