1.6V nominal Figure 3. LTC1703-based regulator with active voltage positioning implemented with a sense resistor Figure 4. In Figure 4, the voltage positioning is set by the DC resistance of the power inductor, which is approximately 2.5m W . Likewise, a 390k resistor, R21, is added between the FB1 pin and ground. LTC1703 transient response with active voltage positioning Conclusion Active voltage positioning, by forcing the output voltage to change as a function of load, reduces the number of output capacitors required.
Fewer capacitors result in a smaller, less expensive regulator.