AS3675 datasheet(2/81 Pages) AMSCO

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AS3675

Flexible Lighting Management Unit (Charge Pump, DCDC, 13

Current Sinks, ADC, LED Test, LDO, Audio Controlled Light)

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Datasheet

1 General Description

The AS3675 is a highly-integrated CMOS Power and

Lighting Management Unit for mobile telephones, and

other 1-cell Li+ or 3-cell NiMH powered devices.

The AS3675 incorporates one Step Up DC/DC Con-

verter for white backlight LEDs, one high-power Charge

Pump, one Analog-to-Digital Converter, 13 current sinks,

the RGB and white LEDs can be controlled by an audio

input, LED in-circuit function test, a two wire serial inter-

face, and control logic all onto a single device. Output

voltages and output currents are fully programmable.

The AS3675 is part of to the austriamicrosystems

AS3676, AS3687/87XM and AS3689 lighting mange-

ment units family. It is software compatible to AS3687/

87XM and AS3689 and pin and software compatible to

AS3676.

2 Key Features

High-Efficiency Step Up DC/DC Converter

- Up to 16V/55mA (or 25V/35mA) for White LEDs

- Programmable Output Voltage with External Resis-

tors and Serial Interface

- Over voltage Protection

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 300mA/500mA pulsed

- Efficiency up to 95%

- Very Low effective Resistance (2.5

Ω 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, or RGB

LEDs

13 Current Sinks

- All 13 current sinks fully Programmable (8-bit)

from: 0.15mA to 38.5mA (up to 75.6mA for

CURR30...CURR33)

- Three current sinks are High Voltage capable

(CURR1, CURR2, CURR6)

- Programmable Hardware Control (Strobe, and Pre-

view or PWM)

- Selectively Enable/Disable Current Sinks

Internal PWM Generation

- 8 Bit resolution

- Autonomous Logarithmic up/down dimming

Led Pattern Generator

- Autonomous driving for Fun RGB LEDs

- Support indicator LEDs

10-bit Successive Approximation ADC

- 27µs Conversion Time

- Selectable Inputs: GPIO, all current sources,

VBAT, CPOUT, DCDC_FB

- Internal Temp. Measurement

- Light Sensor input

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

Two General Purpose Inputs/Output

- VANA/GPI Input, GPIO Input/Output

- Digital Input, Digital Output using VANA/GPI sup-

ply and Tristate

- VANA/GPI internal pull down

- GPIO Programmable Pull-Up/Down

Programmable LDO

- 1.85 to 3.4V, 150mA

- Programmable via Serial Interface

Standby LDO always on

- Regulated 2.5V max. output 10mA

- 3µA Quiescent Current

Audio can be used to drive RGB LED or up to four

white LEDs

- RGB Color and Brightness is dependent on audio

input amplitude or frequency

White LEDs can be controlled by amplitude or fre-

quency (different modes like bar-type or two and two

LEDs driven by frequency filters)

Wide Battery Supply Range: 3.0 to 5.5V

Two Wire Serial Interface Control

Over current and Thermal Protection

WL-CSP30 3x2.5mm, 0.5mm pitch Package

3 Applications

Power- and lighting-management for mobile telephones

and other 1-cell Li+ or 3-cell NiMH powered devices.

AS3675 数据表(PDF) 2 Page - ams AG

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