LP5907 datasheet(13/48 Pages) TI1

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LP5907

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SNVS798N – APRIL 2012 – REVISED APRIL 2018

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Feature Description (continued)

7.3.3 Output Automatic Discharge

The LP5907 output employs an internal 230-Ω (typical) pulldown resistance to discharge the output when the EN

pin is low, and the device is disabled.

7.3.4 Remote Output Capacitor Placement

The LP5907 requires at least a 1-µF capacitor at the OUT pin, but there are no strict requirements about the

location of the capacitor in regards the OUT pin. In practical designs, the output capacitor may be located up to

10 cm away from the LDO.

7.3.5 Thermal Overload Protection (TSD)

Thermal shutdown disables the output when the junction temperature rises to approximately 160°C which allows

the device to cool. When the junction temperature cools to approximately 145°C, the output circuitry enables.

Based on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may

cycle on and off. This thermal cycling limits the dissipation of the regulator and protects it from damage as a

result of overheating.

The thermal shutdown circuitry of the LP5907 has been designed to protect against temporary thermal overload

conditions. The TSD circuitry was not intended to replace proper heat-sinking. Continuously running the LP5907

device into thermal shutdown may degrade device reliability.

7.4 Device Functional Modes

7.4.1 Enable (EN)

The LP5907 Enable (EN) pin is internally held low by a 1-MΩ resistor to GND. The EN pin voltage must be

higher than the VIH threshold to ensure that the device is fully enabled under all operating conditions.

When the EN pin is pulled low, and the output is disabled, the output automatic discharge circuitry is activated.

Any charge on the OUT pin is discharged to GND through the internal 230-Ω (typical) pulldown resistance.

7.4.2 Minimum Operating Input Voltage (VIN)

The LP5907 does not include any dedicated UVLO circuitry. The LP5907 internal circuitry is not fully functional

until VIN is at least 2.2 V. The output voltage is not regulated until VIN has reached at least the greater of 2.2 V or

(VOUT + VDO).

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