Diode-OR Controller/Monitor. LTC4371 Datasheet

LTC4371 Controller/Monitor. Datasheet pdf. Equivalent

LTC4371 Datasheet
Recommendation LTC4371 Datasheet
Part LTC4371
Description Dual Negative Voltage Ideal Diode-OR Controller/Monitor
Feature LTC4371; Features nn Controls N-Channel MOSFETs to Replace Power Schottky Diodes nn Low 15mV Forward Voltage .
Manufacture Linear Technology
Datasheet
Download LTC4371 Datasheet




Linear Technology LTC4371
Features
nn Controls N-Channel MOSFETs to Replace Power
Schottky Diodes
nn Low 15mV Forward Voltage Minimizes Dissipation
nn Withstands > ±300V Transients
nn Fast Turn-Off: <220ns
nn Shunt Regulated for High Voltage Applications
nn 4.5V Minimum Operation
nn Low 350μA Quiescent Current
nn 5mA Gate Pull-Up for 60Hz Applications
nn High Impedance Drain Pins: <10μA Leakage
nn Open Fuse and MOSFET Monitor
nn 10-Pin (3mm × 3mm) DFN and MSOP Packages
Applications
nn –48V Telecom Power
nn AdvancedTCA Systems
nn Network Routers and Switches
nn Computer Systems and Servers
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.
LTC4371
Dual Negative Voltage
Ideal Diode-OR Controller
and Monitor
Description
The LTC®4371 is a two-input negative voltage ideal diode-OR
controller that drives external N-channel MOSFETs as a low
dissipation alternative to Schottky diodes in high power –48V
systems. Low power dissipation and voltage loss eliminates
the need for heatsinks and reduces PC board area. Power
sources can be easily ORed together to increase total system
power and reliability.
The LTC4371 tolerates ±300V transients such as those
experienced during lightning-induced surges and input
supply short-circuit events. The internal shunt regulator
and low 350μA quiescent current allow the use of a large
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-
tors without compromising diode operation.
The 220ns reverse current turn-off is achieved by a powerful
2A gate driver with low propagation delay, thereby minimizing
peakreversecurrentundercatastrophicfaultconditions.Open
MOSFET and fuse faults are indicated at the FAULTB pin, which
is capable of sinking 5mA to drive an LED or opto isolator.
Typical Application
RTN
RZ
30k
VZ VDD
C1
2.2μF
R1
33k
LTC4371
FAULTB
VA
–36V TO
–72V
VB
–36V TO
–72V
DA DB
GA
RDA RDB
20k 20k
M1*
GB SA SB VSS
D1
GREEN LED =
MOSFETS GOOD
VOUT
50A LOAD
M3*
M2*
M4*
*M1-M4: IPT020N10N3
4371 TA01a
–48V/50A Diode-OR
PowvserLDoaisdsiCpuartrieonntvs. Load Current
40
30
SCHOTTKY DIODE
(SBRT60U100CT)
20
POWER
SAVED
10
MOSFET
(2–IPT020N10N3)
0
0 10 20 30 40 50
CURRENT (A)
4371 TA01b
For more information www.linear.com/LTC4371
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Linear Technology LTC4371
LTC4371
Absolute Maximum Ratings
(Notes 1, 2)
Supply Voltage VDD..................................... –0.3V to 17V
Input Voltage
DA, DB (Note 3)..................................... –40V to 100V
SA, SB................................................... –0.3V to 0.3V
DC Currents
VZ.......................................................................20mA
DA, DB................................................................ ±1mA
Single Pulse Current (6ms) DA, DB.........................10mA
Output Voltages
GA, GB.................................................... –0.3V to VDD
FAULTB................................................... –0.3V to 17V
Operating Ambient Temperature Range
