1.5A, 1.5MHz Synchronous Boost Regulator with Automatic Fault Detection for USB On-The-Go Applications

(PresseBox) ( Milpitas, CA, )
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 × 3mm DFN Package

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.
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