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LT1374CS8-5 Datasheet(PDF) 4 Page - Linear Technology |
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LT1374CS8-5 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 32 page  4 LT1374 1374fb Switch Voltage Drop SWITCH CURRENT (A) 0 250 200 400 125 °C 25 °C 350 300 45 1374 G18 150 100 50 0 1 2 3 500 450 –40 °C Feedback Pin Voltage TEMPERATURE ( °C) –50 2.430 2.425 2.420 2.415 2.410 100 1374 G03 –25 0 25 50 75 125 Switch Peak Current Limit DUTY CYCLE (%) 0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 80 1374 G02 20 40 60 100 TYPICAL MINIMUM Shutdown Pin Bias Current TEMPERATURE ( °C) –50 500 400 300 200 8 4 0 25 75 1374 G04 –25 0 50 100 125 CURRENT REQUIRED TO FORCE SHUTDOWN (FLOWS OUT OF PIN). AFTER SHUTDOWN, CURRENT DROPS TO A FEW µA AT 2.38V STANDBY THRESHOLD (CURRENT FLOWS OUT OF PIN) Standby and Shutdown Thresholds Shutdown Supply Current JUNCTION TEMPERATURE ( °C) –50 2.40 2.36 2.32 0.8 0.4 0 25 75 1374 G05 –25 0 50 100 125 STANDBY START-UP SHUTDOWN INPUT VOLTAGE (V) 0 25 20 15 10 5 0 5 101520 1374 G06 25 VSHDN = 0V Note 5: Boost current is the current flowing into the boost pin with the pin held 5V above input voltage. It flows only during switch on time. Note 6: VIN supply current is the current drawn when the BIAS pin is held at 5V and switching is disabled. If the BIAS pin is unavailable or open circuit, the sum of VIN and BIAS supply currents will be drawn by the VIN pin. Note 7: Switch on resistance is calculated by dividing VIN to VSW voltage by the forced current (4.5A). See Typical Performance Characteristics for the graph of switch voltage at other currents. ELECTRICAL CHARACTERISTICS Note 8: Transconductance and voltage gain refer to the internal amplifier exclusive of the voltage divider. To calculate gain and transconductance, refer to the SENSE pin on the fixed voltage parts. Divide values shown by the ratio VOUT/2.42. Note 9: Slope compensation is the current subtracted from the switch current limit at 80% duty cycle. See Maximum Output Load Current in the Applications Information section for further details. TYPICAL PERFOR A CE CHARACTERISTICS |
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