AMSCO AS3681

austriamicrosystems
AS3681
Product Brief
Power & Lighting Management Unit
1 General Description
!
The AS3681 is a highly-integrated, ultra-flexible CMOS
Power- and Lighting 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 regulator (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 (>[email protected])
Ultra-Low Power Consumption
(1µA Shutdown, 6µA Standby)
!
LDO output voltages and output currents are programmable via a serial interface.
2 Key Features
!
!
!
Supports up to 11 Current Sinks
- Three Programmable (4-bit) from: 10 to 150mA resp. 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
Programmable High-Performance Regulator
- Low-Noise LDO (1.8 to 3.4V, 100mA)
- 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
!
!
Wide Battery Supply Range: 3.0 to 5.5V
High-Efficiency Step Up DC/DC Converter
- Up to 25V/50mA for White LEDs
- Programmable Output Voltage with External Resistors and Serial Interface
!
Serial Interface Control
!
On-Chip Bandgap Tuning for High Accuracy (±1%)
!
Overcurrent and Thermal Protection
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
!
!
32-Pin, Small Form-Factor QFN Package
(5 x 5 x 1mm, 0.5mm pitch), Enhanced Thermal Characteristics
1 Watt Power Dissipation @ TAmbient = 70ºC
3 Application
Power- and lighting-management for mobile telephones
and other 1-cell Li+ or 3-cell NiMH powered devices.
© 1997-2004, austriamicrosystems USA, Inc. 8601 Six Forks Road, Suite 400 Raleigh,NC 27615 USA. All Rights Reserved.
www.austriamicrosystems.com
Revision 1.0
1-4
austriam i c r o systems
AS368 1
Product Bri ef
4 Block Diagrams
Figure 1. Option (by software): Step Up DC/DC Converter (Pins 23, 24, 28, 29) and External Charge Pump (Pins
25, 26, 27).
Battery
R2
0.15Ω
SENSE_P
24
23
SENSE_N
10µH, 5x5x1.2mm
SD12-100
Coiltronics
AS3681
Power Management
Unit
28
C2
1µF
VANA
22
R3
1MΩ
C10
1.5µF
R4
100kΩ
C11
15nF
DCDC_FB
21
LDO
1.85-3.4V
150mA
C9
2.2µF
D1
Q1
29
VBAT3
DCDC_GATE
Step Up DC/DC
Converter
Battery
6
VBAT1
3
VBAT2
4
C2_P
2
C2_N
LDO
e.g. 2.8V
C3
2.2µF
V2_5
2.5V
Charge Pump
30
1:1, 1.5:1, 2:1
C4
1µF
RBIAS
R1
240kΩ
CREF
C5
2.2µF
Bandgap
and
VREF
32
400mA
31
C6
1µF
White LEDs
Backlight
7
C1_P
8
C1_N
5
CPOUT
OLED_FB
Feedback
25
C15
2.2µF
OLED2
D2
27
D4
10
CURR31
11
CURR32
19
CURR1
20
CURR2
18
CLK
17
DATA
1
ADDR
D8
C8
2.2µF
O-LED
Charge Pump
C12
100nF
D3
CURR30
D7
Pulse Skip
R5
600kΩ
-6V
10mA
9
D14
D11
Camera Flash
Module
C1
100nF
Current Sinks
10-150mA
D13
D10
D12
C7
1µF
D6
D9
OLED1
26
Current Sinks
2.5-37.5mA
C13
100nF
C14
100nF
D5
CLK
Serial
Interface
GPIO/
ADC
R6
1-10kΩ
VDD_G
Device Address Selector
16
15
13
12
GPIO0
GPIO1
GPIO2
GPIO3
14
30
VDD_G
Exposed Pad
© 1997-2004, austriamicrosystems USA, Inc. 8601 Six Forks Road, Suite 400 Raleigh,NC 27615 USA. All Rights Reserved.
www.austriamicrosystems.com
Revision 1.0
2-4
austriam i c r o systems
AS368 1
Product Bri ef
Figure 2. Option (by software): General Purpose Current Sinks (Pins 23, 24, 28, 29) and External Charge Pump
(Pins 25, 26, 27).
CURR53
24
23
CURR52
D18
AS3681
Power Management
Unit
28
D19
CURR51
NC
29
CURR4
D20
VBAT3
C2
1µF
VANA
21
Current Sinks
2.5-37.5mA
LDO
1.85-3.4V
150mA
22
Battery
6
VBAT1
3
VBAT2
4
C2_P
2
C2_N
7
C1_P
8
C1_N
5
CPOUT
LDO
e.g. 2.8V
C3
2.2µF
V2_5
2.5V
Charge Pump
30
1:1, 1.5:1, 2:1
C4
1µF
RBIAS
R1
240kΩ
CREF
Bandgap
and
VREF
32
400mA
31
C1
100nF
Current Sinks
10-150mA
Current Sinks
2.5-37.5mA
CP_OUT or VBAT
RGB
LEDs D15 D16
D17
RGB1
25
RGB2
27
RGB3
26
C5
2.2µF
Current SInks
2.5-37.5mA
C6
1µF
C7
1µF
Camera Flash
Module
D6
9
CURR30
10
CURR31
11
CURR32
19
CURR1
20
CURR2
D7
D8
C8
2.2µF
D21
D22
Serial
Interface
GPIO/
ADC
18
CLK
17
DATA
1
ADDR
VDD_G
R6
1-10kΩ
Device Address Selector
16
15
13
12
GPIO0
GPIO1
GPIO2
GPIO3
14
VDD_GP
30
Exposed Pad
© 1997-2004, austriamicrosystems USA, Inc. 8601 Six Forks Road, Suite 400 Raleigh,NC 27615 USA. All Rights Reserved.
www.austriamicrosystems.com
Revision 1.0
3-4
austriam i c r o systems
AS368 1
Product Bri ef
Copyrights
Copyright © 1997-2004, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information.
This product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for
each application.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
e-mail: [email protected]
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com
a u s t r i am i c r o s y s t e m s
– a leap ahead in mixed signal
© 1997-2004, austriamicrosystems USA, Inc. 8601 Six Forks Road, Suite 400 Raleigh,NC 27615 USA. All Rights Reserved.
www.austriamicrosystems.com
Revision 1.0
4-4