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Data Sheet
AS3608
System PMU with HV Back Light Driver
1 General Description
The AS3608 is an ultra compact System PMU with integrated battery
charger and HV 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 AS3608. It features 3 DCDC converters as well
as 5 low noise LDOs. The different regulated supply voltages are
programmable via the serial control interface.
The step-up converter for the backlight can operate up to 30V. Both
constant voltage (OLED supply) as well as constant current (white
LED backlight) operations with 2 current sinks are possible. An
internal voltage protection is limiting the output voltage in the case of
external component failures.
HV Backlight Driver
Step up for 30V backlight with internal transistor
2 programmable current sink (max. 38mA)
Possible external PWM dimming input
Voltage control mode and over-voltage protection
Max. 20mA@50V (with ext. transistor) or 500mA@5V
Battery Charger
Prog. trickle charging (25-265mA)
AS3608 also contains a Li-Ion battery charger with constant current
and constant voltage. The maximum charging current is 1A. 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
can be used to control the maximum current used from a USB
supply.
The single supply voltage may vary from 2.7V to 5.5V.
2 Key Features
Power Management
Voltage Generation
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3 DCDC step down regulators
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DVM (0.61V-3.3V, 1A@1.2V, 900mA@1.8V 800mA@2.5V)
50µA quiescent current
Selectable switching frequency (2 or 1MHz)
2A@1.2V with combined DCDC 2 & 3
1 LDO low noise 2.7V (2.3-3.5V), 100mA
3 or 4 LDOs low noise
- 1.2-3.5V; 160/270mA
- 30µA quiescent current (low power mode)
Power supply supervision (LDO5)
Hibernation function
4sec and 8sec emergency shut-down
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Prog. constant current charging (94-1060mA)
Prog. constant voltage charging (3.9V-4.25V)
Selectable current limitation for USB mode
Integrated battery switch & ideal diode
External battery switch control output
Charger time-out and temperature supervision
General
Battery and Temperature Supervisor
4 General Purpose IOs
10bit general purpose ADC input
PWM dimming input or wake-up input
Status output for: charger, low battery, power good and power-
up key
Programmable regulator default voltages
Programmable start-up sequence
Applicable for LDO 1-4 and DCDC 1-3
I2C control lines, including watchdog
Power-Up input
Interrupt output
Bidirectional reset, with selectable delay
Low power standby mode, 180µA with LDO5 on
OTP Programmable BOOT Sequence
Control Interface
Power-On Reset Circuit
Packaging
QFN36 6x6mm, 0.5mm pitch
3 Application
The devices are ideal for Portable Media Players and Portable
Navigation Devices, e-Books, Tablet PCs, etc
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AS3608 2v2
Data Sheet - A p p l i c a t i o n
Figure 1. AS3608 Block Diagram
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AS3608 2v2
Data Sheet - C o n t e n t s
Contents
1 General Description ..................................................................................................................................................................
5 Absolute Maximum Ratings ......................................................................................................................................................
Voltage Feedback and OV Protection .......................................................................................................................................
Voltage Feedback......................................................................................................................................................................
Current Sinks .............................................................................................................................................................................
End of Charge Detection ........................................................................................................................................................... 22
VSUPSW and Temperature Supervision................................................................................................................................... 22
Battery Temperature Supervision .............................................................................................................................................. 22
No Battery Detection.................................................................................................................................................................. 22
Junction Temperature Supervision ............................................................................................................................................ 26
Power Rail Monitoring ................................................................................................................................................................ 26
8.1 Low Drop Out Regulators ...................................................................................................................................................................
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