MAX1812 Maxim, MAX1812 Datasheet
MAX1812
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MAX1812 Summary of contents
Page 1
... Rev 0; 11/00 Dual USB Switch with Fault Blanking General Description The MAX1812 is a dual current-limited switch specifi- cally made for USB applications. Each channel is guar- anteed to supply 500mA and meets USB specifications. The MAX1812’s low quiescent supply current (45µA) and shutdown current (3µA) conserve battery power in portable applications ...
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... FAULTA, FAULTB Current .................................................20mA Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...
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Dual USB Switch with Fault Blanking ELECTRICAL CHARACTERISTICS (continued 5V -40°C to +85°C, unless otherwise noted. Typical values are INA INB A PARAMETER SYMBOL Logic Input High Voltage Logic ...
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... TEMPERATURE (°C) FAULT-BLANKING TIME vs. TEMPERATURE 22 5.0V IN 21.5 21.0 20.5 20.0 85 -40 - TEMPERATURE (°C) OVERLOAD RESPONSE INTO 2.5Ω LOAD (EXPANDED TIME SCALE 500µs/div 5V/div 5V/div IN, F AULTA 5V/div 1A/div OUTA, OUTA MAX1812- ...
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... ONA 1V/div OUTA, STARTUP TIME (TYPICAL USB APPLICATION) MAX1812- 10Ω 150µF OUT C 500µs/div 5V/div 2V/div ONA, OUTA 5V/div 0.5A/div FAULTA, OUTA, MAX1812- 10Ω 1µF OUT ...
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... USB controller when the current-limit, short- circuit, undervoltage-lockout, or thermal-shutdown threshold is reached (Figure 1). The MAX1812 operates from a +4V to +5.5V input volt- age and guarantees a minimum output current of 500mA. A built-in current-limit of 0.9A (typ) limits the current in the event of a heavy overload condition. The ...
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... The fault indicators have a latching delay to prevent short FAULT_ pulses. After the fault-condition is removed, the FAULT_ output will deassert after a 20ms delay. Ensure that the MAX1812 has adequate input bypass capacitance to prevent glitches from triggering FAULT_ outputs. Input glitches greater than 0.2V/µS may cause spurious FAULT_ transitions ...
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... Note that a thermal overload may result from either of these high-current condi- tions. The switches in the MAX1812 may enter current limit in normal operation when powering up or when driving heavy capacitive loads. To differentiate these condi- tions from short circuits or sustained overloads that may damage the device, the MAX1812 has an inde- pendent fault-blanking circuit in each switch ...
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... This induc- tance can cause the output voltage at the USB port to ring during a load step. The MAX1812 is capable of dri- ving inductive loads, but care should be taken to avoid exceeding the device’s absolute maximum ratings. ...
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... Dual USB Switch with Fault Blanking 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © ...