AS3681 DB

AS3681 DB Datasheet

AS3681

Part	Datasheet
AS3681 DB	AS3681 DB (pdf)

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austriamicrosystems AS3681 Power & Lighting Management Unit 1 General Description The AS3681 is a highly-integrated, ultra-flexible CMOS Power- and Lighting Management Unit to supply power to LCD- and camera-modules in mobile telephones, and other 1-cell Li+ or 3-cell NIMH powered devices. The AS3681 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 serial interface, and control logic all onto a single die. The linear analog regulator features extremely high analog performance regarding: ! Noise < 30µVrms from 100Hz to 100kHz ! Line/load Regulation <1mV Static and <20mV Transient ! Power Supply Rejection ! Ultra-Low Power Consumption 1µA Shutdown, 6µA Standby LDO output voltages and output currents are programmable via a serial interface. 2 Key Features ! Programmable High-Performance Regulator - Low-Noise LDO to 3.4V, 100mA - 2.8V Default Output Voltage after Power-up - 3µA Quiescent Current in Standby Iout <5mA - Turns On/Off with Rising/Falling Edge of GPIO Supply Voltage - Programmable via Serial Interface ! High-Efficiency Step Up DC/DC Converter - Up to 25V/50mA for White LEDs - Programmable Output Voltage with External Resistors and Serial Interface ! High-Efficiency High-Power Charge Pump - 1:1, and 2:1 Mode - Output Current up to 400mA - Efficiency up to 95% - 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 11 Current Sinks - Three Programmable 4-bit from 10 to 150mA resp. 300mA - Two Programmable 4-bit from to mA - Three Programmable 4-bit from to mA for RGB LEDs - Three Programmable 4-bit from to 37.5mA for General Purpose Applications - Programmable Hardware Control Strobe, PWM - Selectively Enable/Disable Current Sinks ! 10-bit Successive Approximation ADC - 11µs Conversion Time - Two Selectable Inputs GPIO0 and GPIO1 ! Four General Purpose Inputs/Outputs - Digital Input, Digital Output, and Tristate - Programmable Pull-Up, and Pull-Down - GPIO2 can be used as Camera Flash Strobe ! 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 - Requires Few External Components ! Standby LDO - Regulated 2.5V - Maximum Output Current 10mA - Always On Supplies Internal Digital Blocks - 3µA Quiescent Current ! Wide Battery Supply Range to 5.5V ! Serial Interface Control ! On-Chip Bandgap Tuning for High Accuracy ±1% ! Overcurrent and Thermal Protection ! 32-Pin, Small Form-Factor QFN Package 5 x 5 x 1mm, 0.5mm pitch , Enhanced Thermal Characteristics ! 1 Watt Power Dissipation TAmbient = 70ºC 3 Application Power- and lighting-management for mobile telephones and other 1-cell Li+ or 3-cell NiMH powered devices. 1997-2004, austriamicrosystems USA, Inc. 8601 Six Forks Road, Suite 400 Raleigh,NC 27615 USA. All Rights Reserved. AS3681 Product Brief austriamicrosystems 4 Block Diagrams Figure Option by software Step Up DC/DC Converter Pins 23, 24, 28, 29 and External Charge Pump Pins 25, 26, Battery AS3681 Power Management Unit C2 1µF LDO e.g. 2.8V C3 2.2µF 2.5V C4 1µF

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austriamicrosystems

AS3681

Power & Lighting Management Unit
1 General Description

The AS3681 is a highly-integrated, ultra-flexible CMOS Power- and Lighting Management Unit to supply power to LCD- and camera-modules in mobile telephones, and other 1-cell Li+ or 3-cell NIMH powered devices. The AS3681 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 serial interface, and control logic all onto a single die.

The linear analog regulator features extremely high analog performance regarding:
! Noise < 30µVrms from 100Hz to 100kHz
! Line/load Regulation <1mV Static and <20mV Transient
! Power Supply Rejection ! Ultra-Low Power Consumption
1µA Shutdown, 6µA Standby

LDO output voltages and output currents are programmable via a serial interface.
2 Key Features
! Programmable High-Performance Regulator - Low-Noise LDO to 3.4V, 100mA - 2.8V Default Output Voltage after Power-up - 3µA Quiescent Current in Standby Iout <5mA - Turns On/Off with Rising/Falling Edge of GPIO Supply Voltage - Programmable via Serial Interface
! High-Efficiency Step Up DC/DC Converter - Up to 25V/50mA for White LEDs - Programmable Output Voltage with External Resistors and Serial Interface
! High-Efficiency High-Power Charge Pump - 1:1, and 2:1 Mode - Output Current up to 400mA - Efficiency up to 95% - 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 11 Current Sinks - Three Programmable 4-bit from 10 to 150mA resp. 300mA - Two Programmable 4-bit from to mA - Three Programmable 4-bit from to mA for RGB LEDs - Three Programmable 4-bit from to 37.5mA for General Purpose Applications - Programmable Hardware Control Strobe, PWM - Selectively Enable/Disable Current Sinks
! 10-bit Successive Approximation ADC - 11µs Conversion Time - Two Selectable Inputs GPIO0 and GPIO1
! Four General Purpose Inputs/Outputs - Digital Input, Digital Output, and Tristate - Programmable Pull-Up, and Pull-Down - GPIO2 can be used as Camera Flash Strobe
! 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 - Requires Few External Components
! Standby LDO - Regulated 2.5V - Maximum Output Current 10mA - Always On Supplies Internal Digital Blocks - 3µA Quiescent Current
! Wide Battery Supply Range to 5.5V
! Serial Interface Control
! On-Chip Bandgap Tuning for High Accuracy ±1%
! Overcurrent and Thermal Protection
! 32-Pin, Small Form-Factor QFN Package 5 x 5 x 1mm, 0.5mm pitch , Enhanced Thermal Characteristics
! 1 Watt Power Dissipation TAmbient = 70ºC
3 Application

Power- and lighting-management for mobile telephones and other 1-cell Li+ or 3-cell NiMH powered devices.
1997-2004, austriamicrosystems USA, Inc. 8601 Six Forks Road, Suite 400 Raleigh,NC 27615 USA. All Rights Reserved.

AS3681 Product Brief
austriamicrosystems
4 Block Diagrams

Figure Option by software Step Up DC/DC Converter Pins 23, 24, 28, 29 and External Charge Pump Pins 25, 26,

Battery

AS3681

Power Management Unit

C2 1µF

LDO e.g. 2.8V

C3 2.2µF
2.5V

C4 1µF

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Datasheet ID: AS3681 DB 519700