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PDF LTC4252C-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC4252C-1 | |
| Descripción | Negative Voltage Hot Swap Controllers | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC4252B-1/LTC4252B-2
LTC4252C-1/LTC4252C-2
Negative Voltage
Hot Swap Controllers
FEATURES
DESCRIPTION
n Allows Safe Board Insertion and Removal from a
Live – 48V Backplane
n Floating Topology Permits Very High Voltage Operation
n Current Limit With Circuit Breaker Timer
n Fast Response Time Limits Peak Fault Current
n Programmable Soft-Start Current Limit
n Programmable Timer with Drain Voltage
Accelerated Response
n ±1% Undervoltage/Overvoltage Threshold (LTC4252C)
n Improved Ruggedness Shunt Regulator
■ Adjustable Undervoltage/Overvoltage Protection
■ LTC4252B-1/LTC4252C-1: Latch Off After Fault
■ LTC4252B-2/LTC4252C-2: Automatic Retry After Fault
■ Available in 8-Pin and 10-Pin MSOP Packages
APPLICATIONS
n Hot Board Insertion
n Electronic Circuit Breaker
n – 48V Distributed Power Systems
n Negative Power Supply Control
n Central Office Switching
n High Availability Servers
n ATCA
The LTC®4252 negative voltage Hot SwapTM controller
allows a board to be safely inserted and removed from a
live backplane. Output current is controlled by three stages
of current limiting: a timed circuit breaker, active current
limiting and a fast feedforward path that limits peak current
under worst-case catastrophic fault conditions.
Adjustable undervoltage and overvoltage detectors dis-
connect the load whenever the input supply exceeds the
desired operating range. The LTC4252’s supply input is
shunt regulated, allowing safe operation with very high
supply voltages. A multifunction timer delays initial start-
up and controls the circuit breaker’s response time. The
circuit breaker’s response time is accelerated by sensing
excessive MOSFET drain voltage, keeping the MOSFET
within its safe operating area (SOA). An adjustable soft-
start circuit controls MOSFET inrush current at start-up.
The LTC4252-2 provides automatic retry after a fault. The
LTC4252C-1/LTC4252C-2 feature tight ±1% undervoltage/
overvoltage threshold accuracy. The LTC4252 is available
in either an 8-pin or 10-pin MSOP.
The LTC4252B and LTC4252C improve the ruggedness
of the shunt regulator in the LTC4252 and LTC4252A.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
–48V/2.5A Hot Swap Controller
–48RTN
–48RTN
(SHORT PIN) R1
402k
1%
R2
32.4k
1%
C1
10nF
DDIDNZ†13B**
CT
0.33µF
RIN
3× 1.8k IN SERIES
1/4W EACH
+ CL
100µF
VIN
LTC4252B-1
OV PWRGD
UV DRAIN
TIMER
GATE
SS VEE SENSE
CSS
68nF
CIN R3
1µF 5.1k
*
LOAD
EN
VOUT
RD 1M
Q1
IRF530S
RC
10Ω
CC
18nF
RS
0.02Ω
– 48V
* M0C207
**DIODES, INC
†RECOMMENDED FOR HARSH ENVIRONMENTS
4252B12 TA01
GATE
5V/DIV
SENSE
2.5A/DIV
VOUT
20V/DIV
PWRGD
10V/DIV
Start-Up Behavior
1ms/DIV
4252B12 TA01a
4252b12f
1
1 page  
LTC4252B-1/LTC4252B-2
LTC4252C-1/LTC4252C-2
TYPICAL PERFORMANCE CHARACTERISTICS
VZ vs Temperature
14.5 IIN = 2mA
14.0
13.5
13.0
12.5
12.0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4252B12 G01
IIN vs VIN
1000
100
10
1 125°C
85°C
25°C
–40°C
0.1
0 2 4 6 8 10 12 14 16 18 20 22
VIN (V)
4252B12 G04
Circuit Breaker Current Limit
Voltage VCB vs Temperature
60
58
56
54
52
50
48
46
44
42
40
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4252B12 G07
rZ vs Temperature
10 IIN = 2mA
9
8
7
6
5
4
3
2
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4252B12 G02
Undervoltage Lockout VLKO
vs Temperature
12.0
11.5
11.0
10.5
10.0
9.5
9.0
8.5
8.0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4252B12 G05
Analog Current Limit Voltage
VACL vs Temperature
120
115
110
105
100
95
90
85
80
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4252B12 G08
IIN vs Temperature
2000
1800
VIN = (VZ – 0.3V)
1600
1400
1200
1000
800
600
400
200
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4252B12 G03
Undervoltage Lockout Hysteresis
VLKH vs Temperature
1.5
1.3
1.1
0.9
0.7
0.5
–55 –35 –15 5 25 45 65 95 105 125
TEMPERATURE (°C)
4252B12 G06
Fast Current Limit
vs Temperature
Voltage
VFCL
300
275
250
225
200
175
150
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4252B12 G09
4252b12f
5
5 Page 
BLOCK DIAGRAM
VIN
LTC4252B-1/LTC4252B-2
LTC4252C-1/LTC4252C-2
DRAIN
VEE
6.15V
(5.09V)
–
OV * +
UV * – (+)
TIMER
2.925V
VIN (3.08V)
230µA VIN
5.8µA
4V
+(–)
–
+
–
VEE 5.8µA
VIN
22µA
(28µA)
VEE
1V
+
SS
95k
(47.5k)
RSS
5k
(2.5k)
VEE
VEE
2.385V
VIN
8×
VIN
58µA
VEE
1×
1×
VEE
6.15V
(5V)
1× VIN
58µA
PWRGD **
VEE
2.8V
– + VIN
GATE
LOGIC
0.5V
FCL 200mV
+ – VEE
+
VOS = 10mV
ACL
–+ –
CB 50mV
+ – VEE
VEE
SENSE
VEE
*OV AND UV ARE TIED TOGETHER ON THE MS8 PACKAGE. OV AND UV ARE SEPARATE PINS ON THE MS PACKAGE
** ONLY AVAILABLE IN THE MS PACKAGE
FOR COMPONENTS, CURRENT AND VOLTAGE WITH TWO VALUES, VALUES IN PARENTHESES REFER
TO THE LTC4252C. VALUES WITHOUT PARENTHESES REFER TO THE LTC4252B
4252B12 BD
4252b12f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4252C-1.PDF ] | |
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