LP8860-Q1_16 Datasheet, PDF (1/10 Pages) Texas Instruments – Low-EMI Automotive LED Driver With Four 150-mA Channels

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LP8860-Q1
SNVSAM5 – AUGUST 2016
LP8860-Q1 Low-EMI Automotive LED Driver With Four 150-mA Channels
1 Features
•1 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 3 V to 48 V
• Four High-Precision Current Sinks
– Current Matching 0.5% (typical)
– LED String Current up to 150 mA per Channel
– Dimming Ratio >13 000:1 With External PWM
Brightness Control
– 16-bit Dimming Control with SPI or I²C
– 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 100 kHz to 2.2 MHz 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
VIN
3...40 V
RISENSE
Simplified Schematic
Q2
CIN
L
C2x
D _{Up to 48V}
COUT
VDD 3.3V
CCPUMP
CVDD
BOOST SYNC
V/H SYNC
BRIGHTNESS
FAULT RESET
EN
FAULT
VDDIO
C1P
SD
VSENSE_N
VSENSE_P
C1N
GD
ISENSE
VDD
CPUMP
ISENSE_GND
FB
FILTER
SQW
SYNC ^LP8860-Q1
VSYNC
PWM
SCLK/SCL
MOSI/SDA
MISO
OUT1
OUT2
OUT3
OUT4
NSS
VDDIO/EN
IF
TSENSE
ISET
FAULT
SGND PGND LGND PAD
Q1
RSENSE
Up to 150 mA/string
RISET
RT°
NTC
Copyright © 2016, Texas Instruments Incorporated
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 I²C 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.
To request a full data sheet or other design
resources: request LP8860-Q1.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP8860-Q1
HLQFP (32)
7.00 mm × 7.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
System Efficiency
95
90
85
80
75
70
65
0
VIN = 5 V
VIN = 6 V
VIN = 8 V
VIN = 12 V
VIN = 15 V
10 20 30 40 50 60 70 80 90 100
Brightness (%)
C001
1
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.