LM9076Q

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SNVS713B – APRIL 2011 – REVISED MARCH 2013

APPLICATION INFORMATION

REGULATOR BASICS

The LM9076Q regulator is suitable for Automotive and Industrial applications where continuous connection to a

battery supply is required (refer to the Typical Application circuit).

The pass element of the regulator is a PNP device which requires an output bypass capacitor for stability. The

minimum bypass capacitance for the output is 10

μF (refer to ESR limitations). A 22 μF, or larger, output bypass

capacitor is recommended for typical applications

INPUT CAPACITOR

The LM9076Q requires a low source impedance to maintain regulator stability because critical portions of the

inches of the LM9076Q, is adequate for a majority of applications. Additionally, and at a minimum, a 0.1

μF

possible to the LM9076Q itself .

OUTPUT CAPACITOR

pin and Ground pin, as close as is physically possible, using traces that are not part of the load current path.

The output capacitor must meet the requirements for minimum capacitance and also maintain the appropriate

ESR value across the entire operating ambient temperature range. There is no limit to the maximum output

capacitance as long as ESR is maintained.

The minimum bypass capacitance for the output is 10

μF (refer to ESR limitations). A 22 μF, or larger, output

bypass capacitor is recommended for typical applications.

Solid tantalums capacitors are recommended as they generally maintain capacitance and ESR ratings over a

wide temperature range. Ceramic capacitor types XR7 and XR5 may be used if a series resistor is added to

simulate the minimum ESR requirement. See Figure 24.

Aluminum electrolytic capacitors are not recommended as they are subject to wide changes in capacitance and

ESR across temperature.

Figure 24. Using Low ESR Capacitors

DELAY CAPACITOR

The capacitor on the Delay pin must be a low leakage type since the charge current is minimal (420 nA typical)

recommended, although changes in capacitance values across temperature changes will have some effect on

the delay timing.

possibly to the point that the Reset pin output does not go high.

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