ALT80800KLPATR

The ALT80800KLPATR from Allegro Microsystems is an automotive-grade, synchronous buck switching regulator providing a constant-current output for driving high-power LEDs. This device integrates high-side and low-side N-channel DMOS switches for efficient DC-to-DC step-down conversion, achieving true average current output through a controlled on-time method.

Key electrical specifications include a supply voltage range of 4.5 to 55 V and a maximum output current of 2.0 A. The switching frequency is 500 kHz, and it supports both PWM and analog dimming down to 0.1% at 200 Hz. An integrated 5 V, 14 mA LDO regulator is included for peripheral circuits, and the device features a low-power shutdown mode with a typical current of 1 µA.

The ALT80800KLPATR is housed in a 16-pin eTSSOP-EP package with an exposed pad for enhanced thermal dissipation, suitable for surface mounting. Its operating temperature range is -40°C to 125°C (TJ). The device is AEC-Q100 qualified, indicating its suitability for demanding automotive applications.

Applications for this LED driver include automotive lighting such as daytime running lights, front and rear fog lights, turn/stop lights, map lights, and dimmable interior lights. It offers robust protection features including cycle-by-cycle current limit, undervoltage lockout, and thermal shutdown.