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PDF LTC1153 Data sheet ( Hoja de datos )
| Número de pieza | LTC1153 | |
| Descripción | Auto-Reset Electronic Circuit Breaker | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC1153 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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FEATURES
s Programmable Trip Delay: 15µs to >100ms
s Programmable Trip Current: 1mA to >20A
s Programmbale Auto-Reset Time: 1ms to >10 sec.
s 4.5V to 18V Supply Range
s Drives Low RDS(ON) N-Channel MOSFETs
s Status Output Indicates Fault Condition
s Thermal Trip with PTC Thermistor
s 8µA IQ in Standby Mode
s No External Charge Pump Capacitors
s Available in 8-Pin SOIC
APPLICATI S
s Power Bus Circuit Breaker
s SCSI Termination Power Protection
s Regulator Over-Current Protection
s Battery Short-Circuit Protection
s DC Motor Stall Protection
s Sensitive System Power Interrupt
LTC1153
Auto-Reset
Electronic Circuit Breaker
DESCRIPTIO
The LTC1153 electronic circuit breaker drives a low cost
N-channel MOSFET to interrupt power to a sensitive
electronic load in the event of an over-current condition.
The breaker remains tripped for a period of time set by an
external timing capacitor and then is automatically reset.
This cycle continues until the over-current condition is
removed, protecting both the sensitive load and the
MOSFET switch.
The trip current, trip delay time and auto-reset period are
programmable over a wide range to accommodate a
variety of load impedances. An active high shutdown input
is also provided and interfaces directly to a PTC thermistor
for thermal circuit breaking. An open-drain output is
provided to report breaker status to the µP.
The LTC1153 is available in both 8-pin DIP and 8-pin SOIC
packages.
TYPICAL APPLICATI
5V/1A Electronic Circuit Breaker with 1ms Trip Delay,
200ms Auto-Reset Period and 70°C Thermal Shutdown
ON/OFF
CT
0.22µF
Z5U
TO µP
51k
5V
IN VS
CT
LTC1153
STATUS
DS
G
GND SHUTDOWN
**70°C
PTC
CD RD
0.01µF 100k
*RSEN
0.1Ω
IRLR024
51k
SENSITIVE
5V LOAD
ALL COMPONENTS SHOWN ARE SURFACE MOUNT.
* IMS026 INTERNATIONAL MANUFACTURING SERVICE, INC. (401) 683-9700
** RL2006-100-70-30-PT1 KEYSTONE CARBON COMPANY (814) 781-1591
LTC1153 • TA01
Trip Delay Time
10
RSEN = 0.1Ω
RD = 100k
CD = 0.01µF
1
0.1
0.01
1
10
CIRCUIT BREAKER CURRENT (A)
100
LTC1153 • TA02
1
1 page  
LTC1153
TYPICAL PERFOR A CE CHARACTERISTICS
Shutdown Threshold Voltage
2.4
2.2
2.0
1.8
1.6
1.4
VS = 5V
1.2
1.O VS = 18V
0.8
0.6
0.4
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1153 • TPC13
Auto-Reset Time*
10
*SECONDS OF DELAY
PER µF CT
VS = 12V
1 VS = 5V
VS = 18V
MOSFET Gate Drive Current
1000
TA = 25°C
100
VS = 18V
VS = 12V
10
1 VS = 5V
0.1
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1153 • TPC14
0.1
0
4 8 12 16 20
GATE VOLTAGE ABOVE SUPPLY (V)
LTC1153 • TPC15
PI FU CTIO S
Input and Shutdown Pins
The LTC1153 input pin is active high and activates all of the
protection and charge pump circuitry when switched ON.
The shutdown pin is designed to break the circuit if a
secondary fault condition (over temperature, etc.) is de-
tected. The LTC1153 logic and shutdown inputs are high
impedance CMOS gates with ESD protection diodes to
ground and supply and therefore should not be forced
beyond the power supply rails. The shutdown pin should
be connected to ground when not in use.
