TPS22946 - 5.5V，0.2A，300mΩ 可选限流负载开关

TPS22946是TI德州仪器公司的一款电压与电流限制保护产品，TPS22946是5.5V，0.2A，300mΩ 可选限流负载开关，本站介绍了TPS22946的封装应用图解、特点和优点、功能等，并给出了与TPS22946相关的TI元器件型号供参考。

TPS22946 - 5.5V，0.2A，300mΩ 可选限流负载开关 - 电压与电流限制保护 - 集成负载开关 - 德州仪器

产品特性

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)

产品应用

Fingerprint Module Protection
Portable Consumer Electronics
Mobile Phones
Smartphones
Notebooks
GPS Devices

产品说明

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 5.5V. 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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
TPS22946	DSBGA (6)	0.90 mm × 1.40 mm

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