AS1101, AS1102, AS1103, AS1104
Low-Dropout LED Drivers
austria
micro
systems
D a ta S h e e t
www.austriamicrosystems.com
Revision 1.3
1 - 13
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 I
SET
(per
LED) at an LED cathode voltage of 150mV and typical
650 x I
SET
at an LED cathode voltage of 1V.
The AS1102, AS1103, and AS1104 LED currents are
typical 230 x I
SET
(per LED) at an LED cathode voltage
of 150mV and typical 325 x I
SET
at an LED cathode volt-
age of 1V where I
SET
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 chip-
enable feature via pin ON. When the devices are dis-
abled, the supply current drops to less than 1A.
The devices are pin-to-pin compatible to the 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
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 Electromagnetic Interference, No Switching-
Noise
!
Current-Matching Requires No External Compo-
nents
!
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
3 Applications
The AS110x devices are ideal for LED displays and key-
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.
CTRL
GND
AS1104
I
SET
4 Diode Control with On/Off
I2
I1
I3
I4
V
IN
V
SET
(3V)
R
SET
CTRL
GND
AS1102
I
SET
3 Diode Control with On/Off
I2
I1
I3
V
IN
R
SET
ON
ENABLE
CTRL
GND
AS1103
I
SET
4 Diode Control
I2
I1
I3
I4
V
IN
R
SET
ON
ENABLE
CTRL
GND
AS1101
I
SET
2 Diode Control with On/Off
I1/I2
I3/I4
V
IN
R
SET
ON
ENABLE
V
SET
(3V)
V
SET
(3V)
V
SET
(3V)
www.austriamicrosystems.com
Revision 1.3
2 - 13
AS1101, AS1102, AS1103, AS1104
austria
micro
systems
Data Sheet
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.
The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-020C "Mois-
ture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices".
4.1 Operating Conditions
Not applicable to AS1103.
Table 1. Absolute Maximum Ratings
Parameter
Min
Max
Unit
Comment
V
I1
, V
I2
, V
I3
, V
I4
, CTRL and ON Voltage to GND
-0.3
5
V
Power Dissipated by Device at T
AMB
= 85C
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 Operating 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
0
0.2
0.5
V
Ambient Temperature
-40
25
85
C
www.austriamicrosystems.com
Revision 1.3
3 - 13
AS1101, AS1102, AS1103, AS1104
austria
micro
systems
Data Sheet
Electrical Characteristics AS1101
5 DC Electrical Characteristics
5.1 Electrical Characteristics AS1101
Conditions: T
AMB
= 25C (unless otherwise noted).
Efficiency = (V
IN
- V
SAT
) / V
IN
. Information parameter, guaranteed by design.
Table 3. Electrical Characteristics AS1101
Parameter
Symbol
Conditions
Min
Typ Max Units
I
SET
Range
I
SET
VON = 3V
25
150
A
Output Current Multiplication Ratio
OCMR
I
SET
= 25A, V
SAT
= 150mV, V
ON
= 3V
350
500
650
Output Current Multiplication Ratio
OCMR
I
SET
= 40A, V
SAT
= 150mV, V
ON
= 3V
3
15 450 585
Output Current Multiplication Ratio
OCMR
I
SET
= 75A, V
SAT
= 150mV, V
ON
= 3V
295
420
545
Output Current Multiplication Ratio
OCMR
I
SET
= 25A, V
SAT
= 600mV, V
ON
= 3V
435
620
805
Output Current Multiplication Ratio
OCMR
I
SET
= 40A, V
SAT
= 600mV, V
ON
= 3V
425
610
795
Output Current Multiplication Ratio
OCMR
I
SET
= 75A, V
SAT
= 600mV, V
ON
= 3V
415
590
765
Output Current Multiplication Ratio
OCMR
I
SET
= 25A, V
SAT
= 1000mV, V
ON
= 3V
470
670
870
Output Current Multiplication Ratio
OCMR
I
SET
= 40A, V
SAT
= 1000mV, V
ON
= 3V
460
660
860
Output Current Multiplication Ratio
OCMR
I
SET
= 75A, V
SAT
= 1000mV, V
ON
= 3V
440
630
820
LED-to-LED Current Matching
Match
V
ON
= 3V
-3
3
%
I
SET
in OFF Mode
I
SET,OFF
V
CTRL
= 3V, V
SAT
= 3V, V
ON
= 0V
0.1
1
A
I
IN
in OFF Mode
I
IN,OFF
V
CTRL
= 3V, V
SAT
= 3V, V
ON
= 0V,
T
AMB
= 25C
0.1
1
A
V
CTRL
= 3V, V
SAT
= 3V, V
ON
= 0V
4
Peak Efficiency
EFF
V
IN
= 3V, V
ON
= 3V
95
%
www.austriamicrosystems.com
Revision 1.3
4 - 13
AS1101, AS1102, AS1103, AS1104
austria
micro
systems
Data Sheet
Electrical Characteristics AS1102, AS1103, AS1104
5.2 Electrical Characteristics AS1102, AS1103, AS1104
Conditions: T
AMB
= 25C (unless otherwise noted).
