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PDF AS3608 Data sheet ( Hoja de datos )
| Número de pieza | AS3608 | |
| Descripción | System PMU | |
| Fabricantes | austriamicrosystems | |
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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.
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
3 DCDC step down regulators
- DVM (0.61V-3.3V, [email protected], [email protected] [email protected])
- 50µA quiescent current
- Selectable switching frequency (2 or 1MHz)
- [email protected] 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)
4sec and 8sec emergency shut-down
Hibernation function
HV Backlight Driver
Step up for 30V backlight with internal transistor
Voltage control mode and over-voltage protection
2 programmable current sink (max. 38mA)
Max. 20mA@50V (with ext. transistor) or 500mA@5V
Possible external PWM dimming input
Battery Charger
Prog. trickle charging (25-265mA)
Prog. constant current charging (94-1060mA)
Prog. constant voltage charging (3.9V-4.25V)
Charger time-out and temperature supervision
Selectable current limitation for USB mode
Integrated battery switch & ideal diode
External battery switch control output
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
OTP Programmable BOOT Sequence
Programmable regulator default voltages
Programmable start-up sequence
Applicable for LDO 1-4 and DCDC 1-3
Control Interface
I2C control lines, including watchdog
Power-Up input
Interrupt output
Bidirectional reset, with selectable delay
Low power standby mode, 180µA with LDO5 on
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
www.austriamicrosystems.com
Revision 1.03
1 - 67
1 page  
AS3608 2v2
Data Sheet - Pin Assignments
4 Pin Assignments
Figure 2. Pin Assignments (TopView)
4.1 Pin Descriptions
Note: Pin description may change in preliminary data sheets.
Table 1. Pin Description for AS3608
Pin Name
Pin Number
AS3608
Type
Description
VBATSW 1 SUP IO Battery Switch Terminal to be connected to the Li-Ion battery
VSUPSW 2 SUP IO Battery Switch Terminal to be connected to system supplies VSUPx
VUSB
BATTEMP
3
4
SUP IN
ANA IO
Charger or USB Bus Power Input
Li-Ion Charger Battery Temp. Sensor Input
EXTBATSW 5 ANA OUT External Battery Switch Gate Driver Output
VDD27
6 SUP IO LDO5 Output default 2.7V
PVDD4
VSUP5
7 ANA OUT LDO4 Output
8 SUP IN LDO3/4 & LDO5 Pos. Supply Terminal, connect to VSUPSW
PVDD3
PVDD2
PVDD1
9 ANA OUT LDO3 Output
10 ANA OUT LDO2 Output
11 ANA OUT LDO1 Output
VSUP4
12 SUP IN LDO1/2 Pos. Supply Terminal
if not used
open
always needed
open
open
open
always needed
open
always needed
open
open
open
always needed
www.austriamicrosystems.com
Revision 1.03
5 - 67
5 Page 
AS3608 2v2
Data Sheet - Detailed Description - Power Management Functions
8 Detailed Description - Power Management Functions
8.1 Low Drop Out Regulators
These LDOs are designed to supply sensitive analog circuits, audio devices, AD and DA converters, micro-controller and other peripheral
devices. The design is optimized to deliver the best compromise between quiescent current and regulator performance for battery powered
devices.
Stability is guaranteed with ceramic output capacitors of 1µF ±20% (X5R) or 2.2µF +100/-50% (Z5U). The low ESR of these caps ensures low
output impedance at high frequencies. Regulation performance is excellent even under low dropout conditions, when the power transistor has to
operate in linear mode. Power supply rejection is high enough to suppress high ripple on the battery at the output. The low noise performance
allows direct connection of noise sensitive circuits without additional filtering networks. The low impedance of the power device enables the
device to deliver up to 150mA even at nearly discharged batteries without any decrease of performance.
Figure 3. LDO Block Diagram
8.1.1 LDO5
This LDO generates the digital supply voltage used for the PMU itself.
Input Voltage is VSUP5
Output Voltage is VDD27 (typ. 2.7V), this LDO always starts at the beginning of the start-up sequence as it is needed for all further
operation. The default voltage cannot be changed in the boot ROM.
Driver strength: 100mA, can be programmed to 200mA
It is set to a default output voltage of 2.7V, 100mAmax. It supplies the analog and digital part of the PMU. Additional external loads are possible
but must not exceed the supply ratings in total together with the operating internal blocks. Further, the external load must not induce noise to the
VDD27.
www.austriamicrosystems.com
Revision 1.03
11 - 67
11 Page | ||
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| PDF Descargar | [ Datasheet AS3608.PDF ] | |
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