AS1101, AS1102, AS1103, AS1104 Data Sheet Low-Dropout LED Drivers 1 General Description 2 Key Features The AS1101/AS1102/AS1103/AS1104 are LED drivers ! LED Drivers for Parallel-Connected LEDs designed to match current source bias for any color ! Ultra-Low Voltage Drop: Less Than 150mV (for Li- LED, including white and blue. The devices can drive up ion Battery Support) to 4 high-current LEDs, and the LED current is program- ! Analog and PWM Brightness Control mable using an external resistor (RSET). ! Up to 80mA per LED (AS1101) The AS1101 LED currents are 460 x ISET (per LED, typ) at an LED cathode voltage (VSAT) of 150mV and 650 x ! Up to 40mA per LED (AS1102, AS1103, AS1104) ISET (typ) at a VSAT of 1V, where ISET is the current ! No Electromagnetic Interference, No Switching- through RSET connected to pin CTRL. Noise The AS1102, AS1103, and AS1104 LED currents are ! Current-Matching Requires No External Compo- 230 x ISET (per LED, typ) at a VSAT of 150mV and 325 x nents ISET (typ) at a VSAT of 1V. ! Active-Low Shutdown Mode (AS1101, AS1102, The AS1101, AS1102, and AS1104 incorporate a chip- andAS1103) enable feature via pin ON. When the devices are dis- ! Low Shutdown-Current: Less Than 1µA abled, the supply current drops to less than 1µA. ! SC70-6 Package (AS1101, AS1102, and AS1103) The AS1101, AS1102, and AS1103 are available in a 6-pin SC70 package; the AS1104 is available in a 8-pin ! MSOP-8 Package (AS1104) MSOP package. 3 Applications The AS110x devices are ideal for LED displays and key- board backlights, as well as lighting management units for battery powered audio devices such as MP3 and CD Figure 1. Typical Application Diagrams players, mobile and cordless phones, PDAs, portable DVD players, and consumer electronics. 2 Diode Control with Enable 3 Diode Control with Enable VIN VIN I1/I2 VSAT I3/I4 I1 VSAT I2 I3 ISET ISET VSET VSET (3V) RSET CTRL AS1101 (3V) RSET CTRL AS1102 ENABLE ENABLE ON ON GND GND 4 Diode Control 4 Diode Control with Enable VIN VIN I1 VSAT I2 I3 I4 I1 VSAT I2 I3 I4 ISET ISET VSET VSET AS1103 (3V) RSET CTRL AS1104 (3V) RSET CTRL ENABLE ON GND GND www.austriamicrosystems.com Revision 1.5 1 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Pinout 4 Pinout Pin Assignments Figure 2. Pin Assignments – (Top View) CTRL 1 6 ON CTRL 1 6 ON CTRL 1 6 I3 I1/I2 2 AS1101 5 I3/I4 I2 2 AS1102 5 I3 I2 2 AS1103 5 I4 N/C 3 4 GND I1 3 4 GND I1 3 4 GND 6-Pin SC70 ON 1 8 N/C I3 2 7 CTRL AS1104 I4 3 6 I2 GND 4 5 I1 8-Pin MSOP Pin Descriptions Table 1. Pin Descriptions Pin Number Pin Name Description CTRL Sets LED current; connect to external resistor. I1 Connect to cathode of LED. I2 Connect to cathode of LED. (see Figure 2) I3 Connect to cathode of LED. I4 Connect to cathode of LED. GND Ground ON Device Enable Input. www.austriamicrosystems.com Revision 1.5 2 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Absolute Maximum Ratings 5 Absolute Maximum Ratings Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those listed in Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reli- ability. Table 2. Absolute Maximum Ratings Parameter Min Max Unit Comment VI1, VI2, VI3, VI4, CTRL and ON Voltage to GND -0.3 5 V 200 mW SC70-6 Power Dissipated by Device at TAMB = 85°C 250 mW MSOP-8 I1, I2, I3, I4 Steady State Current 100 mA Package Body Temperature † 260 ºC Junction Temperature 150 ºC Storage Temperature -65 150 ºC Human Body