as3689 austriamicrosystems, as3689 Datasheet

as3689

Manufacturer Part Number

as3689

Description

Flexible Lighting Management Charge Pump, Dcdc Step Up, Current Sink, Adc, Ldo

Manufacturer

austriamicrosystems

Datasheet

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AS3689

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, 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

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

www.austriamicrosystems.com (ptr)

High-Efficiency Step Up DC/DC Converter

−

High-Efficiency High-Power Charge Pump

−

Supports up to 15 Current Sinks

−

AS3689

Up to 25V/50mA for White LEDs

Programmable Output Voltage with

External Resistors and Serial Interface

Overvoltage Protection

0.1Ohm Shunt Resistor

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, 1.8

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

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)

successor

Ω

typ. in 1:1.5)

Revision 1.0 / 20051205

the

−

Power- and lighting-management for mobile

telephones and other 1-cell Li+ or 3-cell NiMH

powered devices.

3 Application

−

Internal PWM Generation

8 Bit resolution

Logarithmic up/down dimming

Led Pattern Generator

Autonomous driving for Fun RGB LEDs

10-bit Successive Approximation ADC

−

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

−

Negative or High-Voltage Charge Pump

−

Programmable LDO (shared with RGB3)

−

Programmable via Serial Interface

Standby LDO always on

−

Wide Battery Supply Range: 3.0 to 5.5V

Two Wire Serial Interface Control

Overcurrent and Thermal Protection

Package: CSP 3 x 3 mm

Programmable Hardware Control (Strobe,

and Preview or PWM)

Selectively Enable/Disable Current Sinks

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

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

Regulated Output Voltage, Programmable

by Dual Resistors e.g. -6V, 10mA for

OLED or ±15V, 5mA for TFT

±5% Accuracy

1.85 to 3.4V, 150mA

Regulated 2.5V max. output 10mA

3µA Quiescent Current

Preliminary Product Brief, Confidential

austriamicrosystems

1 - 3

Related parts for as3689

as3689 Summary of contents

Page 1

... 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, low- ...

Page 2

... AS3689 Preliminary Product Brief, Confidential 4 Block Diagram Figure 1 – Application Diagram of the AS3689 AS3689 Lighting Management Battery Unit VBAT2 V2_5 References C4 Temperature 1µF RBIAS Supervision R1 220k 1.85-3.4V 150mA (Alternative Function) Battery or CPOUT Current Sinks 0.156-40mA RGB1 RGB2 RGB1 RGB3 (VANA) D17,D18,D19 OLED ...

Page 3

... AS3689 Preliminary Product Brief, Confidential Copyright Copyright © 1997-2005, 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. ...

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