A S 11 0 1 , A S 11 0 2 , A S 11 0 3 , A S 11 0 4 D a ta S he e t Low-Dropout LED Drivers 1 General Description 2 Key Features The AS1101/AS1102/AS1103/AS1104 are LED drivers designed to match current source bias for any color LED, including white and blue. The devices can drive up to 4 high-current LEDs, and the LED current is programmable using an external resistor (RSET). The AS1101 LED currents are 460 x ISET (per LED, typ) at an LED cathode voltage (VSAT) of 150mV and 650 x ISET (typ) at a VSAT of 1V, where ISET is the current through RSET connected to pin CTRL. The AS1102, AS1103, and AS1104 LED currents are 230 x ISET (per LED, typ) at a VSAT of 150mV and 325 x ISET (typ) at a VSAT of 1V. The AS1101, AS1102, and AS1104 incorporate a chipenable feature via pin ON. When the devices are disabled, the supply current drops to less than 1µA. The AS1101, AS1102, and AS1103 are available in a 6-pin SC70 package; the AS1104 is available in a 8-pin MSOP package. ! LED Drivers for Parallel-Connected LEDs ! Ultra-Low Voltage Drop: Less Than 150mV (for Liion Battery Support) ! Analog and PWM Brightness Control ! Up to 80mA per LED (AS1101) ! Up to 40mA per LED (AS1102, AS1103, AS1104) ! No Electromagnetic Interference, No SwitchingNoise ! Current-Matching Requires No External Components ! Active-Low Shutdown Mode (AS1101, AS1102, and AS1103) ! Low Shutdown-Current: Less Than 1µA ! SC70-6 Package (AS1101, AS1102, and AS1103) ! MSOP-8 Package (AS1104) 3 Applications Figure 1. Typical Application Diagrams The AS110x devices are ideal for LED displays and keyboard backlights, as well as lighting management units for battery powered audio devices such as MP3 and CD players, mobile and cordless phones, PDAs, portable DVD players, and consumer electronics. 3 Diode Control with Enable 2 Diode Control with Enable VIN VIN I1/I2 VSAT I3/I4 I1 VSAT ISET VSET (3V) I2 I3 ISET RSET CTRL VSET (3V) AS1101 ENABLE RSET CTRL AS1102 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 (3V) RSET CTRL AS1103 VSET (3V) RSET CTRL AS1104 ENABLE ON GND www.austriamicrosystems.com GND Revision 1.5 1 - 13 AS1101/AS1102/AS1103/AS1104 Data Sheet - P i n o u t 4 Pinout Pin Assignments Figure 2. Pin Assignments – (Top View) CTRL 1 I1/I2 2 N/C 3 AS1101 6 ON 5 4 CTRL 1 I3/I4 I2 2 GND I1 3 AS1102 6 ON CTRL 1 5 I3 I2 2 4 GND I1 3 AS1103 6 I3 5 I4 4 GND 6-Pin SC70 ON 1 I3 2 8 N/C 7 CTRL AS1104 I4 3 6 I2 GND 4 5 I1 8-Pin MSOP Pin Descriptions Table 1. Pin Descriptions Pin Number Pin Name CTRL (see Figure 2) Description Sets LED current; connect to external resistor. I1 Connect to cathode of LED. I2 Connect to cathode of LED. I3 Connect to cathode of LED. I4 Connect to cathode of LED. GND ON www.austriamicrosystems.com Ground Device Enable Input. Revision 1.5 2 - 13 AS1101/AS1102/AS1103/AS1104 Data Sheet - A b s o l u t e M a x i m u m R a t i n g s 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 reliability. Table 2. Absolute Maximum Ratings Parameter Min Max Unit VI1, VI2, VI3, VI4, CTRL and ON Voltage to GND -0.3 5 V 200 mW SC70-6 250 mW MSOP-8 100 mA 260 ºC 150 ºC 150 ºC Power Dissipated by Device at TAMB = 85°C I1, I2, I3, I4 Steady State Current Package Body Temperature † Junction Temperature Storage Temperature -65 Electrostatic Discharge