LTC4371
Dual Negative Voltage
Ideal Diode-OR Controller
and Monitor
Fea T Descrip T
n
Controls N-Channel MOSFETs to Replace Power The LTC 4371 is a two-input negative voltage ideal diode-OR
Schottky Diodes controller that drives external N-channel MOSFETs as a low
n
Low 15mV Forward Voltage Minimizes Dissipation dissipation alternative to Schottky diodes in high power 48V
n
Withstands > 300V Transients systems. Low power dissipation and voltage loss eliminates
n
Fast Turn-Off: <220ns the need for heatsinks and reduces PC board area. Power
n
Shunt Regulated for High Voltage Applications sources can be easily ORed together to increase total system
n
4.5V Minimum Operation power and reliability.
n
Low 350A Quiescent Current
The LTC4371 tolerates 300V transients such as those
n
5mA Gate Pull-Up for 60Hz Applications
experienced during lightning-induced surges and input
n
High Impedance Drain Pins: <10A Leakage
supply short-circuit events. The internal shunt regulator
n
Open Fuse and MOSFET Monitor
and low 350A quiescent current allow the use of a large
n
10-Pin (3mm 3mm) DFN and MSOP Packages
value dropping resistor to protect the supply pin against
high voltage transients, while the high impedance drain
pins can be similarly protected by high value series resis-
a T
tors without compromising diode operation.
n
48V Telecom Power
The 220ns reverse current turn-off is achieved by a powerful
n
AdvancedTCA Systems
2A gate driver with low propagation delay, thereby minimizing
n
Network Routers and Switches
peak reverse current under catastrophic fault conditions. Open
n
Computer Systems and Servers
MOSFET and fuse faults are indicated at the FAULTB pin, which
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
is capable of sinking 5mA to drive an LED or opto isolator.
Technology Corporation. All other trademarks are the property of their respective owners.
Typical a T
RTN
48V/50A Diode-OR
R
Z
30k
Power Dissipation vs. Load Current
R1 vs Load Current
33k
40
C1
V
V
Z DD
2.2F
LTC4371 FAULTB
30
DA DB GA GB SA SB V
SCHOTTKY DIODE
SS
D1
(SBRT60U100CT)
GREEN LED =
R
R
DA DB
MOSFETS GOOD
20
20k 20k
V V
A POWER
OUT
36V TO M1*
50A LOAD
SAVED
72V
10
M3*
MOSFET
V
B
(2IPT020N10N3)
M2*
36V TO
4371 TA01a
0
72V
0 10 20 30 40 50
*M1-M4: IPT020N10N3
M4*
CURRENT (A)
4371 TA01b
4371f
1
For more information www.linear.com/LTC4371
POWER DISSIPATION (W)
ion pplica
ions pplica
ion uresLTC4371
a Te Maxi Mu M r a T
(Notes 1, 2)
Output Voltages
Supply Voltage V .................................... 0.3V to 17V
DD
GA, GB ................................................... 0.3V to V
DD
Input Voltage
FAULTB .................................................. 0.3V to 17V
DA, DB (Note 3) .................................... 40V to 100V
Operating Ambient Temperature Range
SA, SB .................................................. 0.3V to 0.3V
LTC4371C ................................................ 0C to 70C
DC Currents
LTC4371I .............................................40C to 85C
V ......................................................................20mA
Z
Storage Temperature Range .................. 65C to 150C
DA, DB ............................................................... 1mA
Lead Temperature (Soldering, 10 sec)
Single Pulse Current (6ms) DA, DB ........................10mA
MS Package ......................................................300C
p in c F T
TOP VIEW
TOP VIEW
DA 1 10 DB
DA 1 10 DB
GA 2 9 GB
GA 2 9 GB
11
SA 3 8 SB
SA 3 8 SB
V 4 7 FAULTB
Z
V 4 7 FAULTB
Z
V 5 6 V
DD SS
V 5 6 V
DD SS
MS PACKAGE
10-LEAD PLASTIC MSOP
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
T = 125C, = 160C/W
T = 125C, = 43C/W (NOTE 4) JMAX JA
JMAX JA
EXPOSED PAD (PIN 11) PCB V CONNECTION OPTIONAL
SS
o r Der i n F Ma T (