AS1101, AS1102, AS1103, AS1104 Low-Dropout LED Drivers

Transcription

1 AS11, AS12, AS13, AS14 Low-Dropout LED Drivers Data Sheet 1 General Description The AS11/AS12/AS13/AS14 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 (). The AS11 LED currents are 46 x (per LED, typ) at an LED cathode voltage (VSAT) of 1mV and 6 x (typ) at a VSAT of 1V, where is the current through connected to pin. The AS12, AS13, and AS14 LED currents are 2 x (per LED, typ) at a VSAT of 1mV and 32 x (typ) at a VSAT of 1V. The AS11, AS12, and AS14 incorporate a chipenable feature via pin. When the devices are disabled, the supply current drops to less than 1µA. The AS11, AS12, and AS13 are available in a 6-pin SC7 package; the AS14 is available in a 8-pin MSOP package. 2 Key Features! LED Drivers for Parallel-Connected LEDs! Ultra-Low Voltage Drop: Less Than 1mV (for Liion Battery Support)! Analog and PWM Brightness Control! Up to 8mA per LED (AS11)! Up to 4mA per LED (AS12, AS13, AS14)! No Electromagnetic Interference, No Switching- Noise! Current-Matching Requires No External Components! Active-Low Shutdown Mode (AS11, AS12, and AS13)! Low Shutdown-Current: Less Than 1µA! SC7-6 Package (AS11, AS12, and AS13)! MSOP-8 Package (AS14) 3 Applications Figure 1. Typical Application Diagrams The AS1x 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. 2 Diode Control with Enable 3 Diode Control with Enable I1/I2 VSAT I3/I4 I1 VSAT I2 I3 AS11 AS12 ENABLE ENABLE 4 Diode Control 4 Diode Control with Enable I1 VSAT I2 I3 I4 I1 VSAT I2 I3 I4 AS13 ENABLE AS14 Revision

2 Data Sheet - Pinout 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View) I3 I1/I2 2 AS11 I3/I4 I2 2 AS12 I3 I2 2 AS13 I4 N/C 3 4 I1 3 4 I Pin SC7 1 8 N/C I3 2 AS14 7 I4 3 6 I2 4 I1 8-Pin MSOP Pin Descriptions Table 1. Pin Descriptions Pin Number Pin Name Description 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. Ground Device Enable Input. Revision

3 Data Sheet - Absolute Maximum Ratings 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 Comment VI1, VI2, VI3, VI4, and Voltage to -.3 V mw SC7-6 Power Dissipated by Device at TAMB = 8 C 2 mw MSOP-8 I1, I2, I3, I4 Steady State Current ma Package Body Temperature 26 ºC Junction Temperature 1 ºC Storage Temperature -6 1 ºC Electrostatic Discharge Protection (ESD) Level 2 kv Human Body Model; Norm: MIL-STD883E 1 methods. The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-C Moisture/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 V Enable Voltage Mode V Enable Voltage OFF Mode.2. V Ambient Temperature ºC Not applicable to AS13. Revision

4 Data Sheet - Electrical Characteristics 6 Electrical Characteristics AS11 Electrical Characteristics TAMB = 2 C (unless otherwise noted). Table 4. Electrical Characteristics AS11 Parameter Symbol Conditions Min Typ Max Units Range V = 3V 2 1 µa Output Current Multiplication Ratio OCMR = 2µA, VSAT = 1mV, V = 3V 3 6 Output Current Multiplication Ratio OCMR = 4µA, VSAT = 1mV, V = 3V Output Current Multiplication Ratio OCMR = 7µA, VSAT = 1mV, V = 3V Output Current Multiplication Ratio OCMR = 2µA, VSAT = 6mV, V = 3V Output Current Multiplication Ratio OCMR = 4µA, VSAT = 6mV, V = 3V Output Current Multiplication Ratio OCMR = 7µA, VSAT = 6mV, V = 3V Output Current Multiplication Ratio OCMR = 2µA, VSAT = mv, V = 3V Output Current Multiplication Ratio OCMR = 4µA, VSAT = mv, V = 3V Output Current Multiplication Ratio OCMR = 7µA, VSAT = mv, V = 3V LED-to-LED Current Matching Match V = 3V -3 3 % in OFF Mode,OFF V = 3V, VSAT = 3V, V = V.1 1 µa IIN in OFF Mode IIN,OFF V = 3V, VSAT = 3V, V = V, TAMB = 2ºC.1 1 V = 3V, VSAT = 3V, V = V 4 µa Peak Efficiency η = 3V, V = 3V 9 % Efficiency = ( - VSAT)/. Information parameter, guaranteed by design. AS12, AS13, AS14 Electrical Characteristics TAMB = 2 C (unless otherwise noted). Table. Electrical Characteristics AS12, AS13, AS14 Parameter Symbol Conditions Min Typ Max Units Range V = 3V 2 1 µa Output Current Multiplication Ratio OCMR = 2µA, VSAT = 1mV, V = 3V Output Current Multiplication Ratio OCMR = 4µA, VSAT = 1mV, V = 3V Output Current Multiplication Ratio OCMR = 7µA, VSAT = 1mV, V = 3V Output Current Multiplication Ratio OCMR = 2µA, VSAT = 6mV, V = 3V Output Current Multiplication Ratio OCMR = 4µA, VSAT = 6mV, V = 3V Output Current Multiplication Ratio OCMR = 7µA, VSAT = 6mV, V = 3V Output Current Multiplication Ratio OCMR = 2µA, VSAT = mv, V = 3V Output Current Multiplication Ratio OCMR = 4µA, VSAT = mv, V = 3V Output Current Multiplication Ratio OCMR = 7µA, VSAT = mv, V = 3V Revision

