MCU

LP8553

SW

FB

VLDO

GNDs

EN

ISET

VDDIO

PWM

SCLK

SDA

OUT1

OUT2

OUT3

OUT4

L1

D1

2.7V ± 22V

FILTER

+5V input rail

FSET

15 éH

VSYNC

COUT

CIN

10 éF

4.7 éF

CVLDO

1 éF

VDDIO reference voltage

VSYNC signal

120 k

#

100 nF

RISET

1 éF

FAULT

Can be left floating

if not used

39 pF

VIN

RFSET

VBATT 5.5V ± 22V

10 ± 40V, 180 ± 400 mA

10 ± 25V, 180 mA

LP8553

SNVS701B – SEPTEMBER 2011 – REVISED JANUARY 2014

www.ti.com

DESCRIPTION (CONTINUED)

Automatic PWM dimming at lower brightness values and current dimming at higher brightness values can be

used to improve the optical efficiency.

Internal EEPROM is used for storing the configuration data. This makes it possible to have minimum external

component count and make the solution very small.

LP8553 has safety features which make it possible to detect LED outputs with open or short fault. Low input

voltage and boost over-current conditions are also monitored, and the chip is turned off when these events occur.

Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set

temperature has been reached.

LP8553 is available in TI's DSBGA 25-bump package.

Typical Application for Low Input Voltage (2)

Note: Separate 5V rail to VLDO can be also used to improve efficiency for applications with higher battery voltage. No

power sequencing requirements between VIN/VLDO and VBATT.

2

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