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ST1937, ST194 E6327(MRS), ST1948

Table of contents:
Info of ST1937
Info of ST194 E6327(MRS)
Info of ST1948

ST1937, ST194 E6327(MRS), ST1948 Selling Leads, Datasheet

MFG:ST Package Cooled:SOT23-5L D/C:07+

ST1937, ST194 E6327(MRS), ST1948 Picture

ST1937, ST194 E6327(MRS), ST1948 Datasheet download

Five Points

Part Number: ST1937

MFG: ST

Package Cooled: SOT23-5L

D/C: 07+

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ST1937 General Description

The 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.

The 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.

ST1937 Maximum Ratings

Symbol	Parameter	Value	Unit
V_IN	DC Supply Voltage	10	V
V_SW	SW Voltage	36	V
V_FB	FB Voltage	10	V
V_SHDN	SHDN Voltage	10	V
T_OPR	Operating Temperature	-40〜85
T_J(Max)	Maximum Junction Temperature	125
T_S	Storage Temperature	-65〜150

The IC has a protection circuit against static electricity. Do not apply high static electricity or high
voltage that exceeds the performance of the protection circuit to the IC.

ST1937 Features

·Fast 1.2MHz Switching Frequency
·High Efficiency up to 85%
·Drives up to Four LEDs From 3.2V Supply
·Low Quiescent Current
·Disconnects LEDs in Shutdown Mode
·Internal Over Temperature and Current Limiting Shutdown Function
·Internal 18V Rugged Switch
·Internal Soft-Start Circuit
·Available in a Small SOT-23-5L & SOT-353 Package

ST1937 Typical Application

·Battery Powered Devices
·Digital Camera
·PDA
·GPS
·Hand Held Communication Equipment
·MP3/4

ST1937 Connection Diagram

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