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LT1579CS8-5 Datasheet(PDF) 9 Page - Linear Technology |
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LT1579CS8-5 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 20 page  9 LT1579 TYPICAL PERFORMANCE CHARACTERISTICS FREQUENCY (Hz) 10 40 50 60 70 80 100 1k 10k 100k 1M 1579 G30 30 20 10 0 90 100 COUT = 47µF SOLID TANTALUM COUT = 4.7µF SOLID TANTALUM ILOAD = 150mA VIN = 6V + 50mVRMS RIPPLE Ripple Rejection PIN FUNCTIONS VIN1: The primary power source is connected to VIN1. A bypass capacitor is required on this pin if the device is more than six inches away from the main input filter capacitor. In general, the output impedance of a battery rises with frequency, so it is advisable to include a bypass capacitor in battery-powered circuits. A bypass capacitor in the range of 1 µF to 10µF is sufficient. VIN2: The secondary power source is connected to VIN2. A bypass capacitor is required on this pin if the device is more than six inches away from the main input filter capacitor. In general, the output impedance of a battery rises with frequency, so it is advisable to include a bypass capacitor in battery-powered circuits. A bypass capacitor in the range of 1 µF to 10µF is sufficient. OUT: The output supplies power to the load. A minimum output capacitor of 4.7 µF is required to prevent oscilla- tions. Larger output capacitors will be required for appli- cations with large transient loads to limit peak voltage transients. ADJ: For the adjustable LT1579, this is the input to the error amplifier. This pin is internally clamped to 7V and – 0.6V (one VBE). It has a bias current of 6nA which flows 6V 5V VIN1 VOUT 50mV/DIV UNPLUG VIN1 REPLACE VIN1 LT1579-5 “Hot” Plugging and Unplugging Transient Response TIME (ms) 0 –50 50 0.8 1579 G34 200 –100 0 100 300 100 0.2 0.4 0.6 0.1 0.9 0.3 0.5 0.7 1,0 VIN = 6V CIN = 1µF CERAMIC COUT = 22µF TANTALUM LT1579-5 Transient Response LT1579-5 Transient Response TIME ( µs) 0 –50 50 400 1579 G33 100 50 –100 0 100 75 25 0 100 200 300 50 450 150 250 350 500 VIN = 6V CIN = 1µF CERAMIC COUT = 4.7µF TANTALUM Load Regulation TEMPERATURE ( °C) –50 –2 25 1579 G40 –8 –12 –25 0 50 –14 –16 0 –4 –6 –10 75 100 125 ∆ILOAD = 1mA TO 300mA LT1579 LT1579-5 LT1579-3.3 LT1579-3 |
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