L6482 datasheet(33/73 Pages) STMICROELECTRONICS

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L6482

Functional description

Doc ID 023768 Rev 2

33/73

6.18

Supply management and internal voltage regulators

The L6482 integrates two linear voltage regulators: the first one can be used to obtain gate

driver supply starting from a higher voltage (e.g. the motor supply one). Its output voltage

can be set to 7.5 V or 15 V according to the VCCVAL bit value (CONFIG register). The

second linear voltage regulator can be used to obtain the 3.3 V logic supply voltage.

The regulators are designed to supply the internal circuitry of the IC and should not be used

to supply external components.

The input and output voltages of both regulators are connected to external pins and the

regulators are totally independent: in this way a very flexible supply management can be

performed using external components or external supply voltages (Figure 16).

Figure 16.

Device supply pin management

If VCC is externally supplied, the VSREG and VCC pins must be shorted (VSREG must be

compliant with VCC range).

If VREG is externally supplied, the VCCREG and VREG pins must be shorted and equal to

3.3 V.

VSREG must be always less than VBOOT in order to avoid related ESD protection diode turn-

on. The device can be protected from this event by adding an external low drop diode

between the VSREG and VS pins, charge pump diodes should be low drop too.

VCCREG must be always less than VCC in order to avoid ESD protection diode turn-on. The

device can be protected from this event by adding an external low drop diode between the

VCCREG and VSREG pins.

Both regulators provide a short-circuit protection limiting the load current within the

respective maximum ratings.

VBOOT

VSREG

VCC

VCCREG

VREG

7V5 - 15V

3V3

VBOOT

VSREG

VCC

VCCREG

VREG

7V5 - 15V

3V3

VBUS

Using external components

(zener diodes, resistors, ...) it

is possible to reduce internal

power dissipation constrains.

VBUS

VCC

3.3 V

All voltages are internally generated

All voltages are externally supplied

AM15046v1

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