LP8863-Q1 Datasheet, PDF (1/9 Pages) Texas Instruments – Automotive Display LED-Backlight Driver With Six 150-mA Channels

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LP8863-Q1
SNVSAV5 – MARCH 2017
LP8863-Q1 Automotive Display LED-Backlight Driver With Six 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
• Six High-Precision Current Sinks
– Current Matching 1% (typical)
– Dimming Ratio 32 000:1 Using 152-Hz LED
Output PWM Frequency
– Up to 16-bit LED Dimming Resolution With
SPI, I2C, or PWM Input
– Automatically Detects Used LED Strings and
Adjusts LED-Channel Phase Shift
– Independent Current Control for Each Channel
• Hybrid PWM and Current Dimming Function
• Up to 47-V V_OUT Boost or SEPIC DC-DC
Controller
– Switching Frequency 300 kHz to 2.2 MHz
– Boost Spread Spectrum for Reduced EMI
– Boost Sync Input to Set Boost Switching
Frequency From an External Clock
– Integrated Charge Pump Supports Low V_IN
Conditions Such as Cold Crank
– Output Voltage Automatically Discharged
When Boost is Disabled
• Extensive Fault Diagnostics
Simplified Schematic
VIN
RISENSE
Q2
L1
D1
VOUT
RSD
CIN
COUT
CPUMP
CPUMP
CPUMP
RFB1
GD
Q1
GD
C1N
C2x
ISNS
PGND
PGND
RSENSE
RFB2
VDD
C1P
CVDD
VDD
ISNSGND
FB
DISCHARGE
VLDO
GND
CLDO
VDDIO
IFSEL
EN
INT
LP8863-Q1
LED0
LED1
LED2
LED3
SDO_PWM
LED4
SDI_SDA
SCLK_SCL
SS_ADDRSEL
BST_SYNC
LED5
ISET
PWM_FSET
BST_FSET
RISET
RPWM_FSET
RBST_FSET
Copyright © 2017, Texas Instruments Incorporated
1
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 LP8863-Q1 is an automotive high-efficiency LED
driver with boost controller. The six high-precision
current sinks support phase shifting that is
automatically adjusted based on the number of
channels in use. Current sink brightness can be
controlled individually and globally through the SPI or
I2C interface; brightness can also be globally
controlled with 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 voltage to the lowest
sufficient level in all conditions. A wide-range
adjustable frequency allows the LP8863-Q1 to avoid
disturbance for AM radio band.
The LP8863-Q1 supports built-in hybrid PWM and
current dimming, which reduces EMI, extends the
LED lifetime, and increases the total optical
efficiency. To request a full data sheet or other design
resources, request LP8863-Q1.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP8863-Q1
HTSSOP (38)
9.70 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
System Efficiency
95
90
85
80
V_OUT = 29 V
V_OUT = 36 V
V_OUT = 42 V
V_OUT = 46 V
75
0 10 20 30 40 50 60 70 80 90 100
Brightness (%)
D007
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.