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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 Recognized: UL# E211395

MAX1558/MAX1558H

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

USB Switches with Autoreset

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-3128; Rev 2; 3/08

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

TDFN

3mm x 3mm

TOP VIEW

MAX1558

(MAX1558H)

ISET

INA

INB

ONA (ONA)

ONB (ONB)

OUTA

GND

OUTB

FLTA

FLTB

Pin Configuration

Denotes a lead-free package.

Summary of content (14 pages)

PAGE 1
9-3128; Rev 2; 3/08 Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset 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.
PAGE 2
MAX1558/MAX1558H Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset ABSOLUTE MAXIMUM RATINGS IN_, ON_, OUT_, ISET, FLT_ to GND........................-0.3V to +6V IN_ to OUT_ (when disabled) (Note 1) ........................-6V to +6V IN_ to OUT_ (when enabled) (Note 2) ............-1.6A to +1.6ARMS FLT_ Sink Current................................................................20mA Continuous Power Dissipation (TA = +70°C) 10-Pin TDFN 3mm x 3mm (derate 24.4mW/°C above +70°C) ........
PAGE 3
Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset (VINA = VINB = 5V, V ONA = V ONB = 0V (MAX1558), VONA = VONB = 5V (MAX1558H), RISET = 26kΩ to GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (VINA = VINB = 5V, V ONA = V ONB = 0V (MAX1558), VONA = VONB = 5V (MAX1558H), RISET = 26kΩ to GND, TA = -40°C to +85°C, unless otherwise noted.
PAGE 5
Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset SWITCH OFF-LEAKAGE CURRENT vs. TEMPERATURE 2.5 2.0 1.5 1.0 0.5 -15 10 35 60 10 1 0.1 -40 -15 10 35 60 0 1 2 3 4 5 NORMALIZED ON-RESISTANCE vs. TEMPERATURE CONTINUOUS CURRENT-LIMIT THRESHOLD vs. TEMPERATURE TURN-ON TIME vs. TEMPERATURE (tON + tRISE) 1.44 8 1.43 7 TURN-ON TIME (ms) 1.42 1.41 1.40 1.39 1.38 -15 10 35 60 VIN_ = 4.5V 6 5 VIN_ = 5.5V VIN_ = 5V 4 1.37 1.36 1.35 0.
PAGE 6
Typical Operating Characteristics (continued) (VINA = VINB = 5V, V ONA = V ONB = 0V (MAX1558), VONA = VONB= 5V (MAX1558H), RISET = 26kΩ to GND. Typical values are at TA = +25°C, unless otherwise noted.) AUTORESET CURRENT vs. INPUT VOLTAGE AUTORESET CURRENT vs. TEMPERATURE 34 32 30 28 VIN_ = 5V VIN_ = 4.5V 26 24 MAX1558/58H toc14 VIN_ = 5.5V 36 AUTORESET CURRENT (mA) 38 40 MAX1558/58H toc13 40 AUTORESET CURRENT (mA) MAX1558/MAX1558H Dual, 3mm x 3mm, 1.
PAGE 7
Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset PIN NAME FUNCTION 1 INA 2 ONA *(ONA) Control Input for Switch A. Can be driven higher than IN_ without damage. A logic low turns switch A on for the MAX1558. A logic high turns switch A on for the MAX1558H. 3 ISET Current-Limit Adjust for Both Channels. Connect a resistor between 26kΩ to 60kΩ from ISET to ground to program the current limit. See Setting the Current Limit in the Applications Information section.
PAGE 8
MAX1558/MAX1558H Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset INA FLTA INA ONA CHARGE PUMP ONA ILIMA BIAS OUTA THERMAL SHUTDOWN UVLO 30mA FAULT LOGIC REF GND 30mA OSC 25kHz TIMER 20ms OUTB ONB CHARGE PUMP ONB ILIMB INB INB 0.6V PROGRAM ILIMA PROGRAM ILIMB FLTB MAX1558 ISET Figure 2.
PAGE 9
Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset The MAX1558/MAX1558H include a UVLO circuit to prevent erroneous switch operation when the input voltage is low during startup and brownout conditions. Operation is inhibited when VIN_ is less than 2.5V. Output-Current Fault Protection The current limit for both switch outputs is programmed by a resistor between 26kΩ and 60kΩ connected from ISET to ground. See the Current-Limit Program vs.
PAGE 10
MAX1558/MAX1558H Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset Applications Information Setting the Current Limit A resistor from ISET to ground programs the currentlimit value for both outputs. Use a resistor between 26kΩ and 86kΩ to set the current limit according to the formula: ILIM(TYPICAL) = 36400 / RISET (Amps) Do not use RISET values below 26kΩ because the maximum current rating of the device may be exceeded.
PAGE 11
Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset P = 0.5 x (1.5A) x (5V - 1V) = 3W Since the package power dissipation is limited to 1952mW, the MAX1558/MAX1558H die temperature exceeds the thermal-shutdown threshold and the switch turns off. After the die temperature cools by 10°C, the switch turns on again. If the fault-overload condition continues, the switch cycles on and off with a duty cycle and period that is a function of the ambient temperature and PC board layout.
PAGE 12
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 6, 8, &10L, DFN THIN.EPS MAX1558/MAX1558H Dual, 3mm x 3mm, 1.
PAGE 13
Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset COMMON DIMENSIONS PACKAGE VARIATIONS SYMBOL MIN. MAX. PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e A 0.70 0.80 T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF D 2.90 3.10 T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF E 2.90 3.10 T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF A1 0.00 0.05 T1033-1 10 1.50±0.10 2.30±0.
PAGE 14
MAX1558/MAX1558H Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset Revision History REVISION NUMBER REVISION DATE 2 3/08 DESCRIPTION Changed “UL Listing Pending” to “UL Recognized: UL # E211395” PAGES CHANGED 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.