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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
2 Key Features
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.
The AS1101, AS1102, and AS1103 are available in a
6-pin SC70 package; the AS1104 is available in a 8-pin
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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)
MSOP package.
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
Figure 1. Typical Application Diagrams
2 Diode Control with Enable
V IN
players, mobile and cordless phones, PDAs, portable
DVD players, and consumer electronics.
3 Diode Control with Enable
V IN
I1/I2 V SAT
I3/I4
I1 V SAT
I2
I3
V SET
I SET
V SET
I SET
(3V)
R SET CTRL
AS1101
(3V)
R SET CTRL
AS1102
ENABLE
ON
V IN
GND
4 Diode Control
ENABLE
ON
V IN
GND
4 Diode Control with Enable
I1 V SAT I2
I3
I4
I1 V SAT I2
I3
I4
I SET
V SET
(3V)
I SET
R SET CTRL
AS1103
V SET
(3V)
R SET CTRL
AS1104
ENABLE
ON
GND
GND
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