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NEW PRODUCTS 5

Pch HIGH-SIDE SWITCH FOR USB

碌PD16855

HOST

(PC)

Takahiro Hattori

HUB (PC Monitor)

Scanner

USB HUB

Printer

Modem

CCD Camera

Keyboard

Mouse

PC peripheral units can be connected with a standardized cable.

USB line

Fig. 1 USB System

Introduction

Personal computers (PCs) have become

widespread in recent years, and new

proposals have been made concerning the

interfaces that connect a PC and peripheral

units. These proposals include standards

such as the Universal Serial BUS (USB) and

IEEE1394 intended to supersede the existing

interfaces. Figure 1 shows a USB system.

NEC has developed many devices that

conform to the USB and IEEE1394

standards, such as the

碌PD72011

USB hub

controller IC and the

碌PD789800

keyboard

microcontroller with USB capability.

When designing a USB-supporting unit,

a power management circuit is essential for

obtaining power from the USB port and

supplying it to the peripheral devices.

The

碌PD16855

Pch high-side switch for

USB developed this time is an intelligent

power IC that supplies power to peripheral

devices, which is a key requirement for USB-

supporting units, and overcurrent limiting

operation in case of an abnormality. By

using this IC with a USB controller IC,

system designers can easily design USB-

supporting units.

Why Is Pch High-Side Switch for USB

Necessary?

A high-side switch having an overcurrent

limiting function for power management is

necessary for a USB supporting unit. This

is because the USB standard stipulates the

following concerning the power supply:

鈥?HOST and Self-Powered HUB

Published July 1998

General-Purpose Device Engineering Department, Semiconductor Solution Engineering Division

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