SP1938

SP1938 DC-DC Step-Up Converter for White LED DESCRIPTION The SP1938 is a step-up DC/DC converter for white LED driver with over voltage protection. The device can driver one to four LEDs in series from a single cell Lithium Ion battery. Internal functions include current limiting; thermal shutdown; OVP and soft-start to prevent damage operate status. The SP1938 operates at 0.8MHz apply to Lithium-Ion powered systems. A low 95mV reference voltage minimizes power loss in the current setting resistor for better efficiency. The SP1938 is available in small package SOT-23-6L. APPLICATIONS  Battery Power Equipment  Notebook Computers  PDA  Cellular Phone FEATURES  Current Source with Over Voltage Protection  Fast 0.8MHz Switching Frequency  High Efficiency up to 87%  Drives up to Four LEDs From 3.2V Supply  Drives up to Six LEDs From a 5V Supply  Low Quiescent Current  Disconnects LEDs in Shutdown Mode  Internal Over Temperature and Current Limiting Shutdown Function  Internal Soft-Start Circuit  26V Rugged Bipolar Switch  Available in a Small SOT-23-6L Package PIN CONFIGURATION(SOT-23-6L) PART MARKING 2020/07/08 Ver 6 Page 1 SP1938 DC-DC Step-Up Converter for White LED TYPICALAPPLCATION CIRCUIT PIN DESCRIPTION Pin Symbol 1 SW 2 GND 3 FB 4 SHDN 5 OVP 6 VIN Description Connect inductor/diode here Ground Pin Connect cathode of lowest LED and resistor here Combined active low enable and PWM control pin for LED dimming Over voltage Protection and C...