Timing Capacitor Pin (Auto-Reset Timer)
The small capacitor charging current (4.2µA) produces
large delays with relatively small valued capacitors, but
care must be taken to ensure that this current is not
shunted to ground through a leaky capacitor or printed
circuit board trace. The timing capacitor voltage is sensed
by a high impedance CMOS comparator input with ESD
clamp diodes to ground and supply and therefore should
not be forced beyond the power supply rails. This pin can
be grounded if the auto-reset function is not used.
MOSFET Gate Drive Pin
The MOSFET gate drive pin is either driven to ground when
the switch is turned OFF or driven above the supply rail
when the switch is turned ON. This pin is a relatively high
impedance when driven above the rail (the equivalent of a
few hundred kΩ). Care should be taken to minimize any
loading of this pin by parasitic resistance to ground or
supply.
Supply Pin
The supply pin of the LTC1153 serves two vital purposes.
The first is obvious: it powers the input, gate drive, regu-
lation and protection circuitry. The second purpose is less
obvious: it provides a Kelvin connection to the top of the
drain sense resistor for the internal 100mV reference.
The LTC1153 is designed to be continuously powered so
that the gate of the MOSFET is actively driven at all times.
If it is necessary to remove power from the supply pin and
then re-apply it, the input pin (or enable pin) should be
cycled a few milliseconds after the power is re-applied to
reset the input latch and protection circuitry. Also, the
input and enable pins should be isolated with 10k resistors
to limit the current flowing through the ESD protection
diodes to the supply pin.
The supply pin of the LTC1153 should never be forced
below ground as this may result in permanent damage to
the device. A 300Ω resistor should be inserted in series
with the ground pin if negative supply voltage transients
are anticipated.
5
5 Page 
LTC1153
APPLICATI S I FOR ATIO
Five volt linear regulators with small output capacitors
are the most difficult to protect as they can “switch”
from a voltage mode to a current limited mode very
quickly. The large output capacitors on many switching
regulators, on the other hand, may be able to hold the
supply pin of the LTC1153 above 3.5V sufficiently long
that this extra filtering is not required.
Because the LTC1153 is micropower in both the standby
and ON state, the voltage drop across the supply filter
is less than 2mV, and does not significantly alter the
accuracy of the 100mV drain sense threshold voltage.
U
TYPICAL APPLICATIO S
Over-Temperature Circuit Breaker
Over-Voltage Circuit Breaker
12V
5V IN VS
51k CT
DS
0.47µF
LTC1153
STATUS
G
GND SD
*RL3006-50-100-25-PT0 KEYSTONE
+
100µF
5V
30k
MTD3055E
*PTC
THERMISTOR
(100°C)
12V
LOAD
LTC1153 • TA03
4.75V TO 5.25V
IN VS
5V
51k CT
DS
0.22µF
LTC1153
STATUS
G
GND SD
SWITCH IS SHUTDOWN WHEN VS > 5.7V
+
10µF
100Ω
5.6V
IRLD024
5V
LOAD
LTC1153 • TA05
24V to 28V Over-Temperature Circuit Breaker
24V to 28V Over-Temperature Circuit Breaker
with Bootstrapped Supply
24V TO 28V
+
100µF
5V
51k
IN VS
CT
0.47µF
LTC1153
STATUS
DS
G
GND SD
*KEYSTONE RL2006-100-100-30-PT.
MOUNT ON MOSFET OR LOAD HEAT SINK.
3k
+
18V 10µF
MTP12N06
30k
5V
*PTC
THERMISTOR
(100°C)
24V TO 28V
LOAD
LTC1153 • TA04
24V TO 28V
+
100µF
100k
+
IN VS 18V 10µF 6.2k
5V
51k CT
DS
0.47µF
LTC1153
1N4148
STATUS
G
MTP15N06E
30k
GND SD
5V
*PTC
THERMISTOR
(100°C)
* KEYSTONE RL2006-100-100-30-PT.
MOUNT ON MOSFET OR LOAD HEAT SINK.
** BOOTSTRAPPING REDUCES IQ(OFF) TO 60µA, IQ(ON) = 1mA.
24V TO 28V
LOAD
LTC1153 • TA06
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1153.PDF ] | |
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