MAX5943DEEE+ Maxim Integrated Products, MAX5943DEEE+ Datasheet
MAX5943DEEE+
Specifications of MAX5943DEEE+
Related parts for MAX5943DEEE+
MAX5943DEEE+ Summary of contents
Page 1
... FireWire is a registered trademark of Apple Computers, Inc. IEEE 1394 is a trademark of the Institute of Electrical and Electronics Engineers trademark registered trademark of Underwriters Laboratories, Inc. ________________________________________________________________ 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. ORing Switch Controller o Provides Safe Hot Swap for 7 ...
Page 2
FireWire Current Limiter and Low-Drop ORing Switch Controller ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND, unless otherwise noted.) IN ............................................................................-0.3V to +80V OUT ........................................................................-0.3V to +80V SENSE to IN..............................................................-1V to +0.3V GATE1 to SENSE......................................................-0.3V to +8V GATE2 to OUT (internally ...
Page 3
FireWire Current Limiter and Low-Drop ELECTRICAL CHARACTERISTICS (continued 7.5V to 37V, GND = 0V, and (Note 1) PARAMETER SYMBOL GATE2 Pulldown Current During I G2OFF Any GATE2 Turn-Off Condition GATE1 (ORing control) ORing Switch Turn-On ...
Page 4
FireWire Current Limiter and Low-Drop ORing Switch Controller ELECTRICAL CHARACTERISTICS (continued 7.5V to 37V, GND = 0V, and (Note 1) PARAMETER SYMBOL Circuit-Breaker Timeout (MAX5943B–MAX5943E) (Note 7) Automatic Restart Delay After Current-Limit/Circuit-Breaker Timeout GATE1 Turn-Off ...
Page 5
FireWire Current Limiter and Low-Drop (V = +12V +25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE 2.0 1.9 1.8 1.7 1 +85° +25°C A 1.4 1.3 1.2 1.1 T ...
Page 6
FireWire Current Limiter and Low-Drop ORing Switch Controller (V = +12V +25°C, unless otherwise noted GATE2 DRIVE VOLTAGE vs. TEMPERATURE 5.230 5.227 5.224 5.221 5.218 5.215 5.212 5.209 5.206 5.203 5.200 -40 - ...
Page 7
FireWire Current Limiter and Low-Drop (V = +12V +25°C, unless otherwise noted MAX5943A SHORT-CIRCUIT EVENT (V = 37V) IN ILIM = GND 100ns/div MAX5943A SHORT-CIRCUIT RESPONSE (V IN 100ns/div MAX5943E SHORT-CIRCUIT RESPONSE (V IN 100μs/div _______________________________________________________________________________________ ...
Page 8
FireWire Current Limiter and Low-Drop ORing Switch Controller (V = +12V +25°C, unless otherwise noted ORing SWITCHOVER WAVEFORM (V RISING ABOVE V IN2 10μs/div V = 12V IN1 V = 13V IN2 MAX5943A HOT PLUG-IN LOAD ...
Page 9
FireWire Current Limiter and Low-Drop PIN NAME On/Off-Control Input. ON sets the undervoltage lockout threshold and resets the part after a fault latch. Drive ON high to enable the device. Drive ON low to disable the device. Connect ON to ...
Page 10
FireWire Current Limiter and Low-Drop ORing Switch Controller POWER R SENSE SOURCE ONQ1 OR OR_ADJ COMPARATOR THRESHOLD CIRCUIT-BREAKER ILIM (CURRENT-LIMIT) THRESHOLD (FAST CURRENT- LIMIT THRESHOLD) UVLO COMPARATOR + - 6. 1.24V ON COMPARATOR + - 0.4V MAX5943A–MAX5943E ...
Page 11
FireWire Current Limiter and Low-Drop The MAX5943 current-limit/circuit-breaker timeout is programmable by connecting an external resistor from TIM to GND. The MAX5943A has a default 2ms current- limit timeout. The MAX5943B, MAX5943C, MAX5943D, and MAX5943E have 0.5ms, 1ms, 2ms, and ...
Page 12
FireWire Current Limiter and Low-Drop ORing Switch Controller MAX5943B–MAX5943E Circuit Breaker The MAX5943B–MAX5943E provide a circuit-breaker function that protects against excessive load currents and short-circuit conditions. The load current is monitored by sensing the voltage across an external sense resistor ...
Page 13
FireWire Current Limiter and Low-Drop Timing accuracy is guaranteed for R 4kΩ to 50kΩ. Large R values can be used, which TIM reduces timing accuracy. A maximum timeout period is enforced to prevent arbitrarily long operation in current- limit/circuit-breaker conditions. ...
Page 14
FireWire Current Limiter and Low-Drop ORing Switch Controller Reverse Current Override (ONQ1 = High) Drive ONQ1 high to disable the power-supply ORing function. Disabling the MAX5943 ORing function allows reverse current flow through the power-supply system. When ONQ1 is high, ...
Page 15
FireWire Current Limiter and Low-Drop Fault Management The MAX5943 offers either latch or autoretry fault man- agement configurable by the LATCH input. Connect LATCH to IN for latch fault management or connect LATCH to GND for autoretry fault management. In ...
Page 16
FireWire Current Limiter and Low-Drop ORing Switch Controller Select external MOSFETs according to the application current level. The MOSFETs’ on-resistance (R should be chosen low enough to have minimum voltage drop at full load to limit the MOSFET power dissipation. ...
Page 17
FireWire Current Limiter and Low-Drop The programmable timeout of the MAX5943 allows the use of MOSFETs with low power ratings. A MOSFET typically withstands single-shot pulses with higher dis- sipation than the specified package rating. A single-port FireWire protective circuit ...
Page 18
FireWire Current Limiter and Low-Drop ORing Switch Controller FireWire Power Management The MAX5943 serves to regulate and protect FireWire power over a system interface. The MAX5943 program- mable features make it suitable for both power provider and power receiver applications. ...
Page 19
FireWire Current Limiter and Low-Drop (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ ORing Switch Controller Package Information 19 ...
Page 20
... 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. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...