Automotive LED driver can be boost, buck-boost or sepic

Diagram note: the single LED represents a series string of LEDs.

Output regulation is based on an average current mode loop. “The special [loop] amplifier follows the design formula to combine the Ton and Toff information which are forced to be equal potential through system negative feedback,” according to the firm. Average (un-dimmed) output current is 150mV/Rcs. 150mV is the internal reference).

Max output current depends on the external mosfet selected – the data sheet does not specify gate drive current or mosfet, but does specify gate drive rise time (40ns typ, 14V supply) with a load of 1nF. One application hinted at in the data sheet (its figure 1) drives an eight LED string (~24V) at 600mA from a 12V rail.

Switching can be adjusted across 70kHz to 700kHz by Rt, and this is jittered to spread its spectrum to reduce EMI.

The device has a dimming pin to control output current, which can be moved from 0 to 100% using 0-1.6V dc for analogue dimming, or 0-100% PWM (0 to >2.5V swing) for digital dimming.
This pin also has a permanent 10μA source current for control by a resistor to 0V, such as an NTC thermistor.

An open-drain fault flag pin is available. Protections include: input under-voltage, output over-voltage, output short-circuit

Qualification is to AEC-Q100 across -40°C to 125°C, with H2 human body model ESD classification and device CDM ESD classification level C6.

Packaging is MSOP-10EP ( package and AEC-Q100 qualified.