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LP8867-Q1 PDF预览

LP8867-Q1

更新时间: 2024-11-16 11:11:15
品牌 Logo 应用领域
德州仪器 - TI 驱动驱动器
页数 文件大小 规格书
43页 1041K
描述
具有电力线 FET 保护的高集成度 4 通道 120mA 汽车类 LED 驱动器

LP8867-Q1 数据手册

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LP8867-Q1, LP8869-Q1  
SNVSB83B JUNE 2019REVISED 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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