WMSIC Electronic Components

PCA9955BTW/Q900J PCA9955BTW

ModelPCA9955BTW/Q900J
PackageHTSSOP-28-EP
BrandNXP
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration 24+

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
NXP PCA9955BTW / Q900J
Type
NXP
Minimum package
2500 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
NXP
Electronic Component
PCA9955BTW/Q900J
Electronic Component
1
Package
HTSSOP-28-EP
Type
DC-DC
Electronic Component
LEDDriver
Electronic Component
PWM;I2C
Electronic Component
0.36g
Electronic Component
1
Channel Count
16
Features
(SCP); LED; (OTP)
Electronic Component
BM0258756407
Operating Temperature
40℃~+105℃
Switching Frequency
31.25kHz
Electronic Component
4%

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

PCA9955BTW/Q900J 产品概述

一、产品简介

PCA9955BTW/Q900J 是恩智浦(NXP)推出的一款 16 通道线性恒流 LED 驱动器 IC,适用于背光、指示灯以及灯条等多通道 LED 控制场合。器件工作电压范围为 DC 3.0V~5.5V,采用 HTSSOP-28-EP 封装,集成 I2C 接口与 PWM 调光功能,支持高精度恒流输出与多重保护机制,便于系统级设计与可靠性保证。

二、主要电气参数

  • 通道数:16 路独立输出
  • 工作电压:DC 3.0V ~ 5.5V
  • 输出恒流:典型值约 57 mA(描述中最高可达 65 mA,实际取决于封装热条件与版图设计)
  • 恒流精度:±4%
  • 开关/调光频率:31.25 kHz(用于 PWM 调光)
  • 通信接口:I2C(用于逐通道或组写寄存器、亮度控制)
  • 工作温度范围:-40℃ ~ +105℃

三、保护与可靠性特性

PCA9955BTW 集成多项保护功能,提高系统安全性与可靠性:

  • 过温保护(OTP):当芯片温度超出安全阈值时自动限制或关闭输出,防止热失控;
  • 短路保护(SCP):检测输出短路并限制电流,减少对芯片与外部线路的损害;
    这些保护配合线性驱动特性,能在苛刻工作条件下提供稳健的防护。

四、封装与热管理

器件为 HTSSOP-28-EP(带底部散热焊盘)封装,需在 PCB 设计中重视散热路径:

  • 推荐在 PCB 底部与焊盘下方布置充足的散热铜箔与过孔,增加热扩散面积;
  • 输出电流较高时(接近 57–65 mA/通道),应评估全部通道同时工作的热耗并设计合适散热方案以避免触发 OTP。

五、应用场景与设计注意事项

适用场景包括:小型显示背光、键盘/按键背光、指示灯阵列、可编程灯光装置等。设计时建议注意:

  • 电源去耦:在 VCC 近芯片位置放置低 ESR 电容,抑制瞬态;
  • I2C 总线:注意上拉电阻与总线布局,避免干扰影响通信;
  • PWM 调光:31.25 kHz 的调光频率可实现无可见闪烁的亮度控制,选择合适的占空比与分辨率以满足视觉效果与功耗需求;
  • 热限速:当通道数量多且电流接近上限时,应预留降额余量或使用分时驱动策略降低平均热负荷。

六、设计集成建议

  • 如果需更高效率或更大输出电流,考虑将线性驱动与外置开关电源结合使用(降低芯片功耗);
  • 在需要严格亮度匹配的场合,可利用 I2C 逐通道校准寄存器配合软件校正,利用 ±4% 的硬件精度做进一步优化;
  • PCB 布局上优先考虑热沉焊盘连通、输出通道走线短且对称,以保证一致的电流分布与散热效果。

小结:PCA9955BTW/Q900J 以其 16 通道、I2C 控制、PWM 调光以及多重保护特性,适合对多路 LED 进行高精度、可控且可靠的线性驱动应用。在实际工程中,合理的热设计与电源/通信布线是发挥其性能的关键。

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