LTC1154 Linear Technology, LTC1154 Datasheet
LTC1154
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LTC1154 Summary of contents
Page 1
... PTC thermistor for thermal shutdown. An open-drain output is provided to report switch status to the P. An active low enable input is provided to control multiple switches in banks. The LTC1154 is available in both 8-pin DIP and 8-pin SOIC packages. 0.036 * 2.7A MAX ...
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... Drain Sense Threshold Voltage SEN I Drain Sense Input Current SEN Current (Any Pin).................................................. 50mA Operating Temperature LTC1154C .............................................. Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec.)................ 300 ORDER PART NUMBER IN 1 ENABLE 2 LTC1154CN8 STATUS 3 ...
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... U TYPICAL PERFOR A Standby Supply Current 25° SUPPLY VOLTAGE (V) LTC1154 • TPC01 V = 4.5V to 18V CONDITIONS 12V 400 A STAT V = 12V STAT 1000pF S GATE Time for V > ...
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... GATE – SEN S NO EXTERNAL DELAY SUPPLY VOLTAGE (V) Input ON Threshold Voltage 2.4 2.2 2.0 1.8 1 18V S 1.O 0.8 0.6 0.4 125 – –25 TEMPERATURE (° LTC1154 • TPC06 20 LTC1154 • TPC09 100 125 LTC1154 • TPC12 ...
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... CTIO S Input and Shutdown Pins The LTC1154 input pin is active high and activates all of the protection and charge pump circuitry when switched ON. The shutdown pin is designed to immediately disable the switch if a secondary fault condition (over temperature, etc.) is detected. The LTC1154 logic and shutdown inputs ...
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... The status pin is an open-drain output which is driven low whenever a fault condition is detected. A 51k pull-up resistor should be connected between this output and a logic supply. The status pins of multiple LTC1154s can be OR’d together if independent fault sensing is not required. No connection is required to this pin when not in use. ...
Page 7
... The charge pump capacitors are included on chip and therefore no external components are required to generate the gate drive. Drain Current Sense The LTC1154 is configured to sense the current flowing into the drain of the power MOSFET in a high-side applica- tion. An internal 100mV reference is compared to the drop across a sense resistor (typically 0.002 series with the drain lead ...
Page 8
... FOR ATIO MOSFET and Load Protection The LTC1154 protects the power MOSFET switch by removing drive from the gate as soon as an over-current condition is detected. Resistive and inductive loads can be protected with no external time delay in series with the drain sense pin. Lamp loads, however, require that the ...
Page 9
... This dramatically reduces the start-up cur- rent flowing into the supply capacitor(s) which, in turn, reduces supply transients and allows for slower activation of sensitive electrical loads. (Diode, D1, provides a direct path for the LTC1154 protection circuitry to quickly dis- charge the gate in the event of an over-current condition). 12V + ...
Page 10
... The 5V P (or control logic) is protected by the 10k resistors in series with the input and status pins. Current Limited Power Supplies The LTC1154 requires at least 3.5V at the supply pin to 1N4148 0.036 ensure proper operation therefore necessary that the 100k supply to the LTC1154 be held higher than 3 ...
Page 11
... DROPS BY 0.6V large output capacitors on many switching regulators may be able to hold the supply pin of the LTC1154 above 3.5V sufficiently long that this extra filtering is not required. Because the LTC1154 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 accu- racy of the 100mV drain sense threshold voltage ...
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... High-Side Relay Driver with Over-Current Protection and Status Feedback 12V + 100 F 2 10k 0.01 F 1N4148 EN DS MTD3055E LTC1154 † STATUS G 15V GND SD 1N4001 0.036 IRLR024 200pF 10k 5V/2A LT1431 470 F ESR < 0 LTC1154 • TA09 0.02 TO 12V LOAD LTC1154 • TA08 ...
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... EN DS LTC1154 STATUS G GND LTC1154 STATUS G GND LTC1154 STATUS G GND SD LTC1154 12V + 100 470 F IRLR024 15V OUTPUT 1 IRLR024 15V OUTPUT 2 IRLR024 15V OUTPUT 3 120k IRLR024 15V OUTPUT 4 PTC 15V THERMISTOR (100°C)* LTC1154 • TA10 13 ...
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... ON/OFF IN 51k EN 1.24k 1% LTC1154 STATUS STATUS GND 1N5820 10.72k 150 LT1070 2 FB GND 1.24k 1N4148 V S 10k 0.1 F 1N4148 DS 100k 100k G 12V SD + 0.22 F 12V/1A 330 F LTC1154 • TA11 0.1 IRF530 12V/ LTC1154 • TA12 ...
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... VN2222LL 200k GND SD PTC THERMISTOR (100°C)* Auto-Reset and Load Soft-Start + 100 F 20 10k + 0 LTC1154 100k STATUS G GND SD LTC1154 0.036 MTP12N06 18V 12V LOAD LTC1154 • TA13 1N5817 MTD3055EL 4.25V/ 1N4148 1N4148 100k 0.22 F LTC1154 • TA14 15 ...
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... LTC1154 PACKAGE DESCRIPTIO 0.300 – 0.320 (7.620 – 8.128) 0.065 (1.651) 0.009 – 0.015 TYP (0.229 – 0.381) +0.025 0.045 ± 0.015 0.325 –0.015 (1.143 ± 0.381) +0.635 8.255 –0.381 0.100 ± 0.010 (2.540 ± 0.254) 0.010 – 0.020 45 (0.254 – ...