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VIN ± VOUT (V)

Limited by

Minimum Operating VIN

Limited by

Maximum Operating VIN

Limited by

Rated Output Current

Limited by

Dropout

Limited by

Thermals

Recommended Area for

Continuous Operation

LP5922

SNVSAG0 – NOVEMBER 2016

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8.2.2.9 Recommended Continuous Operating Area

The continuous operational area of an LDO is limited by the input voltage (VIN), the output voltage (VOUT), the

dropout voltage (VDO), the output current (IOUT), and the junction temperature (TJ). The recommended area for

continuous operation for a linear regulator can be separated into the following steps, and is shown in Figure 16.

•

Limited by dropout: Dropout voltage limits the minimum differential voltage between the input and the output

(VIN – VOUT) at a given output current level.

•

Limited by the rated output current: The rated output current limits the maximum recommended output current

level. Exceeding this rating causes the device to fall out of specification.

•

Limited by thermals: This portion of the boundary is defined by Equation 6. The slope is nonlinear because

the junction temperature of the LDO is controlled by the power dissipation (PD) across the LDO; therefore,

when VIN – VOUT increases, the output current must decrease in order to ensure that the rated maximum

operating junction temperature of the device is not exceeded. Exceeding the maximum operating junction

temperature rating can cause the device to fall out of specifications, reduces long-term reliability, and may

activate the thermal shutdown protection circuitry.

•

Limited by VIN range: The rated operating input voltage range governs both the minimum and maximum of

VIN – VOUT.

Figure 16. Recommended Continuous Operating Area

Figure 17 to Figure 22 show the recommended continuous operating area boundaries for this device in the

WSON (DSC) package mounted to a EIA/JEDEC High-K printed circuit board, as defined by JESD51-7, with an

RθJA rating of 49.5°C/W.

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