MAX1922ETB+TC3B Maxim Integrated Products, MAX1922ETB+TC3B Datasheet

MAX1922ETB+TC3B

Manufacturer Part Number

MAX1922ETB+TC3B

Description

IC SWITCH CURRENT-LIMIT 10-TDFN

Manufacturer

Maxim Integrated Products

Type

USB Switchr

Datasheet

1.MAX1922ETBT.pdf (9 pages)

Specifications of MAX1922ETB+TC3B

Number Of Outputs

Rds (on)

100 mOhm

Internal Switch(s)

Yes

Current Limit

Voltage - Input

2.7 ~ 5.5 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

10-TDFN Exposed Pad

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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The MAX1922 current-limited 70mΩ switch with built-in

fault blanking provides an accurate, preset 1.4A to 2.1A

current limit, making it ideal for dual USB applications.

Its low quiescent supply current (16µA) and standby

current (1µA) conserve battery power in portable appli-

cations. The MAX1922 operates with inputs from 2.7V

to 5.5V, making it ideal for both 3V and 5V systems.

An overcurrent signal (OC) notifies the microprocessor

that the internal current limit has been reached. A 10ms

overcurrent-blanking feature allows momentary faults

(such as those caused when hot-swapping into a

capacitive load) to be ignored, thus preventing false

alarms to the host system. This blanking also prevents

an OC signal from being issued when the device is

powering up.

The MAX1922 has several safety features to ensure that

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

tection limits power dissipation and junction tempera-

ture. The device also has accurate internal current-

limiting circuitry to protect the input supply against

overload.

The MAX1922 is offered in a space-saving 8-pin SO

package and a 10-pin TDFN package and operates over

the extended (-40°C to +85°C) temperature range.

19-2254; Rev 3; 4/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

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

Pin Configurations continued at end of data sheet.

TOP VIEW

Notebook Computers

USB Ports

USB Hubs

Docking Stations

1A Current-Limited Switch for 2 USB Ports

GND

________________________________________________________________ Maxim Integrated Products

General Description

Pin Configurations

MAX1922

Applications

OUT

o Accurate Current Limit (1.4A min, 2.1A max)

o 10ms Internal OC Blanking Timeout

o OC Blanking During Power-Up

o 125mΩ (max) High-Side MOSFET

o Short-Circuit and Thermal Protection with

o Undervoltage Lockout

o 16µA Quiescent Supply Current

o 1µA (max) Standby Supply Current

o 2.7V to 5.5V Supply Range

o UL Recognized: UL# E211395

* EP = Exposed paddle.

+ Denotes a lead(Pb)-free/RoHS-compliant package.

MAX1922ESA+

MAX1922ETB+

Overcurrent Logic Output

2.7V TO 5.5V

PART

INPUT

OFF

Typical Operating Circuit

-40°C to +85°C

TEMP RANGE

Ordering Information

MAX1922

GND

8 SO

10 TDFN-EP*

PIN-

PACKAGE

OUT

Features

MARK

OUTPUT

AQQ

TOP

—

Related parts for MAX1922ETB+TC3B

MAX1922ETB+TC3B Summary of contents

Page 1

... Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. o Accurate Current Limit (1.4A min, 2.1A max) o 10ms Internal OC Blanking Timeout o OC Blanking During Power-Up o 125mΩ ...

Page 2

Current-Limited Switch for 2 USB Ports ABSOLUTE MAXIMUM RATINGS IN, EN GND...................................................-0.3V to +6V OUT to GND ................................................-0. Maximum Switch Current.........................2.3A (internally limited) OUT Short-Circuit to GND ..........................................Continuous Stresses beyond those listed under “Absolute Maximum ...

Page 3

Current-Limited Switch for 2 USB Ports ELECTRICAL CHARACTERISTICS (continued 5V 0°C to +85°C, unless otherwise noted. Typical values are PARAMETER SYMBOL OC Off-State Current OC Blanking Timeout Period THERMAL SHUTDOWN Thermal ...

Page 4

Current-Limited Switch for 2 USB Ports (Circuit of Figure 5V +25°C, unless otherwise noted QUIESCENT CURRENT vs. INPUT VOLTAGE OUT ...

Page 5

Current-Limited Switch for 2 USB Ports (Circuit of Figure 5V +25°C, unless otherwise noted CURRENT-LIMIT AND OC RESPONSE 2ms/div SWITCH TURN-ON TIME 20μs/div _______________________________________________________________________________________ ...

Page 6

Current-Limited Switch for 2 USB Ports PACKAGE NAME TDFN GND Ground Inp ut channel sour ce— connect ...

Page 7

Current-Limited Switch for 2 USB Ports outputs. Input voltage glitches less than 150mV do not cause a spurious OC output. Load-transient faults less than 10ms (typ) will not cause an OC output assertion. Only current-limit faults are blanked. Die ...

Page 8

Current-Limited Switch for 2 USB Ports Pin Configurations (continued) TOP VIEW MAX1922 + TDFN 8 _______________________________________________________________________________________ PROCESS: BiCMOS 6 For the latest package outline information and land patterns www.maxim-ic.com/packages. ...

Page 9

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2009 Maxim Integrated Products ...

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