Overview
The LP8861-Q1, produced by Texas Instruments, is a high-efficiency, low-EMI, automotive LED driver integrated with a boost/SEPIC converter. This device is designed for ease of use and provides high-precision current control through four high-precision current sinks. It supports a wide range of automotive lighting applications, including backlighting for infotainment systems, instrument clusters, smart mirrors, heads-up displays, and central information displays. The LP8861-Q1 is notable for its adaptive output voltage control, which minimizes power consumption by adjusting the voltage to the lowest sufficient level in all conditions.
Key Specifications
| Parameter | Value |
|---|---|
| Package | HTSSOP (20 pins) |
| Body Size | 6.50 mm × 4.50 mm |
| Input Voltage Range | 4.5 V to 40 V |
| Output Channels | 4 high-precision current sinks |
| PWM Input Frequency Range | 100 Hz to 20 kHz |
| Switching Frequency | Wide-range adjustable with spread spectrum capability |
| Fault Detection | Open-string, shorted LED, VIN input overvoltage/undervoltage, VIN input overcurrent, thermal shutdown |
| Thermal Protection | Optional LED thermal protection with external NTC sensor |
Key Features
- High-efficiency boost/SEPIC converter with adaptive output voltage control to minimize power consumption.
- Four high-precision current sinks for high dimming ratio brightness control.
- PWM input signal for brightness control with output frequency matching the input frequency.
- Spread spectrum for switching frequency and external synchronization capability.
- Extensive fault detection and protection features including open-string and shorted LED detections, VIN input overvoltage/undervoltage protection, VIN input overcurrent protection, and thermal shutdown.
- Optional LED thermal protection using an external NTC sensor.
- Support for driving an external p-FET to disconnect the input supply in fault conditions.
Applications
- Backlight for automotive infotainment systems.
- Backlight for automotive instrument clusters.
- Smart mirrors.
- Heads-Up Displays (HUD).
- Central Information Displays (CID).
- Audio-Video Navigation (AVN) systems.
Q & A
- What is the input voltage range of the LP8861-Q1?
The input voltage range of the LP8861-Q1 is from 4.5 V to 40 V, supporting automotive stop/start and load dump conditions. - How many output channels does the LP8861-Q1 have?
The LP8861-Q1 has four high-precision current sinks. - What is the PWM input frequency range for the LP8861-Q1?
The PWM input frequency range is from 100 Hz to 20 kHz. - Does the LP8861-Q1 support spread spectrum for switching frequency?
Yes, the LP8861-Q1 supports spread spectrum for switching frequency and external synchronization. - What types of fault detection does the LP8861-Q1 support?
The LP8861-Q1 supports open-string and shorted LED detections, VIN input overvoltage/undervoltage protection, VIN input overcurrent protection, and thermal shutdown. - Can the LP8861-Q1 protect LEDs from overheating?
Yes, the LP8861-Q1 can reduce LED current based on temperature measured with an external NTC sensor to protect LEDs from overheating. - What is the package type and size of the LP8861-Q1?
The LP8861-Q1 comes in a HTSSOP package with 20 pins and a body size of 6.50 mm × 4.50 mm. - Can the LP8861-Q1 drive an external p-FET?
Yes, the LP8861-Q1 can drive an external p-FET to disconnect the input supply in the event of a fault. - What are some common applications of the LP8861-Q1?
Common applications include backlighting for automotive infotainment systems, instrument clusters, smart mirrors, heads-up displays, and central information displays. - How does the LP8861-Q1 minimize power consumption?
The LP8861-Q1 minimizes power consumption through its adaptive output voltage control, which adjusts the voltage to the lowest sufficient level in all conditions.
