IS32LT3141B数据手册Lumissil中文资料规格书

描述 Description

The IS32LT3141B is a linear programmable current regulator consisting of a single output channel capable of 450mA. It features a 1-wire serial BUS interface on/off control. The UV pin can be used to set external VCC undervoltage lockout threshold via a resistor divider for fault detection. An external resistor programs the current level for the channel current source. In addition, IS32LT3141B integrates fault protection for LED string open/short, output over current and over temperature condition for robust operation. Detection of these failures is reported by the FAULTB pin. When a fault is detected the device will disable itself and output an open drain low signal. Multiple devices can have their FAULTB pins connected to create a “one-fail-all-fail” condition.

The IS32LT3141B is targeted at the automotive market with end applications to include interior and exterior lighting. For 12V automotive applications the low dropout driver can support one to several LEDs on the output channel.

Both devices are offered in a small thermally enhanced SOP-8-EP package.

特性 Features

• Wide input voltage range, 4.5V to 40V
• Single channel, sources up to 450mA
• High-side external resister sets source current
• ±4% current accuracy over -40°C ~ +150°C
• Low head room voltage, max 700mV at 150mA
• 1-wire Serial BUS interface to control LED on/off
• Programmable VCC undervoltage lockout to match the LED stack
• Fault protection with flag output: ▪ LED string open/short ▪ Output over current (not reported) ▪ Thermal shutdown
• Shared fault flag for multiple devices operation to comply with “one-fails-all-fail” function
• AEC-Q100 qualification in progress
• Operating temperature range from -40°C ~ +150°C

应用 Application

• Automotive exterior lighting: ▪ Sequential turn signal light ▪ Animation rear light