New synchronous buck regulator with enhanced light load efficiency and lower output voltage
Alpha and Omega Semiconductor (AOS) announced the release of the AOZ6605, a high efficiency and simple-to-use synchronous step-down regulator with PWM switching frequency of 650 kHz and input voltage range of 4.5 V to 18 V. The solution is ideal for consumer, networking and industrial applications such as LCD TVs, set-top boxes, cable modems, and power supplies.
Leveraging AOS's co-package EZBuck™ design, the AOZ6605 integrates a 55 mΩ high-side and 12 mΩ low-side MOSFET, and provides 5 A of continuous output current at over 90% efficiency and maintains it at 86% efficiency while in 10 mA light load operation.
When operating in low output current conditions, the AOZ6605 will operate in an ultra pulse energy mode (U-PEM) to obtain high efficiency. Under heavy load steady-state conditions, the AOZ6605 will operate in fixed frequency and Continuous-Conduction Mode (CCM).
Technical Highlights
| AOZ6605 | Major Competitor | |
| Input Range | 4.5 V to 18 V | 4.5 V to 18 V |
| FET On-resistance (typ) | High-side: 55 mOhms Low-side: 12 mOhms |
High-side: 68 mOhms Low-side: 37 mOhms |
| Package | Epad-SO8 | Epad SO-8 |
| Efficiency at 5 A | 92% | 89% |
| Thermal (5 A) | 70.9 °C | 74.9 °C |
Device Spec Table
| Part Number | Operating Min (V) |
Operating Max (V) |
Max Load Current (A) |
Min VOUT (V) |
Frequency (kHz) |
Light Load Features |
Soft Start |
Package |
| AOZ6643 | 4.5 | 18 | 3 | 0.8 V | 500 | No | Internal | DFN3X3-8L |
| AOZ6622 | 4.5 | 18 | 2 | 0.8 V | 550 | Yes | Internal | DFN3X3-8L |
| AOZ6623 | 4.5 | 18 | 3 | 0.8 V | 550 | Yes | Internal | DFN3X3-8L |
| AOZ6605 | 4.5 | 18 | 5 | 0.6 V | 650 | Yes | External | DFN3X3-8L |
Pricing and Availability
The AOZ6605 is immediately available in production quantities with a lead-time of 12 weeks. The unit price of 1,000 pieces is $1.30.
