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