Demonstration circuit 1434 is an adjustable 5A linear regulator featuring the LT3071. The LT3071 is a low dropout voltage, UltraFast™ transient response linear regulator. The device supplies up to 5A of output current with a typical dropout voltage of 85mV. A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS. The LT3071’s high bandwidth permits the use of low ESR ceramic capacitors. Output voltage is digitally selectable in 50mV increments over a 0.8V to 1.8V range. The demo board has a 1.32V to 3V input voltage range and a 2.2V to 3.6V BIAS voltage range. An analog margining function allows the user to adjust system output voltage over a continuous ±10% range. To maintain proper performance and regulation, the BIAS supply voltage must be higher than the IN supply voltage. For a given VOUT, the BIAS voltage must satisfy the following conditions: 2.2 ≤ VBIAS ≤ 3.6V and VBIAS ≥ (1.25 · VOUT + 1V).
For VOUT ≤ 0.95V, the minimum bias voltage is limited to 2.2V.