Model; Electrostatic Discharge Protection (ESD) Level 2 kV Norm: MIL-STD883E 3015 methods. † The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-020C “Mois- ture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices”. Operating Conditions Table 3. Recommended Operating Conditions Parameter Min Typ Max Unit Comments LED Cathode Voltage 0.15 0.6 3.6 V Enable Voltage ON Mode † 2.2 3.0 3.6 V Enable Voltage OFF Mode † 0 0.2 0.5 V Ambient Temperature -40 25 85 ºC † Not applicable to AS1103. www.austriamicrosystems.com Revision 1.5 3 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Electrical Characteristics 6 Electrical Characteristics AS1101 Electrical Characteristics TAMB = 25°C (unless otherwise noted). Table 4. Electrical Characteristics – AS1101 Parameter Symbol Conditions Min Typ Max Units ISET Range ISET VON = 3V 25 150 µA Output Current Multiplication Ratio OCMR ISET = 25µA, VSAT = 150mV, VON = 3V 350 500 650 Output Current Multiplication Ratio OCMR ISET = 40µA, VSAT = 150mV, VON = 3V 335 480 625 Output Current Multiplication Ratio OCMR ISET = 75µA, VSAT = 150mV, VON = 3V 295 420 545 Output Current Multiplication Ratio OCMR ISET = 25µA, VSAT = 600mV, VON = 3V 435 620 805 Output Current Multiplication Ratio OCMR ISET = 40µA, VSAT = 600mV, VON = 3V 425 610 795 Output Current Multiplication Ratio OCMR ISET = 75µA, VSAT = 600mV, VON = 3V 415 590 765 Output Current Multiplication Ratio OCMR ISET = 25µA, VSAT = 1000mV, VON = 3V 470 670 870 Output Current Multiplication Ratio OCMR ISET = 40µA, VSAT = 1000mV, VON = 3V 460 660 860 Output Current Multiplication Ratio OCMR ISET = 75µA, VSAT = 1000mV, VON = 3V 440 630 820 LED-to-LED Current Matching Match VON = 3V -3 3 % ISET in OFF Mode ISET,OFF VCTRL = 3V, VSAT = 3V, VON = 0V 0.1 1 µA VCTRL = 3V, VSAT = 3V, VON = 0V, 0.1 1 IIN in OFF Mode IIN,OFF TAMB = 25ºC µA VCTRL = 3V, VSAT = 3V, VON = 0V 4 Peak Efficiency † η VIN = 3V, VON = 3V 95 % † Efficiency = (VIN - VSAT)/VIN. Information parameter, guaranteed by design. AS1102, AS1103, AS1104 Electrical Characteristics TAMB = 25°C (unless otherwise noted). Table 5. Electrical Characteristics – AS1102, AS1103, AS1104 Parameter Symbol Conditions Min Typ Max Units ISET Range ISET VON = 3V 25 150 µA Output Current Multiplication Ratio OCMR ISET = 25µA, VSAT = 150mV, VON = 3V 175 250 325 Output Current Multiplication Ratio OCMR ISET = 40µA, VSAT = 150mV, VON = 3V 170 240 310 Output Current Multiplication Ratio OCMR ISET = 75µA, VSAT = 150mV, VON = 3V 145 210 275 Output Current Multiplication Ratio OCMR ISET = 25µA, VSAT = 600mV, VON = 3V 215 310 405 Output Current Multiplication Ratio OCMR ISET = 40µA, VSAT = 600mV, VON = 3V 215 305 395 Output Current Multiplication Ratio OCMR ISET = 75µA, VSAT = 600mV, VON = 3V 205 295 385 Output Current Multiplication Ratio OCMR ISET = 25µA, VSAT = 1000mV, VON = 3V 235 335 435 Output Current Multiplication Ratio OCMR ISET = 40µA, VSAT = 1000mV, VON = 3V 230 330 430 Output Current Multiplication Ratio OCMR ISET = 75µA, VSAT = 1000mV, VON = 3V 220 315 410 www.austriamicrosystems.com Revision 1.5 4 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Electrical Characteristics Table 5. Electrical Characteristics – AS1102, AS1103, AS1104 Parameter Symbol Conditions Min Typ Max Units LED-to-LED Current Matching Match VON = 3V -3 3 % ISET in OFF Mode 1 ISET,OFF VCTRL = 3V, VSAT = 3V, VON = 0V 0.1 1 µA VCTRL = 3V, VSAT = 3V, VON = 0V, 0.1 1 IIN in OFF Mode 1 IIN,OFF TAMB = 25°C µA VCTRL = 3V, VSAT = 3V, VON = 0V 2 Peak Efficiency 2 η VIN = 3V, VON = 3V 95 % 1.Not applicable to AS1103. 