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.