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A S 11 0 1 , A S 11 0 2 , A S 11 0 3 , A S 11 0 4
Low-Dropout LED Drivers
D a ta S he e t
1 General Description
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 1A. The AS1101, AS1102, and AS1103 are available in a 6-pin SC70 package; the AS1104 is available in a 8-pin MSOP package.
2 Key Features
! !
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 1A SC70-6 Package (AS1101, AS1102, and AS1103) MSOP-8 Package (AS1104)
! ! ! !
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3 Applications
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 VIN
Figure 1. Typical Application Diagrams
2 Diode Control with Enable VIN
I1/I2 VSAT ISET VSET (3V) RSET CTRL ON GND
I3/I4 ISET VSET (3V)
I1 VSAT
I2
I3
AS1101
RSET CTRL ON
AS1102
GND
ENABLE
ENABLE
4 Diode Control VIN VIN
4 Diode Control with Enable
I1 VSAT I2 ISET VSET (3V) RSET CTRL
I3
I4 ISET VSET (3V)
I1 VSAT I2
I3
I4
AS1103
GND
RSET CTRL ON
AS1104
GND
ENABLE
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AS1101/AS1102/AS1103/AS1104 Data Sheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments - (Top View)
CTRL
1
6
ON
CTRL
1
6
ON
CTRL
1
6
I3
I1/I2 N/C
2
AS1101
5
I3/I4 GND
I2 I1
2
AS1102
5
I3 GND
I2 I1
2
AS1103
5
I4 GND
3
4
3
4
3
4
6-Pin SC70
ON
1
8
N/C
I3 I4 GND
2
7
CTRL I2 I1
AS1104
3 4 6 5
8-Pin MSOP
Pin Descriptions
Table 1. Pin Descriptions Pin Number Pin Name CTRL I1 I2 (see Figure 2) I3 I4 GND ON Connect to cathode of LED. Connect to cathode of LED. Connect to cathode of LED. Connect to cathode of LED. Ground Device Enable Input. Description Sets LED current; connect to external resistor.
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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 VI1, VI2, VI3, VI4, CTRL and ON Voltage to GND Power Dissipated by Device at TAMB = 85C I1, I2, I3, I4 Steady State Current Package Body Temperature Junction Temperature Storage Temperature Electrostatic Discharge Protection (ESD) Level

Min -0.3
Max 5 200 250 100 260 150
Unit V mW mW mA C C C kV
Comment
SC70-6 MSOP-8
-65 2
150
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 LED Cathode Voltage Enable Voltage ON Mode Enable Voltage OFF Mode Ambient Temperature

Min 0.15 2.2 0 -40
Typ 0.6 3.0 0.2 25
Max 3.6 3.6 0.5 85
Unit V V V C
Comments
Not applicable to AS1103.
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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 = 25C (unless otherwise noted). Table 4. Electrical Characteristics - AS1101 Parameter ISET Range Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio LED-to-LED Current Matching ISET in OFF Mode Symbol ISET OCMR OCMR OCMR OCMR OCMR OCMR OCMR OCMR OCMR Match ISET,OFF Conditions VON = 3V ISET = 25A, VSAT = 150mV, VON = 3V ISET = 40A, VSAT = 150mV, VON = 3V ISET = 75A, VSAT = 150mV, VON = 3V ISET = 25A, VSAT = 600mV, VON = 3V ISET = 40A, VSAT = 600mV, VON = 3V ISET = 75A, VSAT = 600mV, VON = 3V ISET = 25A, VSAT = 1000mV, VON = 3V ISET = 40A, VSAT = 1000mV, VON = 3V ISET = 75A, VSAT = 1000mV, VON = 3V VON = 3V VCTRL = 3V, VSAT = 3V, VON = 0V VCTRL = 3V, VSAT = 3V, VON = 0V, TAMB = 25C VCTRL = 3V, VSAT = 3V, VON = 0V Peak Efficiency

Min 25 350 335 295 435 425 415 470 460 440 -3
Typ
Max Units 150 A
500 480 420 620 610 590 670 660 630
650 625 545 805 795 765 870 860 820 3 % A
0.1 0.1
1 1
IIN in OFF Mode
IIN,OFF
A 4 95 %
VIN = 3V, VON = 3V
Efficiency = (VIN - VSAT)/VIN. Information parameter, guaranteed by design.
