NR/FB

EN

1

2

3

4

8

7

6

5

GND PLANE

GND PLANE

CIN

COUT

N/C

N/C

N/C

VOUT

VIN

TPS73601DRB

TPS732

SBVS037P – AUGUST 2003 – REVISED DECEMBER 2015

www.ti.com

Layout Examples (continued)

Figure 38. Adjustable Output Voltage Option Layout (DRB Package)

10.3 Thermal Considerations

Thermal protection disables the output when the junction temperature rises to approximately 160°C, allowing the

device to cool. When the junction temperature cools to approximately 140°C, the output circuitry is again

enabled. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection

circuit may cycle on and off. This limits the dissipation of the regulator, protecting it from damage due to

overheating.

Any tendency to activate the thermal protection circuit indicates excessive power dissipation or an inadequate

heatsink. For reliable operation, junction temperature should be limited to 125°C maximum. To estimate the

margin of safety in a complete design (including heatsink), increase the ambient temperature until the thermal

protection is triggered; use worst-case loads and signal conditions. For good reliability, thermal protection should

trigger at least 35°C above the maximum expected ambient condition of your application. This produces a worst-

case junction temperature of 125°C at the highest expected ambient temperature and worst-case load.

The internal protection circuitry of the TPS732 has been designed to protect against overload conditions. It was

not intended to replace proper heatsinking. Continuously running the TPS732 into thermal shutdown will degrade

device reliability.

20

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