AS1101, AS1102, AS1103, AS1104
Low-Dropout LED Drivers
austria
micro
systems
Data Sheet
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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 exter-
nal 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 AS11 04 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 volt-
age 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 AS11 04 incorporate a chip-
enable feature via pin ON. When the devices are dis-
abled, the supply current drops to less than 1µA.
The devices are pin-to-pin compatible to the FAN5611,
FAN5612 and FA N5614.
The AS1101, AS1102, and AS11 03 are available in a
6-pin SC70 package; the AS1104 is available in a 8-pin
MSOP package.
Figure 1. Typical Application Diagrams
2 Key Features
! LED Drivers for Parallel-Connected LEDs
! Ultra-Low Voltage Drop: Less Than 150mV (for Li-
ion Battery Support)
! Analog and PWM Brightness Control
! Up to 80mA per LED (AS1101)
! Up to 40mA per LED (AS1102, AS1103, AS1104)
! No Electromagne tic Interference, No Switching-
Noise
! Current-Matching Requires No External Compo-
nents
! 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)
! Pin-to-Pin Compatible to FAN5611, FAN5612, and
FAN5614
3 Applications
The AS110x devices are ideal for LED displays and key-
board backlights, as well as lighting management un its
for battery powered audio devices such as MP3 and CD
players, mobile and cordless phones, PDAs, portable
DVD players, and consumer electronics.
CTRL
GND
AS1104
ISET
4 Diode Control with On/Off
I2 I1I3I4
VIN
VSET(3V) RSET
CTRL
GND
AS1102
ISET
3 Diode Control with On/Off
I2 I1I3
VIN
RSET
ON
ENABLE
CTRL
GND
AS1103
ISET
4 Diode Control
I2 I1I3I4
VIN
RSET ON
ENABLE
CTRL
GND
AS1101
ISET
2 Diode Control with On/Off
I1/I2 I3/I4
VIN
RSET
ON
ENABLE
VSET(3V)
VSET(3V)
VSET(3V)
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Data Sheet Operating Conditions
4 Absolute Maximum Ratings
Stresses beyond thos e li st ed in Ta b l e 1 ma y cau se pe rmanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any othe r conditions beyond those listed in Table 2 is not implied.
Exposure to absolute maximum rating conditions for extended period s may affect device reliability.
† The reflow peak soldering temperature (bod y temperature) is specified according to IPC/JEDEC J-STD-020C “Mois-
ture/Reflow Sensitivity Classification for Non-Hermetic Solid Sta te Surface Mount Devices”.
4.1 Operating Conditions
† Not applicable to AS1103.
Table 1. Absolute Maximum Ratings
Parameter Min Max Unit Comment
VI1, VI2, VI3, VI4, CTRL and ON Voltage to GND -0.3 5 V
Power Dissipated by Device at TAMB = 85°C 200 mW SC70-6
250 mW MSOP-8
I1, I2, I3, I4 Steady State Current 100 mA
Package Body Temperature † 260 °C
Junction Temperature 150 °C
Storage Temperature -65 150 °C
Electrostatic Discharge Protection (ESD) Level 2 kV Human Body Model;
Norm: MIL-STD883E 3015 methods.
Table 2. Recommended Operatin g 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 † 00.20.5V
Ambient Temperature -40 25 85 °C
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Data Sheet Electrical Characteristics – AS1101
5 DC Electrical Characteristics
5.1 Electrical Characteristics – AS1101
Conditions: TAMB = 25°C (unless otherwise noted).
† Efficiency = (VIN - VSAT) / VIN. Information parameter, guaranteed by desi gn.
Table 3. Electrical Characte ristics – 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, V ON = 3V 350 500 650
Output Current Multiplication Ratio OCMR I SET = 40µA, VSAT = 150mV, VON = 3V 315 450 585
Output Current Multiplication Ratio OCMR I SET = 75µA, VSAT = 150mV, VON = 3V 295 420 545
Output Current Multiplication Ratio OCMR I SET = 25µA, VSAT = 600mV, VON = 3V 435 620 805
Output Current Multiplication Ratio OCMR I SET = 40µA, VSAT = 600mV, VON = 3V 425 610 795
Output Current Multiplication Ratio OCMR I SET = 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
IIN in OFF Mode IIN,OFF
VCTRL = 3V, VSAT = 3V, VON = 0V,
TAMB = 25°C 0.1 1 µA
VCTRL = 3V, VSAT = 3V, VON = 0V 4
Peak Efficiency †EFF VIN = 3V, VON = 3V 95 %
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Data Sheet Electrical Characteristics – AS1102, AS1103, AS1104
5.2 Electrical Characteristics – AS1102, AS1103, AS1104
Conditions: TAMB = 25°C (unless otherwise noted).
