IC SW USB TRPL 16-QSOP

MAX1940EEE+

Manufacturer Part NumberMAX1940EEE+
DescriptionIC SW USB TRPL 16-QSOP
ManufacturerMaxim Integrated Products
MAX1940EEE+ datasheet
 


Specifications of MAX1940EEE+

ApplicationsUSB, PeripheralsCurrent - Supply60µA
Voltage - Supply4 V ~ 5.5 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case16-QSOP
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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19-2497; Rev 1; 2/10
Triple USB Switch with Autoreset and
General Description
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.
PDAs and Palmtop
USB Ports
Computers
USB Hubs
Docking Stations
Notebook Computers
Desktop Computers
Pin Configuration
TOP VIEW
ONA
1
IN1
2
IN2
3
MAX1940
IN3
4
ONB
5
IN4
6
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
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
PART
MAX1940EEE
Applications
4V TO 5.5V
16
FAULTA
15
OUTA
14
GND
13
OUTB
ACTIVE-HIGH/ACTIVE-LOW
12
FAULTB
SELECTABLE
11
SEL
10
OUTC
9
FAULTC
Fault Blanking
Features
Ordering Information
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C
16 QSOP
Typical Operating Circuit
MAX1940
IN1
FAULTA
FAULTB
IN2
INPUT
FAULTC
IN3
IN4
USB
IN5
OUTA
PORT A
ONA
USB
OUTB
ONB
PORT B
ONC
USB
SEL
OUTC
PORT C
GND
1

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 ...