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LT1521IS8 Datasheet(PDF) 8 Page - Linear Dimensions Semiconductor |
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LT1521IS8 Datasheet(HTML) 8 Page - Linear Dimensions Semiconductor |
8 / 16 page 8 LT1521/LT1521-3 LT1521-3.3/LT1521-5 1521335fb TYPICAL PERFORMANCE CHARACTERISTICS OUT (Pin 1): The output pin supplies power to the load. A minimum output capacitor of 1.5 µF is required to prevent oscillations, but larger values of output capacitor will be necessary to deal with larger load transients. See the Applications Information section for more on output capacitance and reverse output characteristics. SENSE (Pin 2): For fixed voltage versions of the LT1521 (LT1521-3, LT1521-3.3, LT1521-5), the sense pin is the input to the error amplifier. Optimum regulation will be obtained at the point where the sense pin is connected to PIN FUNCTIONS LT1521-5 Transient Response TIME ( µs) 0 0.2 0.1 0 –0.1 –0.2 150 100 50 400 LT1521 • TPC33 100 50 150 250 350 450 200 300 500 VIN = 6V CIN = 0.1µF COUT = 1.5µF FREQUENCY (Hz) 100 90 80 70 60 50 40 30 20 10 0 10 1k 10k 1M LT1521 • TPC31 100 100k ILOAD = 150mA VIN = 6V + 50mVRMS RIPPLE COUT = 33µF SOLID TANTALUM COUT = 3.3µF SOLID TANTALUM Ripple Rejection Load Regulation TEMPERATURE ( °C) –50 25 LT1521 • TPC32 –25 0 50 0 –5 –10 –15 –20 –25 –30 –35 –40 75 100 125 ∆ILOAD = 1mA TO 300mA LT1521-3.3 LT1521-3 LT1521* LT1521-5 VIN = VOUT (NOMINAL + 1V) *VADJ = VOUT LT1521-5 Transient Response TIME (ms) 0 0.2 0.1 0 –0.1 –0.2 300 200 100 4.0 LT1521 • TPC34 1.0 0.5 1.5 2.5 3.5 4.5 2.0 3.0 5.0 VIN = 6V CIN = 0.1µF COUT = 33µF the output pin of the regulator. In critical applications small voltage drops caused by the resistance (RP) of PC traces between the regulator and the load, which would normally degrade regulation, may be eliminated by connecting the sense pin to the output at the load as shown in Figure 1 (Kelvin Sense Connection). Note that the voltage drop across the external PC traces will add to the dropout voltage of the regulator. The sense pin bias current is 5 µA at the nominal regulated output voltage. This pin is inter- nally clamped to – 0.6V (one VBE). |
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