General Description

The MAX1558/MAX1558H are dual, current-limited

switches with autoreset for USB applications. Autoreset

latches the switch off if it is shorted for more than 20ms,

saving system power. The shorted output is then tested

to determine when the short is removed to automatically

restart the channel. Each channel delivers up to 1.2A

and meets all IEC specifications for USB ports. Low

quiescent supply current (45µA) and standby current

(3µA) conserve battery power in portable applications.

The MAX1558/MAX1558H safety features ensure that the

USB port is protected. Built-in thermal-overload protection

limits power dissipation and junction temperature.

Accurate, programmable current-limiting circuitry pro-

tects the input supply against both overload and short-cir-

cuit conditions. 20ms fault blanking enables the circuit to

ignore transient faults, such as those caused when hot

swapping a capacitive load, preventing false alarms to

the host system. The MAX1558/MAX1558H also feature

reverse-current protection circuitry to block current flow

from the output to the input when the switches are off.

The MAX1558/MAX1558H are available in space-sav-

ing 3mm x 3mm, 10-pin TDFN packages. The MAX1558

is enabled with an active-low signal, and the

MAX1558H is enabled with an active-high signal.

Applications

USB Ports and Hubs

Notebook Computers and Desktops

PDAs and Palmtop Computers

Docking Stations

Features

♦ 55mΩ Switch Resistance

♦ Tiny 10-Pin, 3mm x 3mm TDFN Package

♦ 14% Accurate Current Limit

♦ Autorestart when Fault is Removed

♦ Programmable Current Up to 1.2A

♦ Thermal-Overload Protection

♦ Built-In 20ms Fault Blanking

♦ Compliant to All USB Specifications

♦ 2.7V to 5.5V Supply Range

♦ Independent-Output Fault Indicators

♦ Block Reverse Current when Disabled

♦ 15kV ESD Protection (with Capacitor)

♦ UL Listing Pending

Dual, 3mm x 3mm, 1.2A/Programmable-Current

USB Switches with Autoreset

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-3128; Rev 0; 6/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX1558ETB

-40

°C to +85°C

10 TDFN

(3mm x 3mm)

AAR

MAX1558HETB

-40

°C to +85°C

10 TDFN

(3mm x 3mm)

AAS

MAX1558

INPUT

2.7V TO 5.5V

INA

INB

ISET

FLTA

FLTB

ONA

ONB

ONA

ONB

OUTA

OUTB

GND

USB

PORT A

USB

PORT B

Typical Operating Circuit

2

3

9

8

TDFN

3mm x 3mm

TOP VIEW

4

5

7

6

1

MAX1558

(MAX1558H)

10

ISET

INA

INB

ONA (ONA)

ONB (ONB)

OUTA

GND

OUTB

FLTA

FLTB

Pin Configuration