AS3689 datasheet(3/72 Pages) AMSOSRAM

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AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

1 - 70

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, 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 two wire serial interface, and control logic

all onto a single device. Output voltages and output

currents are fully programmable.

The

AS3689

successor

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).

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. 3.0Ω max.

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

38.25mA

−

Three High Voltage Programmable (8-bit)

from: 0.15mA to 38.25mA (Keyboard

LEDs)

−

Six Programmable (8-bit) from: 0.15mA to

38.25mA (2 RGB LEDs)

−

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.

Datasheet, Confidential

AS3689

Flexible Lighting Management (Charge Pump, DCDC Step Up, Current

Sink, ADC, LDO)

AS3689 Datasheet(PDF) 3 Page - ams-OSRAM AG

AS3689 Datasheet(HTML) 3 Page - ams-OSRAM AG

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