LTC4358
5A Ideal Diode
FEATURES
DESCRIPTION
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The LTC®4358 is a 5A ideal diode that uses an internal
20mΩ N-channel MOSFET to replace a Schottky diode
when used in diode-OR and high current diode applications. The LTC4358 reduces power consumption, heat
dissipation, and PC board area.
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Replaces a Power Schottky Diode
Internal 20mΩ N-Channel MOSFET
0.5μs Turn-Off Time Limits Peak Fault Current
Operating Voltage Range: 9V to 26.5V
Smooth Switchover without Oscillation
No Reverse DC Current
Available in 14-Pin (4mm × 3mm) DFN and
16-Lead TSSOP Packages
The LTC4358 easily ORs power supplies together to increase total system reliability. In diode-OR applications,
the LTC4358 regulates the forward voltage drop across
the internal MOSFET to ensure smooth current transfer
from one path to the other without oscillation. If the power
source fails or is shorted, a fast turnoff minimizes reverse
current transients.
APPLICATIONS
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N+1 Redundant Power Supplies
High Availability Systems
Telecom Infrastructure
Automotive Systems
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
12V, 5A Diode-OR
Power Dissipation vs Load Current
3.0
IN
DRAIN
2.5
OUT
LTC4358
VDD
VOUT TO
5A LOAD
GND
POWER DISSIPATION (W)
VINA = 12V
DIODE (B530C)
2.0
1.5
POWER SAVED
1.0
0.5
VINB = 12V
IN
DRAIN
FET (LTC4358)
0
OUT
LTC4358
VDD
0
2
4
CURRENT (A)
6
8
4358 TA01b
GND
4358 TA01
4358fa
1
