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LTC6655CHMS8-3 Datasheet(PDF) 11 Page - Linear Technology |
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LTC6655CHMS8-3 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 22 page  LTC6655 6655fa 3.5V 3V VIN VOUT 50mV/DIV COUT = 3.3µF 6655 F04 400µs/DIV applicaTions inForMaTion The choice of output capacitor also affects the bandwidth of the reference circuitry and resultant noise peaking. As shown in Figure 1, the bandwidth is inversely proportional to the value of the output capacitor. Noise peaking is related to the phase margin of the output buffer.Higherpeakinggenerallyindicateslowerphasemar- gin. Other factors affecting noise peaking are temperature, input voltage, and output load current. Start-Up and Load Transient Response Results for the transient response plots (Figures 3 to 8) were produced with the test circuit shown in Figure 2 unless otherwise indicated. The turn-on time is slew limited and determined by the short-circuit current, the output capacitor, and output voltage as shown in the equation: t V C I ON OUT OUT SC = • For example, the LTC6655-2.5V, with a 3.3µF output capacitor and a typical short-circuit current of 20mA, the start-up time would be approximately: 2 5 3 3 10 0 02 412 6 . • . • . – V F A µs = The resulting turn-on time is shown in Figure 3. Here the output capacitor is 3.3µF and the input capacitor is 0.1µF. Figure 4 shows the output response to a 500mV step on VIN. The output response to a current step sourcing and sinking is shown in Figures 5 and 6, respectively. Figure 7 shows the output response as the current goes from sourcing to sinking. Shutdown Mode The LTC6655 family of references can be shut down by tying the SHDN pin to ground. There is an internal pull-up resistor tied to this pin. If left unconnected this pin rises to VIN and the part is enabled. Due to the low internal pull-up current, it is recommended that the SHDN pin be pulled high externally for normal operation to prevent accidental LTC6655-2.5 100 VOUT 1,2 7 6 3,4,5,8 CIN 0.1µF COUT 3.3µF VGEN 6655 F02 0.5V VIN 3V Figure 2. Transient Load Test Circuit Figure 3. Start-Up Response Figure 4. Output Response with a 500mV Step On VIN Figure 1. Output Voltage Noise Spectrum VIN 2V/DIV VOUT 1V/DIV COUT = 3.3µF 6655 F03 200µs/DIV COUT = 100µF FREQUENCY (kHz) 60 100 0.01 10 100 1000 0 20 0.1 1 120 80 40 6655 F01 COUT = 2.7µF COUT = 10µF |
Similar Part No. - LTC6655CHMS8-3 |
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Similar Description - LTC6655CHMS8-3 |
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