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
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
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
SYNC-POWER [ SYNC POWER CROP. ]
