8

Rev. 1/23/02

SP2026 +2.7V to +5.5V USB Power Control Switch

© Copyright 2002 Sipex Corporation

USB Compliance

The SP2026 is ideal for self-powered and bus-

powered Universal Serial Bus (USB) applica-

tions. A USB port provides a +5.0V bus and

ground return line in addition to a twisted pair

for data.

The SP2026 will comply with the following

USB requirements:

1) The fault current is well below the UL 25VA

safety requirements;

2) The Flag Outputs are available to indicate

fault conditions to USB controllers;

3) The MOSFET switches' low on-resistance

meets USB voltage drop requirements;

4) Each MOSFET switch channel can supply

500mA as required by USB downstream de-

vices;

5) Soft start eliminates any momentary voltage

drops on the upstream port that may occur when

the switches are enabled in bus-powered appli-

cations.

Refer to Table 1 for a USB compliance sum-

mary of the SP2026. Additional features in-

clude the following:

6) An Undervoltage Lockout ensures that the

device remains off unless there is a valid input

supply voltage present;

7) +2.7V and +5.0V logic compatible enable

inputs;

8) Thermal Shutdown prevents the possibility of

catastrophic switch failure from high-current

loads;

8) The device is available in both active-high and

active-low versions.

Refer to Figures 7 to 14 for typical performance

characteristics of the SP2026.

Table 1. USB Protocol Compliance of the SP2026 device

Figure 4. Bypass Capacitor at the Supply Pins

ENA 1

FLGA 2

FLGB 3

ENB 4

0.1

µF to 1.0µF

8 OUTA

7 IN

6 GND

5 OUTB

SP2026

®

®

USB REQUIREMENT

Inrush current limiting required

Suspend State of <500

µA Required

Bus powered hubs must have 350mV drop from cable plug

to port

Voltage supplied to host or hub port is +4.75V to +5.25V

A device that draws bus power must have a stable supply

within 100ms of VBUS reaching +4.4V

Over-current reporting capability required

SP2026 COMPLIANT FEATURE

Soft start turns on in 1ms

Suspend Current of 1

µA maximum

Switch on resistance of 140m

Ω maximum (translates to

70mV at 500mA)

Operating range of +2.7V to +5.5V

Turns on in 1ms

Open drain fault flags