UCC2540 is a high efficiency, high current, low output voltage secondary-side synchronous Buck PWM controller from TI. It is suitable for secondary-side post regulation (SSPR) applications for multiple output power supplies, as well as cascaded Buck converters and bus converter/DC transformer architectures.
The UCC2540 is a secondary‑side synchronous buck PWM controller designed for high‑current, low‑output‑voltage applications. It features on‑chip Predictive Gate Drive™ for secondary‑side post‑regulation, dual +3‑A TrueDrive™ outputs, 1‑MHz switching capability, and built‑in over‑current protection.
The device is offered in a thermally enhanced HTSSOP‑20 PowerPAD™ (PWP) package, operates from –40 °C to 105 °C, and supports a supply voltage range of 4.5 V to 36 V. Typical applications include isolated DC‑DC converters, cascaded buck topologies, and multi‑output power supplies.
| Supply voltage range (VDD) | 4.5 V to 36 V |
|---|---|
| Peak sink current (G1, G2) | 3.5 A |
| Package type | HTSSOP‑20 PowerPAD™ (PWP) |
| Maximum switching frequency | 1 MHz |
The device can be powered up to 36 V.