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reference designLP8867-Q1 | Demoboard LP8867Q1EVM

Texas Instruments LP8867-Q1 | Demoboard LP8867Q1EVM

Highly-integrated 4-channel 120-mA automotive LED driver with power line FET protection

Overview

TopologyOther Topology
Input voltage4.5-40 V
Switching frequency300-2200 kHz
Output 145 V / 0.12 A
Output 245 V / 0.12 A
Output 345 V / 0.12 A
Output 445 V / 0.12 A

Description

The LP8867-Q1, LP8869-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 wide-range adjustable frequency allows the LP886x-Q1 to avoid disturbance for sensitive frequency band.The input voltage range for the LP886x-Q1 is from 4.5 V to 40 V to support automotive start-stop and load dump condition. The LP886x-Q1 integrates extensive fault detection features.

Features

  • AEC-Q100 Qualified for automotive applications:
  • Device temperature grade 1: –40°C to +125°C, TA
  • Functional safety capable
  • Documentation available to aid functional -safety system design
  • 3-, 4-Channel 120-mA current sinks
  • 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
  • Fault detection and protection
  • Fault output
  • Input voltage OVP, UVLO and OCP
  • Boost block SW OVP and output OVP
  • LED open and short fault detection
  • Power-Line FET control for battery bus protection
  • Automatic LED current reduction with external temperature sensor
  • Thermal shutdown

Typical applications

  • Backlight for: Automotive infotainment, Automotive instrument clusters, Smart mirrors, Heads-up displays (HUD)

More information

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesWinding StyleNumber of windingsL1
(µH)		Z
(Ω)		IR
(mA)		RDC max.
(Ω)		VR
(V)		 Samples
744273801SPEC
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 Active i| Production is active. Expected lifetime: >10 years.WE-SL5 HC SMT Common Mode Line Filter sectional 2 9 800 3500 0.011 80
Order Code Data­sheet Simu­lation
744273801SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesWinding StyleNumber of windingsL1
(µH)		Z
(Ω)		IR
(mA)		RDC max.
(Ω)		VR
(V)		 Samples