Datasheet

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LTC1153

ESCRIPTIO

Auto-Reset

Electronic Circuit Breaker

■

Programmable Trip Delay: 15µs to >100ms

■

Programmable Trip Current: 1mA to >20A

■

Programmbale Auto-Reset Time: 1ms to >10 sec.

■

4.5V to 18V Supply Range

■

Drives Low R

DS(ON)

N-Channel MOSFETs

■

Status Output Indicates Fault Condition

■

Thermal Trip with PTC Thermistor

■

8µA I

in Standby Mode

■

No External Charge Pump Capacitors

■

Available in 8-Pin SOIC

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.

■

Power Bus Circuit Breaker

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SCSI Termination Power Protection

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Regulator Over-Current Protection

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Battery Short-Circuit Protection

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DC Motor Stall Protection

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Sensitive System Power Interrupt

ITY

Trip Delay Time

5V/1A Electronic Circuit Breaker with 1ms Trip Delay,

200ms Auto-Reset Period and 70°C Thermal Shutdown

CIRCUIT BREAKER CURRENT (A)

0.01

TRIP DELAY (ms)

10 100

LTC1153 • TA02

0.1

SEN

= 0.1Ω

= 100k

= 0.01µF

IN



STATUS

GND

VS

DS

G

SHUTDOWN

LTC1153



0.01µF



100k

SEN



0.1Ω

IRLR024

51k

SENSITIVE

5V LOAD

**70°C

PTC

51k

TO µP



0.22µF

ON/OFF

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

Z5U

Summary of content (16 pages)

