Voltage Regulator Application Note

How to Switch the ECO Function

There are four methods of switching the ECO Function, and Ricoh offers four types of products utilizing each method.

[1] Manual Mode Shift Type The mode is switched by H/L input to an ECO pin.
[2] Automatic Mode Shift Type The voltage regulator automatically switches between modes depending on system load.
The switching point is fixed in the IC.
[3] Seamless Type Instead of switching between two modes, a transition is made between modes depending on the output current.
[4] Manual/Automatic Mode Shift Type The mode is switched by H/L input to an AE pin.
When AE="H", the mode is set to the fast response mode, and when AE="L", the voltage regulator operates like the Automatic Mode Shift Type.
This type has both advantage of the Manual Mode Shift Type and the Automatic Mode Shift Type.
Manual Mode Shift Type (with ECO pin) Automatic Mode Shift Type Seamless Type
Manual Mode Shift Type (with ECO pin) Automatic Mode Shift Type Seamless Type
The mode is switched by controlling H/L to the ECO pin. Switching occurs between low power mode and fast response mode depending on system load (output current). The supply current smoothly decreases as the system load (output current) decreases.
Manual/Automatic Mode Shift Type
Manual/Automatic Mode Shift Type Manual/Automatic Mode Shift Type
Fast response mode and Automatic mode shift can be switched by controlling H/L to the AE pin.
ECO Function Included
Manual Mode Shift Type
Automatic Mode Shift Type
Seamless Type
Manual/Automatic Mode Shift Type

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