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PDF LTC4211 Data sheet ( Hoja de datos )
| Número de pieza | LTC4211 | |
| Descripción | Hot Swap Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4211
Hot Swap Controller with
Multifunction Current Control
FEATURES
s Allows Safe Board Insertion and Removal
from a Live Backplane
s Controls Supply Voltages from 2.5V to 16.5V
s Programmable Soft-Start with Inrush Current
Limiting, No External Gate Capacitor Required
s Faster Turn-Off Time Because No External Gate
Capacitor is Required
s Dual Level Overcurrent Fault Protection
s Programmable Response Time for Overcurrent
Protection (MS)
s Programmable Overvoltage Protection (MS)
s Automatic Retry or Latched Mode Operation (MS)
s High Side Drive for an External N-Channel FET
s User-Programmable Supply Voltage Power-Up Rate
s FB Pin Monitors VOUT and Signals RESET
s Glitch Filter Protects Against Spurious RESET Signal
U
APPLICATIO S
s Electronic Circuit Breaker
s Hot Board Insertion and Removal (Either On
Backplane or On Removable Card)
s Industrial High Side Switch/Circuit Breaker
DESCRIPTIO
The LTC®4211 is a Hot SwapTM controller that allows a
board to be safely inserted and removed from a live
backplane. An internal high side switch driver controls the
gate of an external N-channel MOSFET for supply voltages
ranging from 2.5V to 16.5V. The LTC4211 provides soft-
start and inrush current limiting during the start-up period
which has a programmable duration.
Two on-chip current limit comparators provide dual level
overcurrent circuit breaker protection. The slow com-
parator trips at VCC – 50mV and activates in 20µs (or
programmed by an external filter capacitor, MS only). The
fast comparator trips at VCC – 150mV and typically
responds in 300ns.
The FB pin monitors the output supply voltage and signals
the RESET output pin. The ON pin signal turns the chip on
and off and can also be used for the reset function. The
MS package has FAULT and FILTER pins to provide
additional functions like fault indication, autoretry or
latch-off modes, programmable current limit response
time and programmable overvoltage protection using an
external Zener diode clamp.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Single Channel 5V Hot Swap Controller
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE) (MALE)
VCC LONG
5V
RX
Z1* 10Ω
CX
100nF
RSENSE
0.007Ω
M1
Si4410DY
87
6
+
CLOAD
R3 R5
VOUT
5V
5A
VCC SENSE
GATE
36k
5
10k
R1 FB
SHORT 20k
2
ON
R2
10k
LTC4211
1
RESET
R4
15k
µP
LOGIC
RESET
TIMER
GND
PCB CONNECTION SENSE
3 CTIMER 4
LONG
10nF
GND
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
GND
4211 TA01A
Power-Up Sequence
NO CLOAD
VGATE
5V/DIV
VRESET
5V/DIV
VON
1V/DIV
VTIMER
1V/DIV
2.5ms/DIV
4211 TA01b
4211f
1
1 page  
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TYPICAL PERFOR A CE CHARACTERISTICS
LTC4211
GATE Output Source Current
vs Supply Voltage
13
TA = 25°C
12
11
10
9
8
7
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G10
Normal GATE Pull-Down Current
vs Temperature
260
VCC = 5V
240
220
200
180
160
140
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G13
Feedback Threshold
vs Supply Voltage
1.250
TA = 25°C
1.245
1.240
1.235
HIGH THRESHOLD
LOW THRESHOLD
1.230
1.225
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G16
GATE Output Source Current
vs Temperature
13
12
11
VCC = 15V
10
VCC = 3V
VCC = 12V VCC = 5V
9
8
7
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G11
Fast GATE Pull-Down Current
vs Supply Voltage
80
TA = 25°C
70
60
50
40
30
20
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G14
Feedback Threshold
vs Temperature
1.250
VCC = 5V
1.245
1.240
HIGH THRESHOLD
1.235
1.230
LOW THRESHOLD
1.225
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G17
Normal GATE Pull-Down Current
vs Supply Voltage
260
TA = 25°C
240
220
200
180
160
140
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G12
Fast GATE Pull-Down Current
vs Temperature
80
VCC = 5V
70
60
50
40
30
20
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G15
FILTER Threshold
vs Supply Voltage
1.40
TA = 25°C
1.35
1.30
1.25 HIGH THRESHOLD
1.20
LOW THRESHOLD
1.15
1.10
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G18
4211f
5
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LTC4211
PI FU CTIO S (8-Lead Package/10-Lead Package)
FAULT (Not available on S8/MS8, Pin 10 MS): FAULT is
both an input and an output. Connected to this pin are an
analog comparator (COMP6) and an open-drain N-chan-
nel FET. During normal operation, if COMP6 is driven
below 1.236V, the electronic circuit breaker trips and the
GATE pin pulls low. Typically, a 10k pull-up resistor
connects to the FAULT pin. This allows the LTC4211 to
begin a second timing cycle (VFAULT > 1.286) and start-up
properly. This also allows the use of the FAULT pin as a
status output. Under normal operating conditions, the
FAULT output is a logic high. Two conditions cause an
active low on FAULT: (1) the LTC4211’s electronic circuit
breaker trips because of an output short circuit (VOUT =
0V) or because of a fast output overcurrent transient
(FAST COMP trips circuit breaker); or (2) VFILTER >
1.236V. The FAULT output is driven to logic low and is
latched logic low until the ON pin is driven to logic low for
150µs (the tRESET duration).
FILTER (Not available S8/MS8, Pin 3 MS): Overcurrent
Fault Timing Pin and Overvoltage Fault Set pin. With a
capacitor connected from this pin to ground, the SLOW
COMP’s response time can be adjusted. In the S8/MS8
version of the LTC4211, the FILTER pin is not available and
the delay time from overcurrent detect to GATE OFF is fixed
at 20µs.
BLOCK DIAGRA
VCC
2µA
TIMER
3 (4)
M6
VCC
2µA
FILTER
(3)
MS ONLY
M5
M4
10µA
VCC 8 (9)
SENSE 7 (8)
GATE 6 (7)
UVLO
tTIMER
0.2V +
COMP3
–
+
COMP4
VREF –
NORMAL
FAULT
+
COMP5
VREF –
NORMAL, RESET
+– 50mV
+– 150mV
+–
SLOW
COMP
+–
FAST
COMP
COMP7
0.2V
M3
200µA
Z1
VZ (TYP) = 12V
VCC
10µA CHARGE
PUMP
10µA
Z2
VZ (TYP) = 26V
RESET
1
M1
GLITCH FILTER
(SEE NOTE 1)
300ns
DELAY
CB
TRIPS
OR UVLO ON LOW
START-UP
CURRENT
GATE
REGULATOR CHARGING
LOGIC
GLITCH FILTER
150µs
GLITCH FILTER
FUNCTION OF
OVERDRIVE
COMP1
COMP2
POWER BAD
+
COMP6
–
VREF
CB TRIPS
FAULT
(10)
MS ONLY
M2
VREF
0.2V
BG
GND
4 (5)
NOTE 1: SET BY FILTER CAPACITOR FOR MS
20µs DEFAULT FOR MS8, S8
PIN NUMBERS FOR S8/MS8 (MS)
VREF
VREF
2 ON
5 (6) FB
4211 BD
4211f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4211.PDF ] | |
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