LP8556 datasheet(1/63 Pages) TI1

部件名	LP8556

功能描述	High-Efficiency LED Backlight Driver for Tablets

PDF	63 Pages

Scroll/Zoom	100%

制造商	TI1 [Texas Instruments]

网页	http://www.ti.com

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1 / 63 page

VIN

LP8556

MCU

VBOOST

SW

1.1 ” 9OUT / VIN ” 15

L1

D1

VDD

CIN

COUT

LED1

LED2

LED3

LED4

LED5

LED6

GNDs

PWM

SDA

SCL

ISET

FSET

VLDO

CVLDO

RFSET

RISET

2.7V - 20V

7V ± 43V

EN / VDDIO

1.62V ± 3.6V

VOUT

Optional

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

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.

LP8556

SNVS871I – JULY 2012 – REVISED MARCH 2016

LP8556 High-Efficiency LED Backlight Driver for Tablets

1

1 Features

1

•

High-Efficiency DC–DC Boost Converter With

Integrated 0.19-

Ω Power MOSFET and Three

Switching Frequency Options: 312 kHz, 625 kHz,

and 1250 kHz

•

2.7-V to 36-V Boost Switch Input Voltage Range

Supports Multi-Cell Li-Ion Batteries

(2.7-V to 20-V VDD Input Range)

•

7-V to 43-V Boost Switch Output Voltage Range

Supports as Few as 3 WLEDs in Series Per

Channel and as Many as 12

•

Configurable Channel Count (1 to 6)

•

Up to 50 mA Per Channel

•

PWM and / or I2C Brightness Control

•

Phase-Shift PWM Mode Reduces Audible Noise

•

Adaptive Dimming for Higher LED Drive Optical

Efficiency

•

Programmable Edge-Rate Control and Spread

Spectrum Scheme Minimize Switching Noise and

Improve EMI Performance

•

LED Fault (Short and Open) Detection, UVLO,

TSD, OCP, and OVP (Up to 6 Threshold Options)

•

Available in Tiny 20-Pin, 0.4-mm Pitch DSBGA

Package and 24-Pin, 0.5-mm Pitch WQFN

Package

2 Applications

LED Backlights for Tablet LCDs

Simplified Schematic

3 Description

The LP8556 device is a white-LED driver featuring an

asynchronous boost converter and six high precision

current sinks that can be controlled by a PWM signal

or an I2C master.

The boost converter uses adaptive output voltage

control for setting the optimal LED driver voltages as

low as 7 V and as high as 43 V. This feature

minimizes the power consumption by adjusting the

output voltage to the lowest sufficient level under all

conditions. The converter can operate at three

switching frequencies: 312 kHz, 625 kHz, and 1250

kHz, which can be set with an external resistor or

pre-configured via EPROM. Programmable slew rate

control

and

spread

spectrum

scheme

minimize

switching noise and improve EMI performance.

LED current sinks can be set with the PWM dimming

resolution of up to 15 bits. Proprietary adaptive

dimming mode allows higher system power saving. In

addition, phase shifted LED PWM dimming allows

reduced audible noise and smaller boost output

capacitors.

The LP8556 device has a full set of fault-protection

features that ensure robust operation of the device

and external components. The set consists of input

undervoltage

lockout

(UVLO),

thermal

shutdown

(TSD), overcurrent protection (OCP), up to 6 levels of

overvoltage protection (OVP), LED open and short

detection.

The LP8556 device operates over the ambient

temperature range of –30°C to +85°C. It is available

in space-saving 20-pin DSBGA and 24-pad WQFN

packages.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE

LP8556

DSBGA (20)

2.401 mm × 1.74 mm (MAX)

WQFN (24)

4.00 mm × 4.00 mm (NOM)

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

类似零件编号 - LP8556

制造商	部件名	数据表	功能描述
Texas Instruments	LP8556	1Mb / 52P	High-Efficiency LED Backlight Driver for Tablets
	LP8556	1Mb / 67P	LP8556 High-Efficiency LED Backlight Driver For Tablets REVISED JUNE 2020
	LP8556SQ-E00/NOPB	1Mb / 52P	High-Efficiency LED Backlight Driver for Tablets
	LP8556SQ-E00/NOPB	1Mb / 67P	LP8556 High-Efficiency LED Backlight Driver For Tablets REVISED JUNE 2020
	LP8556SQ-E00/NOPB.A	1Mb / 67P	LP8556 High-Efficiency LED Backlight Driver For Tablets REVISED JUNE 2020

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