AS1101 Datasheet, PDF (1/13 Pages) ams AG – Low-Dropout LED Drivers

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AS1101, AS1102, AS1103, AS1104
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 ISET (per
LED) at an LED cathode voltage of 150mV and typical
650 x ISET at an LED cathode voltage of 1V.
The AS1102, AS1103, and AS1104 LED currents are
typical 230 x ISET (per LED) at an LED cathode voltage
of 150mV and typical 325 x ISET at an LED cathode volt-
age of 1V where ISET 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.
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 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.
2 Diode Control with On/Off
VIN
3 Diode Control with On/Off
VIN
VSET(3V)
ENABLE
ISET
RSET
I1/I2 I3/I4
CTRL _AS1101
ON
GND
VSET(3V)
ENABLE
ISET
RSET
I3
I2
I1
CTRL _AS1102
ON
GND
4 Diode Control
VIN
VSET(3V)
I4 I3 I2 I1
ISET
CTRL _AS1103
RSET
GND
4 Diode Control with On/Off
VIN
VSET(3V)
ENABLE
ISET
I4 I3 I2 I1
RSET ^{CTRL AS1104}
ON
GND
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