L6460 datasheet(52/139 Pages) STMICROELECTRONICS

52 / 139 page

Switching regulator controller

L6460

52/139

Doc ID 17713 Rev 1

Switching regulator controller

This circuit controls an external FET to implement a switching buck regulator using a non

linear pulse skipping control with internally generated PWM signal.

The output voltage will be externally set by a divider network connected on feedback pin. To

reduce as much as possible the regulation voltage error L6460 has the possibility to switch

between four regulator feedback voltage references (and, as a consequence, four under-

voltage thresholds) using serial interface. The feedback reference voltage is selected by

writing the SelFBRef bits in the SwCtrCfg.

This regulator is switched off when L6460 is powered up for the first time and can be

enabled using L6460’s SPI interface.

Here after are summarized the main features of the regulator:

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Soft start circuitry to limit inrush current flow from primary supply.

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Changeable feedback reference voltage

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Internally generated PWM (250 kHz switching frequency).

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Nonlinear pulse skipping control.

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Protected against load short circuit.

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Cycle by cycle current limiting using internal current sensor.

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Under voltage signal (both continuous and latched) accessible through SPI.

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