LT4320_15 Datasheet, PDF (1/14 Pages) Linear Technology – Ideal Diode Bridge Controller

Features
n _{Maximizes Power Efficiency}
n _{Eliminates Thermal Design Problems}
n _{DC to 600Hz}
n _{9V to 72V Operating Voltage Range}
n _{IQ = 1.5mA (Typical)}
n _{Maximizes Available Voltage}
n _{Available in 8-Lead (3mm × 3mm) DFN, 12-Lead}
MSOP and 8-Lead PDIP Packages
Applications
n _{Security Cameras}
n _{Terrestrial or Airborne Power Distribution Systems}
n _{Power-over-Ethernet Powered Device with a}
Secondary Input
n _{Polarity-Agnostic Power Input}
n _{Diode Bridge Replacement}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Patent pending.
LT4320/LT4320-1
Ideal Diode Bridge
Controller
Description
The LT^®4320/LT4320-1 are ideal diode bridge controllers
that drive four N-channel MOSFETs, supporting voltage
rectification from DC to 600Hz typical. By maximizing
available voltage and reducing power dissipation (see
thermograph comparison below), the ideal diode bridge
simplifies power supply design and reduces power supply
cost, especially in low voltage applications.
An ideal diode bridge also eliminates thermal design
problems, costly heat sinks, and greatly reduces PC board
area. The LT4320’s internal charge pump supports an all-
NMOS design, which eliminates larger and more costly
PMOS switches. If the power source fails or is shorted, a
fast turn-off minimizes reverse current transients.
The LT4320 is designed for DC to 60Hz typical voltage
rectification, while the LT4320-1 is designed for DC to
600Hz typical voltage rectification. Higher frequencies of
operation are possible depending on MOSFET size and
operating load current.
Typical Application
Thermograph of Passive Diode Bridge
~
INPUT
DC TO 600Hz (TYP)
~
OUTP
TG1
TG2
LT4320
IN1
IN2
BG2
BG1
OUTN
+
OUTPUT
9V TO 72V
–
4320 TA01a
SBM1040 (×4)
4320 TA01b
Thermograph of LT4320
Driving Four MOSFETs
Temperature Rise
DIODE
MOSFET SBM
CURRENT 2.5mΩ 1040
2A
0.6°C 15°C
4A
3.5°C 32°C
6A
6.7°C 49°C
8A
11°C 66°C
10A
16°C 84°C
DC Input, On Same PCB
LT4320+2.5mΩ FET (×4)
4320 TA01c
CONDITIONS: 24V AC_IN, 9.75A DC LOAD ON SAME PCB
For more information www.linear.com/LT4320
4320fb
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