MAX1940EEE+ Maxim Integrated Products, MAX1940EEE+ Datasheet

IC SW USB TRPL 16-QSOP

MAX1940EEE+

Manufacturer Part Number
MAX1940EEE+
Description
IC SW USB TRPL 16-QSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1940EEE+

Applications
USB, Peripherals
Current - Supply
60µA
Voltage - Supply
4 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-QSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1940 triple current-limited switch with auto-
reset supplies a guaranteed 500mA load per channel in
accordance with USB specifications. The MAX1940
operates from a 4V to 5.5V input supply and consumes
only 60µA of quiescent current when operating and only
3µA in standby. Selectable active-high/active-low con-
trol logic and independent shutdown controls for each
channel provide additional flexibility. An autoreset fea-
ture latches the switch off in the event of a short circuit,
saving system power. The switch reactivates upon
removal of the shorted condition.
The MAX1940 provides several safety features to pro-
tect the USB port. Built-in thermal-overload protection
turns off the switch when the die temperature exceeds
+160°C. Accurate internal current-limiting circuitry pro-
tects the input supply against both overload and short-
circuit conditions. Independent open-drain fault signals
(FAULTA, FAULTB, and FAULTC) notify the micro-
processor when a thermal-overload, current-limit,
undervoltage lockout (UVLO), or short-circuit fault
occurs. A 20ms fault-blanking feature enables the cir-
cuit to ignore momentary faults, such as those caused
when hot-swapping a capacitive load, preventing false
alarms to the host system. The fault-blanking feature
also prevents fault signals from being issued when the
device powers up the load.
The MAX1940 is available in a space-saving 16-pin
QSOP package and operates over the extended (-40°C
to +85°C) temperature range.
19-2497; Rev 1; 2/10
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.
USB Ports
USB Hubs
Notebook Computers
Desktop Computers
TOP VIEW
________________________________________________________________ Maxim Integrated Products
ONC
ONA
ONB
IN1
IN2
IN3
IN4
IN5
1
2
3
4
5
6
7
8
General Description
Triple USB Switch with Autoreset and
MAX1940
QSOP
Pin Configuration
PDAs and Palmtop
Computers
Docking Stations
Applications
16
15
14
13
12
11
10
9
FAULTA
OUTA
GND
OUTB
FAULTB
SEL
OUTC
FAULTC
o Triple USB Switch in Tiny 16-Pin QSOP Package
o Autoreset Feature Saves System Power
o Guaranteed 500mA Load Current per Channel
o Built-In 20ms Fault-Blanking Circuitry
o Active-High/Active-Low Control Logic
o Fully Compliant to USB Specifications
o 4V to 5.5V Input Voltage Range
o Independent Shutdown Control
o Independent Fault Indicator Outputs
o Thermal-Overload Protection
o 3µA Standby Current
MAX1940EEE
ACTIVE-HIGH/ACTIVE-LOW
PART
SELECTABLE
4V TO 5.5V
INPUT
Typical Operating Circuit
Fault Blanking
IN1
IN2
IN3
IN4
IN5
ONA
ONB
ONC
SEL
Ordering Information
-40°C to +85°C
TEMP RANGE
MAX1940
GND
FAULTB
FAULTC
FAULTA
OUTC
OUTA
OUTB
USB
PORT A
USB
PORT B
USB
PORT C
PIN-PACKAGE
Features
16 QSOP
1

Related parts for MAX1940EEE+

MAX1940EEE+ Summary of contents

Page 1

... IN5 7 ONC 8 QSOP ________________________________________________________________ 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 Triple USB Switch in Tiny 16-Pin QSOP Package o Autoreset Feature Saves System Power o Guaranteed 500mA Load Current per Channel ...

Page 2

Triple USB Switch with Autoreset and Fault Blanking ABSOLUTE MAXIMUM RATINGS IN_, ON_, OUT_, SEL, FAULT_, to GND...................-0.3V to +6V IN1, IN2 to OUTA......................................................-0.3V to +6V IN2, IN3 to OUTB......................................................-0.3V to +6V IN4, IN5 to OUTC .....................................................-0.3V to +6V OUT_ ...

Page 3

Triple USB Switch with Autoreset and ELECTRICAL CHARACTERISTICS (continued 5V 0.1µ 1µF, T IN_ IN_ OUT_ PARAMETER SYM FAULT_ Output Low Voltage FAULT_ Output High Leakage Current OUT_ Autoreset Current OUT_ ...

Page 4

Triple USB Switch with Autoreset and Fault Blanking (Circuit of Figure 5V 0.1µF, C IN_ IN_ QUIESCENT SUPPLY CURRENT vs. INPUT VOLTAGE 70 ALL SWITCHES ACTIVE 0.5 ...

Page 5

Triple USB Switch with Autoreset and (Circuit of Figure 5V 0.1µF, C IN_ IN_ FAULT OUTPUT LOW VOLTAGE vs. TEMPERATURE 250 R = 4.7kΩ 240 PU 230 220 IN_ V = 5.5V ...

Page 6

Triple USB Switch with Autoreset and Fault Blanking (Circuit of Figure 5V 0.1µF, C IN_ IN_ STARTUP TIME C OUT 10Ω, C SEL OUT_ 400µs/div A: ...

Page 7

Triple USB Switch with Autoreset and PIN NAME 1 ONA Control Input for Switch A. The active polarity of ONA is set by SEL (see Table 1). Power Input. Connect all IN_ inputs together and bypass with a 0.1µF ceramic ...

Page 8

Triple USB Switch with Autoreset and Fault Blanking ONA IN1 SEL MAX1940 ONB ONC Figure 1. Functional Diagram Detailed Description The MAX1940 triple current-limited USB power switch provides three independent switches, each with its own enable-control input and fault indicator ...

Page 9

Triple USB Switch with Autoreset and On/Off Control and Undervoltage Lockout SEL sets the active polarity of the logic inputs of the MAX1940. Connect ON_ to the same voltage as SEL to enable the respective OUT_ switch. Connect ON_ to ...

Page 10

Triple USB Switch with Autoreset and Fault Blanking Table 2. Current-Limiting and Fault Behavior CONDITION If a short is detected at the output, the channel turns off, and the blanking timer begins. FAULT_ remains high during the blanking timeout period. ...

Page 11

Triple USB Switch with Autoreset and MAX1940 IN1 FAULTA FAULTB IN2 INPUT 4V TO 5.5V FAULTC IN3 O.1µF IN4 IN5 OUTA ONA OFF OUTB ONB ON ONC SEL OUTC GND *USB APPLICATIONS MAY REQUIRE ADDITIONAL BULK CAPACITANCE Figure 2. Typical ...

Page 12

Triple USB Switch with Autoreset and Fault Blanking Chip Information PROCESS: BiCMOS 12 ______________________________________________________________________________________ Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates ...

Page 13

... 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 ____________________ 13 © 2010 Maxim Integrated Products ...

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