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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

Enhanced Load Transient Response Speed Version

The RP153LxxxD/E versions have enhanced load transient response characteristics.
In case of an increase in output current, the voltage drop and recovery period at the load change is significantly lower compared with the RP153LxxxA/B versions although its supply current is increased.

Load Transient Response of RP153

Dual LDO Regulator Input Types

Single input type

Dual input type

  • RP153 (Enhanced Load Transient Response Speed Version)
  • RP154

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