HTC KOREA LM1937
The LM1937 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive two, three or four LEDs in series from a Li-Ion cell. The output capacitor can be as small as 0.22µF, saving space versus alternative solutions.| Part No. | LM1937 |
|---|---|
| Datasheet | LM1937 Download |
| Manufacturer |  HTC KOREA |
| Description | White LED Step-Up Converter |
| Buy | Stock & Price |
FEATURES
● Inherently Matched LED Current● High Efficiency : 84% Typical
● Drives Up to 4 LEDs from a 3.2V Supply
● Drives Up to 6 LEDs from a 5V Supply
● Power Management IC
● 36V Rugged Bipolar Switch
● Fast 1.2MHz Switching Frequency
● Uses Tiny 1mm Tall Inductors
● Requires Only 0.22µF Output Capacitor
● Moisture Sensitivity Level 3 APPLICATION
● Cellular Phones
● PDAs, Handheld Computers
● Digital Cameras
● MP3 Players
● GPS Receivers LM1937 SOT-23 5L PKG ORDERING INFORMATION Device LM1937SF5 Package SOT-23 5L
DESCRIPTION
Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. A low 95mV feedback voltage minimizes power loss for better efficiency.ABSOLUTE MAXIMUM RATINGS
(Note 1) CHARACTERISTIC SYMBOL RATINGS Input Voltage VIN 10 SW Voltage VSW 36 FB Voltage VFB 10 SHDN Voltage VSHDN 10 Lead Temperature (Soldering, 5 sec) TSOL 260 Storage Temperature Range TSTG -65 ~ 125 Operating Temperature Range TOPR -40 ~ 85 Maximum Junction Temperature TJ(max) 125 Note 1.
