描述 Description

The MIC2289C is a pulse-width modulated (PWM), boost-switching regulator that is optimized for constant-current white LED driver applications. The MIC2289C features an internal Schottky diode and three levels of output overvoltage protection providing a small size and efficient DC/DC solution that requires only four external components.To optimize efficiency, the feedback voltage is set to only 95mV. This reduces power dissipation in the current set resistor and allows the lowest total output voltage, hence minimal current draw from the battery.The MIC2289C implements a constant frequency 1.2MHz PWM control scheme. The high frequency, PWM operation saves board space by reducing external component sizes. The added benefit of the constant frequency PWM scheme in caparison to variable frequency in much lower noise and input ripple injected to the input power source.The MIC2289C clamps the output voltage in case of open LED conditions, protecting itself and the output capacitor. The MIC2289C is available with an output OVP option of 34V.The MIC2289C is available in low profile 6-pin Thin SOT-23 package. The MIC2289C has a junction temperature range of -40°C to +125°C.

特性 Features

? 2.5V to 10V input voltage
? Output voltage up to 34V with OVP
? Internal Schottky diode
? Over 500mA switch current
? 1.2MHz PWM operation
? 95mV feedback voltage
? <1% line and load regulation
? <1μA shutdown current
? Over-temperature protection
? UVLO
? Thin SOT-23 6-pin package
? -40°C to +125°C junction temperature range
? For higher performance specifications see the MIC2289

簡介

MIC2289C屬于集成電路（IC）的LED驅(qū)動器。由制造生產(chǎn)的MIC2289CLED 驅(qū)動器器件屬于 LED 驅(qū)動器電源管理集成電路 (PMIC) 系列，可通過標(biāo)稱固定電壓的電源為負(fù)載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調(diào)節(jié)的類似產(chǎn)品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通?？蓪ζ骷ぷ鼽c進(jìn)行外部控制，可在照明應(yīng)用中用于實現(xiàn)調(diào)光功能。