LTC4353IDE-PBF View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC4353IDE-PBF' PDF : 16 Pages View PDF
LTC4353
Dual Low Voltage
Ideal Diode Controller
Features
n Low Loss Replacement for Power Diodes
n Controls N-Channel MOSFETs
n 0V to 18V Supply ORing or Holdup
n 1µs Gate Turn-On and Turn-Off Time
n Enable Inputs
n MOSFET On-Status Outputs
n 16-Lead MSOP and DFN (4mm × 3mm) Packages
Applications
n Redundant Power Supplies
n Supply Holdup
n High Availability Systems and Servers
n Telecom and Network Infrastructure
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap, PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
7920013 and 8022679.
Description
The LTC®4353 controls external N-channel MOSFETs to
implement an ideal diode function. It replaces two high
power Schottky diodes and their associated heat sinks,
saving power and board area. The ideal diode function
permits low loss power supply ORing and supply holdup
applications.
The LTC4353 regulates the forward-voltage drop across
the MOSFET to ensure smooth current transfer in diode-OR
applications. A fast turn-on reduces the load voltage
droop during supply switchover. If the input supply fails
or is shorted, a fast turn-off minimizes reverse-current
transients.
The controller operates with supplies from 2.9V to 18V. If
both supplies are below 2.9V, an external supply is needed
at the VCC pin. Enable inputs can be used to turn off the
MOSFET and put the controller in a low current state.
Status outputs indicate whether the MOSFETs are on or off.
Typical Application
2.9V TO 18V
2.9V to 18V, 10A Ideal Diode-OR
56nF*
Si4126DY
CPO1
EN1
VIN1 GATE1 OUT1
VCC
0.1µF
GND
LTC4353
ONST1
ONST2
EN2
CPO2 VIN2
56nF*
GATE2 OUT2
MOSFET
ON-STATUS
OUTPUTS
VOUT
10A
2.9V TO 18V
Si4126DY
*OPTIONAL FOR FAST TURN-ON
4353 TA01a
Output Maintained with Failing Input Supply
VIN1
VIN1 = 5.2V
VIN2 = 5V
IL = 8A
CL = 100µF
VIN2
VOUT
5µs/DIV
4353 TA01b
4353f
1
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