1 Features

1• AEC-Q100 Qualified for automotive applications:

– Device temperature grade 1:

–40°C to +125°C, TA

• 3-, 4-Channel 120-mA LED driver for automotive

LCD display

– High dimming ratio of 10 000:1 at 100 Hz

– Current matching 1% (typical)

– LED String current up to 120 mA per channel

– Outputs can be combined externally for higher

current per string

• Integrated boost and SEPIC converter for LED

string power

– Input voltage operating range 4.5 V to 40 V

– Output voltage up to 45 V

– Integrated 3.3-A Switch FET

– Switching frequency 300 kHz to 2.2 MHz

– Switching synchronization input

– Spread spectrum for lower EMI

• Protection and fault detection

– Fault output

– Input voltage OVP, UVLO

– Boost OVP

– SW OVP

– LED Open and short fault detection

– Thermal shutdown

2 Applications

• Backlight for:

– Automotive infotainment

– Automotive instrument clusters

– Smart mirrors

– Heads-up displays (HUD)

3 Description

The LP8867C-Q1, LP8869C-Q1 is an automotive

highly-integrated, low-EMI, easy-to-use LED driver

with DC-DC converter. The DC-DC converter

supports both boost and SEPIC mode operation. The

device has four or three high-precision current sinks

that can be combined for higher current capability.

The DC-DC converter has adaptive output voltage

control based on the LED forward voltages. This

feature minimizes the power consumption by

adjusting the voltage to the lowest sufficient level in

all conditions. For EMI reduction DC-DC supports

spread spectrum for switching frequency and an

external synchronization with dedicated pin. A widerange

adjustable frequency allows the LP886xC-Q1

to avoid disturbance for sensitive frequency band.

The input voltage range for the LP886xC-Q1 is from

4.5 V to 40 V to support automotive stop, start and

load dump condition. The LP886xC-Q1 integrates

extensive fault detection features.