Voltage Regulator Application Note

ECO Function

ECO Function

An ECO Function is a function which implements a High-performance Type Voltage Regulator and a Low Supply Current Type Voltage Regulator integrated in a single chip. Having this ECO function enables a performance of three operating modes instead of only two; On mode, Off mode, and Sleep mode.
The voltage regulator with ECO function is able to switch between a fast response mode (high-performance) and a low power mode (low supply current), additionally it can be switched to the Off mode by the CE pin.
The voltage regulator with ECO function is able to reduce the supply current and number of parts on the board space since it switches between those modes depending on the device status.

Comparison of Supply Current

The examples of the supply current of a Low Supply Current Type Voltage Regulator, a Voltage Regulator with ECO Function, and a High-performance Type Voltage Regulator are shown in below table.

Low Supply Current Type
RP110x
ECO Function Included
RP201x
High-performance Type
RP112x
Typ. 1µA Low Power Mode : Typ. 1.5µA
Fast Response Mode : Typ. 55µA
Typ. 75µA

Comparison of Ripple Rejection Ratio

The ripple rejection ratio graph of a Low Supply Current Type Voltage Regulator, a Voltage Regulator with ECO Function and High-performance Type Voltage Regulator. (Since the measurement conditions may be slightly different, please consider below graphs as a reference)

Comparison of Ripple Rejection Ratio

Comparison of Load Transient Response

The load transient response graph of a Low Supply Current Type Voltage Regulator, a Voltage Regulator with ECO Function and High-performance Type Voltage Regulator. (Since the measurement conditions may be slightly different, please consider below graphs as a reference)
Please note that the scale of the horizontal-axis for Low Supply Current Type and a Low Power Mode are in "ms", while those of a High-performance Type and a Fast Response Mode are in "µs", the load transient response is more than 100 times faster and output voltage variations are suppressed to 1/10.

Comparison of Load Transient Response

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