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LM1937SF5 bảng dữ liệu(PDF) 1 Page - HTC Korea TAEJIN Technology Co. |
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LM1937SF5 bảng dữ liệu(HTML) 1 Page - HTC Korea TAEJIN Technology Co. |
1 / 6 page WHITE LED STEP-UP CONVERTER LM1937 FEATURES • Inherently Matched LED Current • High Efficiency: 84% Typical • Drives Up to Four LEDs from a 3.2V Supply • Drives Up to Six LEDs from a 5V Supply • 36V Rugged Bipolar Switch • Fast 1.2MHz Switching Frequency • Uses Tiny 1mm Tall Inductors • Requires Only 0.22µF Output Capacitor • Moisture Sensitivity Level 3 APPLICATIONS • Cellular Phones • PDAs, Handheld Computers • Digital Cameras • MP3 Players • GPS Receivers ORDERING INFORMATION DESCRIPTION TYPICAL APPLICATION CIRCUIT Figure 1. Li-Ion Powered Driver for Three White LEDs Jul. 2010 - Rev. 1.1.1 HTC - 1 - Package Marking Device LM1937SF5 1937 SOT-23 5L 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. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The output capacitor can be as small as 0.22µF, saving space versus alternative solutions. A low 95mV feedback voltage minimizes power loss for better efficiency. SOT-23 5L (SOT-25) 1.SW 2.GND 3.FB 4.SHDN 5.VIN |
Số phần tương tự - LM1937SF5 |
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Mô tả tương tự - LM1937SF5 |
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