IC SW USB DUAL W/FB 16-QSOP

MAX1838EEE+

Manufacturer Part NumberMAX1838EEE+
DescriptionIC SW USB DUAL W/FB 16-QSOP
ManufacturerMaxim Integrated Products
MAX1838EEE+ datasheet
 


Specifications of MAX1838EEE+

ApplicationsUSB, PeripheralsVoltage - Supply4 V ~ 5.5 V
Operating Temperature-40°C ~ 85°CMounting TypeSurface Mount
Package / Case16-QSOPLead Free Status / RoHS StatusLead free / RoHS Compliant
Current - Supply-  
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19-2033; Rev 1; 2/10
Dual USB Switch with Fault Blanking
General Description
The MAX1838 is a dual, current-limited USB switch with
auxiliary input supply. Each switch meets all IEC speci-
fications for USB ports and is guaranteed to supply
500mA from either of two input supplies. A control pin
selects the power source from either the main or auxil-
iary supply.
The MAX1838 has multiple protection features, includ-
ing independent thermal-shutdown on each channel to
limit junction temperature in case of a prolonged short
or overload condition. The device has accurate internal
current-limit and reverse-current protection to safe-
guard the input supply against overload. When pow-
ered from the auxiliary supply, the current limit on each
channel is set independently with an external resistor.
An autoreset feature latches the switch off if the output
is shorted, thereby saving system power. When the
short is removed, the switch automatically turns back
on. Independent fault signals (FAULTA and FAULTB)
notify the microprocessor (µP) that the internal current
limit has been reached. A 20ms fault-blanking feature
prevents the MAX1838 from issuing false alarms to the
host during power-up or when hot-swapping into a
capacitive load.
The MAX1838 is available in a space-saving 16-pin
QSOP. For other USB current-limited switches, refer to
the MAX1693, MAX1694, MAX1812, and MAX1823.
Desktops
Notebook Computers
USB Ports
Docking Stations
Pin Configuration
TOP VIEW
GND
1
16
SEL
2
15
AUXA
3
14
MAX1838
INA
4
13
INB
5
12
AUXB
6
11
ON
7
10
GND
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 Dual USB Switch with Auxiliary Input
o Autoreset from Fault Condition
o Guaranteed 500mA Load per Channel
o Programmable Current Limits on Auxiliary Inputs
o Reverse Current Protection
o Thermal Overload Protection
o Built-In 20ms Fault-Blanking
o 4V to 5.5V Range
o Independent FAULT Indicator Outputs
PART
MAX1838EEE
Applications
AUX
FAULTA
IN
ADJA
OUTA2
OUTA1
OUTB2
OUTB1
ADJB
9
FAULTB
and Autoreset
Features
Ordering Information
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C
16 QSOP
Typical Operating Circuit
AUXA
FAULTB
AUXB
FAULTA
MAX1838
OUTB
INA
OUTB
INB
10µF
OUTA
SEL
OUTA
ON
ADJB
ADJA
GND
1

MAX1838EEE+ Summary of contents

  • Page 1

    ... GND 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 Dual USB Switch with Auxiliary Input o Autoreset from Fault Condition o Guaranteed 500mA Load per Channel o Programmable Current Limits on Auxiliary Inputs ...

  • Page 2

    Dual USB Switch with Fault Blanking and Autoreset ABSOLUTE MAXIMUM RATINGS IN_, AUX_, ON, OUT_, SEL, FAULT_, ADJ_ to GND .........................................................-0.3V to +6V IN_, AUX_ to OUTA_; IN_, AUX_ to OUTB_.................-6V to +6V AUX_ to IN_ .................................................................-6V to +6V Maximum ...

  • Page 3

    Dual USB Switch with Fault Blanking ELECTRICAL CHARACTERISTICS (continued SEL = GND, ADJ_ = open IN__ AUX__ +25°C.) PARAMETER SYM BOL Turn-On Delay Output Rise Time Turn-Off Delay from ON Output Fall ...

  • Page 4

    Dual USB Switch with Fault Blanking and Autoreset ELECTRICAL CHARACTERISTICS (continued 5V, SEL = GND, ADJ_ = open IN__ AUX__ PARAMETER SYM BO L Current-Limit Threshold Short-Circuit Current Limit I SHORT Continuous ...

  • Page 5

    Dual USB Switch with Fault Blanking (Circuit of Figure 5V +25°C, unless otherwise noted.) IN_ A AUX QUIESCENT CURRENT vs. V AUX 4. ...

  • Page 6

    Dual USB Switch with Fault Blanking and Autoreset (Circuit of Figure 5V +25°C, unless otherwise noted.) IN_ A FAULT-BLANKING TIME vs. TEMPERATURE 20.5 20.0 19 4.5V AUX V = 5.5V AUX 19.0 V ...

  • Page 7

    Dual USB Switch with Fault Blanking (Circuit of Figure 5V +25°C, unless otherwise noted.) IN_ A SWITCH TURN-ON TIME 1µF OUT MAX1838 toc17 ...

  • Page 8

    Dual USB Switch with Fault Blanking and Autoreset PIN NAME Current-Limit Adjust for Channel A. When operating from auxiliary input, adjust the current limit by 15 ADJA connecting a resistor from ADJA to GND as shown in Programmable Current Limit. ...

  • Page 9

    Dual USB Switch with Fault Blanking Output Fault Protection The MAX1838 senses the switch output voltage and selects 0.9A continuous current limiting when V greater than 1V or short-circuit current limiting when V is less than 1V (see Behavior During ...

  • Page 10

    Dual USB Switch with Fault Blanking and Autoreset between IN and AUX. However, a fault does not trigger since the fault blanking-time is longer than the supply switchover time. Applications Information Input Power Source AUX provides the power for the ...

  • Page 11

    Dual USB Switch with Fault Blanking during a load step. The MAX1838 is capable of driving inductive loads, but avoid exceeding the device’s absolute maximum ratings. Usually the load inductance is relatively small, and the MAX1838’s input includes a substantial ...

  • Page 12

    Dual USB Switch with Fault Blanking and Autoreset 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 ...