5 Data Sheet - Electrical Characteristics Table. Electrical Characteristics AS12, AS13, AS14 Parameter Symbol Conditions Min Typ Max Units LED-to-LED Current Matching Match V = 3V -3 3 % in OFF Mode 1,OFF V = 3V, VSAT = 3V, V = V.1 1 µa IIN in OFF Mode 1 IIN,OFF V = 3V, VSAT = 3V, V = V, TAMB = 2 C.1 1 V = 3V, VSAT = 3V, V = V 2 µa Peak Efficiency 2 η = 3V, V = 3V 9 % 1. Not applicable to AS Efficiency = ( - VSAT) /. Information parameter, guaranteed by design. Revision

6 Data Sheet - Typical Performance Characteristics 7 Typical Performance Characteristics Figure 3. Set Current vs. V Figure 4. Set Current vs.; = kω (µa) e V (V) (µa) e V SET (V) Figure. AS11 ILED vs. VSAT 3 Figure 6. AS12, AS13, AS14 ILED vs. VSAT = µa 2 = µa 2 1 = 2µA 1 = µa V SAT (V) = 2µA V SAT (V) Figure 7. AS11 OMCR vs. 7 6 Figure 8. AS12, AS13, AS14 OMCR vs. 3 2 OCMR 4 OCMR I SET (µa) I SET (µa) Revision

7 Data Sheet - Typical Performance Characteristics Figure 9. AS12, AS13, AS14 ILED vs., = 3V Figure. AS12, AS13, AS14 ILED vs. ; = 3V VSAT =.V VSAT =.6V VSAT =.4V VSAT =.3V R SET (kω) VSAT = 1V VSAT =.6V VSAT =.3V VSAT =.1V R SET (kω) Figure 11. AS11 ILED vs. ; = 3V Figure 12. ILED vs. Temp; VLED = -.2V, = µa VSAT =.1V VSAT =.V R SET (kω) Figure 13. AS11 ILED vs. VSAT =.V VSAT =.2V VSAT =.V VSAT =.V Temperature ( C) Figure 14. AS12, AS13, AS14 ILED vs I SET (µa) I SET (µa) Revision

8 Data Sheet - Typical Performance Characteristics Figure 1. AS11 vs. 6 Figure 16. AS12, AS13, AS14 ILED vs. 6 AS111 LED Type LED Type V IN (V) Figure 17. Control Voltage Transient Response V IN (V) Figure 18. Enable Voltage Transient Response Voltage LED Current 2V/Div ma/div Enable Voltage LED Current 2V/Div ma/div 1µs/Div 1µs/Div Revision

9 Data Sheet - Application Information 8 Application Information Figure 19. Typical Application Diagrams 2 Diode Control with Enable 3 Diode Control with Enable I1/I2 VSAT I3/I4 I1 VSAT I2 I3 AS11 AS12 ENABLE ENABLE 4 Diode Control 4 Diode Control with Enable I1 VSAT I2 I3 I4 I1 VSAT I2 I3 I4 AS13 ENABLE AS14 Setting the LED Current The current going into the LEDs is approximately OCMR times greater then the current. LED current is controlled by and (see Figure 19) according to the formula: ILED = OCMR x ( - V)/ (EQ 1) For = 3V and a specific LED current, the value of can be determined using the graphs shown in Figure 9, Figure, and Figure 11 on page 7. For any other option, the value of 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 with a PWM signal. Revision

10 Data Sheet - Package Drawings and Markings 9 Package Drawings and Markings Figure. SC7-6 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-3. Symbol Min Max e.6 BSC D b.1. E HE Q1..4 A A1.. A.8 1. c..18 L.. Lj Revision

11 Data Sheet - Package Drawings and Markings Figure 21. MSOP-8 Package Symbol Millimeters ± Tolerance Symbol Millimeters ± Tolerance A 1. Max b to -.8 A1. ±. b1. ±. A2.86 ±.8 c.18 ±. D 3. ±. c to -.2 D2 2.9 ±. θ1 3.º ±3.º E 4.9 ±.1 θ2 12.º ±3.º E1 3. ±. θ3 12.º ±3.º E2 2.9 ±. L. ±.1 E3.1 ±.13 L1.9 BSC E4.1 ±.13 aaa. R to -.8 bbb.8 R to -.8 ccc.2 t1.31 ±.8 e.6 BSC t2.41 ±.8 S.2 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.. Cross section A-A to be determined at.13 to.2mm 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. Revision

12 Data Sheet - Ordering Information Ordering Information Part Number Marking Description Package Type Delivery Form AS11-T JO1 Dual LED driver with enable. AS12-T JO2 Triple LED driver with enable. SC7-6 Tape and Reel AS13-T JO3 Quad LED driver. AS14-T Tape and Reel JO4 Quad LED driver with enable. MSOP-8 AS14 Tubes Revision

13 Data Sheet Copyrights Copyright , 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. 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. For shipments of less than 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, 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 () 3136 Fax: +43 () For Sales Offices, Distributors and Representatives, please visit: Revision