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PDF LTC4226 Data sheet ( Hoja de datos )
| Número de pieza | LTC4226 | |
| Descripción | Wide Operating Range Dual Hot Swap Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
n Allows Safe Board Insertion into Live Backplane
n Selectable Current Limit and Dual-Rate Timer
Accommodate Load Surges
n Fast Response Limits Peak Fault Current
n Wide Operating Voltage Range: 4.5V to 44V
n Optional Auto-Retry or Latchoff after
Overcurrent Fault
n High Side Drive for External N-Channel MOSFET
n Allows Parallel Power Paths for High Current
Applications
n Available in 16-Pin QFN (3mm × 3mm) and MSOP
Packages
Applications
n Apple FireWire/IEEE 1394
n Disk Drives
n Rugged 12V, 24V Applications
n Hot Board/Connector Insertion
n Uni/Bidirectional Current Limiter/Circuit Breaker
LTC4226
Wide Operating Range
Dual Hot Swap Controller
Description
The LTC®4226 dual Hot Swap™ controller allows two
power paths to be safely inserted and removed from a
live backplane or powered connector. Using N-channel
pass transistors, supply voltages ranging from 4.5V to
44V are ramped up at an adjustable rate.
Three selectable ratios of current limit to circuit breaker
threshold accommodate noisy loads and momentary high
peak currents without interruption, while a dual-rate fault
timer protects the MOSFET from extended output over-
current events. FAULT outputs indicate the circuit breaker
status. The LTC4226-1 remains off after a fault while the
LTC4226-2 automatically retries after a 0.5s delay.
The LTC4226 can also be configured as a bidirectional cur-
rent limiter/circuit breaker. For high current applications,
two channels may be configured as parallel power paths.
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
2 Port FireWire Application
SS3P5
7V TO 33V
CURRENT
LIMIT
SELECT
30mΩ FDMS86500DC
VCC1
ON1
FAULT1
CLS
FAULT2
ON2
VCC2
SENSE1 GATE1
LTC4226-2
SENSE2 GATE2
OUT1
FTMR1
GND
FTMR2
OUT2
SMCJ33A* 30mΩ FDMS86500DC
*36.7V TO 40.6V BV
PORT 1
1394 1394
SOCKET PLUG
220nF
220nF
PORT 2
1394 1394
SOCKET PLUG
4226 TA01a
VCC
10V/DIV
VOUT
10V/DIV
Inrush after Load Connection
CABLE INSERTION
IOUT
1A/DIV
INRUSH
CURRENT
VCC = 12V
CLOAD = 1mF
1ms/DIV
4226 TA01b
4226f
1
1 page  
LTC4226
Typical Performance Characteristics TA = 25°C, VCC = 12V, unless otherwise noted.
Supply Current vs Supply Voltage
1000
Circuit Breaker Voltage vs
Supply Voltage
60
Circuit Breaker Voltage vs
Temperature
55.0
800
55 52.5
600
50 50.0
400
45 47.5
200
0
0 10 20 30 40 50
VCC (V)
4226 G01
40
0
10 20 30 40 50
VCC (V)
4226 G02
45.0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
4226 G03
Current Limit Voltage vs
Supply Voltage
200
CLS = 3V
150
CLS = OPEN
100
CLS = 0V
Current Limit Voltage vs
Temperature
200
CLS = 3V
150
CLS = OPEN
100
CLS = 0V
Active Current Limit Delay vs
Sense Voltage
100 CGATE = 1nF
CLS = 3V
10
1 CLS = 0V
CLS = OPEN
0.1
50
0
10 20 30 40 50
VCC (V)
4226 G04
Gate Pull-Up Current vs
Temperature
–15
50
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
4226 G05
Gate Voltage vs Gate Pull-Up
Current
15
0.01
0
100 200 300 400 500 600
SENSE VOLTAGE (VIN – VSENSE) (mV)
4226 G06
Gate Voltage vs Supply Voltage
15
–10 10
10
–5 5
5
0
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
4226 G07
0
0
–5 –10
IGATE(UP) (µA)
–15
4226 G08
0
0 10 20 30 40 50
VCC (V)
4226 G09
4226f
5
5 Page 
Applications Information
LTC4226
CONNECTOR CONNECTOR
12
C1 R2
470pF 100k
12V
ON1
FAULT1
CLS
FAULT2
ON2
C2 R4
470pF 100k
5V
Z1
SMCJ15A
R1
720k
RS1
5mΩ
Q1
FDMS86500DC
OR Si7164DP
VCC1
ON1
FAULT1
CLS
FAULT2
ON2
VCC2
SENSE1 GATE1
LTC4226-1
SENSE2 GATE2
OUT1
FTMR1
GND
FTMR2
OUT2
Z2
SMCJ7V0A
R2
240k
RS2
10mΩ
Q2
FDMS86500DC
OR Si7164DP
CT1
33nF
CT2
33nF
12V
8.9A
OUT
+ CL1
100µF
GND
CL2
220µF
5V
4.45A
OUT
MOTHERBOARD PLUG-IN
OR BACKPLANE CARD
Figure 2. 2-Channel Backplane Resident Controller with Downstream Connector
4226 F02
CLS
FAULT
ON2
CONNECTOR CONNECTOR
12
12V
C1 R2
470pF 100k
Z1
SMCJ15A
R1
720k
RS1
5mΩ
Q1
FDMS86500DC
OR Si7164DP
VCC1
ON1
FAULT1
CLS
FAULT2
ON2
VCC2
SENSE1 GATE1
LTC4226-1
SENSE2 GATE2
OUT1
FTMR1
GND
FTMR2
OUT2
CT1
33nF
CT2
33nF
+
5V
Z2
SMCJ7V0A
RS2
10mΩ
Q2
FDMS86500DC
OR Si7164DP
MOTHERBOARD PLUG-IN
CARD
Figure 3. 2-Channel Controller with a Common ON/OFF Connection
12V
8.9A
OUT
CL1
100µF
GND
CL2
220µF
5V
4.45A
OUT
4226 F03
4226f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC4226.PDF ] | |
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