LTC4357HMS8#PBF Linear Technology, LTC4357HMS8#PBF Datasheet

IC CTRLR IDEAL DIODE 8-MSOP

LTC4357HMS8#PBF

Manufacturer Part Number
LTC4357HMS8#PBF
Description
IC CTRLR IDEAL DIODE 8-MSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LTC4357HMS8#PBF

Applications
Redundant Power Supplies, Telecom Infrastructure
Fet Type
N-Channel
Number Of Outputs
1
Internal Switch(s)
No
Delay Time - Off
300ns
Voltage - Supply
9 V ~ 80 V
Current - Supply
500µA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Delay Time - On
-

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LT
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Features
applications
n
n
n
n
n
n
n
n
n
n
n
typical application
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
V
V
48V
48V
INA
INB
*SEE FIGURES 2 AND 3 FOR ADDITIONAL OPTIONAL COMPONENTS
IN
IN
FDB3632
FDB3632
LTC4357
LTC4357
GATE
GATE
GND
GND
48V, 10A Diode-OR
OUT
OUT
4357 TA01
V
V
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 and
Hot Swap is a trademark 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
4357fd


Related parts for LTC4357HMS8#PBF

LTC4357HMS8#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 and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Power Dissipation vs Load Current ...

Page 2

... JMAX JA EXPOSED PAD (PIN 7) PCB GND CONNECTION OPTIONAL orDer inForMation LEAD FREE FINISH TAPE AND REEL LTC4357CMS8#PBF LTC4357CMS8#TRPBF LTC4357IMS8#PBF LTC4357IMS8#TRPBF LTC4357HMS8#PBF LTC4357HMS8#TRPBF LTC4357MPMS8#PBF LTC4357MPMS8#TRPBF LEAD BASED FINISH TAPE AND REEL LTC4357MPMS8 LTC4357MPMS8#TR LEAD FREE FINISH TAPE AND REEL (MINI) TAPE AND REEL ...

Page 3

T SYMBOL PARAMETER V Operating Supply Range DD I Supply Current Pin Current IN I OUT Pin Current OUT DV External N-Channel Gate Drive GATE (V – ...

Page 4

LTC4357 typical perForMance characteristics GATE Current vs Forward Drop ( GATE 2.5V GATE 0 –25 –50 – 100 V (mV) SD 4357 G04 FET Turn-Off Time vs GATE Capacitance 500 V ...

Page 5

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

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 first taken from the highest output, with the low outputs contributing as the ...

Page 8

LTC4357 applications inForMation INPUT PARASITIC INDUCTANCE + – INPUT SBR1U- SHORT 150SA 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

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 0 Solar Panel Charging a Battery M1 FDB3632 R1 100 IN GATE V ...

Page 11

Description 0.70 0.05 1.65 0.05 3.55 0.05 (2 SIDES) 2.15 0.05 0.25 0.05 0.50 BSC 1.35 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (TBD) ...

Page 12

LTC4357 package Description 0.889 0.127 (.035 .005) 5.23 3.20 – 3.45 (.206) (.126 – .136) MIN 0.42 0.038 0.65 (.0165 .0015) (.0256) TYP BSC RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION ...

Page 13

... Revised Figure 2 and Figure 4 in Applications Information section 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 14

... Controls Two N-Channel MOSFETs, 0.5µs Turn-Off, 80V Operation Wide Operation Range 80V, Reverse Input Protection to –60V, Adjustable Output Clamp Voltage www.linear.com l Hot Swap V OUT1 CONTROLLER + C HOLDUP SMAT70A GND Hot Swap V OUT2 CONTROLLER + C HOLDUP SMAT70A GND 4357 TA06 LT 0910 REV D • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 2007 4357fd ...

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