Datasheet > RT8555

RT8555

更新时间： 2024-04-09 19:00:50

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
26页	490K
描述
36V High Efficiency Boost Converter with I2C Controlled 6-CH LED Driver

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RT8555 数据手册

RT8555

36V High Efficiency Boost Converter with I²C Controlled

6-CH LED Driver

General Description

Features

^Wide Operating Input Voltage : 2.7V to 24V

^High Output Voltage : Up to 36V

^Programmable Channel Current : 10mA to 35mA

^Channel Current Regulation with Accuracy 3%

and Matching 2%

The RT8555 is a high efficiency driver for white LEDs. It is

suitable for single/two cell battery input to drive LED light

bars which contains six strings in parallel and up to

10 WLEDs per string. The internal current sinks support

a maximum of 2% current mismatching for excellent

brightness uniformity in each string of LEDs. To provide

enough headroom for current sink operation, the Boost

controller monitors the minimum voltage of the feedback

pins and regulates an optimized output voltage for power

efficiency.

^Dimming Controls

 Direct PWM Dimming up to 20kHz and Minimum

On-Time to 400ns

 PWM to Analog Dimming up to 20kHz with 8-bit

Resolution

^I²C Programs LED Current, Switching Frequency,

The RT8555 has a wide input voltage operating range from

2.7V to 24V and contains I²C interface for controlling the

dimming mode, operating frequency and the LEDcurrent.

The internal 100mΩ, 36V power switch with current-mode

control provides over-current protection. The switching

frequency of the RT8555 is adjustable from 300kHz to

2MHz, which allows flexibility between efficiency and

component size.

Dimming Mode

 Embedded Memory by OTP

 Switching Frequency : 300kHz to 2MHz

 Protections

^LED Strings Open Detection

^Current Limit

^Programmable Over Voltage Protection

^Over-Temperature Protection

 20-Ball WL-CSP, with pitch 0.4mm Package

 RoHS Compliant and Halogen Free

The RT8555 is available in the WL-CSP-20B 1.65 x 2.05

(BSC), with pitch 0.4mm package.

Applications

 Tablet andNotebook Backlight

Ordering Information

RT8555

Package Type

WSC : WL-CSP-20B 1.65x2.05 (BSC)

Note :

Pin Configuration

Richtek products are :

(TOP VIEW)

 RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

 Suitable for use in SnPb or Pb-free soldering processes.

LX PGND SDA SCL

PWM

LX PGND

GND

VIN VOUT

FB3

Marking Information

1X : Product Code

VIN VCP GND FB2

W : Date Code

1XW

FB6 FB5 FB4 FB1

WL-CSP-20B 1.65 x 2.05 (BSC)

is a registered trademark of Richtek Technology Corporation.

DS8555-01 August 2016

www.richtek.com

12 3 4 5 6 7...26

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