ams AS3689 Flexible lighting management (charge pump, dcdc step up, currentsink, adc, ldo) Datasheet

AS3689
Preliminary Product Brief, Confidential
austriamicrosystems
Preliminary Product Brief, Confidential
AS3689
Flexible Lighting Management (Charge Pump, DCDC Step Up, Current
Sink, ADC, LDO)
1 General Description
The AS3689 is a highly-integrated CMOS Power
and Lighting Management Unit to supply power to
LCD-and cameramodules in mobile telephones, and
other 1-cell Li+ or 3-cell NiMH powered devices.
The AS3689 incorporates one low-power, lowdropout regulator (LDO), one Step Up DC/DC
Converter for white backlight LEDs, one high-power
Charge Pump for camera flash LEDs, one Analogto-Digital Converter, support for up to 11 current
sinks, a two wire serial interface, and control logic
all onto a single device. Output voltages and output
currents are fully programmable.
The
AS3689
is
a
successor
to
the
austrimicrosystems AS3681 with several additional
features (Charge Pump Automatic Up Switching,
Extended timer features, autonomous logarithmic
and linear PWM dimming, LED pattern generator,
DCDC step up overvoltage protection, improved
Charge Pump and a fourth high current sink).
2 Key Features
High-Efficiency Step Up DC/DC Converter
− Up to 25V/50mA for White LEDs
− Programmable Output Voltage with
External Resistors and Serial Interface
− Overvoltage Protection
− 0.1Ohm Shunt Resistor
High-Efficiency High-Power Charge Pump
− 1:1, 1:1.5, and 1:2 Mode
− Automatic Up Switching (can be disabled
and 1:2 mode can be blocked)
− Output Current up to 400mA
− Efficiency up to 95%
− Very Low effective Resistance (0.5Ω typ.
1Ω max. in 1:1 mode, 1.8Ω typ. in 1:1.5)
− 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 15 Current Sinks
− Four Programmable (6-Bit) from: 0.6mA to
37.8mA
− Two Programmable (8-bit) from: 0.15mA to
38.5mA
− Three High Voltage Programmable (8-bit)
from: 0.15mA to 38.5mA (Keyboard LEDs)
− Six Programmable (8-bit) from: 0.15mA to
38.5mA (2 RGB LEDs)
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Programmable Hardware Control (Strobe,
and Preview or PWM)
− Selectively Enable/Disable Current Sinks
Internal PWM Generation
8 Bit resolution
Logarithmic up/down dimming
Led Pattern Generator
Autonomous driving for Fun RGB LEDs
10-bit Successive Approximation ADC
− 27µs Conversion Time
− Selectable Inputs: GPIO, GPI, all current
sources, VBAT, CP_OUT, DCDC_FB
− Internal Temp. Measurement
− Light Sensor, inluding a adjustable current
source (0-15uA) to V2_5
Support for automatic LED testing (open and
shorted LEDs can be identified)
Support for external Temperature Sensor for
high current LED protection (CURR3x)
Strobe Timeout protection
Up to 1600ms
Three different timing modes
2 General Purpose Inputs/Outputs
GPIO Input/Output, GPI only Input
− Digital Input, Digital Output, and Tristate
− Programmable Pull-Up, and Pull-Down
− GPI can be used as Flash Strobe
− GPIO can be used for Preview Mode
− GPIO can be used as PWM input
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
Programmable LDO (shared with RGB3)
− 1.85 to 3.4V, 150mA
Programmable via Serial Interface
Standby LDO always on
− Regulated 2.5V max. output 10mA
− 3µA Quiescent Current
Wide Battery Supply Range: 3.0 to 5.5V
Two Wire Serial Interface Control
Overcurrent and Thermal Protection
Package: CSP 3 x 3 mm
−
−
−
−
−
−
−
−
3 Application
Power- and lighting-management for mobile
telephones and other 1-cell Li+ or 3-cell NiMH
powered devices.
Revision 1.0 / 20051205
1-3
AS3689
Preliminary Product Brief, Confidential
austriamicrosystems
4 Block Diagram
Figure 1 – Application Diagram of the AS3689
Battery
R2
SENSE_P
Battery
AS3689
Lighting
Management
Unit
SENSE_N
L1
10µH
LED
Test
DCDC_GATE
Step Up DC/DC
Converter
C2
1µF
D1
R3
1M
C10
1.5nF
R4
100k
C11
15nF
C9
4.7µF
Q1
DCDC_FB
VBAT2
Battery
V2_5
C4
1µF
VBAT1
References
and
Temperature
Supervision
RBIAS
C5
1µF
C2_P
R1
220k
C2_N
C6
1µF
Charge Pump
LDO
1.85-3.4V 150mA
(Alternative Function)
C1_P
1:1, 1:1.5, 1:2
Battery or CPOUT
400mA
C1_N
Current Sinks
0.156-40mA
C7
1µF
D8
D11
D14
D9
D12
D15
D10
D13
D16
VSS_CP
RGB1
CPOUT
RGB2
RGB1
RGB3 (VANA)
Current Sinks
each 0.6-37.8mA
D17,D18,D19
OLED
Charge Pump
(Alternative Function)
LDO VANA
e.g. 2.8V
Battery or
CPOUT
C12
2.2µF
D3
D4
D5
C8
2.2µF
CURR31
CURR32
Current Sinks
0.15-38.5mA
CURR33
CURR41
CURR42
RGB2
D2
CURR30
Current Sinks
each 0.15-38.5mA
CURR43
CURR51
D6
D7
CURR52
D20,D21,D22
8Bit PWM
Generator
Automatic Dimming
and LED Pattern
Generator
HV Current Sinks
each 0.15-38.5mA
CURR1
CURR2
V2_5
CURR6
Vtemp
GPIO/
ADC
Strobe
Timer
CLK
Serial
Interface
GPIO
GPI
VDD_GPIO
VSS
DATA
CLK
VDD_GPIO
R5
1-10k
DATA
VSS
R6
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Revision 1.0 / 20051205
2-3
AS3689
Preliminary Product Brief, Confidential
austriamicrosystems
Copyright
Copyright © 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, AustriaEurope. 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 of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent identification 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 life-sustaining 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
Business Unit Communications
A 8141 Schloss Premstätten, Austria
T. +43 (0) 3136 500 0
F. +43 (0) 3136 5692
[email protected]
For Sales Offices, Distributors and Representatives, please visit:
www.austriamicrosystems.com
austriamicrosystems
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