Advanced Analogic Technologies (AnalogicTech) says it has introduced the first integrated power solution to conform to the emerging USB On-The-Go (OTG) specification. Using a high efficiency charge pump topology, the AAT3125 regulates output voltage to 5 V and supplies up to 100 mA output current. Additionally, all voltage monitoring functionality is integrated to ensure OTG-protocol compatibility.
An addendum to the widely implemented USB 2.0 standard, USB OTG was developed to allow mobile devices and peripherals to communicate with each other without the aid of a PC. Portable devices and peripherals conforming to the spec circumvent the need for PC control by dynamically negotiating a master/slave or 'host/peripheral' relationship. By simplifying the device-to-device interface, USB OTG is expected to open up a wide range of new applications for mobile devices.
To meet the requirements of USB OTG, dual role devices must supply a minimum of 8 mA on the 5 V bus to maintain compatibility with the existing USB standard. In addition, the system must be able to step up battery voltage to 5 V with maximum efficiency to preserve battery run time. The company says that the AAT3125, running at 1 MHz, regulates output voltage to 5 V and ensures power supply between 8 mA and 100 mA. Moreover, the device's high switching frequency allows the use of smaller capacitors, which contribute to a smaller footprint, a key consideration in mobile device design.
The AAT3125 also monitors the Vbus to support the USB OTG session request protocol (SRP). Two PowerOK detectors on the chip confirm the bus is in regulation while session detect and session ready detectors manage the communications protocol outlined in the new standard. The chip also features reverse load, output short circuit, thermal protection and under voltage protection circuits. When the AAT3125 is disabled, the Session Detect monitor remains active while the charge pump is turned off and power consumption is reduced to a minimal 1 µA.
Samples and a demo board for the AAT3125 are available. The device comes in a 16-pin 4x4 mm QFN package.
For more information contact Stephen Delport, Hi-Q Electronics, 021 595 1307, [email protected]
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