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LM78M05-MIL

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SNVSAX6 – JUNE 2017

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8.2.2.4 Output Capacitor

This device is designed to be stable with no output capacitance and can be omitted from the design if needed.

However if large changes in load are expected, an output capacitor is recommended to improve the transient

response.

8.2.3 Application Curves

Figure 13. Maximum Allowable Power Dissipation

vs Ambient Temperature for PFM

Figure 14. Maximum Allowable Power Dissipation vs 2-oz Copper Area for PFM

9 Power Supply Recommendations

V. If the device is more than four inches from the power supply filter capacitors, an input bypass capacitor 0.1-µF

or greater of any type is recommended.

10 Layout

10.1 Layout Guidelines

Follow these layout guidelines to ensure proper regulation of the output voltage with minimum noise. TI

recommends that the input terminal be bypassed to ground with a bypass capacitor. The optimum placement is

closest to the input terminal of the device and the system GND. Take care to minimize the loop area formed by

the bypass-capacitor connection, the input terminal, and the system GND. Traces carrying the load current must

be wide to reduce the amount of parasitic trace inductance. In cases when VIN shorts to ground, an external

diode must be placed from VOUT to VIN to divert the surge current from the output capacitor and protect the

device. This diode must be placed close to the corresponding device pins to increase their effectiveness.