Convertor provides constant current and voltage
Linear Technology
LT3477
The LT3477 is a current-mode fixed-frequency DC/DC convertor with dual rail-to-rail current sense amplifiers and an internal 3A, 42V switch.
New from Linear Technology, the LT3477 is a current-mode fixed-frequency DC/DC convertor with dual rail-to-rail current sense amplifiers and an internal 3A, 42V switch.
The LT3477 operates from an input voltage range of 2.5 to 25V, making it suitable for a wide variety of applications.
It combines a traditional voltage feedback loop and two unique current feedback loops to operate as a constant current and a constant voltage source that is ideal for driving high-current LEDs.
Both inputs of the error amplifier are available to the user, allowing the LT3477 to be used as either a boost convertor, sepic or an inverter.
It can also be configured as a buck-boost mode or buck-mode LED driver, enabling it to operate in a wide array of applications, even those with fluctuating voltage inputs such as an automotive battery.
In addition, its switching frequency can be programmed with a single resistor between 200kHz and 3.5MHz, enabling the designer to minimise external component sizes and avoid "noise critical" frequency bands in the system.
A tiny low profile inductor and ceramic capacitors keep solution footprints very compact and minimise solution cost.
The LT3477's low-saturation-voltage switch, 0.3V at 2.5A, operates at efficiencies of up to 91%.
It features a programmable soft-start function to limit inductor current during startup and inrush current protection to protect the LT3477 during shorts and line transients.
The low profile (0.75mm) 4 x 4mm QFN-20 package provides excellent thermal performance in a small footprint.
The LT3477 is also available in a thermally enhanced 20-pin TSSOP package.
The 4 x 4mm QFN-20 version, the LT3477EUF, and the TSSOP-16E version, the LT3477EFE, are available from stock.
Pricing for the LT3477EUF starts at $3.15 each and $3.30 each for the LT3477EFE in 1000-piece quantities.
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