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LTC4354IS8 Datasheet

  • LTC4354IS8

  • Negative Voltage Diode-OR Controller and Monitor

  • 12頁(yè)

  • LINER

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LTC4354
Negative Voltage
Diode-OR Controller
and Monitor
FEATURES
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DESCRIPTIO
Controls N-Channel MOSFETs
Replaces Power Schottky Diodes
1碌s 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
脳
2mm) DFN and 8-Pin SO
Packages
The LTC
廬
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 1碌s 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
AdvancedTCA is a registered trademark of the PIC Industrial Computer Manufacturers Group.
APPLICATIO S
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AdvancedTCA
廬
Systems
鈥?8V Distributed Power Systems
Computer Systems/Servers
Telecom Infrastructure
Optical Networks
TYPICAL APPLICATIO
鈥?8V_RTN
12k
鈥?8V Diode-OR
6
5
POWER DISSIPATION (W)
33k
V
CC
LTC4354
DA
2k
V
A
= 鈥?8V
IRF3710
V
B
= 鈥?8V
IRF3710
DB
2k
GA
GB
FAULT
V
SS
1碌F
LED
4354 TA01
Power Dissipation vs Load Current
4
3
2
1
FET (IRF3710)
0
0
2
4
6
CURRENT (A)
8
10
4354 TA01b
LOAD
U
DIODE (MBR10100)
POWER
SAVED
4354f
U
U
1

LTC4354IS8 產(chǎn)品屬性

  • LTC4354

  • 100

  • 集成電路 (IC)

  • PMIC - O 圈控制器

  • -

  • -48V Dist 電源系統(tǒng)，AdvancedTCA ? 系統(tǒng)

  • N 溝道

  • 2

  • 無(wú)

  • -

  • 700ns

  • 4.5 V ~ 11.75 V

  • 1.2mA

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 8-SOIC

  • 管件

  • DC852A-ND - BOARD DEMO FOR LTC4354

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