18 V Synchronous DC/DC Buck Regulators with Adaptable Light Load Capability
Alpha and Omega Semiconductor (AOS) introduced AOZ6662DI-01 and AOZ6663DI-01, high efficiency, simple-to-use synchronous buck regulators. The AOZ6662DI-01 and AOZ6663DI-01 are both available in a thermally enhanced DFN3×3 exposed pad package, delivering an output current of 2 A and 3 A, respectively. The new devices offer a low on-resistant power stage, allowing cooler power conversion for a variety of consumer electronics application such as LCD TVs, set-top boxes, as well as DVD players and recorders.
The low on-resistance of the internal power MOSFETs in these devices allows higher efficiency and less heat generation. They have over 90 percent efficiency at full load operation and maintain at 87 percent efficiency while in 10 mA light load operation. When operating in low output current conditions, the device will run in a proprietary pulse energy mode (PEM) to obtain high efficiency. Under heavy load steady-state conditions, the device will operate in a fixed frequency and Continuous-Conduction Mode (CCM).
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| Efficiency vs. Load Current. (AOZ6662DI-01, VIN = 12 V.). |
The small standby current combined with a thermally enhanced package achieves better efficiency and thermal performance over the previous generation solution and leading competitor.
Technical Highlights
| AOZ6663DI-01 | Major Competitor | |
| Input Range | 4.5 V to 18 V | 4.5 V to 17 V |
| Feedback Tolerance | ±1.5% | ±2% |
| Package | Exposed Pad DFN3x3 | SOT23-6 |
| Light Load Efficiency at 10 mA (VIN = 12 V, VOUT = 5 V) | 87.1% | 84.7% |
| Thermal Impedance | 50 °C/W | 93 °C/W |
| Thermal (3 A) at 15 W | 84 °C | 121 °C |
Pricing and Availability
The AOZ6662DI-01 and the AOZ6663DI-01 are immediately available in production quantities with a lead-time of 12 weeks. The unit price for 1,000 pieces is $0.42 for the AOZ6662DI-01 and $0.52 for the AOZ6663DI-01.
