LTC4352
Low Voltage Ideal Diode
Controller with Monitoring
Fea T Descrip T
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Low Loss Replacement for Power Diode
The LTC 4352 creates a near-ideal diode using an external
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Controls N-Channel MOSFET
N-channel MOSFET. It replaces a high power Schottky diode
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0V to 18V Supply ORing or Holdup
and the associated heat sink, saving power and board area.
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0.5s Turn-On and Turn-Off Time
The ideal diode function permits low loss power ORing
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Undervoltage and Overvoltage Protection
and supply holdup applications.
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Open MOSFET Detect
The LTC4352 regulates the forward voltage drop across
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Status and Fault Outputs
the MOSFET to ensure smooth current transfer in diode-
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Hot Swappable
OR applications. A fast turn-on reduces the load voltage
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Reverse Current Enable Input
droop during supply switch-over. If the input supply fails
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12-Pin MSOP and DFN (3mm 3mm) Packages
or is shorted, a fast turn-off minimizes reverse currents.
The controller operates with supplies from 2.9V to 18V.
a T
For lower voltages, an external supply is needed at the
V pin. Power passage is disabled during undervoltage
CC
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Redundant Power Supplies
or overvoltage conditions. The controller also features an
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Supply Holdup
open MOSFET detect circuit that flags excessive voltage
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Telecom Infrastructure
drop across the pass transistor in the on state. A REV pin
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Computer Systems and Servers
enables reverse current, overriding the diode behavior
when desired.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Typical a T
2.9V to 18V Ideal Diode Power Dissipation vs Load Current
4.0
Si7336ADP
3.5
2.9V TO 18V TO LOAD
0.1F*
3.0
DIODE (SBG1025L)
2.5
CPO SOURCE V GATE OUT
IN
2.0
MOSFET ON
V
STATUS
CC
POWER
STATUS
0.1F 1.5
UV SAVED
LTC4352
OV
FAULT FAULT 1.0
REV
GND
0.5
4352 TA01
MOSFET (Si7336ADP)
*OPTIONAL 0
0 2 4 6 8 10
LOAD CURRENT (A)
4352 TA01b
4352fa
1
POWER DISSIPATION (W)
ion pplica
ions pplica
ion uresLTC4352
a Te Maxi Mu M r a T
(Notes 1, 2)
FAULT, STATUS Currents ..........................................5mA
V , SOURCE Voltages ...................................2V to 24V
IN
Operating Ambient Temperature Range
V Voltage .................................................. 0.3V to 7V
CC
LTC4352C ................................................ 0C to 70C
OUT Voltage ...................................................2V to 24V
LTC4352I .............................................40C to 85C
CPO, GATE Voltages (Note 3) ..................... 0.3V to 30V
LTC4352H .......................................... 40C to 150C
CPO D.C. Current ...................................................10mA
Storage Temperature Range .................. 65C to 150C
UV, OV, REV Voltages ................................ 0.3V to 24V
Lead Temperature (Soldering, 10 sec)
FAULT, STATUS Voltages ............................ 0.3V to 24V
MS Package ......................................................300C
p in c F T
TOP VIEW
TOP VIEW
V 1 12 SOURCE
IN
1 SOURCE
V 12
IN
V 2 11 GATE
CC
V 2 11 GATE
CC
3 10 CPO
UV
UV 3 10 CPO
13
4 9 GND OV 4 9 GND
OV
STATUS 5 8 OUT
5 OUT
STATUS 8
FAULT 6 7 REV
6 7 REV
FAULT
MS PACKAGE
DD PACKAGE
12-LEAD PLASTIC MSOP
12-PIN (3mm 3mm) PLASTIC DFN
T = 150C, = 164C/W
T = 150C, = 43C/W JMAX JA
JMAX JA
EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL
o r Der i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4352CDD#PBF LTC4352CDD#TRPBF LDPJ 12-Pin (3mm 3mm) Plastic DFN 0C to 70C
LTC4352IDD#PBF LTC4352IDD#TRPBF LDPJ 12-Pin (3mm 3mm) Plastic DFN 40C to 85C
LTC4352HDD#PBF LTC4352HDD#TRPBF LDPJ 12-Pin (3mm 3mm) Plastic DFN 40C to 150C
LTC4352CMS#PBF LTC4352CMS#TRPBF 4352 12-Lead Plastic MSOP 0C to 70C
LTC4352IMS#PBF LTC4352IMS#TRPBF 4352 12-Lead Plastic MSOP 40C to 85C
LTC4352HMS#PBF LTC4352HMS#TRPBF 4352 12-Lead Plastic MSOP 40C to 150C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: