POWERSTEP01TR datasheet(36/92 Pages) STMICROELECTRONICS

36 / 92 page

Functional description

powerSTEP01

36/92

DocID025022 Rev 5

7.19

Supply management and internal voltage regulators

The powerSTEP01 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

voltage.

The regulator is 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 15).

Figure 15. 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

VCCREG

VREG

7V5 - 15V

3V3

VBOOT

VSREG

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

AM12834v1

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