Lumissil IS32LT3124 Linear LED Drivers

Lumissil IS32LT3124 Linear LED Drivers are programmable current regulators that consist of four output channels capable of up to 150mA each. The IS32LT3124 features individual external resistors set to the maximum current level for each channel. The outputs are combined for a higher current drive capability up to max 600mA. The IS32LT3124 features Dynamic Headroom Control (DHC) with an optional external PMOS FET. This minimizes IC thermal stress when the supply voltage exceeds the LED string forward voltage.

Features

5.0V to 28V input supply voltage range
- Withstand 42V load dump
Four output channels can source up to 150mA each
- Four current set resistors
- ±4% output current accuracy
- Low dropout voltage of 1V (max.) at 100mA
- Combined for higher current capability with the same current accuracy
PWM dimming and shutdown control input
- 100Hz~300Hz power supply modulation (PSM)
- 100Hz~1kHz individual dimming via resistors of ISETx pins (IS32LT3124B/C only)
Dynamic Headroom Control (DHC) with an optional external PMOS FET to minimize IC thermal stress
- Shunt regulator mode for heavy load
- Series regulator mode for light load

Additional external Undervoltage Lockout Threshold (UVLO) is programmable via EN pin (IS32LT3124A only)
Fault protection and reporting
- Externally enable/disable fault reporting (IS32LT3124B/C only)
- Programmable fault reporting output delay time
- Fault condition disables all output (IS32LT3124A/B only)
- Parallel fault connection (one-fail-all-fail)
- LED string open/short
- Single LED short (conditional)
- ISET pin short
- ISET pin open (IS32LT3124A only)
- Overtemperature
AEC-Q100 qualification in progress
-40°C to +125°C operating temperature range

Applications

Automotive LED drivers
RGBW automotive ambient lighting
Taillights

Turn lights
Daytime running lights

Lumissil IS32LT3124 Linear LED Drivers

Features

Applications

Typical Application Circuit

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