Fifth Generation DC/DC Buck Regulators with Adaptable Light Load Capability  

Alpha and Omega Semiconductor Continues to Expand its Fifth Generation EZBuck™ Family

Alpha and Omega Semiconductor Limited 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  DFN3x3 exposed pad package, delivering an output current of 2A and 3A, 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 10mA 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).

The small standby current combined with a thermally enhanced package achieves better efficiency and thermal performance over the previous generation solution and leading competitor.

Today’s consumer electronics products are built with features that require flexibility to meet a broad range of applications. Design engineers are looking for dc-dc converters that offer high light load efficiency at specific voltage ranges,” said Kenny Hu, Power IC Marketing Manager at AOS.  “The AOZ6662DI-01 and AOZ6663DI-01 meet these design challenges with adaptable light load capability.”

Technical Highlights


AOZ6663DI-01 Major Competitor
Input Range 4.5V to 18V 4.5V to 17V
Feedback Tolerance ±1.5% ± 2%
Package Exposed Pad DFN3x3 SOT23-6
Light Load Efficiency at 10mA (Vin=12V, Vout=5V) 87.1% 84.7%
Thermal Impedance 50 oC/W 93 oC/W
Thermal (3A) at 15W 84°C 121°C


Device Specification Table

Part Number Operating Min VIN(V) Operating Max VIN(V) Max Load Current (A) Min VOUT


Frequency (KHz) Light

Load Features

Quiescent Current (uA) Package
AOZ6662DI 4.5 18 2 0.6 750 Yes 250 DFN 3×3-8L
AOZ6663DI 4.5 18 3 0.6 750 Yes 250 DFN 3×3-8L
AOZ6662DI-01 4.5 18 2 0.6 750 Adaptable 250 DFN 3×3-8L
AOZ6663DI-01 4.5 18 3 0.6 750 Adaptable 250 DFN 3×3-8L
AOZ6622DI 4.5 18 2 0.8 550 Yes 550 DFN 3×3-8L
AOZ6623DI 4.5 18 3 0.8 550 Yes 550 DFN 3×3-8L


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.