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参数

Number of channels (#) 1 Vin (Min) (V) 1.62 Vin (Max) (V) 5.5 Imax (A) 0.235 Ron (Typ) (mOhm) 400 Shutdown current (ISD) (Typ) (uA) 0.1 Quiescent current (Iq) (Typ) (uA) 1.3 Soft start Fixed Rise Time Rise time (Typ) (us) 35 Features Thermal Shutdown Operating temperature range (C) -40 to 85 open-in-new 查找其它 负载开关

封装|引脚|尺寸

DSBGA (YZP) 6 2 mm² .928 x 1.428 open-in-new 查找其它 负载开关

特性

  • Ultralow Quiescent Current 1 µA (Typical)
    at VIN = 1.8 V
  • Input Voltage Range: 1.62 V to 5.5 V
  • Low ON-Resistance
    • rON = 300 mΩ at VIN = 5.5 V
    • rON = 400 mΩ at VIN = 3.3 V
    • rON = 500 mΩ at VIN = 2.5 V
    • rON = 600 mΩ at VIN = 1.8 V
  • Selectable Minimum Current Limit:
    155 mA, 70 mA, or 30 mA
  • Integrated Inrush Current Time-out (8 ms)
  • Shutdown Current: < 1 µA
  • Thermal Shutdown
  • Fault Blanking
  • Auto Restart
  • Overcurrent Condition Time-out (Automatic
    Disable for Permanent Overcurrent)
  • 1.8-V Compatible Control Input
  • ESD Performance Tested Per JESD 22
    • 6000-V Human-Body Model
      (A114-B, Class II)
  • Tiny DSGBA Package 1.4 mm × 0.9 mm (YZP)
open-in-new 查找其它 负载开关

描述

The TPS22946 is an ultralow power load switch that provides protection to systems and loads in high-current conditions. The device contains a 300-mΩ current-limited P-channel MOSFET that can operate over an input voltage range of 1.62 V to 5.5 V. The switch is controlled by an on/off input (ON), which can interface directly with low-voltage control signals. The TPS22946 includes thermal shutdown protection that prevents damage to the device when a continuous over-current condition causes excessive heating by turning off the switch.

When the switch current reaches the maximum limit, the TPS22946 operates in a constant-current mode to prohibit excessive currents from causing damage. The current limit can be selected using the CL input: a high CL input sets the current limit to 155 mA, a low CL input sets the current limit to 70 mA, and a floating CL input sets the current limit to 30 mA.

If the constant current condition persists after 10 ms, the switch is turned off and the fault signal pin (OC) is pulled low. The TPS22946 has an auto-restart feature which turns the switch on again after 70 ms if the ON pin is still active. If the TPS22946 remains in an over-current condition for 5 seconds, the device shuts off until it is turned on again by setting the ON control signal off and then on.

If the device is used to protect an LDO, the inrush current required by the LDO at startup can, in some cases, exceed the current limit and initiate a blanking (current limiting) condition. The TPS22946 provides allowance for this scenario during startup of the LDO by temporarily increasing the current limit to 435 mA for 8 ms after the load switch is enabled.

The TPS22946 is available in space-saving 6-pin DSBGA (YZP) package. The device is characterized for operation over the free-air temperature range of –40°C to 85°C.

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技术文档

= 特色
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类型 标题 下载最新的英文版本 发布
* 数据表 TPS22946 Ultralow Power, Low Input Voltage, Current-Limited Load Switch With Shutoff, Auto-Restart, and Overcurrent Condition Time-Out 数据表 2015年 4月 8日
应用手册 Load Switch Thermal Considerations 2018年 10月 11日
选择指南 电源管理指南 2018 (Rev. K) 2018年 7月 31日
应用手册 Basics of eFuses 2018年 4月 5日
技术文章 How can a load switch extend your device’s battery life? 2018年 3月 20日
技术文章 How and why you should use load switches for power sequencing 2018年 2月 6日
技术文章 How to use load switches and eFuses in your set-top box design 2017年 11月 23日
技术文章 Don’t leave it floating! Power off your outputs with quick output discharge 2016年 12月 9日
应用手册 负载开关:什么是负载开关,为什么需要负载开关,如何选择正确的负载开关? 下载最新的英文版本 (Rev.A) 2014年 8月 11日
用户指南 Using the TPS22946EVM-499 Single Channel Load Switch IC 2013年 2月 26日

设计与开发

有关其他条款或所需资源,请点击下面的任何链接来查看详情页面。

硬件开发

评估板 下载
document-generic 用户指南
$25.00
说明
The Texas Instruments TPS22946EVM-499 evaluation module (EVM) allows the user to connect power to and control the TPS22946 ultra-small, CSP-6 package load switch. Parameters such as on state resistance, slew rate and current limit properties can be easily evaluated.
特性
  • Ultra-Low Quiescent Current 1 µA (typ) at 1.8V Input
  • Input Voltage Range: 1.62 V to 5.5 V
  • Integrated Inrush Current Timeout (8 ms)
  • Thermal Shutdown
  • Fault Blanking
  • Over-Current Condition Timeout (Automatic Disable for Permanent Over-Current)

参考设计

参考设计 下载
针对温度传感器中冷端补偿参考设计的 RTD 替代
TIDA-010019 — 使用热电偶 (TC) 的温度检测应用需要高精度本地温度传感器来实现高精度。在此参考设计中,突出显示并说明了针对诸如冷端补偿 (CJC) 或包含超低功耗 TC 模拟前端等设计难题的解决方案。对高精度 4mA 至 20mA 传感器的功耗性能和精度性能进行了优化,同时还展示了不同 CJC 和 TC 前端实现的性能。
document-generic 原理图 document-generic 用户指南 document-generic 下载英文版本 (Rev.A)
参考设计 下载
用于针对电网应用提供瞬态保护且基于平缓钳位 TVS 的参考设计
TIDA-010008 — 该参考设计采用多种方法,使用平缓钳位浪涌保护措施、ESD 器件、电子保险丝或负载开关,来保护交流或直流模拟输入、直流模拟输出、交流或直流二进制输入、带高侧或低侧驱动器的数字输出、LCD 偏置电源、USB (...)
document-generic 原理图 document-generic 用户指南 document-generic 下载英文版本 (Rev.B)

CAD/CAE 符号

封装 引脚 下载
DSBGA (YZP) 6 视图选项

订购与质量

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