Table 4. Electrical Characteristics AS1102, AS1103
,
AS1104
Parameter
Symbol
Conditions
Min
Typ Max Units
I
SET
Range
I
SET
VON = 3V
25
150
A
Output Current Multiplication Ratio
OCMR
I
SET
= 25A, V
SAT
= 150mV, V
ON
= 3V
175
250
325
Output Current Multiplication Ratio
OCMR
I
SET
= 40A, V
SAT
= 150mV, V
ON
= 3V
170
240
310
Output Current Multiplication Ratio
OCMR
I
SET
= 75A, V
SAT
= 150mV, V
ON
= 3V
145
210
275
Output Current Multiplication Ratio
OCMR
I
SET
= 25A, V
SAT
= 600mV, V
ON
= 3V
215
310
405
Output Current Multiplication Ratio
OCMR
I
SET
= 40A, V
SAT
= 600mV, V
ON
= 3V
215
305
395
Output Current Multiplication Ratio
OCMR
I
SET
= 75A, V
SAT
= 600mV, V
ON
= 3V
205
295
385
Output Current Multiplication Ratio
OCMR
I
SET
= 25A, V
SAT
= 1000mV, V
ON
= 3V
235
335
435
Output Current Multiplication Ratio
OCMR
I
SET
= 40A, V
SAT
= 1000mV, V
ON
= 3V
230
330
430
Output Current Multiplication Ratio
OCMR
I
SET
= 75A, V
SAT
= 1000mV, V
ON
= 3V
220
315
410
LED-to-LED Current Matching
Match
V
ON
= 3V
-3
3
%
I
SET
in OFF Mode
1
1. Not applicable to AS1103
.
I
SET,OFF
V
CTRL
= 3V, V
SAT
= 3V, V
ON
= 0V
0.1
1
A
I
IN
in OFF Mode
2
2. Not applicable to AS1103
.
I
IN,OFF
V
CTRL
= 3V, V
SAT
= 3V, V
ON
= 0V,
T
AMB
= 25C
0.1
1
A
V
CTRL
= 3V, V
SAT
= 3V, V
ON
= 0V
2
Peak Efficiency
3
3. Efficiency = (V
IN
- V
SAT
) / V
IN
. Information parameter, guaranteed by design.
EFF
V
IN
= 3V, V
ON
= 3V
95
%
www.austriamicrosystems.com
Revision 1.3
5 - 13
AS1101, AS1102, AS1103, AS1104
austria
micro
systems
Data Sheet
6 Typical Performance Characteristics
I
SET
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
V
CTRL
(V)
I
SET
(A)
AS1102-AS1104 I
LED
vs V
SAT
5
10
15
20
25
30
0.0
0.2
0.4
0.6
0.8
1.0
V
SAT
(V)
I
LE
D
(mA)
I
SET
= 100A
I
SET
= 50A
I
SET
= 25A
AS1101 I
LED
vs V
SAT
5
10
15
20
25
30
35
0.0
0.2
0.4
0.6
0.8
1.0
V
SAT
(V)
I
LE
D
(mA)
I
SET
= 50A
I
SET
= 25A
AS1102-AS1104 I
LED
vs R
SET
4
6
8
10
12
14
16
18
20
22
0
20
40
60
80
100
120
140
160
R
SET
(k
)
I
LE
D
( mA)
Vsat=0.6V
Vsat=0.5V
Vsat=0.4V
Vsat=0.3V
AS1102-AS1104 I
LED
vs R
SET
0
5
10
15
20
25
30
35
0
20
40
60
80
100
120
140
160
180
200
R
SET
(k
)
I
LE
D
(mA)
Vsat=1V
Vsat=0.6V
Vsat=0.3V
Vsat=0.15V
AS1101 I
LED
vs R
SET
2
4
6
8
10
12
14
16
18
20
22
10
20
30
40
50
60
70
80
90
100
R
SET
(k
)
I
LE
D
(m
A
)
Vsat=0.30V
Vsat=0.25V
Vsat=0.20V
Vsat=0.15V
Vsat=0.10V
Vsat=0.05V
I
LED
vs Tem perature (V
LED
= 0.25V, I
SET
= 50A)
11
11.5
12
12.5
13
-40
-20
0
20
40
60
80
100
Tem perature (C)
I
LE
D
in m
A
I
SET
vs V
SET
(R
SET
= 30k
)
0
10
20
30
40
50
60
70
80
90
100
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
V
SET
(V)
I
SET
in
A
PDF 
ZIP