SP1938-DC-DC Step-Up Converter for White LED DataSheet

DESCRIPTION APPLICATIONS

    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 and from low input voltages as low as 1.5V; 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.

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
􀁺 36V Rugged Bipolar Switch
􀂋 Available in a Small SOT-23-6L Package

APPLICATIONS

􀁺 Battery Power Equipment
􀁺 Notebook Computers
􀁺 PDA
􀁺 Cellular Phone