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Data Sheet
A S 11 0 1 , A S 11 0 2 , A S 11 0 3 , A S 11 0 4
Low-Dropout LED Drivers
1 General Description
The AS110x family are LED drivers providing matched current source bias for any color LED, including white and blue. LED current is programmable using an external resistor. The AS1101 LED currents are typical 460 x ISET (per LED) at an LED cathode voltage of 150mV and typical 650 x ISET at an LED cathode voltage of 1V. The AS1102, AS1103, and AS1104 LED currents are typical 230 x ISET (per LED) at an LED cathode voltage of 150mV and typical 325 x ISET at an LED cathode voltage of 1V where ISET is the current through the external resistor connected to the CTRL pin. The AS110x family can drive up to 4 high-current LEDs. 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 devices are pin-to-pin compatible to the FAN5611, FAN5612 and FAN5614.
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) Pin-to-Pin Compatible to FAN5611, FAN5612, and FAN5614
The AS1101, AS1102, and AS1103 are available in a 6-pin SC70 package; the AS1104 is available in a 8-pin .com The AS110x devices are ideal for LED displays and keyMSOP package. board 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. Figure 1. Typical Application Diagrams
2 Diode Control with On/Off VIN VIN 3 Diode Control with On/Off
3 Applications
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ISET VSET(3V) RSET ENABLE ON CTRL
I1/I2
I3/I4 VSET(3V)
ISET RSET ENABLE
I3 CTRL ON
I2
I1
AS1101
GND
AS1102
GND
4 Diode Control VIN VIN
4 Diode Control with On/Off
ISET VSET(3V) RSET
I4 CTRL
I3
I2
I1 VSET(3V)
ISET RSET ENABLE
I4 CTRL ON
I3
I2
I1
AS1103
GND
AS1104
GND
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Operating Conditions
4 Absolute Maximum Ratings
Stresses beyond those listed in Table 1 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 Table 2 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 1. 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".
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4.1 Operating Conditions
Table 2. Recommended Operating Conditions .com Parameter Min Typ Max Unit LED Cathode Voltage Enable Voltage ON Mode Enable Voltage OFF Mode Ambient Temperature

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Comments
0.15 2.2 0 -40
0.6 3.0 0.2 25
3.6 3.6 0.5 85
V V V C
Not applicable to AS1103.
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Electrical Characteristics - AS1101
5 DC Electrical Characteristics
5.1 Electrical Characteristics - AS1101
Conditions: TAMB = 25C (unless otherwise noted). Table 3. 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 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 Min 25 350 315 295 435 425 415 470 460 440 -3 0.1 0.1 500 450 420 620 610 590 670 660 630 Typ Max Units 150 650 585 545 805 795 765 870 860 820 3 1 1 A 4 95 % % A A
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LED-to-LED Current Matching ISET in OFF Mode
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VCTRL = 3V, VSAT = 3V, VON = 0V
IIN in OFF Mode
IIN,OFF
VCTRL = 3V, VSAT = 3V, VON = 0V, TAMB = 25C VCTRL = 3V, VSAT = 3V, VON = 0V
Peak Efficiency
EFF
VIN = 3V, VON = 3V
Efficiency = (VIN - VSAT) / VIN. Information parameter, guaranteed by design.
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Electrical Characteristics - AS1102, AS1103, AS1104
5.2 Electrical Characteristics - AS1102, AS1103, AS1104
Conditions: TAMB = 25C (unless otherwise noted). Table 4. 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 LED-to-LED Current Matching 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 .com= 25C VCTRL = 3V, VSAT = 3V, VON = 0V Peak Efficiency
3
Min 25 175 170 145 215 215 205 235 230 220 -3
Typ
Max Units 150 A
250 240 210 310 305 295 335 330 315
325 310 275 405 395 385 435 430 410 3 % A
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ISET in OFF Mode
1
0.1 0.1
1 1
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IIN,OFF A 2 95 %
IIN in OFF Mode
2
EFF
VIN = 3V, VON = 3V
1. Not applicable to AS1103. 2. Not applicable to AS1103. 3. Efficiency = (VIN - VSAT) / VIN. Information parameter, guaranteed by design.
