LP8553TLXSLASHNOPB.A中文资料德州仪器数据手册PDF规格书

1FEATURES

2• High-Voltage DC/DC Boost Converter with

Integrated FET with Four Switching Frequency

Options: 156/312/625/1250 kHz

• 2.7V to 22V Input Voltage Range to Support

1x…5x Cell Li-Ion Batteries

• Programmable PWM Resolution

– 8 to 13 True Bit (Steady State)

– Additional 1 to 3 Bits Using Dithering

During Brightness Changes

• I2C and PWM Brightness Control

• Automatic PWM & Current Dimming for

Improved Efficiency

• PWM Output Frequency and LED Current Set

Through Resistors

• Optional Synchronization to Display VSYNC

Signal

• 4 LED Outputs with LED Fault (Short/Open)

Detection

• Low Input Voltage, Over-Temperature, Over-

Current Detection and Shutdown

• Minimum Number of External Components

• DSBGA 25-Bump Package, 2.466 x 2.466 x

0.6 mm

APPLICATIONS

• Notebook and Netbook LCD Display LED

Backlight

• LED Lighting

DESCRIPTION

The LP8553 is a white LED driver with integrated

boost converter. It has four adjustable current sinks which can be controlled by PWM input or with I2C-

compatible serial interface.

The boost converter has adaptive output-voltage control based on the LED driver voltages. This

feature minimizes the power consumption by

adjusting the voltage to lowest sufficient level in all

conditions.

LED outputs have 8-bit current resolution and up to

13-bit PWM resolution with additional 1-3 bit dithering

to achieve smooth and precise brightness control.

Proprietary Phase Shift PWM control is used for LED outputs to reduce peak current from the boost

converter, thus making the boost capacitors smaller.

The Phase Shifting scheme also eliminates audible

noise.