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The technical content of this austriamicrosystems datasheet is still valid.
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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
Data Sheet
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 program-
mable using an external resistor (R
SET
).
The AS1101 LED currents are 460 x I
SET
(per LED, typ)
at an LED cathode voltage (V
SAT
) of 150mV and 650 x
I
SET
(typ) at a V
SAT
of 1V, where I
SET
is the current
through R
SET
connected to pin CTRL.
The AS1102, AS1103, and AS1104 LED currents are
230 x I
SET
(per LED, typ) at a V
SAT
of 150mV and 325 x
I
SET
(typ) at a V
SAT
of 1V.
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 1µA.
2 Key Features
!
!
LED Drivers for Parallel-Connected LEDs
!
!
!
!
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 1µA
MSOP-8 Package (AS1104)
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
V
SET
(3V)
ENABLE
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V
SET
(3V)
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!
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!
SC70-6 Package (AS1101, AS1102, and AS1103)
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.
3 Diode Control with Enable
V
IN
2 Diode Control with Enable
V
IN
I1/I2 V
SAT
I3/I4
I1 V
SAT
I
SET
I
SET
R
SET
CTRL
ON
AS1101
V
SET
(3V)
R
SET
CTRL
AS1102
ENABLE
ON
GND
GND
4 Diode Control
4 Diode Control with Enable
V
IN
V
IN
I1 V
SAT
I2
I3
I4
I
SET
V
SET
(3V)
I1 V
SAT
I2
I
SET
R
SET
CTRL
AS1103
GND
R
SET
CTRL
ON
AS1104
GND
ENABLE
Revision 1.5
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I3
I3
I4
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Ultra-Low Voltage Drop: Less Than 150mV (for Li-
ion Battery Support)
AS1101/AS1102/AS1103/AS1104
Data Sheet
- P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments – (Top View)
I1/I2
N/C
2
AS1101
5
I3/I4
GND
I2
I1
2
AS1102
5
I3
GND
I2
I1
2
AS1103
5
3
4
3
4
3
6-Pin SC70
Pin Descriptions
Pin Number
Table 1. Pin Descriptions
(see Figure 2)
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N/C
I3
I4
2
7
CTRL
I2
AS1104
3
4
6
5
GND
I1
8-Pin MSOP
Pin Name
CTRL
I1
I2
I3
I4
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.
GND
ON
Revision 1.5
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GND
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I4
CTRL
1
6
ON
CTRL
1
6
ON
CTRL
1
6
I3
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 reli-
ability.
Table 2. Absolute Maximum Ratings
V
I1
, V
I2
, V
I3
, V
I4
, CTRL and ON Voltage to GND
Power Dissipated by Device at T
AMB
= 85°C
I1, I2, I3, I4 Steady State Current
Package Body Temperature
Junction Temperature
Storage Temperature
†
-0.3
5
200
250
100
260
150
V
mW
mW
mA
ºC
ºC
ºC
SC70-6
MSOP-8
Electrostatic Discharge Protection (ESD) Level
†
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”.
Operating Conditions
Parameter
Table 3. Recommended Operating Conditions
Enable Voltage ON Mode
Enable Voltage OFF Mode
Ambient Temperature
†
Not applicable to AS1103.
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2
150
kV
Min
Typ
0.6
Max
3.6
Unit
V
Comments
LED Cathode Voltage
0.15
2.2
0
†
Human Body Model;
Norm: MIL-STD883E 3015
methods.
3.0
3.6
V
†
0.2
25
0.5
85
V
-40
ºC
Revision 1.5
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Parameter
Min
Max
Unit
Comment
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
T
AMB
= 25°C (unless otherwise noted).
Table 4. Electrical Characteristics – AS1101
Parameter
I
SET
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
I
SET
in OFF Mode
Symbol
I
SET
OCMR
OCMR
OCMR
OCMR
OCMR
OCMR
OCMR
OCMR
OCMR
Match
Conditions
V
ON
= 3V
I
SET
= 25µA, V
SAT
= 150mV, V
ON
= 3V
I
SET
= 40µA, V
SAT
= 150mV, V
ON
= 3V
I
SET
= 75µA, V
SAT
= 150mV, V
ON
= 3V
I
SET
= 25µA, V
SAT
= 600mV, V
ON
= 3V
I
SET
= 40µA, V
SAT
= 600mV, V
ON
= 3V
I
SET
= 75µA, V
SAT
= 600mV, V
ON
= 3V
Min
25
350
335
295
435
425
415
500
480
420
620
610
590
Typ
Max Units
150
650
625
545
805
795
765
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I
SET
= 25µA, V
SAT
= 1000mV, V
ON
= 3V
I
SET
= 40µA, V
SAT
= 1000mV, V
ON
= 3V
I
SET
= 75µA, V
SAT
= 1000mV, V
ON
= 3V
V
ON
= 3V
470
460
440
-3
670
660
630
I
SET,OFF
V
CTRL
= 3V, V
SAT
= 3V, V
ON
= 0V
0.1
I
IN
in OFF Mode
I
IN,OFF
V
CTRL
= 3V, V
SAT
= 3V, V
ON
= 0V,
T
AMB
= 25ºC
V
CTRL
= 3V, V
SAT
= 3V, V
ON
= 0V
V
IN
= 3V, V
ON
= 3V
0.1
Peak Efficiency
†
η
†
Efficiency = (V
IN
- V
SAT
)/V
IN
. Information parameter, guaranteed by design.
AS1102, AS1103, AS1104 Electrical Characteristics
T
AMB
= 25°C (unless otherwise noted).
Table 5. Electrical Characteristics – AS1102, AS1103
,
AS1104
Parameter
Symbol
I
SET
Conditions
V
ON
= 3V
I
SET
Range
Output Current Multiplication Ratio
OCMR
OCMR
OCMR
OCMR
OCMR
OCMR
OCMR
OCMR
OCMR
I
SET
= 25µA, V
SAT
= 150mV, V
ON
= 3V
Output Current Multiplication Ratio
I
SET
= 40µA, V
SAT
= 150mV, V
ON
= 3V
I
SET
= 75µA, V
SAT
= 150mV, V
ON
= 3V
I
SET
= 25µA, V
SAT
= 600mV, V
ON
= 3V
I
SET
= 40µA, V
SAT
= 600mV, V
ON
= 3V
I
SET
= 75µA, V
SAT
= 600mV, V
ON
= 3V
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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
I
SET
= 25µA, V
SAT
= 1000mV, V
ON
= 3V
I
SET
= 40µA, V
SAT
= 1000mV, V
ON
= 3V
I
SET
= 75µA, V
SAT
= 1000mV, V
ON
= 3V
Revision 1.5
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870
860
820
3
%
µA
1
1
µA
4
%
95
Min
25
Typ
Max Units
150
µA
175
170
145
215
215
205
235
230
220
250
240
210
310
305
295
335
330
315
325
310
275
405
395
385
435
430
410
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