LTC4357CDCB#PBF Linear Technology, LTC4357CDCB#PBF Datasheet

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LTC4357CDCB#PBF

Manufacturer Part Number
LTC4357CDCB#PBF
Description
Manufacturer
Linear Technology
Datasheet

Specifications of LTC4357CDCB#PBF

Operating Temperature (max)
70C
Operating Temperature (min)
0C
Pin Count
6
Mounting
Surface Mount
Package Type
DFN EP
Case Length
2mm
Screening Level
Commercial
Lead Free Status / RoHS Status
Compliant

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Part Number
Manufacturer
Quantity
Price
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Part Number:
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Manufacturer:
LT
Quantity:
10 000
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Part Number:
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LT
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Part Number:
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Manufacturer:
LT
Quantity:
205
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
*SEE FIGURES 2 AND 3 FOR ADDITIONAL OPTIONAL COMPONENTS
IN
IN
FDB3632
FDB3632
LTC4357
LTC4357
GND
GND
GATE
GATE
48V, 10A Diode-OR
OUT
OUT
V
V
4357 TA01
DD
DD
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, LTM, Linear Technology and the Linear logo 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
6
5
4
3
2
1
0
Power Dissipation vs Load Current
0
2
DIODE (MBR10100)
FET (FDB3632)
CURRENT (A)
4
6
POWER
SAVED
8
LTC4357
4357 TA01b
10
4357fc
1

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LTC4357CDCB#PBF Summary of contents

Page 1

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

Page 2

LTC4357 ABSOLUTE MAXIMUM RATINGS Supply Voltages IN ............................................................ –1V to 100V OUT, V .............................................. –0.3V to 100V DD Output Voltage GATE (Note 3) ........................ V PIN CONFIGURATION TOP VIEW OUT GATE 3 DCB PACKAGE 6-LEAD (2mm ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V Operating Supply Range DD I Supply Current Pin Current IN I OUT Pin Current OUT ΔV External N-Channel Gate Drive GATE (V – V ...

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 Load Sharing The application in Figure 1 combines the outputs of multiple, redundant supplies using a simple technique known as droop sharing. Load current is fi rst taken from the highest output, with the low outputs contributing as ...

Page 8

LTC4357 APPLICATIONS INFORMATION INPUT PARASITIC INDUCTANCE + – INPUT SBR1V- SHORT 15DSA Figure 2. Reverse Recovery Produces Inductive Spikes at the IN and OUT Pin. The Polarity of Step Recovery Spikes is Shown Across Parasitic Inductances ...

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 14V 100W SHUNT SOLAR REGULATOR PANEL –12V Reverse Input Protection M1 Si4874DY V IN 12V IN GATE LTC4357 GND D1 MMBD1205 V 48V 5A 10 Solar Panel Charging a Battery M1 FDB3632 R1 100Ω IN GATE V ...

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

... Ideal Diode Controller with Monitor 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. 12 Linear Technology Corporation 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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