MIC2297中文资料40V PWM Boost Regulator White LED Driver数据手册Microchip规格书

描述 Description

The MIC2297 is a 600kHz PWM boost-switching regulator that is optimized for driving 6-10 series white LEDs. With its internal 40V switch and a guaranteed switch current of 1.2A, the MIC2297 easily drives a string of 10 white LEDs in series at 20mA, ensuring a high level of brightness and eliminating several ballast resistors.

The MIC2297 implements constant frequency 600kHz PWM control. The high frequency PWM operation saves board space by reducing external component sizes. The added benefit of the constant frequency PWM operation is much lower noise and input ripple injected back to the battery source than with variable frequency topologies.

To optimize efficiency, the feedback voltage is set to 200mV. This reduced voltage reduces the power dissipation in the current set resistor, and allows the lowest total output voltage, hence minimal current draw from the battery.

The MIC2297 is available with output over voltage protection that protects the IC and external components in case of open LED conditions.

The MIC2297 has a junction temperature range of -40°C to +125°C.

特性 Features

• 2.5V to 10V input voltage range
• Output voltage up to 40V
• 1.2A switch current
• 600kHz PWM operation
• Trimmed 200mV feedback voltage
• Output over voltage protection (fixed or adjustable)
• PWM brightness control
• DAC brightness control
• <1% line regulation
• 1µA shutdown current
• Over temperature protection
• UVLO
• -40 °C to +125 °C junction temperature range

简介

MIC2297属于集成电路（IC）的LED驱动器。由制造生产的MIC2297LED 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。