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HotSwitch鈩?USB Power Distribution

Switch With Shutdown

July 18, 2000

SC2041

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

USB power distribution switches are high-side

N-channel MOSFET switches with built-in overcurrent

protection and low on-state resistance. The SC2041

switch is designed to meet the USB requirements for

power switching and maintenance-free fault protection

for self-powered & bus-powered hub applications. The

SC2041 features low on-state resistance to meet the

USB requirement for voltage drop and regulation. The

switch is controlled by a shutdown input that is

compatible with 3V and 5V logic. The device is active

when the shutdown input is low. See SC2051 for an

active high version. The device provides short circuit

current limiting at a value of less than 1.0A, well below

the USB limit of 5A. During an overcurrent condition the

device provides a fault notification to signal the USB

controller. An integrated thermal protection circuit

automatically shuts the switch off when the junction

temperature reaches its thermal limit. The switch

remains off until the junction temperature drops

approximately 20擄C. The switch will continue to cycle

on and off until the fault is removed. Inrush current

limiting prevents voltage drop on an upstream port

when the switch is enabled. An undervoltage lockout

circuit guarantees the switch is initially off during

start-up.

FEATURES

鈥?

Designed to meet USB specification revisions 1.1

鈥?

鈥?

鈥?

鈥?

鈥?

鈥?

鈥?

鈥?

鈥?

鈥?

and 2.0 power management requirements

500mA continuous load current

High-side MOSFET switch with low R

DS(ON)

Short-circuit current protection

Internal thermal shutdown

Undervoltage lockout

Open drain fault output

Soft start circuit with slow turn-on time

Wide supply voltage range: 2.8V to 5.5V

2.5kV ESD rating (Human Body Model)

Full industrial temperature range

APPLICATIONS

鈥?

Universal Serial Bus (USB) power management

鈥?

Self-powered or bus-powered USB hubs

鈥?

Root hubs in desktop PCs & servers

鈥?

Notebook PCs

鈥?

Peripherals

ORDERING INFORMATION

DEVICE

SC2041IS.TR

(1)

PACKAGE

SO-8

Note:

(1) Only available in tape and reel packaging. A reel

contains 2500 devices.

TYPICAL APPLICATION CIRCUIT

U1

1

VBUS IN

2

3

Shutdown Signal From USB Controller

R1

4

GND

IN

IN

SHDN

SC2041

OUT

OUT

OUT

FLG

8

7

6

5

VBUS OUT

Flag Output To USB Controller

C1

0.1uF

C2

0.1uF

C3

22uF

1

漏 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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