ZXLD1937 1W恒流LED升压驱动芯片
The ZXLD1937 is a PFM inductive boost converter digned for driving 2, 3 or 4 seri connected white LEDs from a Li-Ion cell and up to 8 LEDs from a 5V supply. The device operat from an input supply of between 2.5V and 5.5V and provid an adjustable output current of up to 50mA. The ZXLD1937 includ the output switch and peak current sense ristor, and can operate with a maximum output voltage of 28V. Quicent current is tically 60H9262A and a shutdown function is provided to reduce this current to ls than 500nA in the 'off' state.
FEATUR： 1mm height profile TSOT23-5 pin package； Internal PWM filter for flicker free output；High efficiency (80% t)；Wide input voltage range: 2.5V to 5.5V； Up to 50mA output current； Low quicent current: (60H9262A t)； 500nA maximum shutdown current； Up to 1MHz switching frequency；Low external component count；Inherently matched LED currents；Output current can be adjusted by applying a PWM；control signal to the 'Enable' pin.
APPLICATIONS： Mobile phon； Dial cameras； PDAs； LCD modul； Portable internet applianc； Palm computers.
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详细规格书请参阅：https://www.yuketek.com/product/32.html
