AS1101, AS1102, AS1103, AS1104
Low-Dropout LED Drivers
austria
micro
systems
Data Sheet
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 AS11 04 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 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
V
IN
VSET(3V)
RSET
CTRL
GND
AS1102
ISET
3 Diode Control with On/Off
I2 I1I3
V
IN
RSET
ON
ENABLE
CTRL
GND
AS1103
ISET
4 Diode Control
I2 I1I3I4
V
IN
RSET
ON
ENABLE
CTRL
GND
AS1101
ISET
2 Diode Control with On/Off
I1/I2 I3/I4
V
IN
RSET
ON
ENABLE
VSET(3V)
V
SET(3V)
V
SET(3V)
