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Application Note : LDO Regulators (Linear Regulators)

Dual LDO Regulators

There are single input type and dual input type in dual LDO regulators.

The single input type has one shared input pin for both LDO regulators.
The single input type provides a small package due to the reduction of the number of pins.
However, if the difference between the input voltage and the output voltage is large, since the input voltage of both LDO regulators is same voltage, the energy loss and the power dissipation becomes large.

Dual Voltage Regulator

Sequence Control

RP152xxxxC has a sequence control function.
When CE1 and CE2 are enabled, VR2 has 100 µs delay for start up compared with VR1.
As for the shutdown sequence, the discharge period for VR2 is approximately 5 times shorter compared to VR1.

Sequence Control

Dual LDO Regulator Input Types

Single input type

Dual input type

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