Table 4. Electrical Characte ristics – 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 I SET = 40µA, VSAT = 150mV, VON = 3V 170 240 310
Output Current Multiplication Ratio OCMR I SET = 75µA, VSAT = 150mV, VON = 3V 145 210 275
Output Current Multiplication Ratio OCMR I SET = 25µA, VSAT = 600mV, VON = 3V 215 310 405
Output Current Multiplication Ratio OCMR I SET = 40µA, VSAT = 600mV, VON = 3V 215 305 395
Output Current Multiplication Ratio OCMR I SET = 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
LED-to-LED Current Matching Match VON = 3V -3 3 %
ISET in OFF Mode 1
1. Not applicable to AS1103.
ISET,OFF VCTRL = 3V, V SAT = 3V, VON = 0V 0.1 1 µA
IIN in OFF Mode 2
2. Not applicable to AS1103.
IIN,OFF
VCTRL = 3V, VSAT = 3V, VON = 0V,
TAMB = 25°C 0.1 1 µA
VCTRL = 3V, VSAT = 3V, VON = 0V 2
Peak Efficiency 3
3. Efficiency = (VIN - VSAT) / VIN. Information parameter, guaranteed by design.
EFF VIN = 3V, VON = 3V 95 %
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Data Sheet
6 Typical Performance Characteristics
ISET
vs V CTRL
0
10
20
30
40
50
60
70
80
90
100
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)
ISET (µA)
AS1102-AS1104 ILED vs VSAT
5
10
15
20
25
30
0.0 0.2 0.4 0.6 0.8 1.0
VSAT
(V)
ILED (mA)
ISET = 100µA
ISET = 50µA
ISET = 25µA
AS1101 ILED vs VSAT
5
10
15
20
25
30
35
0.00.20.40.60.81.0
VSAT
(V)
ILED (mA)
ISET = 50µA
ISET = 25µA
AS1102-A S1104 ILED vs RSET
4
6
8
10
12
14
16
18
20
22
0 20 40 60 80 100 120 140 160
RSET
(kΩ)
ILED ( mA)
Vsat=0.6V
Vsat=0.5V
Vsat=0.4V
Vsat=0.3V
AS1102-A S1104 ILED vs RSET
0
5
10
15
20
25
30
35
0 20 40 60 80 100 120 140 160 180 200
RSET
(kΩ)
ILED (mA)
Vsat=1V
Vsat=0.6V
Vsat=0.3V
Vsat=0.15V
AS1101 ILED vs RSET
2
4
6
8
10
12
14
16
18
20
22
10 20 30 40 50 60 70 80 90 100
RSET
(kΩ)
ILED (mA)
Vsat=0.30V
Vsat=0.25V
Vsat=0.20V
Vsat=0.15V
Vsat=0.10V
Vsat=0.05V
ILED vs Temperature (VLED = 0 .25V, ISET = 50µA)
11
11.5
12
12.5
13
-40 -20 0 20 40 60 80 100
Temperature (°C)
ILED in mA
ISET
vs VSET
( RSET
= 30kΩ)
0
10
20
30
40
50
60
70
80
90
100
0.00.51.01.52.02.53.03.54.0
VSET
(V)
ISET in µA
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Data Sheet
Figure 2. Control Voltage Tr ansient Response
Figure 3. Enable Voltage Tra nsient Response
AS1101 OCMR vs ISET
0
100
200
300
400
500
600
700
0 20 40 60 80 100 120 140 160
ISET
(µA)
OCMR
AS1102 - AS1104 OCMR vs ISET
0
50
100
150
200
250
300
350
0 20 40 60 80 100 120 140 160
ISET
(µA)
OCMR
CH1: Control Voltage (2V/Div)
CH2: LED Current (10mA/Div)
CH1: Enable Voltage (2V/Div)
CH2: LED Current (10mA/Div)
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Data Sheet
7 Application Information
Figure 4. Typical Application Diagrams
Figure 5. Performance Characteristics
CTRL
GND
AS1104
ISET
4 Diode Control with On/Off
I2 I1I3I4
VIN
VSET(3V) RSET
CTRL
GND
AS1102
ISET
3 Diode Control with On/Off
I2 I1I3
VIN
RSET
ON
ENABLE
CTRL
GND
AS1103
ISET
4 Diode Control
I2 I1I3I4
VIN
RSET ON
ENABLE
CTRL
GND
AS1101
ISET
2 Diode Control with On/Off
I1/I2 I3/I4
VIN
RSET
ON
ENABLE
VSET(3V)
VSET(3V)
VSET(3V)
AS1101 ILED vs ISET
0
10
20
30
40
50
60
70
80
90
0 20 40 60 80 100 120 140 160
ISET
(µA)
ILED (mA)
AS1102 - A S1104 ILED vs ISET
0
5
10
15
20
25
30
35
40
45
0 20 40 60 80 100 120 140 160
ISET
(µA)
ILED (mA)
AS1101 vs Resistor
0
10
20
30
40
50
60
3.0 3.5 4.0 4.5 5.0
VIN (V)
ILED (mA)
AS1101
Resistor
AS1102 - A S1104 ILED vs VIN
