IS32LT3144数据手册Lumissil中文资料规格书

描述 Description

The IS32LT3144 device is a linear programmable LED regulator consisting of 3 output channels capable of up to 150mA each. A single resistor sets the maximum current level for all channels. The outputs can be combined to provide a higher current drive capability up to maximum 450mA. It supports individual PWM dimming control to each channel. The analog dimming pin can be used for LED binning or in conjunction with an external NTC to implement LED over temperature thermal roll-off protection.

For added system reliability, IS32LT3144 integrates fault detection circuitry for LED string open/short circuit, single LED short circuit, current setting resistor short, input overvoltage current derating, LED over temperature thermal roll-off, device junction over temperature thermal roll-off and shutdown conditions. Two dedicated fault reporting pins, FAULTB and FAULTS, are able to report fault conditions. The FAULTB pins can all be tied together to disable the device and other IS32LT3144 devices on the same parallel circuit to achieve “one-fail-all-fail” function.

The IS32LT3144 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 channels. The device is offered in a small thermally enhanced eTSSOP-16 package.

特性 Features

• Wide input voltage range: 5V~40V
• Three output channels with programmable constant current set by a single resistor ▪ 10mA to 150mA per channel ▪ ±2% current matching by channel (IOUTx >30mA) ▪ ±3.5% current accuracy by device (IOUTx >30mA) ▪ Combined multiple channels or ICs for higher current capability with same current accuracy
• Low headroom voltage ▪ Max. dropout: 500mV at 60mA per channel ▪ Max. dropout: 1.1V at 150mA per channel
• Independent PWM dimming per channel
• Analog dimming capability ▪ LED over temperature thermal roll-off ▪ LED binning
• Fault detection and protection ▪ LED string open/short ▪ Independent single LED short detection per channel ▪ Dedicated fault pin for single LED short fault ▪ Current setting resistor short ▪ Input over voltage current derating ▪ Junction over temperature thermal roll-off ▪ Thermal shutdown ▪ Shared fault flag for multiple devices operation to comply with “one-fail-all-fail” function, up to 15 devices
• Operating junction temperature range -40°C to 150°C
• AEC-Q100 qualification in progress

应用 Application

• Rear light
• Stop or taillight
• Position light
• Daytime running light
• Turn Signal Light
• Interior lighting