austriamicrosystems Product Brief AS3681 Power & Lighting Management Unit Supports up to 11 Current Sinks 1 General Description - Three Programmable (4-bit) from: 10 to 150mA resp. 300mA The AS3681 is a highly-integrated, ultra-flexible CMOS - Two Programmable (4-bit) from: 2.5 to 37.5 mA Power- and Lighting Management Unit to supply power to - Three Programmable (4-bit) from: 2.5 to 37.5 mA for LCD- and camera-modules in mobile telephones, RGB LEDs and other 1-cell Li+ or 3-cell NIMH powered devices. - Three Programmable (4-bit) from: 2.5 to 37.5mA for The AS3681 incorporates one low-power, low-dropout reg- General Purpose Applications ulator (LDO), one Step Up DC/DC Converter for white - Programmable Hardware Control (Strobe, PWM) backlight LEDs, one high-power Charge Pump for camera - Selectively Enable/Disable Current Sinks flash LEDs, one Analog-to-Digital Converter, support for up to 11 current sinks, a serial interface, and control logic all 10-bit Successive Approximation ADC onto a single die. - 11s Conversion Time The linear analog regulator features extremely high analog - Two Selectable Inputs: GPIO0 and GPIO1 performance regarding: Four General Purpose Inputs/Outputs Noise (< 30Vrms from 100Hz to 100kHz) - Digital Input, Digital Output, and Tristate Line/load Regulation - Programmable Pull-Up, and Pull-Down (<1mV Static and <20mV Transient) - GPIO2 can be used as Camera Flash Strobe Power Supply Rejection (>70dB 1kHz) Ultra-Low Power Consumption Negative or High-Voltage Charge Pump (1A Shutdown, 6A Standby) - Regulated Output Voltage, Programmable by Dual Resistors e.g. -6V, 10mA for OLED or 15V, 5mA for LDO output voltages and output currents are programma- TFT ble via a serial interface. - 5% Accuracy - Requires Few External Components 2 Key Features Standby LDO Programmable High-Performance Regulator - Regulated 2.5V - Low-Noise LDO (1.8 to 3.4V, 100mA) - Maximum Output Current 10mA - 2.8V Default Output Voltage after Power-up - Always On (Supplies Internal Digital Blocks) - 3A Quiescent Current in Standby (Iout <5mA) - 3A Quiescent Current - Turns On/Off with Rising/Falling Edge of GPIO Supply Voltage Wide Battery Supply Range: 3.0 to 5.5V - Programmable via Serial Interface Serial Interface Control High-Efficiency Step Up DC/DC Converter - Up to 25V/50mA for White LEDs On-Chip Bandgap Tuning for High Accuracy (1%) - Programmable Output Voltage with External Resis- tors and Serial Interface Overcurrent and Thermal Protection High-Efficiency High-Power Charge Pump 32-Pin, Small Form-Factor QFN Package - 1:1, 1.5:1 and 2:1 Mode (5 x 5 x 1mm, 0.5mm pitch), Enhanced Thermal Charac- - Output Current up to 400mA teristics - Efficiency up to 95% - Only 4 External Capacitors Required: 1 Watt Power Dissipation TAmbient = 70C 2 x 1F Flying Capacitors, 2 x 2.2F Input/Output Capacitors 3 Application - Supports LCD White Backlight LEDs, Camera Flash White LEDs, and Keypad Backlight Power- and lighting-management for mobile telephones LEDs 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. www.austriamicrosystems.com Revision 1.0 1 - 4AS3681 austriamicrosystems Product Brief 4 Block Diagrams Figure 1. Option (by software): Step Up DC/DC Converter (Pins 23, 24, 28, 29) and External Charge Pump (Pins 25, 26, 27). Battery R2 0.15 SENSE P 24 23 SENSE N 10H, 5x5x1.2mm SD12-100 Coiltronics AS3681 28 DCDC GATE C9 Power Management D1 2.2F R3 Step Up DC/DC Q1 C10 Unit 1M 1.5F Converter 29 DCDC FB R4 C11 VBAT3 21 100k 15nF LDO C2 Battery 1.85-3.4V 1F 150mA VANA 22 6 BAT1 V LDO e.g. 2.8V 3 VBAT2 C3 2.2F C5 2.2F 4 C2 P Charge Pump V2 5 30 2.5V C6 D9 D13 2 C2 N 1F 1:1, 1.5:1, 2:1 D10 D14 C4 White LEDs Bandgap RBIAS 32 1F 400mA Backlight and 7 C1 P D11 VREF R1 D12 C7 CREF 31 240k 8 C1 N 1F Camera Flash 5 CPOUT Module C1 100nF C8 2.2F D6 D7 D8 Current Sinks 10-150mA 9 CURR30 OLED FB 25 Pulse Skip Feedback 10 CURR31 R5 600k 11 CURR32 OLED2 27 D2 -6V O-LED 10mA C12 Charge Pump 100nF C15 D3 OLED1 26 2.2F Current Sinks 2.5-37.5mA C13 CURR1 19 100nF D4 CURR2 20 C14 100nF D5 18 CLK VDD G CLK R6 Serial 1-10k 17 DATA Interface GPIO/ 1 ADDR ADC Device Address Selector 14 16 15 13 12 30 GPIO0 GPIO1 GPIO2 GPIO3 Exposed Pad VDD G 1997-2004, austriamicrosystems USA, Inc. 8601 Six Forks Road, Suite 400 Raleigh,NC 27615 USA. All Rights Reserved. www.austriamicrosystems.com Revision 1.0 2 - 4