Texas Instruments LP8860-Q1 Handleiding

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LP8860-Q1 Low-EMI Automotive LED Driver with Four 150mA Channels

1 Features

•Qualified for automotive applications

•AEC-Q100 qualified with the following results:

–Device temperature grade 1: –40°C to +125°C

ambient operating temperature

•Input voltage operating range 3V to 48V

•Four high-precision current sinks

–Current matching 0.5% (typical)

–LED string current up to 150mA per channel

–Dimming ratio > 13 000:1 with external PWM

brightness control

–16-bit dimming control with SPI or I

2

C

–Supports display mode (global dimming) and

cluster mode (Independent dimming)

•Hybrid PWM and current dimming for higher LED

drive optical efficiency

•Synchronization for LED PWM frequency

•Boost controller with programmable switching

frequency 100kHz to 2.2MHz and spread-

spectrum option for lower EMI

•Boost synchronization input

•Power-line FET control for inrush current

protection and standby energy Saving

•Automatic LED current reduction with external

temperature sensor

•Extensive fault diagnostics

LP8860-Q1

ISENSE

FB

SGND

PWM

OUT1

OUT2

OUT3

OUT4

L

D

Up to 48V

3...40 V

FILTER

VSYNC

C

OUT

C

IN

SD

GD

VSENSE_N

R

ISET

Up to 150 mA/string

R

SENSE

Q1

ISENSE_GND

CPUMP

C1PC1N

VDD

SYNC

VIN

C

2x

VDDIO/EN

SCLK/SCL

MOSI/SDA

MISO

NSS

PGNDLGNDPAD

IF

VSENSE_P

R

ISENSE

TSENSE

ISET

FAULT

SQW

VDDIO

R

T°

NTC

FAULT

EN

FAULT RESET

BRIGHTNESS

V/H SYNC

BOOST SYNC

VDD 3.3V

Q2

C

VDD

C

CPUMP

Copyright © 2016, Texas Instruments Incorporated

Simplified Schematic

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 LP8860-Q1 is an automotive high-efficiency LED

driver with boost controller. It has 4 high-precision

current sinks that can be controlled by a PWM input

signal, an SPI or I

2

C master, or both.

The boost converter has adaptive output voltage

control based on the headroom voltages of the

LED current sinks. This feature minimizes the

power consumption by adjusting the voltage to the

lowest sufficient level in all conditions. A wide-range

adjustable frequency allows the LP8860-Q1 to avoid

disturbance for AM radio band.

The LP8860-Q1 supports built-in hybrid PWM and

current dimming, which reduces EMI, extends the

LED lifetime, and increases the total optical efficiency.

Phase-shift PWM reduces audible noise and output

ripple.

Device Information

(1)

PART NUMBERPACKAGEBODY SIZE (NOM)

LP8860-Q1HLQFP (32)7.00mm × 7.00mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

65

70

75

80

85

90

95

0102030405060708090100

Efficiency (%)

Brightness (%)

VIN = 5 V

VIN = 6 V

VIN = 8 V

VIN = 12 V

VIN = 15 V

C001

System Efficiency

LP8860-Q1

SNVSA21H – MAY 2014 – REVISED APRIL 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Product specificaties