Other Parts Discussed in Thread: DRV5023, DRV5033, DRV5021
DRV5032AJ includes open drain output.
What is Rdson resistance? What is current maximum value?
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
DRV5032 doesn't list Rdson in the datasheet, but the maximum recommended operating output current is 5 mA. Rdson will typically be considerably lower in value than the accompanying pull-up resistor used in this scenario. I would recommend setting the pull-up resistor so that the Iout current matches the typical 1 mA (or less) current used to produce the performance table in the datasheet.
Rdson of similar devices with this value listed (i.e. DRV5033, DRV5023, or DRV5021) range from 8 to 22 ohms.
Please provide details regarding what guidance you need regarding Rdson of this device.
The maximum output current is listed as 5 mA in the datasheet. You should not exceed this value. For low power consumption, you would want to minimize this current anyway which would require using a larger pull-up resistor. As a result, the tolerance variations in the resistor would typically be more significant than what you might expect from Rdson.
Maximum current is +/-5mA, therefore it is corresponded to push-pull output. I asked about open drain current and Rdson. If open drain of DRV5032 is similar to open drain DRV5033, then maximum sink current is 30mA as in DRV5033, but not 1mA as written in test condition of DRV5032.
So, what is maximum current of DRV5032FC open drain? Is it possible 30mA?
While +/- 5mA does imply both push-pull functionality, the difference in open drain is that the PMOS driver is not connected. So the device is only able to sink a maximum of 5 mA.
While a more precise value is not available to provide you from the datasheet, you can approximate the range of Rdson by comparing the Iout current and the Vol voltage. Here Vol is specified at 0.1 V with a maximum of 0.3 V when 1 mA is applied. The result is about 100-300 ohms.
The published Absolute Maximum sink current is 5 mA, TI cannot provide any guarantee for performance for any device to operate outside of the ABS max table in the datasheet. As such, we do not recommend you force the device to sink more than 5 mA for this device. If you wish to force it to sink more current than this is your prerogative, but doing so violates all quality or performance guarantees.
The test condition to determine the datasheet limits for Vol involves a sink current of 1 mA. The output level is measured and the device is deemed good so long as the Vol is satisfactory. As long as it is within the MAX value after accounting for test uncertainty, it would be deemed a passing unit. Statistical variation is taken into account to determine both the typical and max values here, but there may be additional tolerance added to ensure this never causes yield loss. This is why I indicated that it would be a less accurate approach, but you can be sure that Rdson does not exceed the value calculated by comparing the two parameters. Otherwise it would exceed the Vol Max specification.