AS3689-T

AS3689-T Datasheet

AS3689 Product Brief

Part	Datasheet
AS3689-T	AS3689-T (pdf)

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AS3689 Product Brief 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, 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 typ. 1Ω max. in 1:1 mode, typ. max. in − 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 − 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 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 AS3689 Product Brief 4 Block Diagram Figure 1 Application Diagram of the AS3689 Battery 1µF Battery C4 1µF R1 220k VBAT2 V2_5 RBIAS Battery or CPOUT RGB1 RGB1 RGB2 RGB3 VANA D17,D18,D19 LDO VANA e.g. 2.8V Battery or CPOUT C12 2.2µF CURR41 RGB2

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AS3689 Product Brief

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, 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 typ. 1Ω max. in 1:1 mode, typ. max. in − 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 − 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 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

AS3689 Product Brief
4 Block Diagram

Figure 1 Application Diagram of the AS3689

Battery
1µF

Battery

C4 1µF

R1 220k

VBAT2 V2_5

RBIAS

Battery or CPOUT

RGB1

RGB1

RGB2

RGB3 VANA

D17,D18,D19

LDO VANA e.g. 2.8V

Battery or CPOUT

C12 2.2µF

CURR41

RGB2

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Datasheet ID: AS3689-T 519701