ST1937 Datasheet, PDF (1/6 Pages) Stanson Technology – DC-DC Step-Up Converter for White LED Driver

ST1937
DC-DC Step-Up Converter for White LED Driver
DESCRIPTION
ST1937 is a step-up DC/DC converter for white LED driver with constant current. The device
can driver one to four LEDs in series from a single cell Lithium ion battery. Internal functions
include current limiting; thermal shutdown and soft-start to prevent damage operate status.
ST1937 DC/DC converter operates at 1.2MHz and low output capacitor as small as 0.22uF;
apply to Lithium-Ion powered systems. A low 100mV reference voltage minimizes power loss
in the current setting resistor for better efficiency.
PIN CONFIGURATION
SOT23-5L
SOT-353 ( SC-70-5L )
APPLICATIONS
z Battery Powered Devices
z Digital Camera
z PDA
z GPS
z Hand Held Communication Equipment
z MP3/4
PART MARKING
ORDERING INFORMATION
FEATURES
z Fast 1.2MHz Switching Frequency
z High Efficiency up to 85%
z Drives up to Four LEDs From 3.2V
Supply
z Low Quiescent Current
z Internal Over Temperature and Current
Limiting Shutdown Function
z Internal Soft-Start Circuit
z Available in a Small SOT-23-5L &
SOT-353 Package
Part Number
Package
Part Marking
ST1937S25RG
SOT-23-5L
37YW
ST1937S35RG
SOT-353 ( SC-70-5L )
37YW
※ Week Code : A ~ Z( 1 ~ 26 ) ; a ~ z( 27 ~ 52 )
※ ST1937S25RG : S25 : SOT-23-5 ; R : Tape Reel ; G : Pb – Free
※ ST1937S35RG : S35 : SOT-353 ; R : Tape Reel ; G : Pb – Free
STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
www.stansontech.com
ST1937 2005. V1