Overview
The LP8867C-Q1 is a highly integrated, low-EMI LED driver designed for automotive applications, particularly for backlighting in infotainment systems, instrument clusters, smart mirrors, and heads-up displays (HUD). This device, produced by Texas Instruments, features a DC-DC converter that supports both boost and SEPIC modes, making it versatile for various LED string configurations. It includes 4 high-precision current sinks, each capable of driving up to 120 mA of LED current. The device is AEC-Q100 qualified, ensuring it meets stringent automotive standards, and operates over a wide temperature range from -40°C to +125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of LED Channels | 4 | - |
| LED Current per Channel | Up to 120 mA | mA |
| Input Voltage Range | 4.5 V to 40 V | V |
| Output Voltage Range | Up to 45 V | V |
| Switching Frequency Range | 300 kHz to 2.2 MHz | kHz/MHz |
| Package Type | 20-Pin HTSSOP with Exposed Thermal Pad | - |
| Body Size | 6.50 mm × 4.40 mm | mm |
| Temperature Range | -40°C to +125°C | °C |
| Dimming Ratio | Up to 10,000:1 at 100 Hz | - |
| Current Matching | 1% (typical) | % |
Key Features
- AEC-Q100 Qualified: Meets automotive standards for reliability and performance.
- High-Precision Current Sinks: 4 channels with up to 120 mA per channel, and the ability to combine outputs for higher current.
- Integrated DC-DC Converter: Supports both boost and SEPIC modes with adaptive output voltage control.
- Low EMI: Features spread spectrum and external synchronization to reduce EMI noise.
- Extensive Fault Detection: Includes LED open and short detection, input voltage OVP and UVLO, boost OVP, SW OVP, and thermal shutdown.
- PWM Dimming Control: Supports PWM dimming with a frequency range from 100 Hz to 20 kHz.
- Internal LDO: Enables direct connection to the battery without the need for a pre-regulated supply.
Applications
- Automotive Infotainment Systems: Backlighting for displays in infotainment systems.
- Automotive Instrument Clusters: Backlighting for instrument cluster displays.
- Smart Mirrors: Backlighting for smart mirror displays.
- Heads-Up Displays (HUD): Backlighting for HUD systems.
Q & A
- What is the operating temperature range of the LP8867C-Q1?
The LP8867C-Q1 operates over a temperature range from -40°C to +125°C.
- How many LED channels does the LP8867C-Q1 have?
The LP8867C-Q1 has 4 LED channels.
- What is the maximum LED current per channel?
The maximum LED current per channel is up to 120 mA.
- What is the input voltage range of the LP8867C-Q1?
The input voltage range is from 4.5 V to 40 V.
- What are the switching frequency options for the DC-DC converter?
The switching frequency can be set between 300 kHz and 2.2 MHz.
- Does the LP8867C-Q1 support external synchronization for EMI reduction?
- What is the dimming ratio of the LP8867C-Q1 at 100 Hz?
The dimming ratio is up to 10,000:1 at 100 Hz.
- What kind of fault detection does the LP8867C-Q1 include?
The device includes LED open and short detection, input voltage OVP and UVLO, boost OVP, SW OVP, and thermal shutdown.
- How is the brightness controlled in the LP8867C-Q1?
Brightness is controlled using PWM dimming with a frequency range from 100 Hz to 20 kHz.
- What package type is the LP8867C-Q1 available in?
The LP8867C-Q1 is available in a 20-Pin HTSSOP package with an exposed thermal pad.
