Linear Technology LTC4370CDE Demoboard, Two-Supply Diode-OR Current Sharing Controller DC1741A DC1741A Scheda Tecnica
Codici prodotto
DC1741A
LTC4370
1
4370f
Typical applicaTion
FeaTures
DescripTion
Two-Supply Diode-OR
Current Balancing Controller
The LTC
®
4370 is a two-supply current sharing controller
which incorporates MOSFET ideal diodes. The diodes
block reverse and shoot-through currents during start-up
and fault conditions. Their forward voltage is adjusted to
share the load currents between supplies. Unlike other
sharing methods, neither a share bus nor trim pins on
the supply are required.
The maximum MOSFET voltage drop can be set with a
The maximum MOSFET voltage drop can be set with a
resistor. A fast gate turn-on reduces the load voltage
droop during supply switchover. If the input supply fails
or is shorted, a fast turn-off minimizes reverse current
transients.
The controller operates with supplies from 2.9V to 18V.
The controller operates with supplies from 2.9V to 18V.
For lower rail voltages, an external supply is needed at
the V
CC
pin. Enable inputs can be used to turn off the
MOSFET and put the controller in a low current state.
Status outputs indicate whether the MOSFETs are on or
off. The load sharing function can be disabled to turn the
LTC4370 into a dual ideal diode controller.
12V, 10A Load Share
Current Sharing Error vs Supply Difference
applicaTions
n
Shares Load Between Two Supplies
n
Eliminates Need for Active Control of
Input Supplies
n
No Share Bus Required
n
Blocks Reverse Current
n
No Shoot-Through Current During Start-Up or Faults
n
0V to 18V High Side Operation
n
Enable Inputs
n
MOSFET On Status Outputs
n
Dual Ideal Diode Mode
n
16-Lead DFN (4mm × 3mm) and MSOP Packages
n
Redundant Power Supplies
n
High Availability Systems and Servers
n
Telecom and Network Infrastructure
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents, including 7920013 and
8022679. Additional patent pending.
SUM85N03-06P
*OPTIONAL, FOR FAST TURN-ON
SUM85N03-06P
GATE1
CPO1
CPO2
GND
EN1
EN2
RANGE
4370 TA01
V
INA
12V
V
INB
12V
0.1µF
NC
OUT
12V, 10A
39nF*
39nF*
V
IN1
V
CC
FETON1
COMP
FETON2
OUT1
OUT2
GATE2
V
IN2
LTC4370
2mΩ
2mΩ
0.18µF
V
INA
– V
INB
(mV)
–750
–20
SHARING ERROR (I
VINA
–
I
VINB
)/
I
L
(%)
–10
0
10
–500 –250
250
0
500
20
–15
–5
5
15
750
4370 TA01b