LTC4370IMSTRPBF View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC4370IMSTRPBF' PDF : 20 Pages View PDF
LTC4370
Two-Supply Diode-OR
Current Balancing Controller
Features
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
Applications
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.
Description
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
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.
For lower rail voltages, an external supply is needed at
the VCC 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.
Typical Application
12V, 10A Load Share
VINA
SUM85N03-06P
12V
39nF*
0.1µF
NC
EN1 CPO1
VCC
GND
RANGE
VIN1 GATE1
OUT1
LTC4370
FETON1
FETON2
OUT2
EN2 CPO2
VIN2 GATE2 COMP
39nF*
VINB
12V
SUM85N03-06P
*OPTIONAL, FOR FAST TURN-ON
2mΩ
2mΩ
OUT
12V, 10A
0.18µF
4370 TA01
Current Sharing Error vs Supply Difference
20
15
10
5
0
–5
–10
–15
–20
–750 –500 –250 0 250
VINA – VINB (mV)
500 750
4370 TA01b
4370f
1
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