AS1102, AS1103, AS1104 Electrical Characteristics
TAMB = 25C (unless otherwise noted). Table 5. Electrical Characteristics - AS1102, AS1103, AS1104 Parameter ISET Range Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio Output Current Multiplication Ratio www.austriamicrosystems.com Symbol ISET OCMR OCMR OCMR OCMR OCMR OCMR OCMR OCMR OCMR Conditions VON = 3V ISET = 25A, VSAT = 150mV, VON = 3V ISET = 40A, VSAT = 150mV, VON = 3V ISET = 75A, VSAT = 150mV, VON = 3V ISET = 25A, VSAT = 600mV, VON = 3V ISET = 40A, VSAT = 600mV, VON = 3V ISET = 75A, VSAT = 600mV, VON = 3V ISET = 25A, VSAT = 1000mV, VON = 3V ISET = 40A, VSAT = 1000mV, VON = 3V ISET = 75A, VSAT = 1000mV, VON = 3V Revision 1.5 Min 25 175 170 145 215 215 205 235 230 220 250 240 210 310 305 295 335 330 315 Typ Max Units 150 325 310 275 405 395 385 435 430 410 4 - 13 A
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 LED-to-LED Current Matching ISET in OFF Mode
1
Symbol Match ISET,OFF
Conditions VON = 3V VCTRL = 3V, VSAT = 3V, VON = 0V VCTRL = 3V, VSAT = 3V, VON = 0V, TAMB = 25C VCTRL = 3V, VSAT = 3V, VON = 0V
Min -3
Typ
Max Units 3 % A
0.1 0.1
1 1
IIN in OFF Mode
1
IIN,OFF
A 2 95 %
Peak Efficiency
2
VIN = 3V, VON = 3V
1. Not applicable to AS1103. 2. Efficiency = (VIN - VSAT) / VIN. Information parameter, guaranteed by design.
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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 3. Set Current vs. VCTRL
100 90 80 70
Figure 4. Set Current vs.VSET; RSET = 30k
100 90 80 70
ISET (A) e
ISET (A) e
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
60 50 40 30 20 10 0
60 50 40 30 20 10 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
VCTRL (V) Figure 5. AS1101 ILED vs. VSAT
35 30
ISET = 50A
VSET (V) Figure 6. AS1102, AS1103, AS1104 ILED vs. VSAT
30
ISET = 100A
25
ILED (mA) e
ILED (mA) e
25 20 15 10 5 0.0 0.2 0.4 0.6 0.8 1.0
ISET = 25A
20
15
ISET = 50A
10
ISET = 25A
5 0.0 0.2 0.4 0.6 0.8 1.0
VSAT (V) Figure 7. AS1101 OMCR vs. ISET
700 600 500
VSAT (V) Figure 8. AS1102, AS1103, AS1104 OMCR vs. ISET
350 300 250
OCMR
300 200 100 0 0 20 40 60 80 100 120 140 160
OCMR
400
200 150 100 50 0 0 20 40 60 80 100 120 140 160
ISET (A)
ISET (A)
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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
22 20 18
VSAT = 0.5V VSAT = 0.5V VSAT = 0.6V VSAT = 0.6V
Figure 10. AS1102, AS1103, AS1104 ILED vs. RSET; VSET = 3V
35
VSAT = 1V
30
VSAT = 0.6V
ILED (mA) e
14 12 VSAT = 0.4V VSAT = 0.4V 10 8 6 4 0 20 40 60 80 100 120 140 160
VSAT = 0.3V VSAT = 0.3V
ILED (mA) e
16
25 20 15 10
VSAT = 0.3V
5 0 0
VSAT = 0.15V
20 40 60 80 100 120 140 160 180 200
RSET (k)
Figure 11. AS1101 ILED vs. RSET; VSET = 3V
22 20 18 16
VSAT = 0.15V VSAT = 0.30V VSAT = 0.25V
RSET (k)
Figure 12. ILED vs. Temp; VLED = -0.25V, ISET = 50A
13
12.5
ILED (mA) e
14 12 10 8 6 4 2 10 20 30 40 50 60 70 80 90 100
VSAT = 0.10V VSAT = 0.05V
ILED (mA) e
VSAT = 0.20V
12
