11

Step-down switching regulator

The IC embeds a high efficiency 100 mA micropower step-down switching regulator. The regulator is protected

against short-circuits or overload conditions. Pulse-by-pulse current limit regulation is obtained in normal

operation through a current loop control.

A low ESR output capacitor connected to the VREG pin helps to limit the regulated voltage ripple; a low ESR (less

than 10 mΩ) capacitor is preferable. The control loop pin FB allows 3.3 V to be regulated, connecting it directly to

VREG, or 5 V connecting it through a voltage divider. The DC/DC converter can be turned off by connecting the

feedback pin to the DCVDD pin.

In some applications it is possible to switch off the embedded DC/DC and supply the VREG by 5 V or 3.3 V

externally. Also, in the case of two or more ICs inside the same board, the user can activate the DC/DC converter

on only one IC, and also supply the VREG pins of the other ICs.

If the DC/DC converter is adjusted to provide 3.3 V regulation and the VDC_out is used to power an external load

and not the device, a 33 kΩ resistor has to be connected on the VREG pin.

Figure 16. Typical circuit for switching regulation VDC-out = 3.3 V

Figure 17. Typical circuit for switching regulation VDC-out = 5 V

IPS8200HQ, IPS8200HQ-1

Step-down switching regulator

DS14313 - Rev 2

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