The UCC2585/UCC3585 synchronous Buck controller provides flexible high efficiency power conversion for output voltages as low as 1.25V with guaranteed ±1% DC accuracy. Output currents are only limited by the choice of external logic level MOSFETs. With an input voltage range of 2.5V to 6.0V it is the ideal choice for 3.3V only, battery input, or other low voltage systems. Applications include local microprocessor core voltage power supplies for desktop and Notebook computers, and high speed GTL bus regulation. Its fixed frequency oscillator is capable of providing practical PWM operation to 700kHz. With its low voltage capability and inherent “always on” operation, the UCC2585/UCC3585 causes VOUT to track VIN once VIN has exceeded the threshold voltage of the external P channel MOSFET. Tracking can be tailored for any application with a single resistor or disabled by connecting TRACK to VIN. For dual supply rail microprocessors this feature negates the need for external diodes to insure supply voltage tracking between the +3.3V and lower voltage microprocessor core supplies.
The UCC2585/UCC3585 are low voltage synchronous Buck controllers designed for high efficiency power conversion with guaranteed +1% DC accuracy. They support an input supply range of 2.5V to 6V and drive both P-channel (high side) and N-channel (low side) MOSFETs.
| Output Voltage Range | 1.25V to 4.5V |
|---|---|
| Input Supply Range | 2.5V to 6V |
| DC Accuracy | 1% |
| Supply Current (Active) | 2.3 mA to 3.5 mA |
| Oscillator Frequency Initial Accuracy | 405 kHz to 495 kHz |
| Operating Junction Temperature (UCC3585) | -55°C to +125°C |
The UCC2585/UCC3585 supports an input voltage range of 2.5V to 6.0V.
The output voltage is programmable using a resistor, allowing settings from 1.25V to 4.5V.
They drive both P-channel (high side) and N-channel (low side) MOSFETs.