VIN

STOP

RUN

RON

Input

Voltage

LM5010A

RON/SD

Current Limit

Threshold

Io

Normal Operation

Current Limited

Low Load Current

High Load Current

'I

IOCL

IPK

13

LM5010A, LM5010A-Q1

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SNVS376F – OCTOBER 2005 – REVISED MAY 2016

Product Folder Links: LM5010A LM5010A-Q1

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Feature Description (continued)

Figure 9. Inductor Current, Current Limit Operation

7.3.9 Thermal Shutdown

The LM5010Ax should be operated below the maximum operating junction temperature rating. If the junction

temperature increases during a fault or abnormal operating condition, the internal thermal shutdown circuit

activates typically at 175°C. The Thermal Shutdown circuit reduces power dissipation by disabling the buck

switch and the ON timer. This feature helps prevent catastrophic failures from accidental device overheating.

When the junction temperature reduces below approximately 155°C (20°C typical hysteresis), normal operation

resumes.

7.4 Device Functional Modes

7.4.1 Shutdown

The LM5010Ax can be remotely shut down by forcing the RON/SD pin below 0.7 V with a switch or open drain

device. See Figure 10. In the shutdown mode the SS pin is internally grounded, the ON-time one-shot is

disabled, the input current at VIN is reduced, and the VCC bypass switch is turned off. The VCC regulator is not

disabled in the shutdown mode. Releasing the RON/SD pin allows normal operation to resume. The nominal

voltage at RON/SD is shown in the Typical Performance Characteristics. When switching the RON/SD pin, the

transition time should be faster than one to two cycles of the regulator’s nominal switching frequency.

Figure 10. Shutdown Implementation