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6 Typical Performance Characteristics
ISET vs V CTRL 100 90 80 70 60 50 40 30 20 10 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 V CTRL (V) 100 90 80 70 60 50 40 30 20 10 0 0.0 0.5 1.0 1.5 2.0 V SET (V) 2.5 3.0 3.5 4.0 ISET vs V SET (RSET = 30k )
AS1101 35 30
ILED vs V SAT 30 25
ISET = 50A
ISET in A
ISET (A)
AS1102-AS1104
ILED vs V SAT
ISET = 100A
ILED (mA)
ILED (mA)
25 20 15 10 5 0.0 0.2 0.4 V SAT (V) 0.6
20 15 10
ISET = 25A ISET = 50A
ISET = 25A
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5 0.8
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0.8 1.0
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1.0
0.0
0.2
0.4 V SAT (V)
0.6
AS1102-AS1104 22 20 18
ILED vs RSET
AS1102-AS1104 35 30 25 ILED (mA)
ILED vs RSET
ILED ( mA)
16 14 12 10 8 6 4 0 20 40 60 80
Vsat=0.6V Vsat=0.5V Vsat=0.4V Vsat=0.3V
Vsat=1V Vsat=0.6V Vsat=0.3V Vsat=0.15V
20 15 10 5
100
120
140
160
0 0 20 40 60 80 100 120 RSET (k ) 140 160 180 200
RSET (k )
AS1101 22 20 18 16 ILED (mA) 14 12 10 8 6 4 2 10 20 30 40 50 Vsat=0.30V Vsat=0.25V Vsat=0.20V Vsat=0.15V Vsat=0.10V Vsat=0.05V
ILED vs RSET
ILED vs Te m pe rature (V LED = 0.25V, ISET = 50A) 13
12.5 ILED in mA
12 11.5
60
70
80
90
100
-40
-20
0
20
40
60
80
11 100
RSET (k )
Te m pe rature (C)
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AS1101 700 600 500 OCMR 400 300 200 100 0 0 20 40 60
OCM R vs ISET 350 300 250 OCMR 200 150 100 50 0 80 ISET (A) 100 120 140 160 0 20
AS1102 - AS1104
OCM R vs ISET
40
60
80 ISET (A)
100
120
140
160
Figure 2. Control Voltage Transient Response
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CH2: LED Current (10mA/Div) CH1: Control Voltage (2V/Div)
Figure 3. Enable Voltage Transient Response
CH2: LED Current (10mA/Div)
CH1: Enable Voltage (2V/Div)
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7 Application Information
Figure 4. Typical Application Diagrams
2 Diode Control with On/Off VIN VIN 3 Diode Control with On/Off
ISET VSET(3V) RSET ENABLE ON CTRL
I1/I2
I3/I4 VSET(3V)
ISET RSET ENABLE
I3 CTRL ON
I2
I1
AS1101
GND
AS1102
GND
4 Diode Control VIN VIN
4 Diode Control with On/Off
ISET VSET(3V) RSET
I4 CTRL
I3
I2
I1 VSET(3V)
ISET RSET ENABLE
I4 CTRL ON
I3
I2
I1
AS1103
GND
AS1104
GND
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Figure 5. Performance Characteristics
AS1101 90 80 70 60 50 40 30 20 10 0 0 20 40 60 80 ISET (A) 100 120 140 160 ILED vs ISET 45 40 35 30 25 20 15 10 5 0 0 20 40 60 80 ISET (A) 100 120 140 160
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AS1102 - AS1104 ILED vs ISET
ILED (mA)
ILED (mA)
AS1101 vs Res is tor 60 50
AS1101
AS1102 - AS1104 60 50 40 ILED (mA)
LED Type 2
ILED vs V IN
LED Type 1
ILED (mA)
40 30 20 10 0 3.0 3.5 4.0 V IN (V) 4.5 5.0
Resistor
30 20 10 0 3.0 3.5 4.0 V IN (V) 4.5 5.0
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Setting the LED Current
7.1 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 4) according to the formula: ILED = OCMR x (VSET - VCTRL) RSET (EQ 1)
For VSET = 3V and a specific LED current, the RSET value can be determined using the diagram shown in Section 6 Typical Performance Characteristics on page 5. For any other option, the value of ISET can be determined using the graph "ISET vs. VCTRL" on page 7. LED Brightness can also be adjusted by driving pin ENABLE or pin CTRL with a PWM signal.
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Pin Descriptions and Assignments
8 Pinout and Packaging
8.1 Pin Descriptions and Assignments
Table 5. Pin Descriptions Pin (See Figure 6) Name CTRL I1 I2 I3 I4 GND ON Figure 6. Pin Assignment - (Top View) Description Sets LED current; connect to external resistor. Connect to cathode of LED. Connect to cathode of LED. Connect to cathode of LED. Connect to cathode of LED. Ground Device Enable Input.
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
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N/C
3
4
GND
I1
3
4
GND
I1
3
4
GND
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6-Pin SC70 Packages
ON
1
8
N/C
I3
2
7
CTRL
AS1104
I4
3 6
I2
GND
4
5
I1
8-Pin MSOP Package
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Package Drawings and Markings
8.2 Package Drawings and Markings
Figure 7. SC70-6 Package
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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
e D b E HE Q1 A2 A1 A c L L1 1.80 0.15 1.15 1.80 0.10 0.80 0.00 0.80 0.10 0.10 0.26
Min
0.65 BSC
Max
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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Package Drawings and Markings
Figure 8. MSOP-8 Package
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Notes: 1. 2. 3. 4. 5. 6.
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All dimensions are in millimeters (angles 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; dimensions D and E1 are for bottom package. Cross section A-A to be determined at 0.18 to 0.22mm from the leadtip. Dimension D and D2 does not include mold flash, protrusions, or gate burrs.
7. Dimension E1 and E2 does not include inter-lead flash or protrusion. MSOP-8 Package Outline Symbol
A A1 A2 D D2 E E1 E2 E3 E4 R R1 t1 t2
Millimeters
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
Tolerance
Max 0.05 0.05 0.10 0.10 0.15 0.10 0.10 0.13 0.18 +0.15 to -0.08 +0.15 to -0.08 0.08 0.08
Symbol
b b1 c c1 1 2 3 L L1 aaa bbb ccc e S
Millimeters
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 .5 BSC .525 BSC
Tolerance
+0.07 to -0.08 0.05 0.05 +0.03 to -0.02 3.0 3.0 3.0 0.15 -
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9 Ordering Information
Part Number AS1101 AS1102 AS1103 AS1104 MSOP-8 SC70-6 Tape and Reel Tube Package Type Delivery Form Description Dual LED driver with enable. Triple LED driver with enable. Quad LED driver. Quad LED driver with enable.
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Copyrights
Copyright (c) 1997-2005, 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.
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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
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