●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.
● 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)
