TPS22946
- 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)
- 6000-V Human-Body Model
- Tiny DSGBA Package 1.4 mm × 0.9 mm (YZP)
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.
技术文档
| 类型 | 标题 | 下载最新的英语版本 | 日期 | |||
|---|---|---|---|---|---|---|
| * | 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 (Rev. B) | PDF | HTML | 2015年 4月 8日 | ||
| 应用手册 | Load Switch Thermal Considerations (Rev. A) | 2018年 10月 11日 | ||||
| 应用手册 | Basics of Load Switches (Rev. A) | 2018年 9月 5日 | ||||
| 选择指南 | 电源管理指南 2018 (Rev. K) | 2018年 7月 31日 | ||||
| 选择指南 | 电源管理指南 2018 (Rev. R) | 2018年 6月 25日 | ||||
| 应用手册 | Basics of eFuses (Rev. A) | 2018年 4月 5日 | ||||
| 技术文章 | How to use load switches to power your wearable | PDF | HTML | 2015年 10月 19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？ | 最新英语版本 (Rev.A) | 2014年 8月 11日 | |||
| EVM 用户指南 | Using the TPS22946EVM-499 Single Channel Load Switch IC | 2013年 2月 26日 |
设计和开发
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TPS22946EVM-499 — TPS22946 限流负载开关评估模块
借助 TPS22946EVM-499 评估模块 (EVM)，用户能够将电源连接到采用超小型 CSP-6 封装的 TPS22946 负载开关并对其进行控制。可轻松地对导通电阻、压摆率和限流属性等参数进行评估。
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| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| DSBGA (YZP) | 6 | Ultra Librarian |
订购和质量
- RoHS
- REACH
- 器件标识
- 引脚镀层/焊球材料
- MSL 等级/回流焊峰值温度
- MTBF/时基故障估算
- 材料成分
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- 持续可靠性监测
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- 封装厂地点
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