LP2953QML, LP2953QML-SP

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SNVS395C – NOVEMBER 2010 – REVISED APRIL 2013

Figure 30. Power Derating Curve for LP2953

Programming the Output Voltage

The regulator may be pin-strapped for 5V operation using its internal resistive divider by tying the Output and

Sense pins together and also tying the Feedback and 5V Tap pins together.

Alternatively, it may be programmed for any voltage between the 1.23V reference and the 30V maximum rating

using an external pair of resistors (see Figure 31). The complete equation for the output voltage is:

(2)

recommended load current of 1

μA sets an upper limit of 1.2 MΩ on the value of R2 in cases where the regulator

room temperature by trimming R1. For better accuracy, choosing R2 = 100 k

Ω will reduce this error to 0.17%

while increasing the resistor program current to 12

μA. Since the typical quiescent current is 120 μA, this added

current is negligible.

* See Application Hints

** Drive with TTL-low to shut down

Figure 31. Adjustable Regulator

Dropout Voltage

The dropout voltage of the regulator is defined as the minimum input-to-output voltage differential required for the

output voltage to stay within 100 mV of the output voltage measured with a 1V differential. The dropout voltage is

independent of the programmed output voltage.

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