LT4320/LT4320-1
Ideal Diode Bridge
Controller
Features Description
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Maximizes Power Efficiency The LT 4320/LT4320-1 are ideal diode bridge controllers
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Eliminates Thermal Design Problems that drive four N-channel MOSFETs, supporting voltage
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DC to 600Hz rectification from DC to 600Hz typical. By maximizing
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available voltage and reducing power dissipation (see
9V to 72V Operating Voltage Range
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thermograph comparison below), the ideal diode bridge
I = 1.5mA (Typical)
Q
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simplifies power supply design and reduces power supply
Maximizes Available Voltage
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cost, especially in low voltage applications.
Available in 8-Lead (3mm 3mm) DFN, 12-Lead
MSOP and 8-Lead PDIP Packages
An ideal diode bridge also eliminates thermal design
problems, costly heat sinks, and greatly reduces PC board
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area. The LT4320s internal charge pump supports an all-
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Security Cameras NMOS design, which eliminates larger and more costly
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Terrestrial or Airborne Power Distribution Systems PMOS switches. If the power source fails or is shorted, a
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Power-over-Ethernet Powered Device with a fast turn-off minimizes reverse current transients.
Secondary Input
The LT4320 is designed for DC to 60Hz typical voltage
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Polarity-Agnostic Power Input
rectification, while the LT4320-1 is designed for DC to
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Diode Bridge Replacement
600Hz typical voltage rectification. Higher frequencies of
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
operation are possible depending on MOSFET size and
Technology Corporation. All other trademarks are the property of their respective owners.
Patent pending.
operating load current.
t a
Thermograph of Passive Diode Bridge
+
Temperature Rise
DIODE
OUTP
TG1 TG2
MOSFET SBM
CURRENT 2.5m 1040
LT4320
4320 TA01b
OUTPUT SBM1040 (4)
2A 0.6C 15C
~ IN1 IN2
9V TO 72V
4A 3.5C 32C
Thermograph of LT4320
BG2 BG1 Driving Four MOSFETs
6A 6.7C 49C
OUTN
8A 11C 66C
INPUT
10A 16C 84C
DC TO 600Hz (TYP)
DC Input, On Same PCB
~
4320 TA01a
4320 TA01c
LT4320+2.5m FET (4)
CONDITIONS: 24V AC , 9.75A DC LOAD ON SAME PCB
IN
4320fb
1
For more information www.linear.com/LT4320
pplication ypical
pplicationsLT4320/LT4320-1
a MaxiMMu r (Notes 1, 2)
Supply Voltages Operating Junction Temperature Range
IN1, IN2 .................................................... 3V to 80V LT4320I ................................................40C to 85C
OUTP ..................................................... 0.3V to 80V LT4320H ............................................ 40C to 125C
Output Voltages (Note 3) LT4320MP ......................................... 55C to 125C
BG1, BG2, TG1, TG2 ............................... 0.3V to 80V Storage Temperature Range .................. 65C to 150C
TG1-IN1, TG2-IN2 ....................................0.3V to 12V Lead Temperature (Soldering, 10 sec)
MSE, PDIP Packages ........................................300C
p Fc
TOP VIEW
TOP VIEW
TOP VIEW
IN2 1 12 IN1
IN2 1 8 IN1
TG2 2 11 TG1
IN2 1 8 IN1
TG2 2 7 TG1
NC 3 10 NC
9 13
TG2 2 TG1
7
NC 4 9 OUTP
BG2 3 6 OUTP
5
BG2 8 NC
BG2 3 6 OUTP
BG1 OUTN
4 5
6
BG1 7 OUTN
BG1 OUTN
4 5
MSE PACKAGE
DD PACKAGE
12-LEAD PLASTIC MSOP N8 PACKAGE
8-LEAD (3mm 3mm) PLASTIC DFN
8-LEAD PLASTIC DIP
T = 150C, = 10C/W
JMAX JC
T = 150C, = 5.5C/W
JMAX JC
EXPOSED PAD (PIN 13) MUST BE T = 150C, = 45C/W
JMAX JC
EXPOSED PAD (PIN 9) MUST BE
CONNECTED TO OUTN (PIN 7)
CONNECTED TO OUTN (PIN 5)
Dro Fni M
OPERATING JUNCTION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT4320IDD#PBF LT4320IDD#TRPBF LGCV 8-Lead (3mm 3mm) Plastic DFN 40C to 85C
LT4320HDD#PBF LT4320HDD#TRPBF LGCV 8-Lead (3mm 3mm) Plastic DFN 40C to 125C
LT4320IDD-1#PBF LT4320IDD-1#TRPBF LGCW 8-Lead (3mm 3mm) Plastic DFN 40C to 85C
LT4320HDD-1#PBF LT4320HDD-1#TRPBF LGCW 8-Lead (3mm 3mm) Plastic DFN 40C to 125C
LT4320IMSE#PBF LT4320IMSE#TRPBF 4320 12-Lead Plastic MSOP 40C to 85C
LT4320HMSE#PBF LT4320HMSE#TRPBF 4320 12-Lead Plastic MSOP 40C to 125C
LT4320MPMSE#PBF LT4320MPMSE#TRPBF 4320 12-Lead Plastic MSOP 55C to 125C
LT4320IMSE-1#PBF LT4320IMSE-1#TRPBF 43201 12-Lead Plastic MSOP 40C to 85C
LT4320HMSE-1#PBF LT4320HMSE-1#TRPBF 43201 12-Lead Plastic MSOP 40C to 125C
LT4320MPMSE-1#PBF LT4320MPMSE-1#TRPBF 43201 12-Lead Plastic MSOP 55C to 125C
LT4320IN8#PBF NA LT4320N8 8-Lead PDIP 40C to 85C
LT4320HN8#PBF NA LT4320N8 8-Lead PDIP 40C to 125C
LT4320IN8-1#PBF NA LT4320N8-1 8-Lead PDIP 40C to 85C
LT4320HN8-1#PBF NA LT4320N8-1 8-Lead PDIP 40C to 125C
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 nonstandard lead based finish parts.
For more information on lead free part marking, go to: