LP5868集成電路（IC）的LED驅(qū)動(dòng)器規(guī)格書(shū)PDF中文資料

LP5868屬于集成電路（IC）的LED驅(qū)動(dòng)器。由德州儀器制造生產(chǎn)的LP5868LED 驅(qū)動(dòng)器器件屬于 LED 驅(qū)動(dòng)器電源管理集成電路 (PMIC) 系列，可通過(guò)標(biāo)稱固定電壓的電源為負(fù)載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調(diào)節(jié)的類似產(chǎn)品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通常可對(duì)器件工作點(diǎn)進(jìn)行外部控制，可在照明應(yīng)用中用于實(shí)現(xiàn)調(diào)光功能。

1 Features

? LED matrix topology:

– 6 constant current sinks with 7 scan switches

for 42 LED dots

– Configurable for 1 to 7 scan switches

? Operating voltage range:

– VCC/VLED range: 2.7V to 5.5V

– Logic pins compatible with 1.8V, 3.3V, and 5V

? 6 constant current sinks with high precision:

– 0.1mA-50mA per current sink when VCC ≥ 3.3V

– Device-to-device error: ±3% when channel

current = 50mA

– Channel-to-channel error: ±3% when channle

current = 50mA

– Phase-shift for balanced transient power

? Ultra-low power consumption:

– Shutdown mode: ICC ≤ 1μA when EN = Low

– Standby mode: ICC ≤ 10μA when EN = High

and CHIP_EN = 0 (data retained)

– Active mode: ICC = 4.2mA (typ.) when channel

current = 5mA

? Flexible dimming options:

– Individual ON/OFF control for each LED dot

– Analog dimming (current gain control)

? Global 7-step Maximum Current (MC)

setting for all LED dots

? 3 groups of 7-bit Color Current (CC) RGB

setting

? Individual 8-bit Dot Current (DC) setting for

each LED dot

– PWM dimming with audible-noise-free

frequency

? Global 8-bit PWM dimming for all LED dots

? 3 programmable groups of 8-bit PWM

dimming for LED dot arbitrary mapping

? Individual 8-bit or 16-bit PWM dimming for

each LED dot

? Full addressable SRAM to minimize data traffic

? Individual LED dot open/short detection

? De-ghosting and low brightness compensation

? Interface options:

– 1MHz (max.) I2C interface when IFS = Low

– 12MHz (max.) SPI interface when IFS = High

2 Applications

? LED animation and indication for:

– Portable electronics

– Wearables

– Internet-of-Things (IOT)

3 Description

Electronic devices are becoming smarter, requiring

to use larger quantity of LEDs for animation and

indication purposes and high performance LED matrix

driver is required to improve user experience with

small solution size.

The LP5867 is a high performance LED matrix

drivers. The devices integrate 6 constant current sinks

with N (N = 7) switching MOSFETs to support N × 6

LED dots or N × 2 RGB LEDs. The LP5867 integrates

7 MOSFETs for up to 42 LED dots or 14 RGB LEDs.

The LP5867 supports both analog dimming and

PWM dimming methods. For analog dimming, each

LED dot can be adjusted with 256 steps. For PWM

dimming, the integrated 8-bit or 16-bit configurable

PWM generators enable smooth and audible-noisefree

dimming control. Each LED dot can also be

arbitrarily mapped into 8-bit Group PWM to achieve

dimming control together.

The LP5867 device implements full addressable

SRAM to minimize the data traffic. The ghostcancellation

circuitry is integrated to eliminate both

upside and downside ghosting. The LP5867 also

supports LED open and short detection functions.

Both 1MHz (maximum) I2C and 12MHz (maximum)

SPI are available in LP5867.