LP8862-Q1 Datasheet, PDF (1/37 Pages) Texas Instruments – High-Performance 2-Channel LED Driver

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LP8862-Q1
SNVSA75A – NOVEMBER 2015 – REVISED NOVEMBER 2015
LP8862-Q1 High-Performance 2-Channel LED Driver for Automotive Lighting
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 Range
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C4B
• Input Voltage Operating Range 4.5 V to 40 V
• Two High-Precision Current Sinks
– Current Matching 1% (Typical)
– Output Current up to 160 mA/Channel
– Dimming Ratio 10 000:1 at 200 Hz
• Integrated DC-DC for LED String Power
– Boost and SEPIC Modes Supported
– Output Voltage up to 45 V
– Switching Frequency 300 kHz to 2.2 MHz
• EMI Minimization With Optional DC-DC
Synchronization Input or Spread Spectrum
• Power-Line FET Control for Inrush Current
Protection and Standby Energy Saving
• Extensive Fault Detection Features
– Fault Output
– Input Voltage OVP, UVLO, and OCP
– Open and Shorted LED Fault Detection
– Thermal Shutdown
• Minimum Number of External Components
2 Applications
Automotive Infotainment, Instrument Cluster and
Backlighting Systems
3 Description
The LP8862-Q1 is an automotive high-efficiency, low-
EMI, easy-to-use LED driver with integrated DC-DC
converter. The DC-DC supports both boost and
SEPIC modes of operation. The device has two high-
precision current sinks that can provide high dimming
ratio brightness control with a PWM input signal.
The DC-DC converter has an adaptive output voltage
control based on the LED current sink headroom
voltages. This feature minimizes power consumption
by adjusting the voltage to the lowest sufficient level
in all conditions. DC-DC supports spread spectrum
for switching frequency and an external
synchronization with a dedicated pin. The high
switching frequency allows the LP8862-Q1 to avoid
disturbance for AM radio band.
The input voltage range for the LP8862-Q1 is from
4.5 V to 40 V to support automotive stop/start and
load dump conditions. The device supports PWM
brightness dimming ratio 10 000:1 for 200-Hz input
PWM frequency. The LP8862-Q1 integrates
extensive fault detection features. The device has an
option to drive an external p-FET to disconnect the
input supply from the system in the event of a fault.
This feature also reduces inrush current and standby
power consumption.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP8862-Q1
HTSSOP (20)
6.50 mm x 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN
4.5...40 V
RISENSE
Simplified Schematic
Q1
L1
D1 VOUT up to 45 V
CIN BOOST
RGS
CIN
CLDO
RFSET
SD
VSENSE_N
VIN
SW
FB
LDO
LP8862-Q1 ^OUT1
FSET
BRIGHTNESS
SYNC
PWM
OUT2
EN
FAULT
VDDIO
VDDIO/EN
FAULT
PGND
GND
ISET
PAD
COUT
R2
R1
CFB
Up to 160 mA/string
RISET
System Efficiency
95
90
85
80
75
70
65
60
VIN=5V
VIN=8V
55
VIN=12V
VIN=16V
50
0 10 20 30 40 50 60 70 80 90 100
Brightness (%)
D001
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.