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MAX1838_10

更新时间： 2024-10-03 11:18:15
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13页 316K
描述
Dual USB Switch with Fault Blanking and Autoreset

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MAX1838_10 数据手册

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19-2033; Rev 1; 2/10  
Dual USB Switch with Fault Blanking  
and Autoreset  
MAX138  
General Description  
Features  
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.  
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  
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.  
o 4V to 5.5V Range  
o Independent FAULT Indicator Outputs  
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.  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX1838EEE  
-40°C to +85°C  
16 QSOP  
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.  
Applications  
Desktops  
Typical Operating Circuit  
Notebook Computers  
USB Ports  
Docking Stations  
Pin Configuration  
AUX  
IN  
AUXA  
AUXB  
FAULTB  
FAULTA  
TOP VIEW  
GND  
SEL  
1
2
3
4
5
6
7
8
16 FAULTA  
15 ADJA  
MAX1838  
OUTB  
OUTA  
INA  
INB  
OUTB  
10µF  
AUXA  
INA  
14 OUTA2  
13 OUTA1  
12 OUTB2  
11 OUTB1  
10 ADJB  
MAX1838  
SEL  
ON  
OUTA  
INB  
ADJB  
ADJA  
AUXB  
ON  
GND  
GND  
9
FAULTB  
QSOP  
________________________________________________________________ Maxim Integrated Products  
1
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.  
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