LDS8845 4-Channel Ultra Low Dropout No Noise LED Driver FEATURES o Ultra-low dropout PowerLite Current Regulator* o Drives up to 4 LEDs at 30 mA each o PWM brightness control o Power efficiency >95% o Low input noise & ripple o Low current shutdown mode o Load disconnect in shutdown mode o Short circuit protection o Thermal shutdown protection LED current is easily adjustable by an external o Avalable in 3 x 3 x 0.8 mm and 4 x 4 x 0.8 mm resistor up to 30 mA per channel. 16-pin TQFN packages The CTRL0 and CTRL1 logic inputs function as a APPLICATION LED enable and a PWM mode LED brightness control. o Keypad and Display Backlight o Cellular Phones The driver supports a wide range of input voltages from 2.7 V to 5.5 V. o Digital Still Cameras o PDAs and Smartphones The thermal and short circuit protection guarantee high device reliability. DESCRIPTION The device is available in a 16-pin TQFN 3 x 3 mm The LDS8845 is a high efficiency ultra-low dropout and 4 x 4 mm packages with a max height of 0.8 mm current regulator that can drive up to four LEDs. The . TYPICAL APPLICATION CIRCUIT 2009 IXYS Corp. 1 Doc. No. 8845DS, Rev. N1.6 Characteristics subject to change without noticeLDS8845 ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit V , LEDx voltage -0.3 to 6 V IN V voltage -0.3 to 6 V OUT EN, CTRL0, CTRL1 voltage V + 0.7V V IN Storage Temperature Range -65 to +150 C Junction Temperature Range -40 to +125 C Soldering Temperature (10s) 300 C ESD protection HBM 2 kV NOTE: Stresses listed above may cause permanent damage to thje device. Functional operation of the device at these or any other conditions beyond those indicated in the Recommended Operating Conditions is not impiled. Exposure to abslute maximum rating conditions for extended periods may remain possibility to affect device reliability. RECOMMENDED OPERATING CONDITIONS Parameter Rating Unit V 2.7 to 5.5 V IN Ambient Temperature Range -40 to +85 C ELECTRICAL OPERATING CHARACTERISTICS (Over recommended operating conditions unless specified otherwise) V = 3.6V, EN = High, T = 25C IN AMB Name Conditions Min Typ Max Units Quiescent Current I = 20mA per channel 1.3 1.5 mA LED Shutdown Current 0.1 1 A EN = 0V 20 R = 24k SET LED Current mA 5 R = 96k SET LED Current Setting Range 2 30 mA 2.7 < V < 5.5V IN LED Current Accuracy To set value -8 3 +8 % (I I ) / LED MAX LED MIN LED Channel Matching -5 3 +5 % (I + I ) LED MAX LED MIN Current Sink Dropout Voltage* 20 30 mV Short Circuit Output Current Limit V = 0V 22 25 mA OUT High Input Voltage = V 1 IN Leakage Current A Low Input Voltage = 0 -1 EN, CTRL0, CTRL1 pins High 1.3 Logic Level V Threshold Low 0.4 PWM frequency 100 100000 Hz PWM duty cycle 1 100 % Thermal Shutdown 150 C Thermal Hysteresis 20 Under Voltage Lockout (UVLO) 2.4 V Threshold *) Voltage drop at led pin, at which LED current falls 10% below set value 2009 IXYS Corp. 2 Doc. No. 8845DS, Rev. N1.6 Characteristics subject to change without notice