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35 pcs
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35 pcs | On Request | 1 | On Request | On Request | 12+ | On Request | On Request |
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The LT1937ES5#PBF by Linear Technology is a step-up DC/DC converter specifically engineered for driving white LEDs with a constant current. This device is capable of driving two, three, or four LEDs in series from a Li-Ion cell, ensuring uniform brightness by providing identical LED currents and eliminating the need for ballast resistors.
Key electrical specifications include a high efficiency of 84% typical and a fast switching frequency of 1.2MHz, which allows for the use of tiny external components. The converter features a low feedback voltage of 95mV, minimizing power loss in the current setting resistor for improved efficiency. It can drive up to four LEDs from a 3.2V supply or up to six LEDs from a 5V supply, with a rugged 36V bipolar switch.
The LT1937ES5#PBF is available in low-profile SC-70 and ThinSOT packages, making it suitable for space-constrained applications. The output capacitor requirement is as low as 0.22µF, contributing to space and cost savings. Typical applications include cellular phones, PDAs, handheld computers, digital cameras, MP3 players, and GPS receivers.
The typical switching frequency is 1.2MHz.
The typical efficiency is 84%.
The feedback voltage is 95mV.
A minimum 0.22µF output capacitor is required.
Up to 4 LEDs from a 3.2V supply or up to 6 LEDs from a 5V supply.
The switch voltage rating is 36V.
It is available in SC-70 and SOT-23 surface-mount packages.