The TPS7H2221EVM is the Evaluation Module (EVM) for the TPS7H2221-SEP load switch and provides a platform to electrically evaluate its features. This user’s guide provides details about the EVM, including its configuration, schematics, and BOM. Test results that were collected using the EVM are also shown.
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The TPS7H2221-SEP device is a small, single channel load switch with controlled slew rate. The device contains an N-channel MOSFET that can operate over an input voltage range of 1.6 V to 5.5 V and can support a maximum continuous current of 1.25 A. The switch ON state is controlled by a digital input that is capable of interfacing directly with low-voltage control signals. When power is first applied, a Smart Pull Down is used to keep the ON pin from floating until system sequencing is complete. Once the pin is deliberately driven HIGH (>VIH), the Smart Pull Down will be disconnected to prevent unnecessary power loss. The TPS7H2221-SEP load switch is also self-protected, meaning that it protects against short circuit events on the output of the device.
The EVM is designed to be used across the entire input voltage and output current range of the TPS7H2221-SEP while providing flexibility to configure the device to operate under different conditions. By default, the EVM is configured for parallel-device operation, as summarized in Table 1-1, but the board also allows the parallel circuit to be seperated into 2 independent single-device circuits and provides footprints that can be populated with additional passive components to allow for testing of customized designs.
More detailed information about the default EVM configuration can be found in the Parallel Configuration Schematic and the Parallel Configuration Bill of Materials.
| Specification | Value | Description |
|---|---|---|
| Input Voltage (VIN) | 3.3 V | Falls within the recommended device input voltage range of 1.6 V to 5.5 V. |
| Output Current (IOUT) | 0 to 2.5 A | Does not exceed maximum device continuous switch current of 1.25 A per device. |
ON pin Input High (VIH,ON) | 1 to 5.5 V | High and Low inputs to the ON pin. ON1 and ON2 tied together by R17. |
ON pin Input Low (VIH,ON) | 0 to 0.35 V | |
| Output Discharge Time (tFALL) | ~0.22 ms | Typical output discharge time. Set by:
|