SP1938 Datasheet, PDF (1/6 Pages) SYNC POWER Crop. – DC-DC Step-Up Converter for White LED

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 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.
APPLICATIONS
z Battery Power Equipment
z Notebook Computers
z PDA
z Cellular Phone
FEATURES
z Current Source with Over Voltage Protection
z Fast 0.8MHz Switching Frequency
z High Efficiency up to 87%
z Drives up to Four LEDs From 3.2V Supply
z Drives up to Six LEDs From a 5V Supply
z Low Quiescent Current
z Disconnects LEDs in Shutdown Mode
z Internal Over Temperature and Current Limiting
Shutdown Function
z Internal Soft-Start Circuit
z 36V Rugged Bipolar Switch
‹ Available in a Small SOT-23-6L Package
PIN CONFIGURATION(SOT-23-6L)
PART MARKING
2009/03/30 Ver.1
Page 1