Management Unit. AS3681 Datasheet

AS3681 Unit. Datasheet pdf. Equivalent

AS3681 Datasheet
Recommendation AS3681 Datasheet
Part AS3681
Description Power and Lighting Management Unit
Feature AS3681; austriamicrosystems AS3681 Power & Lighting Management Unit 1 General Description The AS3681 is a hi.
Manufacture austriamicrosystems
Datasheet
Download AS3681 Datasheet




austriamicrosystems AS3681
austriamicrosystems
AS3681
Power and Lighting Management Unit
Data Sheet
1 General Description
The AS3681 is a highly-integrated CMOS Power and Light-
ing Management Unit to supply power to LCD-and camera-
modules in mobile telephones, and other 1-cell Li+ or 3-cell
NiMH powered devices.
The AS3681 incorporates one low-power, low-dropout reg-
ulator (LDO), one Step Up DC/DC Converter for white
backlight LEDs, one high-power Charge Pump for camera
flash LEDs, one Analog-to-Digital Converter, support for up
to 11 current sinks, a serial interface, and control logic all
onto a single die.
The linear analog regulator features extremely high analog
performance regarding:
! Noise (< 30µVrms from 100Hz to 100kHz)
! Line/load Regulation
(<1mV Static and <20mV Transient)
! Power Supply Rejection (>70dB@1kHz)
! Ultra-Low Power Consumption
(1µA Shutdown, 6µA Standby)
LDO output voltages and output currents are programma-
ble via a serial interface.
2 Key Features
! Programmable High-Performance Regulator
- Low-Noise LDO (1.85 to 3.4V, 150mA)
- 2.8V Default Output Voltage after Power-up
- 3µA Quiescent Current in Standby (Iout <5mA)
- Turns On/Off with Rising/Falling Edge of GPIO
Supply Voltage
- Programmable via Serial Interface
! High-Efficiency Step Up DC/DC Converter
- Up to 25V/50mA for White LEDs
- Programmable Output Voltage with External Resistors
and Serial Interface
! High-Efficiency High-Power Charge Pump
- 1:1, 1.5:1, and 2:1 Mode
- Output Current up to 400mA
- Efficiency up to 95%
- Only 4 External Capacitors Required:
2 x 1µF Flying Capacitors, 2 x 2.2µF Input/Output
Capacitors
- Supports LCD White Backlight LEDs,
Camera Flash White LEDs, and Keypad Backlight
LEDs
! Supports up to 11 Current Sinks
- Three Programmable (4-bit) from: 10 to 300mA
- Two Programmable (4-bit) from: 2.5 to 37.5 mA
- Three Programmable (4-bit) from: 2.5 to 37.5 mA for
RGB LEDs
- Three Programmable (4-bit) from: 2.5 to 37.5mA for
General Purpose Applications
- Programmable Hardware Control (Strobe, PWM)
- Selectively Enable/Disable Current Sinks
! 10-bit Successive Approximation ADC
- 11µs Conversion Time
- Two Selectable Inputs: GPIO0 and GPIO1
! Four General Purpose Inputs/Outputs
- Digital Input, Digital Output, and Tristate
- Programmable Pull-Up, and Pull-Down
- GPIO2 can be used as Camera Flash Strobe
! Negative or High-Voltage Charge Pump
- Regulated Output Voltage, Programmable by Dual
Resistors e.g. -6V, 10mA for OLED or ±15V, 5mA for
TFT
- ±5% Accuracy
- Requires Few External Components
! Standby LDO
- Regulated 2.5V
- Maximum Output Current 10mA
