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MAX5939

Features: · Allows Safe Board Insertion and Removal from a Live -48V Backplane· Pin-Compatible with LT1640 and LT4250· Circuit Breaker Immunity to Input Voltage Steps and Current Spikes· 450mA GATE Pulldown Current During Short- Circuit Condition· Exponential GATE Pulldown Current· Withstands -100...

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SeekIC No. : 004411448 Detail

MAX5939: Features: · Allows Safe Board Insertion and Removal from a Live -48V Backplane· Pin-Compatible with LT1640 and LT4250· Circuit Breaker Immunity to Input Voltage Steps and Current Spikes· 450mA GATE ...

MAX5939 Data Sheet

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Part Number:
MAX5939
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/27

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Product Details

Description



Features:

· Allows Safe Board Insertion and Removal from a Live -48V Backplane
· Pin-Compatible with LT1640 and LT4250
· Circuit Breaker Immunity to Input Voltage Steps and Current Spikes
· 450mA GATE Pulldown Current During Short- Circuit Condition
· Exponential GATE Pulldown Current
· Withstands -100V Input Transients with No External Components
· Programmable Inrush and Short-Circuit Current Limits
· Operates from -20V to -80V
· Programmable Overvoltage Protection
· Programmable Undervoltage Lockout with Built-In Glitch Filter
· Overcurrent Fault Integrator
· Powers Up into a Shorted Load
· Power-Good Control Output
· Thermal Shutdown Protects External MOSFET


Application

·Telecom Line Cards
·Network Switches/Routers
·Central-Office Line Cards
·Server Line Cards
·Base-Station Line Cards


Pinout

Connection Diagram


Specifications

All Voltages Are Referenced to VEE, Unless Otherwise Noted
Supply Voltage (VDD - VEE )............................-0.3V to +100V
DRAIN, PWRGD, PWRGD ................................-0.3V to +100V
PWRGD to DRAIN ........................................... -0.3V to +95V
PWRGD to VDD.................................................-95V to +85V
SENSE (Internally Clamped) ..........................-0.3V to +1.0V
GATE (Internally Clamped) .............................-0.3V to +18V
UV and OV......................................................-0.3V to +60V
Current into SENSE...................................................+40mA
Current into GATE...................................................+300mA
Current into Any Other Pin........................................+20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)...........471mW
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


Description

The MAX5921/MAX5939 hot-swap controllers allow a circuit card to be safely hot plugged into a live backplane.

The MAX5921/MAX5939 operate from -20V to -80V and are well suited for -48V power systems. These devices are pin compatible with both the LT1640 and LT4250 and provide improved features over these devices. The MAX5921/MAX5939 provide a controlled turn-on to circuit cards preventing damage to board connectors, board components, and preventing glitches on the power-supply rail. The MAX5921/MAX5939 provide undervoltage, overvoltage, and overcurrent protection.

These devices ensure that the input voltage is stable and within tolerance before applying power to the load. Both the MAX5921 and MAX5939 protect a system against overcurrent and short-circuit conditions by turning off the external MOSFET in the event of a fault condition.

The MAX5921/MAX5939 protect against input voltage steps by limiting the load current to a safe level without turning off power to the load.

The device features an open-drain power-good status output, PWRGD or PWRGD for enabling downstream converters (see Selector Guide). A built-in thermal shutdown feature is also included to protect the external MOSFET in case of overheating. The MAX5939 features a latched fault output. The MAX5921 contains built-in autoretry circuitry after a fault condition.

The MAX5921/MAX5939 are available in an 8-pin SO package and operate in the extended -40°C to +85°C temperature range.




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