Synchronous Boost Regulator suits USB OTG applications.
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Press Release Summary:
Supplied in 2 x 3 mm DFN package, LTC3529 current mode DC/DC converter offers automatic overload fault detection and USB On-The-Go (OTG)-specific protection circuit with programmable fault flag. Internal 1.5 A switches deliver up to 500 mA output current to fixed 5 V output from single-cell Li-Ion battery, and synchronous rectification enables efficiencies of up to 95%. Operating from 1.8-5.25 V input, solution has constant switching frequency of 1.5 MHz and output disconnect feature.
Original Press Release:
1.5A, 1.5MHz Synchronous Boost Regulator with Automatic Fault Detection for USB On-The-Go Applications
MILPITAS, CA - March 11, 2009 - Linear Technology Corporation announces the LTC3529, a 1.5MHz, current mode synchronous boost DC/DC converter with automatic overload fault detection. The device's USB OTG - specific protection circuit includes a fault flag that can be programmed to either latchoff or restart after a timeout duration when the bus is overloaded. The LTC3529's internal 1.5A switches can deliver up to 500mA of output current to a fixed 5V output from a single-cell Li-Ion battery. An input voltage range of 1.8V to 5.25V makes the LTC3529 ideal for Li-Ion/Polymer or multicell alkaline/NiCd/NiMH applications. Synchronous rectification enables efficiencies of up to 95%, providing extended battery run-time in handheld applications. The combination of a 2mm x 3mm DFN-8 package and a constant switching frequency of 1.5MHz minimize both inductor and capacitor sizes, providing a tiny solution footprint required in handheld applications.
The LTC3529 uses internal switches with an RDS(ON) of only 90mOhm (N-channel) and 120mOhm (P-channel) to deliver efficiencies as high as 95%. The output disconnect feature allows the output to be completely disconnected in shutdown and also limits the inrush of current during start-up, minimizing surge currents seen by the input supply. The LTC3529 will also regulate the output when the input voltage exceeds the output voltage. Additional features include anti-ringing control, short-circuit protection, soft-start and thermal protection.
LTC3529EDCB is available from stock in an 8-lead DFN package. 1,000-piece pricing starts at $2.05 each. For more information, visit www.linear.com.
Summary of Features: LTC3529
Compact Solution for 5V USB On-The-Go VBUS Power
5V at 500mA from Single Li-Ion Cell
Automatic Fault Detection
High Efficiency: Up to 95%
VIN Range: 1.8V to 5.25V
Fixed 5V Output
Short Circuit Protection
1.5MHz Low Noise, Fixed Frequency PWM
Inrush Current Limiting & Internal Soft-Start
Output Disconnect
< 1uA Quiescent Current in Shutdown
VIN > VOUT Operation
8-Lead, 2mm x 3mm DFN Package
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule(TM) products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
LT, LTC and LTM are registered trademarks and µModule is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.
Contacts
North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
