ltc4357cms8-trpbf Linear Technology Corporation, ltc4357cms8-trpbf Datasheet

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ltc4357cms8-trpbf

Manufacturer Part Number
ltc4357cms8-trpbf
Description
Positive High Voltage Ideal Diode Controller
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
V
V
48V
48V
INA
INB
Reduces Power Dissipation by Replacing a Power
Schottky Diode with an N-Channel MOSFET
0.5μs Turn-Off Time Limits Peak Fault Current
Wide Operating Voltage Range: 9V to 80V
Smooth Switchover without Oscillation
No Reverse DC Current
Available in 6-Lead (2mm × 3mm) DFN and
8-Lead MSOP Packages
N + 1 Redundant Power Supplies
High Availability Systems
AdvancedTCA Systems
Telecom Infrastructure
Automotive Systems
IN
IN
FDB3632
FDB3632
LTC4357
LTC4357
GND
GND
GATE
GATE
48V, 10A Diode-OR
OUT
OUT
V
V
DD
DD
4357 TA01
V
OUT
TO LOAD
DESCRIPTION
The LTC
ler that drives an external N-channel MOSFET to replace a
Schottky diode. When used in diode-OR and high current
diode applications, the LTC4357 reduces power consump-
tion, heat dissipation, voltage loss and PC board area.
The LTC4357 easily ORs power sources to increase total
system reliability. In diode-OR applications, the LTC4357
controls the forward voltage drop across the MOSFET to
ensure smooth current transfer from one path to the other
without oscillation. If the power source fails or is shorted,
a fast turn-off minimizes reverse current transients.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
®
4357 is a positive high voltage ideal diode control-
Ideal Diode Controller
Positive High Voltage
Power Dissipation vs Load Current
6
5
4
3
2
1
0
0
2
DIODE (MBR10100)
FET (FDB3632)
CURRENT (A)
4
6
POWER
SAVED
8
LTC4357
4357 TA01b
10
4357fb
1

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ltc4357cms8-trpbf Summary of contents

Page 1

... If the power source fails or is shorted, a fast turn-off minimizes reverse current transients. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Power Dissipation vs Load Current ...

Page 2

... LTC4357CDCB#TRMPBF LTC4357CDCB#TRPBF LTC4357IDCB#TRMPBF LTC4357IDCB#TRPBF LTC4357CMS8#PBF LTC4357CMS8#TRPBF LTC4357IMS8#PBF LTC4357IMS8#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. Consult LTC Marketing for information on non-standard lead based fi nish parts. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER I External N-Channel Gate Pull Up Current V GATE(UP) I External N-Channel Gate Pull Down GATE(DOWN) Current in Fault Condition t Gate Turn-Off Time OFF ΔV Source-Drain Regulation ...

Page 4

LTC4357 TYPICAL PERFORMANCE CHARACTERISTICS V Current ( 800 OUT 600 400 200 (V) DD 4357 G01 GATE Current vs Forward Drop ...

Page 5

PIN FUNCTIONS Exposed Pad: Exposed Pad may be left open or connected to GND. GATE: Gate Drive Output. The GATE pin pulls high, enhanc- ing the N-channel MOSFET when the load current creates more than 25mV of voltage drop across ...

Page 6

LTC4357 OPERATION High availability systems often employ parallel-connected power supplies or battery feeds to achieve redundancy and enhance system reliability. ORing diodes have been a popular means of connecting these supplies at the point of load. The disadvantage of this ...

Page 7

APPLICATIONS INFORMATION MOSFET Selection The LTC4357 drives an N-channel MOSFET to conduct the load current. The important features of the MOSFET are on-resistance the maximum drain-source DS(ON) voltage and the gate threshold voltage. DSS Gate drive ...

Page 8

LTC4357 APPLICATIONS INFORMATION V Hold-Up Circuit DD In the event of an input short, parasitic inductance between the input supply of the LTC4357 and the load bypass capacitor may cause V to glitch below its minimum DD operating voltage. This ...

Page 9

APPLICATIONS INFORMATION Layout Considerations Connect the IN and OUT pins as close as possible to the MOSFET’s source and drain pins. Keep the traces to the MOSFET wide and short to minimize resistive losses. See Figure ...

Page 10

LTC4357 TYPICAL APPLICATIONS MMBD1205 MMBD1205 10 –12V Reverse Input Protection Si4874DY V IN2 12V IN GATE OUT LTC4357 V DD GND –48V Reverse Input Protection FDB3672 V IN2 48V IN GATE OUT LTC4357 V DD GND V OUT 12V 10A ...

Page 11

... LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... MOSFET Diode-OR Controller LTC4354 Negative Voltage Diode-OR Controller and Monitor LTC4355 Positive Voltage Diode-OR Controller and Monitor Hot Swap is a trademark of Linear Technology Corporation. Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● Plug-In Card Input Diode for Supply Hold-Up ...

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