USB3503 datasheet(63/82 Pages) SMSC

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USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3503A

Revision 1.1 (02-07-13)

DATASHEET

Chapter 9 Integrated Power Regulators

9.1

Overview

The integrated power regulators are designed to provide significant flexibility to the system in providing

power to the USB3503. Several different configurations are allowed in order to align the USB3503

power structure to the supplies available in the system.

9.1.1

3.3V Regulator

The USB3503 has an integrated regulator to convert from VBAT to 3.3V.

9.1.2

1.2V Regulator

The USB3503 has an integrated regulator to convert from a variable voltage input on

VDD_CORE_REG to 1.2V. The 1.2V regulator shall be tolerant to the presence of low voltage (~0V)

on the VDD_CORE_REG pin in order to support system power solutions where a 1.8V supply is not

always present in low power states.

The 1.2V regulator shall support an input voltage range consistent with a 1.8V input in order to reduce

power consumption in systems which provide multiple power supply levels. In addition the 1.2V

regulator shall support an input voltage up to 3.3V for systems which provide only a single power

supply. The device will support operation where the 3.3V regulator output can drive the 1.2V regulator

input such that VBAT is the only required supply.

9.2

Power Configurations

The USB3503 support operation with no back current when power is connected in each of the following

configurations.

9.2.1

Single Supply Configurations

9.2.1.1

VBAT Only

VBAT should be tied to the VBAT system supply. VDD33_BYP regulator output and VDD_CORE_REG

should be tied together on the board. In this configuration the 3.3V regulator will be active, and the

3.3V to 1.2V regulator will be active.

9.2.1.2

3.3V Only

VBAT should be tied to the 3.3V system supply. VDD33_BYP and VDD_CORE_REG pins should be

tied together on the board. In this configuration, the 3.3V regulator will operate in dropout. The 1.2V

regulator will be active.

9.2.2

Double Supply Configurations

9.2.2.1

VBAT + 1.8V

VBAT should be tied to the VBAT system supply. VDD33_BYP regulator output requires external

capacitor. VDD_CORE_REG should be tied to the 1.8V system supply. In this configuration, the 3.3V

regulator and the 1.2V regulator will be active.

USB3503 Datasheet(PDF) 63 Page - SMSC Corporation

USB3503 Datasheet(HTML) 63 Page - SMSC Corporation

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