The UC385 is a low dropout linear regulator that responds quickly to fast load changes. It has a precision onboard reference and excels at driving GTL and BTL buses. Due to its fast response to load transients, the total capacitance required to decouple the regulator's output can be significantly decreased compared to standard LDO linear regulators. The dropout voltage (VIN to VOUT) is only 490mV maximum and 350mV typical at a 5A load (0°C to 100°C). The onboard bandgap reference is stable with temperature and scaled for a 1.2V input to the internal power amplifier. The UC385 is available in fixed output voltages of 1.5V, 2.1V, or 2.5V. The output voltage of the adjustable version can be set with two external resistors. If the external resistors are omitted, the output voltage defaults to 1.2V.
The UC285 and UC385 are low-dropout linear regulators designed to provide a quick response to fast load changes. They feature a precision onboard bandgap reference and are optimized for driving GTL and BTL buses. The devices are available in fixed output voltages of 1.5 V, 2.1 V, and 2.5 V, as well as an adjustable version that defaults to 1.2 V if external resistors are omitted.
| Maximum Load Current | 5 A |
|---|---|
| Maximum Dropout Voltage (VIN to VOUT) | 500 mV |
| Fixed Output Voltages | 1.5 V, 2.1 V, 2.5 V |
| Default Adjustable Output Voltage | 1.2 V |
| Operating Temperature Range (UC385) | 0°C to 100°C |
| Operating Temperature Range (UC285) | -40°C to 100°C |
The maximum load current is 5 A.
The maximum dropout voltage is 500 mV at a 5-A load.
The fixed output voltage options are 1.5 V, 2.1 V, and 2.5 V.