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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: ! ! ! Product Brief Supports up to 11 Current Sinks - Three Programmable (4-bit) from: 10 to 150mA resp. 300mA - Two Programmable (4-bit) from: 2.5 to 37.5 mA - Three Programmable (4-bit) from: 2.5 to 37.5 mA for RGB LEDs - Three Programmable (4-bit) from: 2.5 to 37.5mA for General Purpose Applications - Programmable Hardware Control (Strobe, PWM) - Selectively Enable/Disable Current Sinks 10-bit Successive Approximation ADC - 11s 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) - 3A Quiescent Current Wide Battery Supply Range: 3.0 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 = 70C ! Noise (< 30Vrms from 100Hz to 100kHz) Line/load Regulation (<1mV Static and <20mV Transient) Power Supply Rejection (>70dB@1kHz) Ultra-Low Power Consumption (1A Shutdown, 6A Standby) ! ! ! ! LDO output voltages and output currents are programmable via a serial interface. 2 Key Features ! Programmable High-Performance Regulator - Low-Noise LDO (1.8 to 3.4V, 100mA) - 2.8V Default Output Voltage after Power-up - 3A 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, 1.5:1 and 2:1 Mode - Output Current up to 400mA - Efficiency up to 95% - Only 4 External Capacitors Required: 2 x 1F Flying Capacitors, 2 x 2.2F Input/Output Capacitors - Supports LCD White Backlight LEDs, Camera Flash White LEDs, and Keypad Backlight LEDs ! ! ! ! ! ! ! ! ! 3 Application Power- and lighting-management for mobile telephones and other 1-cell Li+ or 3-cell NiMH powered devices. (c) 1997-2004, austriamicrosystems USA, Inc. 8601 Six Forks Road, Suite 400 Raleigh,NC 27615 USA. All Rights Reserved. www.austriamicrosystems.com Revision 1.0 1-4 AS368 1 Product Bri ef austriam i c r o systems 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 AS3681 Power Management Unit 28 DCDC_GATE Q1 29 DCDC_FB 10H, 5x5x1.2mm SD12-100 Coiltronics D1 R3 1M C10 1.5F Step Up DC/DC Converter C9 2.2F VBAT3 C2 1F LDO e.g. 2.8V C3 2.2F V2_5 21 R4 100k C11 15nF VANA 22 LDO 1.85-3.4V 150mA Battery 6 VBAT1 3 VBAT2 C5 2.2F C6 1F White LEDs Backlight C7 1F Camera Flash Module C8 2.2F D9 D10 D11 D12 D13 D14 4 2.5V C4 1F R1 240k 30 C2_P Charge Pump 1:1, 1.5:1, 2:1 2 C2_N RBIAS 32 Bandgap and VREF 400mA 7 C1_P CREF 31 8 5 C1_N CPOUT C1 100nF Current Sinks 10-150mA Feedback R5 600k -6V 10mA C15 2.2F D2 C12 100nF D3 C13 100nF OLED1 26 OLED2 27 OLED_FB 25 Pulse Skip D6 9 10 11 CURR30 CURR31 CURR32 D7 D8 O-LED Charge Pump Current Sinks 2.5-37.5mA 19 CURR1 D4 C14 100nF D5 20 CURR2 18 CLK CLK DATA ADDR R6 1-10k VDD_G GPIO/ ADC Serial Interface 17 1 Device Address Selector 16 GPIO0 15 GPIO1 13 GPIO2 12 GPIO3 14 VDD_G 30 Exposed Pad (c) 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 AS368 1 Product Bri ef austriam i c r o systems Figure 2. Option (by software): General Purpose Current Sinks (Pins 23, 24, 28, 29) and External Charge Pump (Pins 25, 26, 27). CURR53 24 23 CURR52 D18 AS3681 Power Management Unit 28 CURR51 NC D19 29 CURR4 D20 VBAT3 C2 1F LDO e.g. 2.8V C3 2.2F V2_5 21 VANA 22 LDO 1.85-3.4V 150mA Current Sinks 2.5-37.5mA Battery 6 VBAT1 3 VBAT2 C5 2.2F C6 1F 4 2.5V C4 1F R1 240k 30 C2_P Charge Pump 1:1, 1.5:1, 2:1 2 C2_N RBIAS 32 Bandgap and VREF 400mA 7 C1_P C7 1F Camera Flash Module C8 2.2F CREF 31 8 5 C1_N CPOUT C1 100nF Current Sinks 10-150mA CP_OUT or VBAT RGB LEDs D15 D16 RGB1 25 D6 9 10 11 CURR30 CURR31 CURR32 D7 D8 Current Sinks 2.5-37.5mA D17 RGB2 27 RGB3 26 Current SInks 2.5-37.5mA 19 CURR1 D21 20 CURR2 D22 18 CLK DATA ADDR GPIO/ ADC Serial Interface 17 1 VDD_G R6 1-10k Device Address Selector 16 GPIO0 15 GPIO1 13 GPIO2 12 GPIO3 14 VDD_GP 30 Exposed Pad (c) 1997-2004, austriamicrosystems USA, Inc. 8601 Six Forks Road, Suite 400 Raleigh,NC 27615 USA. All Rights Reserved. www.austriamicrosystems.com Revision 1.0 3-4 AS368 1 Product Bri ef austriam i c r o systems Copyrights Copyright (c) 1997-2004, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). 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. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG A-8141 Schloss Premstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 e-mail: info@austriamicrosystems.com For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com a u s t r i am i c r o s y s t e m s - a leap ahead in mixed signal 4-4 (c) 1997-2004, austriamicrosystems USA, Inc. 8601 Six Forks Road, Suite 400 Raleigh,NC 27615 USA. All Rights Reserved. www.austriamicrosystems.com Revision 1.0 |
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