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LP8867-Q1, LP8869-Q1
SNVSB83B –JUNE 2019–REVISED JANUARY 2020
LP8867-Q1, LP8869-Q1 Low EMI Automotive LED Driver with 4-, 3- Channels
1 Features
2 Applications
1
•
AEC-Q100 Qualified for automotive applications:
•
Backlight for:
–
Device temperature grade 1:
–40°C to +125°C, TA
–
–
–
–
Automotive infotainment
Automotive instrument clusters
Smart mirrors
•
•
Functional safety capable
–
Documentation available to aid functional
safety system design
Heads-up displays (HUD)
3-, 4-Channel 120-mA current sinks
3 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.
–
–
–
–
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
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.
–
–
–
–
–
–
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
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.
•
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
Device Information(1)
PART NUMBER
LP8867-Q1
PACKAGE
BODY SIZE (NOM)
Power-Line FET control for battery bus
protection
HTSSOP (20)
6.50 mm × 4.40 mm
LP8869-Q1
–
–
Automatic LED current reduction with external
temperature sensor
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Thermal shutdown
Simplified Schematic
LED Backlight Efficiency
VIN
4.5...40 V
RISENSE
Q1
D1
L1
Up to 45 V
100
96
92
88
84
80
CIN BOOST
COUT
RGS
R2
R1
SW
SD
VSENSE_N
VIN
FB
CFB
VLDO
CIN
Up to 120 mA/string
LDO
CLDO
OUT1
LP8867-Q1
OUT2
OUT3
RFSET
76
FSET
SYNC
PWM
VLDO
R4
VIN = 16V
VIN = 12V
VIN = 8V
VIN = 6V
OUT4
72
BRIGHTNESS
R3
RTº
TSET
TSENSE
ISET
R7
EN
68
80
VDDIO/EN
FAULT
160
240 320
Output Current (mA)
400
480
FAULT
R6
D000
R5
R8
VDDIO
NTC
PGND GND
PAD
RISET
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.
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