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LT1370CT7 Datasheet(PDF) 5 Page - Linear Technology |
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LT1370CT7 Datasheet(HTML) 5 Page - Linear Technology |
5 / 16 page 5 LT1370 TYPICAL PERFORMANCE CHARACTERISTICS TEMPERATURE ( °C) –50 400 500 600 150 LT1370 • G11 300 200 0 0 50 100 100 800 700 –25 25 75 125 VFB =VREF Feedback Input Current vs Temperature TEMPERATURE ( °C) –50 –50 –30 0 0 50 75 LT1370 • G12 –40 –10 –20 –25 25 100 125 150 VNFB =VNFR Negative Feedback Input Current vs Temperature VC Pin Threshold and High Clamp Voltage vs Temperature TEMPERATURE ( °C) –50 1.0 1.4 2.2 0 50 75 LT1370 • G10 1.2 1.8 2.0 1.6 –25 25 100 125 150 VC HIGH CLAMP VC THRESHOLD PIN FUNCTIONS VC: The Compensation pin is used for frequency compen- sation, current limiting and soft start. It is the output of the error amplifier and the input of the current comparator. Loop frequency compensation can be performed with an RC network connected from the VC pin to ground. See Applications Information. FB: The Feedback pin is used for positive output voltage sensing and oscillator frequency shifting. It is the invert- ing input to the error amplifier. The noninverting input of this amplifier is internally tied to a 1.245V reference. NFB: The Negative Feedback pin is used for negative output voltage sensing. It is connected to the inverting input of the negative feedback amplifier through a 100k source resistor. S/S: Shutdown and Synchronization Pin. The S/S pin is logic level compatible. Shutdown is active low and the shutdown threshold is typically 1.3V. For normal opera- tion, pull the S/S pin high, tie it to VIN or leave it floating. To synchronize switching, drive the S/S pin between 600kHz and 800kHz. See Applications Information. VIN: Bypass Input Supply Pin with a Low ESR Capacitor, 10 µF or More. The regulator goes into undervoltage lock- out when VIN drops below 2.5V. Undervoltage lockout stops switching and pulls the VC pin low. VSW: The Switch pin is the collector of the power switch and has large currents flowing through it. Keep the traces to the switching components as short as possible to minimize radiation and voltage spikes. GND: Tie all ground pins to a good quality ground plane. See Applications Information. |
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