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LTC1643L-1CGN Datasheet(PDF) 6 Page - Linear Technology |
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LTC1643L-1CGN Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  6 LTC1643L/LTC1643L-1/LTC1643H TYPICAL PERFORMANCE CHARACTERISTICS VEE Current Foldback vs Temperature ISINK (mA) 0 6 10 1643 G27 24 8 800 700 600 500 400 300 200 100 0 FAULT PWRGD VOL vs ISINK (25°C) TIMER (Pin 4): Analog Current Fault Inhibit Timing Input. Connect a capacitor from TIMER to GND. With the chip turned off (ON = GND or ON = High) or the internal circuit breaker tripped (FAULT = GND), the TIMER pin is internally held at GND. When the chip is turned on, a 20 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 0.9V of 12VIN. ON/ON (Pin 5): Digital Input.The LTC1643L/LTC1643L-1 have an active low enable, ON, and the LTC1643H has an active high enable, ON. When the ON pin is pulled high or PIN FUNCTIONS 12VIN (Pin 1): 12V Supply Input. It powers all the chip’s internal circuitry. A 0.5 Ω switch is connected 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 9.5V typically. VEEIN (Pin 2): – 12V Supply Input. A 1.2Ω switch is connected between VEEIN and VEEOUT with a fold-back current limit. 3VOUT (Pin 3): Analog Input. Used to monitor the 3.3V output supply voltage. The PWRGD signal cannot go high until the 3VOUT pin exceeds 2.9V typically. TEMPERATURE ( °C) 70 60 50 40 30 20 10 0 LT1643 G24 –50 25 75 –25 0 50 100 125 3VOUT = 3.3V 3VOUT = 0V 3VIN Foldback Current Limit Voltage vs Temperature TEMPERATURE ( °C) –50 2.454 2.452 2.450 2.448 2.446 2.444 2.442 25 75 1643 G21 –25 0 50 100 125 3VIN Undervoltage Lockout vs Temperature TEMPERATURE ( °C) –50 600 500 400 300 200 100 0 25 75 1643 G25 –25 0 50 100 VEEOUT = –12V VEEOUT = 0V TEMPERATURE ( °C) 70 60 50 40 30 20 10 0 LT1643 G23 –50 25 75 –25 0 50 100 125 5VOUT = 5V 5VOUT = 0V 5VIN Foldback Current Limit Voltage vs Temperature 12V Current Foldback vs Temperature TEMPERATURE ( °C) –50 1200 1000 800 600 400 200 0 25 75 1643 G26 –25 0 50 100 12VOUT = 12V 12VOUT = 0V |
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