1 Features

1• Qualified for Automotive Applications

• AECQ100 Qualified With the Following Results:

– Device Temperature Grade 1: –40°C to

+125°C Ambient Operating Temperature

• Input Voltage Operating Range 4.5 V to 40 V

• Four High-Precision Current Sinks

– Current Matching 1% (Typical)

– LED String Current up to 100 mA/Channel

– Dimming Ratio of 10 000:1 at 100 Hz

• Integrated Boost/SEPIC Converter for LED String

Power

– Output Voltage up to 45 V

– Switching Frequency 300 kHz to 2.2 MHz

– Switching Synchronization Input

– Spread Spectrum for Lower EMI

• Power-Line FET Control for Inrush Current

Protection and Standby Energy Saving

• Extensive Fault Detection and Tolerance Features

– Fault Output

– Input Voltage OVP, UVLO, and OCP

– Open and Shorted LED Fault Detection

– Automatic LED Current Reduction With

External Temperature Sensor

– Thermal Shutdown

• Minimum Number of External Components

2 Applications

• Backlight for:

– Automotive Infotainment

– Automotive Instrument Clusters

– Smart Mirrors

– Heads-Up Displays (HUD)

– Central Information Displays (CID)

– Audio-Video Navigation (AVN)

3 Description

The LP8861-Q1 is an automotive high-efficiency, low-

EMI, easy-to-use LED driver with integrated

boost/SEPIC converter. It has four high-precision

current sinks that can provide high dimming ratio

brightness control with a PWM input signal.

The boost/SEPIC converter has adaptive output

voltage control based on the LED current sink

headroom voltages. This feature minimizes the power

consumption by adjusting the voltage to lowest

sufficient level in all conditions. The boost/SEPIC

converter supports spread spectrum for switching

frequency and an external synchronization with

dedicated pin. A wide-range adjustable frequency

allows the LP8861-Q1 to avoid disturbance for AM

radio band.

The LP8861-Q1 has an option to drive an external p-

FET to disconnect the input supply from the system in

the event of a fault and reduce inrush current and

standby power consumption. The device can reduce

LED current based on temperature measured with

external NTC sensor to protect LED from overheating

and extend LED lifetime.

The input voltage range for the LP8861-Q1 is from

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

load dump condition. The LP8861-Q1 integrates

extensive fault detection and protection features.