LTC4359
Ideal Diode Controller with
Reverse Input Protection
FEATURES DESCRIPTION
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Reduces Power Dissipation by Replacing a Power
The LTC 4359 is a positive high voltage ideal diode control-
Schottky Diode
ler that drives an external N-channel MOSFET to replace
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Wide Operating Voltage Range: 4V to 80V
a Schottky diode. It controls the forward-voltage drop
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Reverse Input Protection to 40V
across the MOSFET to ensure smooth current delivery
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Low 9A Shutdown Current
without oscillation even at light loads. If a power source
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Low 150A Operating Current
fails or is shorted, a fast turn-off minimizes reverse cur-
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Smooth Switchover without Oscillation
rent transients. A shutdown mode is available to reduce
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Controls Single or Back-to-Back N-Channel MOSFETs
the quiescent current to 9A for load switch and 14A for
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Available in 6-Pin (2mm 3mm) DFN, 8-Lead MSOP
ideal diode applications.
and 8-Lead SO Packages
When used in high current diode applications, the LTC4359
reduces power consumption, heat dissipation, voltage loss
and PC board area. With its wide operating voltage range,
APPLICATIONS
the ability to withstand reverse input voltage, and high
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Automotive Battery Protection
temperature rating, the LTC4359 satisfies the demanding
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Redundant Power Supplies
requirements of both automotive and telecom applications.
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Supply Holdup
The LTC4359 also easily ORs power sources in systems
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Telecom Infrastructure
with redundant supplies.
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Computer Systems/Servers
All registered trademarks and trademarks are the property of their respective owners.
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Solar Systems
TYPICAL APPLICATION
12V, 20A Automotive Reverse-Battery Protection Power Dissipation vs Load Current
10
BSC028N06NS
V
IN
V TO LOAD
OUT
12V
SMAT70A
8
70V
SCHOTTKY DIODE (SBG2040CT)
SMAJ24A
IN SOURCE GATE OUT
24V
47nF
6
SHDN
LTC4359
POWER
4
V
SAVED
SS
4359 TA01
2
1k
MOSFET (BSC028N06NS)
0
0 10 15 20
5
CURRENT (A)
4359 TA01a
Rev D
1
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POWER DISSIPATION (W)LTC4359
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Operating Ambient Temperature Range
IN, SOURCE, SHDN ................................... 40V to 100V
LTC4359C ................................................ 0C to 70C
OUT (Note 3) ................................................2V to 100V
LTC4359I .............................................40C to 85C
IN OUT ..................................................100V to 100V
LTC4359H .......................................... 40C to 125C
IN SOURCE .................................................1V to 80V
Storage Temperature Range .................. 65C to 150C
GATE SOURCE (Note 4) .........................0.3V to +10V
Lead Temperature (Soldering, 10 sec)
MS, SO Packages .............................................300C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
TOP VIEW
GATE 1 8 OUT GATE 1 8 OUT
OUT 1 6 V
SS
SOURCE 2 7 NC
SOURCE 2 7 NC
7
GATE 2 5 SHDN
NC 3 6 V
SS
IN 4 5 SHDN
NC 3 6 V
SS
SOURCE 4 IN
3
MS8 PACKAGE
IN 4 5 SHDN
8-LEAD PLASTIC MSOP
DCB PACKAGE
T = 150C, = 163C/W
S8 PACKAGE
JMAX JA
6-LEAD (2mm 3mm) PLASTIC DFN
8-LEAD PLASTIC SO
T = 150C, = 64C/W
JMAX JA
T = 150C, = 130C/W
JMAX JA
EXPOSED PAD (PIN 7) PCB V CONNECTION OPTIONAL
SS
ORDER INFORMATION