LM60430 datasheet(11/38 Pages) TI

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LM60440, LM60430

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SNVSBN5A – FEBRUARY 2020 – REVISED JUNE 2020

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Feature Description (continued)

Figure 2. Power-Good-Timing Behavior

8.3.2 Enable and Start-up

Start-up and shutdown are controlled by the EN input. This input features precision thresholds, allowing the use

of an external voltage divider to provide an adjustable input UVLO (see the External UVLO section). Applying a

voltage of

≥ VEN-VCC_H causes the device to enter standby mode, powering the internal VCC, but not producing

an output voltage. Increasing the EN voltage to VEN-H fully enables the device, allowing it to enter start-up mode

and start the soft-start period. When the EN input is brought below VEN-H by VEN-HYS, the regulator stops running

and enters standby mode. Further decrease in the EN voltage to below VEN-VCC-L completely shuts down the

device. This behavior is shown in Figure 3. The EN input can be connected directly to VIN if this feature is not

needed. This input must not be allowed to float. The values for the various EN thresholds can be found in the

Electrical Characteristics table.

The LM604x0 uses a reference-based soft start that prevents output voltage overshoots and large inrush

currents as the regulator is starting up. A typical start-up waveform is shown in Figure 4, indicating typical

timings. The rise time of the output voltage is about 4 ms (see the Electrical Characteristics).

LM60430 Datasheet(PDF) 11 Page - Texas Instruments