PAGE 1
LTC1153 Auto-Reset Electronic Circuit Breaker U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Programmable Trip Delay: 15µs to >100ms Programmable Trip Current: 1mA to >20A Programmbale Auto-Reset Time: 1ms to >10 sec. 4.
PAGE 2
LTC1153 W W W AXI U U ABSOLUTE RATI GS Supply Voltage ........................................................ 22V Input Voltage ..................... (VS + 0.3V) to (GND – 0.3V) Timing Capacitor Voltage ... (VS + 0.3V) to (GND – 0.3V) Gate Voltage ....................... (VS + 24V) to (GND – 0.3V) Status Output Voltage .............................................. 15V Current (Any Pin).................................................. 50mA Operating Temperature LTC1153C ............................
PAGE 3
LTC1153 ELECTRICAL CHARACTERISTICS VS = 4.5V to 18V, TA = 25°C, CT = 0.1µF, VSD = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VGATE – VS Gate Voltage Above Supply VS = 5V VS = 6V VS = 12V ● ● ● MIN LTC1153C TYP MAX UNITS 6.0 7.5 15.0 7.0 8.3 18.0 9.0 15.0 25.0 V V V 0.05 0.
PAGE 4
LTC1153 U W TYPICAL PERFOR A CE CHARACTERISTICS Input Threshold Voltage 1.8 1.6 VON 1.4 VOFF 1.2 1.0 0.8 0.6 0.4 5 0 3.3µF 130 120 110 100 90 80 CGATE = 1000pF 400 VGS = 5V VGS = 2V 5 CGATE = 1000pF TIME FOR VGATE < 1V 40 35 35 25 20 10 5 5 0 5 0 20 10 15 SUPPLY VOLTAGE (V) 0 900 40 Input ON Threshold Voltage SUPPLY CURRENT (µA) 25 20 0 –50 –25 2.4 VIN = 5V 2.
PAGE 5
LTC1153 U W TYPICAL PERFOR A CE CHARACTERISTICS Shutdown Threshold Voltage Auto-Reset Time* 1000 10 TA = 25°C *SECONDS OF DELAY PER µF CT 2.2 1.8 1.6 1.4 VS = 5V 1.2 VS = 18V 1.O 0.8 GATE DRIVE CURRENT (µA) 2.0 AUTO-RESET TIME (s/µF) SHUTDOWN THRESHOLD VOLTAGE (V) 2.4 MOSFET Gate Drive Current VS = 12V VS = 5V 1 VS = 18V 100 VS = 18V VS = 12V 10 VS = 5V 1 0.6 0.4 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 0.1 –50 0.
PAGE 6
LTC1153 U U U PI FU CTIO S Drain Sense Pin The drain sense pin is compared against the supply pin voltage. If the voltage at this pin is more than 100mV below the supply pin, the input latch will trip and the MOSFET switch will be turned off. This pin is also a high impedance CMOS gate with ESD protection and therefore should not be forced beyond the power supply rails. Some loads, such as large supply capacitor, lamps, or motors require high inrush currents.
PAGE 7
LTC1153 WU W TI I G DIAGRA TEST CIRCUITS 5V 1 INPUT 51k STATUS 2 0.1µF Z5U 3 4 IN VS CT DS 7 CP 0.01µF RSEN 0.
PAGE 8
LTC1153 LTC1153 OPERATIO U Controlled Gate Rise and Fall Times Status Output Driver When the input is switched ON and OFF, the gate is charged by the internal charge pump and discharged in a controlled manner. The charge and discharge rates have been set to minimize RFI and EMI emissions in normal operation. If a short-circuit or current overload condition is encountered, the gate is discharged very quickly (typically a few microseconds) by a large N-channel transistor.
PAGE 9
LTC1153 W U U UO APPLICATI S I FOR ATIO should be connected across the load, as shown in Figure 2, to safely divert the stored energy. Using the values shown in Figure 3, the start-up current is less than 100mA and does not false-trip the breaker. Capacitive Loads Lamp Loads Large capacitive loads, such as complex electrical systems with large bypass capacitors, should be powered using the circuit shown in Figure 3.
PAGE 10
LTC1153 W U U UO APPLICATI S I FOR ATIO The Y axis of the graph is normalized to one RC time constant. The X axis is normalized to the set current. (The set current is defined as the current required to develop 100mV across the drain sense resistor). Note that the trip delay time is shorter for increasing levels of MOSFET current. This ensures that the total energy dissipated by the MOSFET is always within the bounds established by the manufacturer for safe operation.
PAGE 11
LTC1153 W U U UO 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.
PAGE 12
LTC1153 UO TYPICAL APPLICATI S 12V Lamp Driver/Circuit Breaker with Auto-Reset 12V Relay Driver with Over-Current Protection and Status Feedback 12V + + 100µF 470µF IN 10k VS 2Ω 0.02Ω 100k IN 5V CT DS 0.33µF STATUS G 0.01µF CT 1µF 0.
PAGE 13
LTC1153 UO TYPICAL APPLICATI S “4 Cell-to-5V” Regulator with 2A Current Limit, Auto-Reset, Ramped Turn-On and 10µA Standby Current + + 4-CELL BATTERY PACK 100µF ON/OFF IN VS CT DS 51k 0.47µF STATUS IRLR024 1N4148 200pF LTC1153 STATUS 0.05Ω 100k 100k 10k 8 G 0.22µF GND 1 3 LT1431 7 SD 6 5V/1A 4 + 470µF ESR < 0.5Ω 5 LTC1153 • TA11 12V Step-Up Regulator with Soft Start, Auto-Reset Circuit Breaker (Pre-Regulator), Status Feedback and 10µA Standby Current 0.
PAGE 14
LTC1153 UO TYPICAL APPLICATI S Auto-Reset Circuit Breaker with Programmable (1-6) Number of Retries Using Binary Counter 5V TO 18 V + 100µF ON/OFF 0.1Ω IN VS 5V 11 4 LOAD CT 16 VCC UP 74C193 CARRY QD ABCDGND 15 1 10 9 5 12 LTC1153 STATUS 100k 1N4148 DS 0.47µF Z5U 100k 100k G IRF530 12V 7 GND SD + 0.
PAGE 15
LTC1153 U PACKAGE DESCRIPTIO N8 Package 8-Lead Plastic Lead 0.300 – 0.320 (7.620 – 8.128) 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.127) 8 7 6 5 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) ( 0.400 (10.160) MAX +0.025 0.325 –0.015 +0.635 8.255 –0.381 0.250 ± 0.010 (6.350 ± 0.254) 0.045 ± 0.015 (1.143 ± 0.381) ) 0.100 ± 0.010 (2.540 ± 0.254) 0.125 (3.175) MIN 0.020 (0.508) MIN 1 2 3 4 0.018 ± 0.003 (0.457 ± 0.076) N8 0392 S8 Package 8-Lead Plastic SOIC 0.189 – 0.
PAGE 16
LTC1153 U.S. Area Sales Offices NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.