General Description

The MAX1562/MAX1562H/MAX1563 single current-

limited switches provide up to 4A to power up to eight

USB ports. They operate from a 4V to 5.5V input

supply and consume only 40µA of quiescent current

when operating and only 3µA in shutdown.

The MAX1562/MAX1562H/MAX1563s’ autoreset feature

latches the switch off if the output is shorted, thereby

saving system power. When the short is removed, the

switch is reactivated. A fault-blanking feature enables the

circuit to ignore momentary faults, such as those caused

when hot swapping a capacitive load, preventing false

alarms to the host system. Fault blanking also prevents

fault signals from being issued when the device powers

up the load.

The MAX1562/MAX1562H/MAX1563 provide several

safety features to protect the USB port. Built-in thermal-

overload protection turns off the switch when the die

temperature exceeds +160°C. Accurate internal cur-

rent-limiting circuitry protects the input supply against

both overload and short-circuit conditions. An open-

drain fault signal (FAULT) notifies the microprocessor

when a thermal-overload, current-limit, undervoltage

lockout (UVLO), or short-circuit fault occurs.

The MAX1562 has an active-low ON, and the

MAX1562H has an active-high ON enable input. The

MAX1563 has a selectable active-high or active-low

logic-controlled enable. The current limit is pro-

grammed from 1A to 4A using a resistor.

The MAX1562/MAX1562H are available in 8-pin SO

packages and are pin-compatible upgrades to the

MIC2545A/MIC2549A. The MAX1563 provides the

same features and higher current performance in a

smaller 12-pin (4mm x 4mm) QFN package. These

devices operate over an extended temperature range

(-40°C to +85°C). An evaluation kit is available to speed

designs.

Applications

Notebook Computers

Desktop Computers

USB Ports and Hubs

PDAs and Palmtop Computers

Docking Stations

Features

o Programmable Current Limit (1A to 4A) with

Resistor

o Autoreset Feature Saves System Power

o 20ms Fault-Blanking Circuitry

o Active-High/Low Control Logic

o Fault-Indicator Output

o Thermal-Overload Protection

o Smaller 4mm x 4mm QFN Package (MAX1563)

o 3µA Shutdown Current

o UL Certification Pending

Programmable 4A USB Current-Limited

Switches with Autoreset and Fault Blanking

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-2631; Rev 0; 7/03

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.

EVALUATION

KIT

AVAILABLE

Pin Configurations appear at end of data sheet.

PART

TEMP RANGE

PIN-PACKAGE

MAX1562ESA

-40°C to +85°C

8 SO

MAX1562HESA

-40°C to +85°C

8 SO

MAX1563ETC

-40°C to +85°C

12 QFN 4mm x 4mm

MAX1562

MAX1562H

MAX1563

FAULT

OUT

OUT

ISET

SEL

ON

IN

IN

USB

PORT

GND

INPUT

4V TO 5.5V

MAX1563

ONLY

ACTIVE-HIGH/ACTIVE-LOW

SELECTABLE

Typical Operating Circuit