LDS8711

LDS8711 High Efficiency 10 LED Driver with No External Schottky either in PWM or in Smart OneWire™ Interface mode. The Smart OneWire™ Interface mode allows set LED current in the range from 0.125 to 32 mA in 256 steps of 0.125 mA each. In PWM mode, LDS8711 operates with either factory, or customer preset maximum LED current values. Series connection of the LEDs provides constant current and subsequently uniform brightness, eliminating the need for ballast resistors and factory calibration. Operation at 0.7 MHz allows use of small value inductor (10 – 33 µH) and external ceramic capacitor (1 – 2.2 µF). The use of integrated rectifier makes the efficiency dependent on only two external components parameters: inductor DCR and external capacitor ESR. The supply voltage down to 2.7 V for new Li-ion battery chemistries or two alkaline battery cells extends the battery life. Under-voltage protection disables the part when VIN voltage reaches 2.0 V 0 The LDS8711 has thermal shutdown set at 150 C. Above this value , the boost converter stops switching. The part resumes normal operations when 0 temperature drops below 130 C. The over-current protection provides cycle-by-cycle current limit. The internal output over-voltage protection prevents damage in the case of a faulty LED disconnect. FEATURES  High efficiency boost converter with the input voltage range from 2.7 to 5.5 V  250 mV current sense voltage  Drives one LED string with 10 LEDs in series up to 32 mA  No external Schottky Required (Internal synchronous rectifier*)  0.7 MHz Switching Frequency  Efficiency greater than 83%  Smart OneWire™ Interface and PWM LED Brightness Control Modes Provide Constant ILED current or constant color temperature brightness control  Small External Inductor (10 µH – 33 µH)  Over voltage, under voltage, over temperature, over current protection  Low Shutdown Current (