Boost converter simplifies USB host operations

2 May 2007 Power Electronics / Power Management

As a growing number of handheld devices operating off a single-cell lithium-ion battery add higher levels of processing power and begin to serve as central computing platforms, users are demanding connectivity to other peripheral devices. By integrating a boost converter with a current-limiting load switch, AnalogicTech's new power management IC allows designers to boost voltage and provide the protection needed to simply and efficiently host a USB port on these portable systems.

According to AnalogicTech, the AAT1275 is a new type of power management IC that combines a 500 mA boost converter with a current-limiting load switch. By bringing together a regulated 5 V, 500 mA output with current limit protection in a single monolithic device, the AAT1275 simplifies the development of host USB ports in portable electronics systems powered from a single-cell Lithium-ion battery.

Operating from a 2,7 to 5 V input range, this device supports both USB 2.0 host port and USB On-The-Go operation in single-cell Li-ion battery powered systems. While the load switch current limit defaults to the standard USB 500 mA limit, it can be programmed to lower values to host lower current USB ports, thereby saving precious battery power, or support any application that requires a current-limited 5 V supply. The boost converter section of the AAT1275 provides efficiency levels of greater than 90% across a wide load range. A high 2 MHz switching frequency provides fast load transients and minimises the size of external components.

One of the most difficult challenges designers face using conventional boost converters is leakage current. To address this, the AAT1275 adds an innovative 'true load disconnect' feature that minimises losses and simplifies design by isolating the load from the power source when the device is off. Its integrated programmable current limiting load switch provides USB port protection too. An active low fault flag alerts the system to an over-current condition. It also has over-temperature and over-current protection and inrush current limit capability.

For more information contact Hi-Q Electronics, +27 (0)11 894 8083.

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