2.Efficiency = (VIN - VSAT) / VIN. Information parameter, guaranteed by design. www.austriamicrosystems.com Revision 1.5 5 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Typical Performance Characteristics 7 Typical Performance Characteristics Figure 3. Set Current vs. VCTRL Figure 4. Set Current vs.VSET; RSET = 30kΩ 100 100 90 90 80 80 70 70 µA) e 5600 A) e 5600 I (SET 3400 I (µSET 3400 20 20 10 10 0 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0.00.1 0.20.30.40.5 0.60.70.80.9 1.01.1 V (V) V (V) CTRL SET Figure 5. AS1101 ILED vs. VSAT Figure 6. AS1102, AS1103, AS1104 ILED vs. VSAT 35 30 ISET = 100µA 30 25 ISET = 50µA 25 A) e A) e 20 m 20 m I (LED 15 ISET = 25µA I (LED 15 ISET = 50µA 10 10 ISET = 25µA 5 5 0.0 0.2 0.4 0.6 0.8 1.0 0.0 0.2 0.4 0.6 0.8 1.0 VSAT (V) VSAT (V) Figure 7. AS1101 OMCR vs. ISET Figure 8. AS1102, AS1103, AS1104 OMCR vs. ISET 700 350 600 300 500 250 R 400 R 200 M M C 300 C 150 O O 200 100 100 50 0 0 0 20 40 60 80 100 120 140 160 0 20 40 60 80 100 120 140 160 I (µA) I (µA) SET SET www.austriamicrosystems.com Revision 1.5 6 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Typical Performance Characteristics Figure 9. AS1102, AS1103, AS1104 ILED vs. RSET, Figure 10. AS1102, AS1103, AS1104 ILED vs. RSET; VSET = 3V VSET = 3V 2222 35 VVSSAATT == 00..55VV VSAT = 1V 2200 VVSSAATT == 00..66VV 30 1188 VSAT = 0.6V 25 1166 A) eA) e 1144 A) e 20 mm m I (I (LEDLED 11110202 VVSSAATT == 00..44VV I (LED 15 10 88 VVSSAATT == 00..33VV VSAT = 0.3V 66 5 VSAT = 0.15V 44 0 00 2200 4400 6600 8800 110000 112200 114400 116600 0 20 40 60 80 100120140160180200 RRSSEETT ((kkΩΩ)) RSET (kΩ) Figure 11. AS1101 ILED vs. RSET; VSET = 3V Figure 12. ILED vs. Temp; VLED = -0.25V, ISET = 50µA 22 13 VSAT = 0.15V VSAT = 0.30V 20 VSAT = 0.25V 18 12.5 16 e VSAT = 0.20V e ) 14 ) A A m 12 m 12 ( ( ED 10 VSAT = 0.10V ED IL VSAT = 0.05V IL 8 11.5 6 4 2 11 10 20 30 40 50 60 70 80 90 100 -40 -20 0 20 40 60 80 100 R (kΩ) SET Temperature (°C) Figure 13. AS1101 ILED vs. ISET Figure 14. AS1102, AS1103, AS1104 ILED vs. ISET 90 45 80 40 70 35 60 30 e ) A 50 e 25 m ) (D 40 mA 20 ILE 30 (D 15 E 20 IL 10 10 5 0 0 0 20 40 60 80 100 120 140 160 0 20 40 60 80 100 120 140 160 ISET (µA) ISET (µA) www.austriamicrosystems.com Revision 1.5 7 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Typical Performance Characteristics Figure 15. AS1101 vs. RSET Figure 16. AS1102, AS1103, AS1104 ILED vs. VIN 60 60 50 AS11011 50 LED Type 1 LED Type 2 40 40 e A) e 30 mA) 30 m RSET ( I (LED 20 I LED 20 10 10 0 0 3.0 3.5 4.0 4.5 5.0 3.0 3.5 4.0 4.5 5.0 V (V) V (V) IN IN Figure 17. Control Voltage Transient Response Figure 18. Enable Voltage Transient Response LED Current 10mA/Div LED Current 10mA/Div RL Voltage 2V/Div ble Voltage 2V/Div T a C En 1µs/Div 1µs/Div www.austriamicrosystems.com Revision 1.5 8 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Application Information 8 Application Information Figure 19. Typical Application Diagrams 2 Diode Control with Enable 3 Diode Control with Enable VIN VIN I1/I2 VSAT I3/I4 I1 VSAT I2 I3 ISET ISET VSET VSET (3V) RSET CTRL AS1101 (3V) RSET CTRL AS1102 ENABLE ENABLE ON ON GND GND 4 Diode Control 4 Diode Control with Enable VIN VIN I1 VSAT I2 I3 I4 I1 VSAT I2 I3 I4 ISET ISET VSET VSET AS1103 (3V) RSET CTRL AS1104 (3V) RSET CTRL ENABLE ON GND GND Setting the LED Current The current going into the LEDs is approximately OCMR times greater then the current ISET. LED current is controlled by VSET and RSET (see Figure19) according to the formula: ILED = OCMR x (VSET - VCTRL)/RSET (EQ 1) For VSET = 3V and a specific LED current, the value of RSET can be determined using the graphs shown in Figure9, Figure10, and Figure11 on page 7. For any other option, the value of ISET can be determined using the graph in Figure3 on page6. Note: LED brightness can also be adjusted by driving pin ENABLE or pin CTRL with a PWM signal. www.austriamicrosystems.com Revision 1.5 9 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Package Drawings and Markings 9 Package Drawings and Markings Figure 20. SC70-6 Package Notes: 1. All dimensions are in millimeters. 2. Dimensions are inclusive of plating. 3. Dimensions are exclusive of mold flash and metal burrs. 4. All specifications comply with JEITA SC88 and JEDEC-MO-203. Symbol Min Max e 0.65 BSC D 1.80 2.20 b 0.15 0.30 E 1.15 1.35 HE 1.80 2.40 Q1 0.10 0.40 A2 0.80 1.00 A1 0.00 0.10 A 0.80 1.10 c 0.10 0.18 L 0.10 0.30 Lj 0.26 0.46 www.austriamicrosystems.com Revision 1.5 10 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Package Drawings and Markings Figure 21. MSOP-8 Package Symbol Millimeters ± Tolerance Symbol Millimeters ± Tolerance A 1.10 Max b 0.33 +0.07 to -0.08 A1 0.10 ±0.05 b1 0.30 ±0.05 A2 0.86 ±0.08 c 0.18 ±0.05 D 3.00 ±0.10 c1 0.15 +0.03 to -0.02 D2 2.95 ±0.10 θ1 3.0º ±3.0º E 4.90 ±0.15 θ2 12.0º ±3.0º E1 3.00 ±0.10 θ3 12.0º ±3.0º E2 2.95 ±0.10 L 0.55 ±0.15 E3 0.51 ±0.13 L1 0.95 BSC E4 0.51 ±0.13 aaa 0.10 R 0.15 +0.15 to -0.08 bbb 0.08 R1 0.15 +0.15 to -0.08 ccc 0.25 t1 0.31 ±0.08 e .65 BSC t2 0.41 ±0.08 S .525 BSC Notes: 1. All dimensions are in millimeters (angle in degrees), unless otherwise specified. 2. Datums B and C to be determined at datum plane H. 3. Dimensions D and E1 are to be determined at datum plane H. 4. Dimensions D2 and E2 are for top package and D and E1 are for bottom package. 5. Cross section A-A to be determined at 0.13 to 0.25mm from the lead tip. 6. Dimensions D and D2 do not include mold flash, protrusion, or gate burrs. 7. Dimension E1 and E2 do not include interlead flash or protrusion. www.austriamicrosystems.com Revision 1.5 11 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet - Ordering Information 10 Ordering Information Part Number Marking Description Package Type Delivery Form AS1101-T JO1 Dual LED driver with enable. AS1102-T JO2 Triple LED driver with enable. SC70-6 Tape and Reel AS1103-T JO3 Quad LED driver. AS1104-T Tape and Reel JO4 Quad LED driver with enable. MSOP-8 AS1104 Tubes www.austriamicrosystems.com Revision 1.5 12 - 13

AS1101/AS1102/AS1103/AS1104 Data Sheet Copyrights Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans- lated, 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. austriami- crosystems 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 life- sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystemsAG 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 tech- nical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystemsAG 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 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact www.austriamicrosystems.com Revision 1.5 13 - 13