Protection (ESD) Level 2 kV Comment Human Body Model; Norm: MIL-STD883E 3015 methods. † The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-020C “Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices”. Operating Conditions Table 3. Recommended Operating Conditions Parameter Min Typ Max Unit LED Cathode Voltage 0.15 0.6 3.6 V 2.2 3.0 3.6 V 0 0.2 0.5 V -40 25 85 ºC Enable Voltage ON Mode Enable Voltage OFF Mode Ambient Temperature † † † Comments Not applicable to AS1103. www.austriamicrosystems.com Revision 1.5 3 - 13 AS1101/AS1102/AS1103/AS1104 Data Sheet - E l e c t r i c a l C h a r a c t e r i s t i c s 6 Electrical Characteristics AS1101 Electrical Characteristics TAMB = 25°C (unless otherwise noted). Table 4. Electrical Characteristics – AS1101 Parameter Symbol Conditions Min Typ ISET Range ISET VON = 3V 25 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 ISET in OFF Mode ISET,OFF VCTRL = 3V, VSAT = 3V, VON = 0V IIN in OFF Mode IIN,OFF VCTRL = 3V, VSAT = 3V, VON = 0V, TAMB = 25ºC 150 † η † VIN = 3V, VON = 3V µA 3 % 0.1 1 µA 0.1 1 µA VCTRL = 3V, VSAT = 3V, VON = 0V Peak Efficiency Max Units 4 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 ISET Range ISET VON = 3V 25 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 Typ Max Units 150 µA 4 - 13 AS1101/AS1102/AS1103/AS1104 Data Sheet - E l e c t r i c a l C h a r a c t e r i s t i c s Table 5. Electrical Characteristics – AS1102, AS1103, AS1104 Parameter Symbol Conditions Min LED-to-LED Current Matching Match VON = 3V -3 ISET,OFF VCTRL = 3V, VSAT = 3V, VON = 0V IIN,OFF VCTRL = 3V, VSAT = 3V, VON = 0V, TAMB = 25°C ISET in OFF Mode IIN in OFF Mode 1 1 2 η VIN = 3V, VON = 3V Max Units 3 % 0.1 1 µA 0.1 1 µA VCTRL = 3V, VSAT = 3V, VON = 0V Peak Efficiency Typ 2 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 - Ty p i c a l P e r f o r m a n c e C h a r a c t e r i s t i c s 7 Typical Performance Characteristics Figure 4. Set Current vs.VSET; RSET = 30kΩ 100 100 90 90 80 80 70 70 60 60 ISET (µA) e ISET (µA) e Figure 3. Set Current vs. VCTRL 50 40 30 50 40 30 20 20 10 10 0 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 VCTRL (V) VSET (V) Figure 5. AS1101 ILED vs. VSAT Figure 6. AS1102, AS1103, AS1104 ILED vs. VSAT 35 30 30 25 ISET = 100µA 25 ILED (mA) e ILED (mA) e ISET = 50µA 20 ISET = 25µA 15 20 15 ISET = 50µA 10 10 ISET = 25µA 5 5 0.0 0.2 0.4 0.6 0.8 0.0 1.0 0.2 350 600 300 500 250 400 200 OCMR OCMR 0.8 1.0 Figure 8. AS1102, AS1103, AS1104 OMCR vs. ISET 700 300 0.6 VSAT (V) VSAT (V) Figure 7. AS1101 OMCR vs. ISET 0.4 150 200 100 100 50 0 0 0 20 40 60 80 0 100 120 140 160 40 60 80 100 120 140 160 ISET (µA) ISET (µA) www.austriamicrosystems.com 20 Revision 1.5 6 - 13 AS1101/AS1102/AS1103/AS1104 Data Sheet - Ty p i c a l P e r f o r m a n c e C h a r a c t e r i s t i c s Figure 9. AS1102, AS1103, AS1104 ILED vs. RSET, VSET = 3V Figure 10. AS1102, AS1103, AS1104 ILED vs. RSET; VSET = 3V 22 35 SAT = = 0.5V 0.5V VVSAT 20 VSAT = 1V 30 SAT = = 0.6V 0.6V VVSAT VSAT = 0.6V 25 16 ILED (mA) e ILED (mA) e 18 14 12 VVSAT SAT = = 0.4V 0.4V 10 20 15 10 8 VSAT = 0.3V SAT = = 0.3V 0.3V VVSAT 6 5 4 VSAT = 0.15V 0 0 20 40 60 80 100 120 140 160 0 20 40 60 80 100 120 140 160 180 200 RSET (kΩ) RSET (kΩ) Figure 11. AS1101 ILED vs. RSET; VSET = 3V 22 13 