LTC4371C................................................. 0°C to 70°C
LTC4371I..............................................–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS Package....................................................... 300°C
Pin Configuration
TOP VIEW
DA 1
GA 2
SA 3
VZ 4
VDD 5
10 DB
9 GB
11 8 SB
7 FAULTB
6 VSS
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W (NOTE 4)
EXPOSED PAD (PIN 11) PCB VSS CONNECTION OPTIONAL
TOP VIEW
DA 1
GA 2
SA 3
VZ 4
VDD 5
10 DB
9 GB
8 SB
7 FAULTB
6 VSS
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 160°C/W
Order Information (http://www.linear.com/product/LTC4371#orderinfo)
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4371CDD#PBF
LTC4371CDD#TRPBF LGSD
10-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LTC4371IDD#PBF
LTC4371IDD#TRPBF
LGSD
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC4371CMS#PBF
LTC4371CMS#TRPBF LTGSF
10-Lead Plastic MSOP
0°C to 70°C
LTC4371IMS#PBF
LTC4371IMS#TRPBF
LTGSF
10-Lead Plastic MSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
4371f
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Linear Technology LTC4371
LTC4371
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, IZ = 50µA, VDD = 12.4V, SA = SB = VSS unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VDD Input Supply Range
l 4.5
16
IDD
I npuNGGtoaaSttreemupFFapaaluulOyllttpCtteuoorraVVrteiSSonSSnt,,SSttrroonngg
Pull-Up
Pull-Up
Disabled
Enabled
∆VSD = ±0.1V
VZ = 10.4V, ∆VSD = 0.1V, One GATE = VSS
IZ = 50µA, ∆VSD = 0.1V, One GATE = VSS
l
l
l
200
400
4.5
300
550
7
450
750
9.5
VZ Shunt Regulator Voltage
IZ = 50µA
l 11.8
12.4
14
∆VZ Shunt Regulator Load Regulation
IZ = 50µA to 10mA
l
600
VZ(PU) VZ High Threshold to Enable Strong Gate Pull-Up VDD = VZ Rising
l 10.7 11.2 11.8
∆VZ(PU) VZ High Threshold Hysteresis
0.5
V
µA
µA
mA
V
mV
V
V
VZ(PU)
∆VSD
∆VGATE
IGATE(UP)
IGATE(DN)
tOFF
ID
RD
VBVD
IS
∆VSD(FLT)
VFAULTB
IFAULTB
VZ Low Threshold to Enable Strong Gate Pull-Up
Source-Drain Forward Servo Voltage
Gate Drive (VG – VS)
Gate Pull-Up Current
Gate Pull-Down Current
Strong Gate Pull-Down Current
Gate Turn-Off Time in Fault Condition
D A,MMDOOBSSLFFeEEaTTkaOOgfpefeCnurrent
DA, DB Resistance
DA, DB Breakdown Voltage
SA, SB Leakage Current
Source-Drain Fault Detection Threshold
FAULTB Output Low
FAULTB Leakage Current
VZ Falling
IG = 0µA, –1µA; ∆VSD = 100mV
∆VSD = 100mV, ∆VGATE = 5V
∆VSD = –10mV, ∆VGATE = 5V
∆VSD = –100mV, ∆VGATE = 5V
∆VSD = 0.1V Step to –0.4V,
CGATE = 3.3nF, ∆VGATE <1V
VD = 80V
VD = –40V
∆VSD = –50mV to 0.1V
ID = 10mA, 6ms
VS = 0V
IFAULTB = 5mA
VFAULTB = 16V
l 1.15 1.25 1.35
l5
15 25
l VDD – 0.2
VDD + 0.1
l –3 –5 –8
l7
l1
10 13
23
l 220
V
mV
V
mA
mA
A
ns
l 10 µA
l –10 µA
l 1 2 5 MΩ
l 100 130 170
V
l ±2 μA
l 150 200 225 mV
l 0.4 V
l ±1 μA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive; all voltages are referenced to
VSS unless otherwise specified.
Note 3: An internal clamp limits the DA and DB pins to a minimum of
100V above VSS and –40V below VSS. This pin can be safely tied to higher
voltages through a resistance that limits the current below 1mA DC or
10mA for a 6ms transient. Driving this pin with current beyond the clamp
may damage the device.
Note 4: Thermal resistance is specified with exposed pad soldered to a
3-inch by 4.5-inch, four layer FR4 board. If exposed pad is not soldered
θJA = 93°C/W.
For more information www.linear.com/LTC4371
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