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LTC4350IGN#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC4350
1
4350fb
Typical applicaTion
FeaTures DescripTion
Hot Swappable
Load Share Controller
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.
5V Load Share (5A per Module)
applicaTions
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
n
Servers and Network Equipment
n
Telecom and Base Station Equipment
n
Distributed Power Systems
GAIN COMP1 GND COMP2
GATE
0.010Ω
SUD50N03-07
R
+
R
–
R
SET
FB
I
OUT
STATUS STATUS
SHARE BUS
SB
TIMER
V
CC
V
OUT
+
V
OUT
–
UV
OV
0.1µF
51Ω 100Ω
37.4k
12.1k
100Ω
4.7µF
1000pF
150Ω
0.1µF
LTC4350
0.1µF
34k
470k
12.1k
121k
43.2k
274k
0.1µF
VICOR*
VI-J30-CY
SENSE
+
OUT
+
SENSE
–
TRIM
OUT
–
GAIN COMP1 GND COMP2
GATE
0.010Ω
SUD50N03-07
R
+
R
–
R
SET
FB
I
OUT
STATUS STATUS
SB
TIMER
V
CC
UV
OV
0.1µF
51Ω 100Ω
37.4k
12.1k
100Ω
4350 TA01
4.7µF
1000pF
150Ω
0.1µF
LTC4350
34k
*LOAD SHARING CIRCUIT WORKS WITH MOST POWER SUPPLIES THAT HAVE A SENSE
+
OR FB PIN
470k
0.1µF
VICOR*
VI-J30-CY
SENSE
+
OUT
+
SENSE
–
TRIM
OUT
–
0.1µF
12.1k121k
43.2k
274k
NOT RECOMMENDED FOR NEW DESIGNS
Contact Linear Technology for Potential Replacement
LTC4350
2
4350fb
pin conFiguraTionabsoluTe MaxiMuM raTings
Supply Voltage (V
CC
) ................................................17V
Input Voltage
TIMER ................................................... –0.3V to 1.2V
R
+
, R
–
(Note 2) ...................................... –0.3V to 17V
FB ......................................................... –0.3V to 5.3V
OV, UV ....................................................... –0.3V to 17V
Output Voltage
COMP1 .................................................... –0.3V to 6V
COMP2 .................................................... –0.3V to 3V
GAIN, SB ............................................... –0.3V to 5.6V
GATE (Note 3) ............................................ –0.3V to 20V
I
OUT
, STATUS ............................................. –0.3V to 17V
R
SET
............................................................. –0.3V to 1V
Operating Temperature Range
LTC4350C ................................................ 0°C to 70°C
LTC4350I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
(Note 1)
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
UV
OV
TIMER
GAIN
COMP2
COMP1
SB
GND
V
CC
STATUS
GATE
R
+
R
–
I
OUT
R
SET
FB
T
JMAX
= 150°C, θ
JA
= 135°C/W
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4350CGN#PBF LTC4350CGN#TRPBF 4350 16-Lead Plastic SSOP 0°C to 70°C
LTC4350IGN#PBF LTC4350IGN#TRPBF 4350I 16-Lead Plastic SSOP –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Characteristics
I
CC
V
CC
Supply Current UV = V
CC
l
1.0 1.6 2.0 mA
V
LKOH
V
CC
Undervoltage Lockout High
l
2.36 2.45 2.52 V
V
LKOL
V
CC
Undervoltage Lockout Low
l
2.24 2.34 2.44 V
V
FB
FB Pin Voltage 0°C to 85°C (LTC4350I) or 0°C to 70°C (LTC4350C)
–40°C to 85°C (LTC4350I)
1.208
1.196
1.220
1.220
1.236
1.244
V
V
V
FBLIR
FB Line Regulation V
CC
= 3.3V to 12V, COMP1 = 1.240V 0.02 0.05 %/V
V
FBLOR
FB Load Regulation COMP1 = 2V
COMP1 = 0.64V
l
l
–0.0008
0.003
–0.1
0.1
%
%
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V unless otherwise noted.
LTC4350
3
4350fb
elecTrical characTerisTics
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.
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Characteristics
V
UVTH
UV Pin Threshold High Going Threshold
Low Going Threshold
l
l
1.215
1.205
1.244
1.220
1.258
1.237
V
V
V
OVTH
OV Pin Threshold High Going Threshold
Low Going Threshold
l
l
1.203
1.180
1.220
1.205
1.250
1.229
V
V
V
TM
TIMER Pin Threshold
l
1.18 1.22 1.26 V
I
TM
TIMER Pin Current TIMER On, V
TIMER
= 0V
TIMER On, V
TIMER
= 0V, V
OV
> V
OVTH
l
l
–1.75
–5.30
–2
–6
–2.3
–6.7
µA
µA
V
G
GAIN Pin Voltage R
GAIN
= 25k, (V
R
+
– V
R
–
) = 100mV
l
2.3 2.5 2.7 V
V
GO
GAIN Pin Offset R
GAIN
= 25k, (V
R
+
– V
R
–
) = 0mV
l
0 0.02 0.20 V
V
SB(MIN)
SB Pin Minimum Voltage 2 8 mV
V
SB(MAX)
SB Pin Maximum Voltage V
CC
= 3.3V
V
CC
= 12V
l
l
2.4
5.6
2.7
7.8
2.9
10.5
V
V
I
SB(MAX)
SB Pin Maximum Current V
SB
= 0V
l
–8 –33 –41 mA
R
SB
SB Pin Resistor Value
l
14 20 33 kΩ
V
E/A2OFF
E/A2 Offset V
SB
– V
GAIN
l
8 25 50 mV
V
RSET(MAX)
R
SET
Pin Maximum Voltage V
CC
= 3.3V, R
SET
= 100Ω
V
CC
= 12V, R
SET
= 100Ω
l
l
0.94
0.94
1
1
1.03
1.03
V
V
V
RSET(MIN)
R
SET
Pin Minimum Voltage V
CC
= 5V, R
SET
= 1000Ω
V
CC
= 5V, R
SET
= 100Ω
l
l
0.001
0.001
0.5
0.5
V
V
I
RSET(MAX)
R
SET
Pin Maximum Current R
SET
= 50Ω, V
IOUT
= 1.1V
l
18 20 21 mA
V
RCTH
Reverse Current Threshold V
R
+
– V
R
+
l
10 30 40 mV
∆V
GATE
External N-Channel Gate Drive V
GATE
– V
CC
l
10.8 12 12.7 V
I
GATE
GATE Pin Current Gate On, V
GATE
= 0V
l
–8 –10 –12 µA
V
SOL
STATUS Pin Output Low I
OUT
= 3mA
l
0.1 0.3 1.2 V
Note 2: R
+
and R
–
could be at 17V while V
CC
= 0V.
Note 3: An internal clamp limits the GATE pin to a minimum of 10.8V
above V
CC
. Driving this pin to voltages beyond the clamp may damage the
part.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC4350IGN#PBF

Mfr. #:
Buy LTC4350IGN#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Hot Swappable Load Share Cntr
Lifecycle:
New from this manufacturer.
Delivery:
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