IC LED driver AS1104

PWM

40mA 4-channel direct LED driver IC 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 ISET (per LED, typ) at an LED cathode voltage (V SAT) of 150mV and 650 x ISET (typ) at a VSAT 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 VSAT of 150mV and 325 x ISET (typ) at a VSAT of 1V. The AS1101, AS1102, and AS1104 incorporate a chip-enable feature via pin ON. When the devices are disabled, 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 MSOP package 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 Components ■Active-Low Shutdown Mode (AS1101, AS1102,and AS1103) ■Low Shutdown-Current: Less Than 1pA ■SC70-6 Package (AS1101, AS1102, and AS1103) ■MSOP-8 Package (AS1104)