0
10
20
30
40
50
60
3.0 3.5 4.0 4.5 5.0
VIN (V)
ILED (mA)
LED Type 1
LED Type 2
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Data Sheet Setting the LED Current
7.1 Setting the LED Current
The current going into the LEDs is approximately OCMR times grea ter then the current ISET. LED current is controlled
by VSET and RSET (see Figure 4) according to the formula:
For VSET = 3V and a specific LED current, the RSET value can be determined using the diagram shown in Section 6
Typical Performance Characte ristics 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.
ILED = OCMR x (VSET - VCTRL)
RSET (EQ 1)
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Data Sheet Pin Descriptions and Assignments
8 Pinout and Packaging
8.1 Pin Descriptions and Assignments
Figure 6. Pin Assignment – (Top View)
Table 5. Pin Descriptio ns
Pin (See
Figure 6) Name Description
CTRL 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 Ground
ON Device Enable Input.
CTRL
I2
I1
I3
I4
GND
1
2
3
8
7
6
ON
I3
I4
N/C
CTRL
I2
AS1104
CTRL
I2
I1
ON
I3
GND
1
2
3
6
5
4
CTRL
I1/I2
N/C
ON
I3/I4
GND
AS1101
5I1
4
GND
8-Pin MSOP Package
6-Pin SC70 Packages
1
2
3
6
5
4
AS1102
1
2
3
6
5
4
AS1103
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Data Sheet Package Drawings and Markings
8.2 Package Drawings and Markings
Figure 7. 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
e0.65 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
L1 0.26 0.46
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Data Sheet Package Drawings and Markings
Figure 8. MSOP-8 Pack ag e
Notes:
1. All dimensions are in millimeters (angles 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; dimensions D and E1 are for bottom package.
5. Cross section A-A to be determi n e d at 0.18 to 0.22mm from the leadtip.
6. 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 Millimeters ± Toler an ce 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 ±0.05 c 0.18 ±0.05
D 3.00 ±0.10 c1 0.15 +0.03 to -0.02
D2 2.95 ±0.10 θ1 3.0 ±3.0
E 4.90 ±0.15 θ212.0 ±3.0
E1 3.00 ±0.10 θ312.0 ±3.0
E2 2.95 ±0.10 L 0.55 ±0.15
E3 0.51 ±0.13 L1 0.95 BSC -
E4 0.51 ±0.18 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 .5 BSC
t2 0.41 ±0.08 S .525 BSC
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Data Sheet
9 Ordering Information
Part Number Package Type Delivery Form Description
AS1101 SC70-6 Tape and Reel
Tube
Dual LED driver with enable.
AS1102 Triple LED driver with enable.
AS1103 Quad LED driver.
AS1104 MSOP-8 Quad LED driver with enable.
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Data Sheet
Copyrights
Copyright © 1997-2005, 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 rega rd i ng th e fre e do m of the described devices from patent infringement. austriami-
crosystems AG reserves the right to change specifications and prices at any time and withou t 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. Applicati ons 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.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liab le to recipient or any third party for any damages, including but no t 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
austriamicrosystems AG rendering of technical or other services.
Cont act 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
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