LP8868VQDMTRQ1中文資料德州儀器數(shù)據(jù)手冊(cè)PDF規(guī)格書

1 Features

? AEC-Q100 qualified for automotive applications:

– temperature grade 1:

–40°C to +125°C, TA

? High precision power FET dimming

– Up to 4-A output current

– Analog dimming(dimming ratio 128:1)

– Fast PWM dimming (200-ns pulse width)

– Hybrid and flexible dimming

? Integrated MOSFET for buck, buck-boost and

boost topology

– Input voltage operating range 4.5 V to 65 V

– Integrated 4.5-A and 150-mΩ MOSFET

– Switching frequency 100 kHz to 2.2 MHz

– Spread spectrum for lower EMI

? Full protection features:

– Fault output

– LED open and short protection

– Cycle-by-cycle current limit

– Switching FET failure protection

– Thermal shutdown

– Configurable thermal foldback curve

2 Applications

? Automotive infotainment

? Automotive instrument clusters

? Heads-up displays(HUD)

? Automotive lighting

3 Description

The LP8868X-Q1 family is a non-synchronous Buck,

Boost, Buck-Boost LED driver with 4.5-V to 65-V wide

input range. By integrating the low-side NMOS switch,

the device is capable of driving LEDs as well as

charging batteries with high power density and high

efficiency. The device also supports single-layer PCB

design. The switching frequency is configurable from

100 kHz to 2.2 MHz with an optional spread spectrum

feature for better EMI performance.

The LP8868X-Q1 family supports four dimming

options, including analog dimming, PWM dimming,

hybrid dimming and flexible dimming. Each dimming

method can be configured through the PWM and

ADIM input pins by means of simple high and low

signals. The LP8868X-Q1 family adopts an adaptive

off-time current mode control along with smart and

accurate sampling to enable inductive fast dimming

(IFD) and achieve high dimming ratio.

The LP8868X-Q1 family also provides multiple

systematic protections, including LED open and short,

sense resistor open and short, configurable thermal

foldback and thermal shutdown. Fault output will

send out acknowledge signals as soon as any fault

condition is detected.