Features

• Compact Solution for 5V USB On-The-Go V_BUS Power
• 5V at 500mA from Single Li-Ion Cell
• Automatic Fault Detection
• High Efficiency: Up to 95%
• V_IN Range: 1.8V to 5.25V
• Fixed 5V Output
• Short Circuit Protection
• 1.5MHz Low Noise, Fixed Frequency PWM
• Inrush Current Limiting and Internal Soft-Start
• Output Disconnect
• <1μA Quiescent Current in Shutdown
• V_IN > V_OUT Operation
• 8-Lead, 2mm × 3mm DFN Package

Typical Application

Description

The LTC3529 is a 5V output, synchronous, fixed frequency step-up DC/DC converter optimized for USB On-The-Go (OTG) hosting applications. This compact USB OTG 5V V_BUS converter features a 1.5MHz switching frequency, internal compensation and a tiny 2mm × 3mm DFN package. The LTC3529 can operate from input voltages as low as 1.8V.

 USB OTG-specific features include a fault fl ag with 22ms deglitching to indicate when the bus is overloaded, output disconnect and short circuit protection. Following a fault, the LTC3529 can be programmed to either latch-off or restart after a time-out duration.

Additional features include a <1μA shutdown mode, soft-start, inrush current limiting and thermal overload protection. Anti-ring circuitry reduces EMI during low power operation. The LTC3529 is offered in an 8-Lead 2mm × 3mm × 0.75mm DFN package.