USB84604 datasheet(21/61 Pages) MICROCHIP

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DS60001295C-page 21

USB84604

4.0

POWER CONNECTIONS

4.1

Integrated Power Regulators

The integrated 3.3 V and 1.2 V power regulators provide flexibility to the system in providing power the device. Several

different configurations are allowed in order to align the power structure to supplies available in the system.

The regulators are controlled by RESET_N. When RESET_N is brought high, the 3.3 V regulator will turn on. When

RESET_N is brought low the 3.3 V regulator will turn off.

4.1.1

3.3 V REGULATOR

The device has an integrated regulator to convert from VBAT to 3.3 V.

4.1.2

1.2 V REGULATOR

The device has an integrated regulator to convert from a variable voltage input on VDDCOREREG to 1.2 V. The 1.2 V

regulator is tolerant to the presence of low voltage (~0 V) on the VDDCOREREG pin in order to support system power

solutions where a supply is not always present in low power states.

The 1.2 V regulator supports an input voltage range consistent with a 1.8 V input in order to reduce power consumption

in systems which provide multiple power supply levels. In addition, the 1.2 V regulator supports an input voltage up to

3.3 V for systems which provide only a single power supply. The device will support operation where the 3.3 V regulator

output can drive the 1.2 V regulator input such that VBAT is the only required supply.

4.2

Power Configurations

The device supports operation with no back current when power is connected in each of the following configurations.

Power connection diagrams for these configurations are included in Section 4.3, "Power Connection Diagrams," on

page 22.

4.2.1

SINGLE SUPPLY CONFIGURATIONS

4.2.1.1

VBAT Only

VBAT may be tied to the VBAT system supply. VDD33, VDDA33, and VDDCOREREG must be tied together on the

board. In this configuration the 3.3 V and 1.2 V regulators will be active. For HSIC operation, VDD12 may be tied to

VDDCR12.

4.2.1.2

3.3 V Only

VBAT may be tied to the 3.3 V system supply. VDD33, VDDA33, and VDDCOREREG must be tied together on the

board. In this configuration the 3.3 V regulator will operate in dropout mode and the 1.2 V regulator will be active. For

HSIC operation, VDD12 may be tied to VDDCR12.

4.2.2

DUAL SUPPLY CONFIGURATIONS

4.2.2.1

VBAT + 1.8 V

VBAT may be tied to the VBAT system supply. VDDCOREREG may be tied to the 1.8 V system supply. In this configu-

ration, the 3.3 V regulator and the 1.2 V regulator will be active. For HSIC operation, VDD12 may be tied to VDDCR12.

4.2.2.2

3.3 V + 1.8 V

VBAT may be tied to the 3.3 V system supply. VDDCOREREG may be tied to the 1.8 V system supply. In this configu-

ration the 3.3 V regulator will operate in dropout mode and the 1.2 V regulator will be active. For HSIC operation, VDD12

may be tied to VDDCR12.

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