描述 Description

The MIC2287 is a 1.2MHz pulse width modulated (PWM), boost-switching regulator that is optimized for constant-current, white LED driver applications. With a maximum output voltage of 34V and a switch current of over 500mA, the MIC2287 easily drives a string of up to eight white LEDs in series, ensuring uniform brightness and eliminating several ballast resistors.The MIC2287 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 as opposed to variable frequency topologies is much lower noise and input ripple injected back to the battery source.To optimize efficiency, the feedback voltage is set to only 95mV. This reduces the power dissipation in the current set resistor and allows the lowest total output voltage, hence minimal current draw from the battery.The MIC2287 is available with three levels of overvoltage protection, 15V, 24V, and 34V. This allows designers to choose the smallest possible external components with the appropriate voltage ratings for their applications.The MIC2287 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
? Over 500mA switch current
? 1.2 MHz PWM operation
? 95mV feedback voltage
? Output over voltage protection (OVP)
? Options for 15V, 24V, and 34V OVP
? <1% line and load regulation
? <1μA shutdown current
? Over-temperature protection
? UVLO
? Low profile Thin SOT-23-5 package option
? -40°C to +125°C junction temperature range

簡介

MIC2287屬于集成電路（IC）的LED驅(qū)動(dòng)器。由制造生產(chǎn)的MIC2287LED 驅(qū)動(dòng)器器件屬于 LED 驅(qū)動(dòng)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），而且通常可對(duì)器件工作點(diǎn)進(jìn)行外部控制，可在照明應(yīng)用中用于實(shí)現(xiàn)調(diào)光功能。