IS32LT3141A中文资料Single channel 450ma led driver with 1-wire serial bus interface and single led detection数据手册Lumissil规格书

描述 Description

The IS32LT3141A is a linear programmable current regulator consisting of a single output channel capable of 450mA. It features an EN pin to enable and disable the output channel’s current source. It supports 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, IS32LT3141A integrates fault protection for single LED short, 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 can disable itself and output an open drain low signal. Multiple devices can have their FAULTB pins connected to create a “one-fails-all-fail” condition.

The IS32LT3141A 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 eTSSOP-14 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: ▪ Selectable fault actions ▪ Single LED short ▪ 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 interior/exterior lighting: ▪ Turn signal light ▪ Rear lamp ▪ Dome light