11.5
11 -40 -20 0 20 40 60 80 100
RSET (k)
Figure 13. AS1101 ILED vs. ISET
90 80 70
Temperature (C)
Figure 14. AS1102, AS1103, AS1104 ILED vs. ISET
45 40 35 30
ILED (mA) e
60
40 30 20 10 0 0 20 40 60 80 100 120 140 160
ILED (mA) e
50
25 20 15 10 5 0 0 20 40 60 80 100 120 140 160
ISET (A)
ISET (A)
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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
60 50 40
AS11011
Figure 16. AS1102, AS1103, AS1104 ILED vs. VIN
60 50 40 30 20 10 0
LED Type 1 LED Type 2
ILED (mA) e
30 20 10 0 3.0 3.5 4.0
RSET
4.5
5.0
ILED (mA) e
3.0
3.5
4.0
4.5
5.0
VIN (V)
Figure 17. Control Voltage Transient Response
VIN (V)
Figure 18. Enable Voltage Transient Response
LED Current
LED Current
10mA/Div
Enable Voltage
CTRL Voltage
2V/Div
1s/Div
1s/Div
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10mA/Div
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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
2 Diode Control with Enable VIN VIN 3 Diode Control with Enable
I1/I2 VSAT ISET VSET (3V) RSET CTRL ON GND
I3/I4 ISET VSET (3V)
I1 VSAT
I2
I3
AS1101
RSET CTRL ON
AS1102
GND
ENABLE
ENABLE
4 Diode Control VIN VIN
4 Diode Control with Enable
I1 VSAT I2 ISET VSET (3V) RSET CTRL
I3
I4 ISET VSET (3V)
I1 VSAT I2
I3
I4
AS1103
GND
RSET CTRL ON
AS1104
GND
ENABLE
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.
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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 Max
e D b E HE Q1 A2 A1 A c L Lj 1.80 0.15 1.15 1.80 0.10 0.80 0.00 0.80 0.10 0.10 0.26
0.65 BSC 2.20 0.30 1.35 2.40 0.40 1.00 0.10 1.10 0.18 0.30 0.46
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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 A1 A2 D D2 E E1 E2 E3 E4 R R1 t1 t2
Notes:
1.10 0.10 0.86 3.00 2.95 4.90 3.00 2.95 0.51 0.51 0.15 0.15 0.31 0.41
Max 0.05 0.08 0.10 0.10 0.15 0.10 0.10 0.13 0.13 +0.15 to -0.08 +0.15 to -0.08 0.08 0.08
b b1 c c1
1 2 3
0.33 0.30 0.18 0.15 3.0 12.0 12.0 0.55 0.95 BSC 0.10 0.08 0.25 .65 BSC .525 BSC
+0.07 to -0.08 0.05 0.05 +0.03 to -0.02 3.0 3.0 3.0 0.15
L L1 aaa bbb ccc e S
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.
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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 Description Package Type Delivery Form
AS1101-T AS1102-T AS1103-T AS1104-T AS1104
JO1 JO2 JO3 JO4
Dual LED driver with enable. Triple LED driver with enable. Quad LED driver. Quad LED driver with enable. MSOP-8 Tape and Reel Tubes SC70-6 Tape and Reel
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AS1101/AS1102/AS1103/AS1104 Data Sheet
Copyrights
Copyright (c) 1997-2007, 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. 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, 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
For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact
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