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PDF LTC4252-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC4252-1 | |
| Descripción | Negative Voltage Hot Swap Controllers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Allows Safe Board Insertion and Removal from a
Live – 48V Backplane
■ Floating Topology Permits Very High Voltage
Operation
■ Programmable Analog Current Limit With Circuit
Breaker Timer
■ Fast Response Time Limits Peak Fault Current
■ Programmable Soft-Start Current Limit
■ Programmable Timer with Drain Voltage
Accelerated Response
■ ±1% Undervoltage/Overvoltage Threshold Accuracy
(LTC4252A)
■ Adjustable Undervoltage/Overvoltage Protection
■ LTC4252-1/LTC4252A-1: Latch Off After Fault
■ LTC4252-2: Automatic Retry After Fault
■ Available in 8-Pin and 10-Pin MSOP Packages
U
APPLICATIO S
■ Hot Board Insertion
■ Electronic Circuit Breaker
■ – 48V Distributed Power Systems
■ Negative Power Supply Control
■ Central Office Switching
■ High Availability Servers
■ ATCA
LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
Negative Voltage
Hot Swap Controllers
DESCRIPTIO
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 LTC4252-1/LTC4252A-1 latch off after a circuit breaker
fault times out. The LTC4252-2 provides automatic retry
after a fault. The LTC4252A-1/LTC4252A-2 feature tight
±1% undervoltage/overvoltage threshold accuracy. The
LTC4252 is available in either an 8-pin or 10-pin MSOP.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
– 48V/2.5A Hot Swap Controller
GND
RIN
3× 1.8k IN SERIES
+ CL
1/4W EACH
100µF
GND
(SHORT PIN)
R1
402k
1%
R2
32.4k
1%
C1
10nF
CT
0.33µF
VIN
LTC4252-1
OV PWRGD
UV DRAIN
TIMER
GATE
SS
CSS
68nF
VEE SENSE
– 48V
* M0C207
CIN
1µF
R3
5.1k
RD 1M
*
RC
10Ω
CC
18nF
LOAD
EN
VOUT
Q1
IRF530S
RS
0.02Ω
4252-1/2 TA01
GATE
5V/DIV
SENSE
2.5A/DIV
VOUT
20V/DIV
PWRGD
10V/DIV
Start-Up Behavior
1ms/DIV
4252-1/2 TA01a
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
TYPICAL PERFOR A CE 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)
4252-1/2 G04
IIN vs VIN
1000
TA = –40°C
100
TA = 25°C
10 TA = 85°C
1 TA = 125°C
0.1
0 2 4 6 8 10 12 14 16 18 20 22
VIN (V)
4252-1/2 G02
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)
4252-1/2 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)
4252-1/2 G03
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)
4252-1/2 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)
4252-1/2 G08
IIN vs Temperature
2000
VIN = (VZ – 0.3V)
1800
1600
1400
1200
1000
800
600
400
200
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4252-1/2 G01
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)
4252-1/2 G06
Fast Current Limit Voltage VFCL
vs Temperature
300
275
250
225
200
175
150
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4252-1/2 G09
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BLOCK DIAGRA
VIN
LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
DRAIN
VEE
6.15V
(5.09V)
–
OV * +
UV * – (+)
2.385V
VIN
8×
VIN
58µA
VEE
1×
1×
VEE
6.15V
(5V)
1× VIN
58µA
PWRGD **
VEE
2.8V
– + VIN
GATE
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
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 LTC4252A. VALUES WITHOUT PARENTHESES REFER TO THE LTC4252
4252-1/2 BD
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4252-1.PDF ] | |
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