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.
Further reading:
Power efficiency and robustness in electronics design
Power Electronics / Power Management
Mouser Electronics recently announced a new eBook in collaboration with Analog Devices highlighting essential strategies for optimising power systems.
Read more...
USB Type-C-powered controllers
Future Electronics
Power Electronics / Power Management
Diodes Incorporated has released two USB Type-C PD 3.1 extended power range sink controllers that can be embedded into battery-powered devices.
Read more...
Multicell battery monitoring
Altron Arrow
Power Electronics / Power Management
The LTC6811 from Analog Devices is a multicell battery stack monitor that measures up to 12 series connected battery cells with a total measurement error of less than 1,2 mV.
Read more...
Full telemetry in tiny DC-DC converters
RS South Africa
Power Electronics / Power Management
The FS160* series of µPOL DC-DC converters from TDK all offer full telemetry, provide increased performance, and are remarkable for extraordinary power density in the smallest sizes.
Read more...
Power IC supplies 1650 W
EBV Electrolink
Power Electronics / Power Management
Power Integrations has announced a two-fold increase in power output from the HiperLCS-2 chipset with the new device now being able to deliver up to 1650 W of continuous output power.
Read more...
High-voltage step-down DC-DC converter
Altron Arrow
Power Electronics / Power Management
The MAX17793 is a high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operating over an input voltage range of 3 to 80 V.
Read more...
High-voltage contactors
RS South Africa
Power Electronics / Power Management
TDK Corporation has announced two new additions to its high-voltage contactor portfolio for harsh environments: the HVC43MC with integrated mirror contact and the HVC45 with enhanced short-circuit current handling capability.
Read more...
Chokes rated at 36 A
RS South Africa
Power Electronics / Power Management
TDK Corporation has launched the EPCOS SurfIND series, a new range of current-compensated ring core double chokes for high currents and surface mounting.
Read more...
RF arrestor provides robust protection
RFiber Solutions
Power Electronics / Power Management
NexTek’s range of coaxial RF surge and lightning arrestors are designed and built to provide robust protection for any radio or coaxial RF transmission application.
Read more...
Wide-Bandgap Developer Forum 2025
Power Electronics / Power Management
To give designers the ultimate in design flexibility, the entire range of WBG power semiconductors will be provided including discretes, modules, and highly integrated solutions ranging from 40 V to 700 V for GaN and 400 V to 3,3 kV for SiC.
Read more...
printer friendly version