MIC3287中文资料1.2MHz PWM White LED Driver w/ 24V OVP数据手册Microchip规格书

描述 Description

The MIC3287 is a 1.2MHz pulse-width modulated (PWM) step-up switching regulator that is optimized for constant current white LED driving applications. With a maximum output voltage of 24V and a switch current of over 350mA, the MIC3287 drives a string of up to four white LEDs in series, ensuring uniform brightness and eliminating several ballast resistors.The MIC3287 implements a constant frequency 1.2MHz PWM current-mode control scheme. The high frequency PWM operation saves board space by reducing external component sizes. The added benefit of the constant frequency PWM control scheme as opposed to variable frequency control schemes is much lower noise and input ripple injected back to the battery source. To optimize efficiency, the feedback voltage is set to only 250mV. The MIC3287 is also available with a maximum 24V over voltage protection.The MIC3287 is available in low profile Thin SOT-23 5-pin and Thin SOT-23 6-pin packages. The MIC3287 has a junction temperature range of -40°C to +125°C.

特性 Features

• 2.8V to 6.5V input voltage
• 350mA switch current
• 1.2MHz PWM operation
• 250mV feedback voltage
• Optional 24V output over voltage protection (OVP)
• <1% line and load regulation
• <1µA shutdown current
• Over-temperature protection
• Under voltage lockout (UVLO)
• Low profile Thin SOT-23-5 package option
• Low profile Thin SOT-23-6 package option
• 8-pin 2mm x 2mm MLF®package option
• -40°C to +125°C junction temperature range

简介

MIC3287属于集成电路（IC）的LED驱动器。由制造生产的MIC3287LED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。