Features

• AEC-Q100 qualified

• General

– ST SPI communication v4.1

– 5.5 to 24 V Operating battery voltage range

– Load dump protected

– QFN40L 6x6 (wettable flanks) with

exposed pad

– Timeout watchdog and limp home function

– Low standby current

• Buck section

– Integrated switching mosfets

– Lossless current sensing without need of

external components

– Very accurate LED current setting

programming inductor's peak current and

peak-to-peak current ripple

– Adjustable peak current by SPI

– Adjustable current ripple by SPI

– Integrated PWM generation unit with 10-bit

resolution and phase shift

– Peak current control

– Constant VLED x TOFF architecture

• Protection and diagnostic

– Battery under voltage

– Temperature warning (2 thresholds)

– Overtemperature shutdown

– LED voltage digital feedback through SPI

– Buck outputs short circuit and open load

protection

Description

The L99LD20 is a flexible LED driver, which is specifically designed for the control of two independent high brightness LED strings for automotive front lighting applications. It consists of a high efficiency monolithic dual buck converter.

The buck converters integrate n-channel MOSFET which is driven by a bootstrap circuit.

When more than two LED channels are required on one module, then more devices L99LD20 can be combined also with L99LD21 device – incorporating Boost Controller - from which L99LD20 derivate.

Applications

• Low Beam

• High beam

• Daytime running light

• Turn indicator

• Position light

• Side marker

• Fog light