LP8868VQDMTRQ1中文资料德州仪器数据手册PDF规格书

1 Features

• AEC-Q100 Qualified for automotive applications:

– Temperature grade 1:

–40°C to +125°C, TA

• Integrated MOSFET for buck, buck-boost and

boost topology

– Wide input voltage: 4.5 V to 65 V

– Integrated 5.2-A and 150-mΩ MOSFET

– Switching frequency 100 kHz to 2.2 MHz

– Spread spectrum for lower EMI

• High precision power FET dimming

– Up to 4-A output current in buck topology

– Analog dimming (dimming ratio 256 :1)

– Fast PWM dimming (150-ns pulse width)

– Hybrid and flexible dimming

• 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 LP8868-Q1 family is a non-synchronous multitopology

solution with 4.5-V to 65-V wide input range.

By integrating the low-side NMOS switch, the device

is capable of driving LEDs with high power density

and high efficiency. The family also supports common

cathode connection and 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 LP8868-Q1 family supports four dimming options,

including analog, PWM, hybrid 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 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 accuracy.

The LP8868-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.