IC MON DIODE-OR CTRLR NEG 8DFN

 

LTC4354CDDB#TR

Manufacturer Part NumberLTC4354CDDB#TR
DescriptionIC MON DIODE-OR CTRLR NEG 8DFN
ManufacturerLinear Technology
LTC4354CDDB#TR datasheets

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Specifications of LTC4354CDDB#TR

Applications-48V Dist Power Systems, AdvancedTCA ® SystemsFet TypeN-Channel
Number Of Outputs2Internal Switch(s)No
Delay Time - Off700nsVoltage - Supply4.5 V ~ 11.75 V
Current - Supply1.2mAOperating Temperature0°C ~ 70°C
Mounting TypeSurface MountPackage / Case8-DFN
Lead Free Status / RoHS StatusContains lead / RoHS non-compliantDelay Time - On-
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FEATURES
■
Controls N-Channel MOSFETs
■
Replaces Power Schottky Diodes
■
Less Than 1µs Turn-off Time Limits Peak
Fault Current
■
80V Operation
■
Smooth Switchover Without Oscillation
■
No Reverse DC Current
■
Fault Output
■
Selectable Fault Thresholds
Available in 8-Pin (3mm × 2mm) DFN and 8-Pin SO
■
Packages
U
APPLICATIO S
®
■
AdvancedTCA
Systems
■
–48V Distributed Power Systems
■
Computer Systems/Servers
■
Telecom Infrastructure
■
Optical Networks
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
U
TYPICAL APPLICATIO
–48V Diode-OR
–48V_RTN
12k
V
CC
LTC4354
DA
DB
GA
GB
2k
2k
V
= –48V
A
IRF3710
V
= –48V
B
IRF3710
DESCRIPTIO
®
The LTC
4354 is a negative voltage diode-OR controller
that drives two external N-channel MOSFETs. It replaces
two Schottky diodes and the associated heatsink, saving
power and area. The power dissipation is greatly reduced
by using N-channel MOSFETs as the pass transistors.
Power sources can easily be ORed together to increase
total system power and reliability.
When first powered up, the MOSFET body diode conducts
the load current until the pass transistor is turned on. The
LTC4354 servos the voltage drop across the pass transis-
tors to ensure smooth transfer of current from one tran-
sistor to the other without oscillation.
The MOSFETs are turned off in less than 1µs whenever the
corresponding power source fails or is shorted. Fast turn-
off prevents the reverse current from reaching a level that
could damage the pass transistors.
A fault detection circuit with an open drain output capable
of driving an LED or opto-coupler indicates either MOSFET
short, MOSFET open or supply failed.
33k
LOAD
FAULT
V
SS
LED
1µF
4354 TA01
LTC4354
Negative Voltage
Diode-OR Controller
and Monitor
U
Power Dissipation vs Load Current
6
5
DIODE (MBR10100)
4
POWER
3
SAVED
2
1
FET (IRF3710)
0
0
2
4
6
8
10
CURRENT (A)
4354 TA01b
4354fb
1

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LTC4354CDDB#TR Summary of contents

  • Page 1

    ... Systems ■ –48V Distributed Power Systems ■ Computer Systems/Servers ■ Telecom Infrastructure ■ Optical Networks , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO –48V Diode-OR –48V_RTN 12k V CC LTC4354 ...

  • Page 2

    LTC4354 ABSOLUTE AXI U RATI GS (Note 1) I (100µs duration) ............................................. 50mA CC Output Voltages GA, GB ....................................... –0. FAULT .................................................... –0. Input Voltages DA, DB .................................................. –0.3V to 80V Input Current ...

  • Page 3

    ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER V Internal Shunt Regulator Voltage Z ∆V Internal Shunt Regulator Load Regulation Z V Operating Voltage Range Supply Current GATE Pins Output High ...

  • Page 4

    LTC4354 W U TYPICAL PERFOR A CE CHARACTERISTICS Shunt Regulator Voltage vs Input Current 12.0 11.5 11.0 10.5 10 (mA) CC 4354 G01 Source Drain Sense Voltage vs Temperature ...

  • Page 5

    CTIO S DA, DB (Pins 1, 8): Drain Voltage Sense Inputs. These pins sense source-drain voltage drop across the N-Chan- nel MOSFETs. An external resistor is recommended to protect these pins from transient voltages exceeding ...

  • Page 6

    LTC4354 DIAGRA V – GATE U OPERATIO High availability systems often employ parallel-connected power supplies or battery feeds to achieve redundancy and enhance system reliability. ORing diodes have been a ...

  • Page 7

    U U APPLICATIO S I FOR ATIO Input Power Supply The power supply for the device is derived from –48_RTN through an external current limiting resistor (R internal shunt regulator clamps the voltage at V 11V. A 1µF decoupling capacitor ...

  • Page 8

    LTC4354 U U APPLICATIO S I FOR ATIO System Power Supply Failure LTC4354 automatically supplies load current from the system supply with the more negative input potential. If this supply is shorted to the return side, a large reverse current ...

  • Page 9

    U U APPLICATIO S I FOR ATIO The worst case power dissipation in R − 315 . Choose a 12k 0.5W resistor or use ...

  • Page 10

    LTC4354 U U APPLICATIO S I FOR ATIO –48V_RTN V = –48V –48V B GND V = –12V –12V –36V to –72V/20A High Current with Parallel FETs R IN1 10k ...

  • Page 11

    ... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

  • Page 12

    ... Hot Swap Controller with Sequencer LT4351 MOSFET Diode-OR Controller LTC4412 Low Loss PowerPath™ Controller in ThinSOT™ Hot Swap, PowerPath and ThinSOT are trademarks of Linear Technology Corporation. Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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