LP8866S-Q1_V01 datasheet(31/82 Pages) TI

Part #	LP8866S-Q1

Description	LP8866S-Q1 Automotive Display LED-backlight Driver with Six 150-mA Channels

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Manufacturer	TI [Texas Instruments]

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L

FB

VSENSE_P

VDD

ISNSGND

VIN

COUT

ISNS

GD

CIN

VSENSE_N

SD

PGND

VOUT

3 to 48V

SGND

3.3V/5V

UVLO

R4

R5

Figure 7-16. VIN UVLO Setting Circuit

The following equation is used to calculate the UVLO threshold for VIN rising edge:

)

4

UVLO_RISING

UVLO_TH

5

R

VIN

= (

1

VIN

R

u

(16)

where

• VINUVLO_TH = 0.787 V

The hysteresis of UVLO threshold can be designed and calculated with the following equation.

HYST

4

UVLO

VIN

=

I

R u

(17)

where

• IUVLO = 5 µA

So the following equation can be used for UVLO threshold for VIN falling edge:

UVLO_FALLING

UVLO_RISING

HYST

VIN

= VIN

-VIN

(18)

The bottom resistors, R5 of voltage divider is able to be disconnected to the GND through an additional external

N-type of FET as Figure 7-17. This design is to minimize the current leakage from VIN in shutdown mode to

extend the battery life.

www.ti.com

LP8866S-Q1

SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021

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LP8866S-Q1 Datasheet(PDF) 31 Page - Texas Instruments

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