L6460 datasheet(30/139 Pages) STMICROELECTRONICS

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Internal supplies

L6460

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Doc ID 17713 Rev 1

Internal supplies

L6460 includes three internal regulators used to provide a regulated voltage to internal

circuits.

The internal regulators are the following:

- VSupplyInt regulator.

- Charge pump regulator.

- V3v3 regulator.

4.1

VSupplyInt regulator

VSupplyInt is the output of an internal regulator used to supply some internal circuits. This

regulator is not intended to provide external current so it must not be used to supply external

loads. An external capacitor must always be connected to this pin (preferably towards

VSupply pin), recommended value is in the range 80 ÷ 120 nF.

Figure 3.

VSupplyInt pin

The VSupplyInt pin may also be externally connected to VSupply pin by means of an external

resistor REXT: this allows REXT, particularly when VSupply is at the max values of the

operative supply range, to dissipate power that otherwise would be dissipated inside the

chip. The choice of the optimal resistor depends on the application since it is strictly

depending on both VSupply and the current used inside the chip (that is changing with the

chosen configuration).

EXT could be chosen by applying this formula: REXT = (VSupply min - VS_Int max)/(IS_Int max).

S_Int max is depending from the chosen configuration and represents the total current needed

by the circuits connected to this pin.

For example, with V

Supply = 32 V and IS_Int = 12 mA a typical resistor value is 1 kΩ.

VsupplyInt

IS_Int_TYP

Vsupply

GND

internal

circuits

L6460

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