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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 ...

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SeekIC No. : 004506300 Detail

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 Cur...

ST1937 Data Sheet

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Part Number:
ST1937
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/10/18

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Product Details

Description



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


Application

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


Pinout

Connection Diagram


Specifications

Symbol
 Parameter
Value
Unit
VIN
 DC Supply Voltage
10
V
VSW
 SW Voltage
36
V
VFB
 FB Voltage
10
V
VSHDN
 SHDN Voltage
10
V
TOPR
 Operating Temperature
-40〜85
T J(Max)
 Maximum Junction Temperature
125
TS
 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.


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.




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