austria
micro
systems
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 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 1µA.
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.
2 Key Features
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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 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 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
V
IN
V
IN
3 Diode Control with On/Off
I
SET
V
SET
(3V)
R
SET
ENABLE
ON
CTRL
I1/I2
I3/I4
V
SET
(3V)
I
SET
R
SET
ENABLE
I3
CTRL
ON
I2
I1
AS1101
GND
AS1102
GND
4 Diode Control
V
IN
V
IN
4 Diode Control with On/Off
I
SET
V
SET
(3V)
R
SET
I4
CTRL
I3
I2
I1
V
SET
(3V)
I
SET
R
SET
ENABLE
I4
CTRL
ON
I3
I2
I1
AS1103
GND
AS1104
GND
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