Test: Dropout Voltage vs. Output Current

1.

Configure the specified test equipment as shown in Figure 6.

2.

Enable dual LDO by setting JP1 and JP3 to the ‘ON’ position, as shown in Figure 2. Connect both inputs

of UUT to V

3.

Set the output current to 1mA, and measure the output voltage.

4.

Calculate the nominal output voltage as 98% of the output voltage at 1mA output current.

5.

Reduce the input voltage until the output voltage drops to the nominal voltage.

6.

Record the dropout voltage between the input and the output pins (as close to the pins as possible).

7.

Repeat step #5 and step #6 for different output current levels.

Figure 6: AAT3244 Evaluation Board Connection Diagram for Dropout Voltage vs. Output Current.

EV-137

AAT3244 EVAL: 300mA Adjustable Dual

CMOS Low Voltage LDO Linear Regulator

EV-137.2007.08.1.0

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