LTC4350_15 Datasheet, PDF (1/18 Pages) Linear Technology – Hot Swappable Load Share Controller

NOT RECOMMENDED FOR NEW DESIGNS
Contact Linear Technology for Potential Replacement
Features
n _{Build N + 1 Redundant Supply}
n _{Hot Swap™ Power Supplies}
n _{Isolates Supply Failures from Output}
n _{Eliminates ORing Diodes}
n _{Identifies and Localizes Output Low, Output High}
and Open-Circuit Faults
n _{Output Voltages from 1.5V to 12V}
n _{16-Lead Narrow SSOP Package}
Applications
n _{Servers and Network Equipment}
n _{Telecom and Base Station Equipment}
n _{Distributed Power Systems}
LTC4350
Hot Swappable
Load Share Controller
Description
The LTC^®4350 is a load share controller that allows sys-
tems to equally load multiple power supplies connected
in parallel. The output voltage of each supply is adjusted
using the SENSE⁺ input until all currents match the share
bus. The LTC4350 also isolates supply failures by turning
off the series pass transistors and identifying the failed
supply. The failed supply can then be removed and replaced
with a new unit without turning off the system power. The
LTC4350 is available in a 16-pin narrow SSOP package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are
the property of their respective owners.
Typical Application
SENSE⁺
OUT⁺
5V Load Share (5A per Module)
SUD50N03-07
0.010Ω
V_OUT+ SHARE BUS V_OUT–
VICOR*
VI-J30-CY
51Ω
0.1µF 0.1µF
274k 43.2k
TRIM
SENSE^–
OUT^–
0.1µF 121k 12.1k
470k
0.1µF
100Ω
37.4k
GATE
V_CC
UV
R⁺
LTC4350
R^– _FB
I_OUT
STATUS
OV
TIMER
GAIN COMP1
SB
R_SET
GND COMP2
1000pF
4.7µF
34k
150Ω
12.1k
STATUS
100Ω
SENSE⁺
OUT⁺
SUD50N03-07
0.010Ω
VICOR*
VI-J30-CY
TRIM
SENSE^–
OUT^–
51Ω
0.1µF 0.1µF
274k 43.2k
0.1µF 121k 12.1k
470k
0.1µF
100Ω
37.4k
GATE
V_CC
UV
R⁺
LTC4350
R^– _FB
I_OUT
STATUS
OV
TIMER
GAIN COMP1
SB
R_SET
GND COMP2
1000pF
4.7µF
34k
150Ω
12.1k
STATUS
100Ω
*LOAD SHARING CIRCUIT WORKS WITH MOST POWER SUPPLIES THAT HAVE A SENSE⁺ OR FB PIN
4350 TA01
4350fb