DatasheetsPDF.com

MAX1940 Dataheets PDF



Part Number MAX1940
Manufacturers Maxim
Logo Maxim
Description Triple USB Switch
Datasheet MAX1940 DatasheetMAX1940 Datasheet (PDF)

19-2497; Rev 0; 7/02 Triple USB Switch with Autoreset and Fault Blanking General Description The MAX1940 triple current-limited switch with autoreset 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 control logic and independent shutdown controls for each channel provide additional flexibility.

  MAX1940   MAX1940



Document
19-2497; Rev 0; 7/02 Triple USB Switch with Autoreset and Fault Blanking General Description The MAX1940 triple current-limited switch with autoreset 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 control logic and independent shutdown controls for each channel provide additional flexibility. An autoreset feature 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 protect the USB port. Built-in thermal-overload protection turns off the switch when the die temperature exceeds +160°C. Accurate internal current-limiting circuitry protects the input supply against both overload and shortcircuit conditions. Independent open-drain fault signals ( FAULTA , FAULTB , and FAULTC ) notify the microprocessor when a thermal-overload, current-limit, undervoltage lockout (UVLO), or short-circuit fault occurs. A 20ms fault-blanking feature enables the circuit 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. Features 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 o UL Certification Pending MAX1940 Ordering Information PART MAX1940EEE TEMP RANGE -40°C to +85°C PIN-PACKAGE 16 QSOP Applications USB Ports USB Hubs Notebook Computers Desktop Computers PDAs and Palmtop Computers Docking Stations Typical Operating Circuit MAX1940 IN1 FAULTA FAULTB FAULTC Pin Configuration TOP VIEW ONA 1 IN1 2 IN2 3 IN3 4 ONB 5 IN4 6 IN5 7 ONC 8 16 FAULTA 15 OUTA 14 GND INPUT 4V TO 5.5V IN2 IN3 IN4 IN5 ONA OUTA USB PORT A MAX1940 13 OUTB 12 FAULTB 11 SEL 10 OUTC 9 FAULTC SEL GND OUTC ACTIVE-HIGH/ACTIVE-LOW SELECTABLE ONB ONC USB PORT C OUTB USB PORT B QSOP ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Triple USB Switch with Autoreset and Fault Blanking MAX1940 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_ Continuous Switch Current (per channel, internally limited).........................................1.4A FAULT_ DC Current ............................................................20mA Continuous Power Dissipation (TA = +70°C) 16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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. ELECTRICAL CHARACTERISTICS (VIN_ = 5V, CIN_ = 0.1µF, COUT_ = 1µF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Supply Voltage Range Switch On-Resistance Standby Supply Current Quiescent Supply Current IIN_ SYMBOL VIN_ RON TA = 0°C to +85°C, each switch All switches disabled One switch enabled, IOUT_ = 0 Two switches enabled, IOUT_ = 0 All switches enabled, IOUT_ = 0 OUT_ Off-Leakage Current Undervoltage Lockout Threshold Continuous Load Current Continuous Current Limit Short-Circuit Current Limit Short-Circuit Detect Threshold Continuous Current-Limit Blanking Timeout Period Short-Circuit Blanking Timeout Period Turn-On Delay Output Rise Time Turn-Off Delay Output Fall Time Thermal-Shutdown Threshold ON_, SEL Input High Level ON_, SEL I.


MAX194 MAX1940 MAX195


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)