VSAT = 0.30V VSAT = 0.25V VSAT = 0.15V 20 Figure 12. ILED vs. Temp; VLED = -0.25V, ISET = 50µA 18 ILED (mA) e VSAT = 0.20V 14 12 VSAT = 0.10V VSAT = 0.05V 10 8 ILED (mA) e 12.5 16 12 11.5 6 4 2 11 10 20 30 40 50 60 70 80 90 100 -40 -20 RSET (kΩ) 45 80 40 70 35 60 30 50 25 30 60 80 100 20 15 20 10 10 5 0 40 Figure 14. AS1102, AS1103, AS1104 ILED vs. ISET 90 40 20 Temperature (°C) ILED (mA) e ILED (mA) e Figure 13. AS1101 ILED vs. ISET 0 0 0 20 40 60 80 100 120 140 160 0 ISET (µA) www.austriamicrosystems.com 20 40 60 80 100 120 140 160 ISET (µA) Revision 1.5 7 - 13 AS1101/AS1102/AS1103/AS1104 Data Sheet - Ty p i c a l P e r f o r m a n c e C h a r a c t e r i s t i c s Figure 15. AS1101 vs. RSET Figure 16. AS1102, AS1103, AS1104 ILED vs. VIN 60 60 50 50 AS11011 LED Type 2 30 ILED (mA) e 40 RSET 20 10 40 30 20 10 0 0 3.5 4.0 4.5 5.0 3.0 VIN (V) 4.5 5.0 2V/Div LED Current Figure 18. Enable Voltage Transient Response Enable Voltage 10mA/Div LED Current CTRL Voltage 4.0 VIN (V) Figure 17. Control Voltage Transient Response 1µs/Div www.austriamicrosystems.com 3.5 10mA/Div 3.0 2V/Div ILED (mA) e LED Type 1 1µs/Div Revision 1.5 8 - 13 AS1101/AS1102/AS1103/AS1104 Data Sheet - A p p l i c a t i o n I n f o r m a t i o n 8 Application Information Figure 19. Typical Application Diagrams 3 Diode Control with Enable 2 Diode Control with Enable VIN VIN I1/I2 VSAT I3/I4 I1 VSAT ISET VSET (3V) I2 I3 ISET RSET CTRL VSET (3V) AS1101 ENABLE RSET CTRL AS1102 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 (3V) RSET CTRL AS1103 VSET (3V) RSET CTRL AS1104 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 Figure 19) 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 Figure 9, Figure 10, and Figure 11 on page 7. For any other option, the value of ISET can be determined using the graph in Figure 3 on page 6. 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 - P a c k a g e D r a w i n g s a n d M a r k i n g s 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 e www.austriamicrosystems.com Max 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 Revision 1.5 10 - 13 AS1101/AS1102/AS1103/AS1104 Data Sheet - P a c k a g e D r a w i n g s a n d M a r k i n g s 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. 2. 3. 4. 5. 6. 7. All dimensions are in millimeters (angle in degrees), unless otherwise specified. Datums B and C to be determined at datum plane H. Dimensions D and E1 are to be determined at datum plane H. Dimensions D2 and E2 are for top package and D and E1 are for bottom package. Cross section A-A to be determined at 0.13 to 0.25mm from the lead tip. Dimensions D and D2 do not include mold flash, protrusion, or gate burrs. 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 - O r d e r i n g I n f o r m a t i o n 10 Ordering Information Part Number Marking AS1101-T JO1 Dual LED driver with enable. AS1102-T JO2 Triple LED driver with enable. AS1103-T JO3 Quad LED driver. JO4 Quad LED driver with enable. AS1104-T AS1104 www.austriamicrosystems.com Description Revision 1.5 Package Type Delivery Form SC70-6 Tape and Reel MSOP-8 Tape and Reel Tubes 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, 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. 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