Texas Instruments LP8864S-Q1 Handleiding

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LP8864S-Q1 Automotive Display LED-backlight Driver with Four 150mA Channels

1 Features

•AEC-Q100 qualified for automotive applications:

–Device temperature grade 1:

–40°C to +125°C, T

A

–Device HBM ESD classification level 2

–Device CDM ESD classification level C4B

•Input voltage operating range 3V to 48V

•Four high-precision current sinks

–Up to 150mA DC current for each current sink

–Current matching 1% (typical)

–Dimming ratio 32 000:1 using 152Hz LED

output PWM frequency

–Up to 16-bit LED dimming resolution with I2C,

or PWM input

–8 Configurable LED strings configuration

•Auto-phase shift PWM dimming

•12-bit analog dimming

•Up to 48V V

OUT

boost or SEPIC DC/DC controller

–Switching frequency 100kHz to 2.2MHz

–Boost spread spectrum for reduced EMI

–Boost sync input to set boost switching

frequency from an external clock

–Output voltage automatically discharged when

boost is disabled

•Extensive fault diagnostics

2 Applications

•Backlight for:

–Automotive infotainment

–Automotive instrument clusters

–Smart mirrors

–Heads-up displays (HUD)

3 Description

The LP8864S-Q1 is an automotive high-efficiency

LED driver with boost controller. The Four high-

precision current sinks support phase shifting that

is automatically adjusted based on the number of

channels in use. LED brightness can be controlled

globally through the I²C interface or PWM input.

The boost controller has adaptive output voltage

control based on the headroom voltages of the

LED current sinks. This feature minimizes the power

consumption by adjusting the boost voltage to the

lowest sufficient level in all conditions. A wide-range

adjustable frequency allows the LP8864S-Q1 to avoid

disturbance for AM radio band.

The LP8864S-Q1 supports built-in hybrid PWM

dimming and analog current dimming, which reduces

EMI, extends the LED lifetime, and increases the total

optical efficiency.

Device Information

PART NUMBER

(1)

PACKAGEBODY SIZE (NOM)

LP8864S-Q1

HTSSOP (38)9.70mm × 4.40mm

QFN (32)5mm × 5mm

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

the end of the data sheet.

Simplified Schematic

Brightness (%)

Boost Efficiency (%)

0102030405060708090100

75

80

85

90

95

D007

V

OUT

= 29 V

V

OUT

= 36 V

V

OUT

= 42 V

V

OUT

= 46 V

System Efficiency

LP8864S-Q1

SNVSBD3B – AUGUST 2020 – REVISED MAY 2024

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