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For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

The MAX1812 is a dual current-limited switch specifi-

cally made for USB applications. Each channel is guar-

anteed to supply 500mA and meets USB specifications.

The MAX1812’s low quiescent supply current (45µA)

and shutdown current (3µA) conserve battery power in

portable applications.

The MAX1812 has multiple safety features to ensure

that the USB port is protected. Built-in thermal-overload

protection limits power dissipation and junction temper-

ature. The device also has accurate internal current-lim-

iting circuitry to protect the input supply against both

overload and short-circuit conditions. Independent fault

signals (FAULTA and FAULTB) notify the microproces-

sor when a thermal-overload, current limit, undervoltage

lockout, or short-circuit fault occurs. A 20ms fault-blank-

ing feature enables the circuit to ignore momentary

faults, such as those caused when hot-swapping a

capacitive load, thereby preventing false alarms to the

host system.

The MAX1812 is available in a space-saving 10-pin

µMAX package. For single versions of this device, refer

to the MAX1693, MAX1694, and MAX1607 data sheets.

________________________Applications

USB Ports

USB Hubs

Notebook Computers

Desktop Computers

PDAs and Palmtop Computers

Docking Stations

Features

♦ Dual USB Switch in Tiny 10-Pin µMAX Package

♦ Guaranteed 500mA Load per Channel

♦ Built-In 20ms Fault Blanking

♦ Compliant to USB Specifications

♦ +4.0V to +5.5V Input Voltage Range

♦ 45µA Quiescent Current

♦ 3µA Shutdown Current

♦ Independent Shutdown Control

♦ Independent FAULT Indicator Outputs

♦ Thermal-Overload Protection

♦ UL Listing Pending

MAX1812

Dual USB Switch with Fault Blanking

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

ONBONB

ONAONA

GND

MAX1812

FAULTB

FAULTA

INA

INB

USB

PORT A

OUTA

USB

PORT B

OUTB

INPUT

4.0V TO 5.5V

Typical Operating Circuit

19-1865; Rev 0; 11/00

OUTA

GND

OUTBINB

INA

MAX1812

µMAX

TOP VIEW

ONA

ONB FAULTB

FAULTA

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1812EUB -40°C to +85°C 10 µMAX

MAX1812

Dual USB Switch with Fault Blanking

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= V

INA

= V

INB

= 5V, T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

IN, INA, INB, ONA, ONB, OUTA, OUTB to GND......-0.3V to +6V

FAULTA, FAULTB to GND .........................-0.3V to (V

_ + 0.3V)

INA, IN to OUTA; INB, IN to OUTB..........................-0.3V to +6V

OUTA, OUTB Maximum Continuous Switch Current

(per channel, internally limited) .........................................1.2A

FAULTA, FAULTB Current .................................................20mA

Continuous Power Dissipation (T

= +70°C)

10-Pin µMAX (derate 5.6mW/°C above +70°C) ............444mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range 4.0 5.5 V

= +25°C, each switch 75 105

Switch On-Resistance R

= -40°C to +85°C, each switch 135

mΩ

Standby Supply Current Both switches disabled 3 10 µA

Quiescent Supply Current Both switches enabled, I

OUTA

= I

OUTB

= 0 45 100 µA

Switches disabled, V

OUTA

= V

OUTB

= 0,

= +25°C

0.002 1

OUT_ Leakage Current

Switches disabled, V

OUTA

= V

OUTB

= 0,

= -40°C to 85°C

µA

U nd er vol tag e Lockout Thr eshol d UVLO Rising edge, 3% hysteresis 3.0 3.4 3.8 V

Continuous Load Current 500 mA

Continuous Current Limit ILIM V

_ - V

OUT

_ = 0.5V 0.6 0.9 1.2 A

0.8 1.2 1.6 A( peak)

Short-Circuit Current Limit ISHORT V

OUT

_ = 0 (I

OUT

pulsing)

0.35 A

RMS

Short-Circuit Detect Threshold (Note 2) 1 V

Continuous Current-Limit

Blanking Timeout Period

From continuous current-limit condition to

FAULT_ assertion

10 20 35 ms

Short-Circuit Blanking Timeout

Period

From short-circuit current-limit condition to

FAULT_ assertion

7.5 18 35 ms

Turn-On Delay

OUT

= 10Ω, C

OUT

= 1µF does not include

rise time (from ON_ to 10% of V

OUT

)

0.5 1.2 4.0 ms

Output Rise Time

OUT

= 10Ω, C

OUT

= 1µF, from 10% to

90% of V

OUT

2.5 ms

Turn-Off Delay from ON

OUT

= 10Ω, C

OUT

= 1µF does not include

fall time (from ON_ to 90% of V

OUT

)

0.8 3 ms

Output Fall Time

OUT

= 1µF, R

OUT

= 10Ω, from 90% to 10%

of V

OUT

2.5 ms

Thermal Shutdown Threshold 15°C hysteresis 160 °C

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MAX1812EUB maxim 美信芯片电子元器件中文版规格手册.pdf

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