- Always On (Supplies Internal Digital Blocks)
- 3µA Quiescent Current
! Wide Battery Supply Range: 3.0 to 5.5V
! Serial Interface Control
! On-Chip Bandgap Tuning for High Accuracy (±1%)
! Overcurrent and Thermal Protection
! 32-Pin, Small Form-Factor QFN Package
(5 x 5 x 1mm, 0.5mm pitch), Enhanced Thermal Charac-
teristics
! 1 Watt Power Dissipation @ TAMB = 70ºC
3 Application
Power- and lighting-management for mobile telephones
and other 1-cell Li+ or 3-cell NiMH powered devices.
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Revision 2.07
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austriamicrosystems AS3681
AS3681
Data Sheet
austriamicrosystems
4 Block Diagrams
Figure 1. Serial LED Configuration Option (by software): Step Up DC/DC Converter (Pins 23, 24, 28, 29) and
External Charge Pump (Pins 25, 26, 27)
Battery
AS3681
Power and Lighting
Management Unit
Battery
VBAT3 21
LDO
e.g. 2.8V
C3
2.2µF
2.5V
C4
1µF
R1
240kΩ
VANA 22
V2_5 30
RBIAS 32
CREF 31
C1
100nF
LDO
1.85-3.4V
150mA
Bandgap
and
VREF
Feedback
OLED_FB 25
R5
600kΩ
-6V
10mA
C15
2.2µF
D2 OLED2 27
C12
100nF
D3 OLED1 26
C13
100nF
D4
C14
100nF
D5
O-LED
Charge Pump
R2
0.15Ω
C2
1µF
SENSE_P 24 23 SENSE_N
10µH, 5x5x1.2mm
SD12-100
Coiltronics
Step Up DC/DC
Converter
28 DCDC_GATE
Q1
29 DCDC_FB
D1
R3
1MΩ
C10
1.5nF
6 VBAT1
R4
100kΩ
Battery
C11
15nF
C9
2.2µF
Charge Pump
1:1, 1.5:1, 2:1
400mA
Current Sinks
10-300mA
3 VBAT2
4 C2_P
C5
2.2µF
2 C2_N
C6
1µF
7 C1_P
8 C1_N
C7
1µF
White LEDs
Backlight
5 CPOUT
D6
Camera Flash
Module
D7 D8
C8
2.2µF
9 CURR30
D9 D13
D10 D14
D11
D12
10 CURR31
11 CURR32
Current Sinks
2.5-37.5mA
19 CURR1
20 CURR2
GPIO/
ADC
16
GPIO0
15
GPIO1
13
GPIO2
12
GPIO3
Serial
Interface
14
VDD_GPIO
17 CLK
18 DATA
1 ADDR
CLK
VDD_GPIO
R6
1-10kΩ
Device Address Selector
33
Exposed Pad
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Revision 2.07
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austriamicrosystems AS3681
AS3681
Data Sheet
austriamicrosystems
Figure 2. Parallel LED Configuration Option (by software): General Purpose Current Sinks (Pins 23, 24, 28, 29)
and RGB LED Current Sinks (Pins 25, 26, 27)
AS3681
Power and Lighting
Management Unit
Battery
C2
1µF
LDO
e.g. 2.8V
C3
2.2µF
2.5V
C4
1µF
R1
240kΩ
VBAT3 21
VANA 22
V2_5 30
RBIAS 32
CREF 31
C1
100nF
LDO
1.85-3.4V
150mA
Bandgap
and
VREF
VDD_GPIO
R6
1-10kΩ
Device Address Selector
CLK 17
DATA 18
ADDR 1
VDD_GPIO 14
Serial
Interface
GPIO/
ADC
Charge Pump
1:1, 1.5:1, 2:1
400mA
Current Sinks
2.5-37.5mA
6 VBAT1
Battery
3 VBAT2
4 C2_P
2 C2_N
C5
2.2µF
C6
1µF
7 C1_P
8 C1_N
5 CPOUT
C7
1µF
CP_OUT or
VBAT
28 CURR51
NC
24 CURR53
23 CURR52
29 CURR4
D18
D19
D20
C8
2.2µF
Current Sinks
10-300mA
Current SInks
2.5-37.5mA
9 CURR30
10 CURR31
11 CURR32
19 CURR1
20 CURR2
D6
D7
Camera Flash
Module
D8
D21
D22
Current Sinks
2.5-37.5mA
25 RGB1
26 RGB2
27 RGB3
D17
D16 RGB
LEDs
D15
16
GPIO0
15
GPIO1
13
GPIO2
12
GPIO3
33
Exposed Pad
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Revision 2.07
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