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LTC1644IGN 数据表(PDF) 8 Page - Linear Technology |
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LTC1644IGN 数据表(HTML) 8 Page - Linear Technology |
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8 / 24 page ![]() LTC1644 8 1644f TYPICAL PERFOR A CE CHARACTERISTICS 3VOUT Discharge Resistance vs Temperature 12VOUT Discharge Resistance vs Temperature VEEOUT Discharge Resistance vs Temperature VOL vs Temperature Precharge Reference Voltage vs Temperature TEMPERATURE ( °C) –50 0 10 30 40 50 50 90 1644 G37 20 0 –25 75 25 100 60 70 8O TEMPERATURE ( °C) –50 0 100 300 400 500 50 900 1644 G39 200 0 –25 75 25 100 600 700 80O TEMPERATURE ( °C) –50 700 600 500 400 300 200 100 0 25 75 1644 G38 –25 0 50 100 TEMPERATURE ( °C) –50 0 0.05 0.10 0.15 0.20 0.30 –25 025 50 1644 G40 75 100 0.25 I = 3mA FAULT RESETOUT PWRGD TEMPERATURE ( °C) –50 1.002 1.003 1.004 1.005 –25 025 50 1644 G41 75 100 V5VIN = 5V 12VIN (Pin 1): 12V Supply Input. A 0.5Ω switch is con- nected between 12VIN and 12VOUT with a foldback current limit. An undervoltage lockout circuit prevents the switches from turning on while the 12VIN pin voltage is less than 8.3V. 12VIN also provides power to the LTC1644’s internal circuitry. VEEIN (Pin 2): –12V Supply Input. A 1Ω switch is con- nected between VEEIN and VEEOUT with a foldback current limit. If no VEE supply input is available, tie the VEEIN pin to the GND pin in order to disable the VEEOUT power good function. PI FU CTIO S 5VOUT (Pin 3): 5V Output Sense. The PWRGD pin will not pull low until the 5VOUT pin voltage exceeds 4.62V. If no 5V input supply is available, tie the 5VOUT pin to the 3VOUT pin in order to disable the 5VOUT power good function. TIMER (Pin 4): Current Fault Inhibit Timing Input. Connect a capacitor from TIMER to GND. With the chip turned off (OFF/ON = HIGH), the TIMER pin is internally held at GND. When the chip is turned on, a 21 µA pull-up current source is connected to TIMER. Current limit faults will be ignored until the voltage at the TIMER pin rises to within 1V of 12VIN. |
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