Analog Devices LTC3127 Product Info

• Programmable (0.2A to 1A) ±4% Accurate Average Input Current Limit
• Regulated Output with Input Voltages Above, Below or Equal to the Output
• 1.8V to 5.5V (Input) and 1.8V to 5.25V (Output) Voltage Range
• 0.6A Continuous Output Current: V_IN > 1.8V
• 1A Continuous Output Current: V_IN > 3V
• Single Inductor
• Synchronous Rectification: Up to 96% Efficiency
• Burst Mode^® Operation: I_Q = 35μA (Pin Selectable)
• Output Disconnect in Shutdown
• <1μA Shutdown Current
• Small, Thermally Enhanced 10-Lead (3mm × 3mm × 0.75mm) DFN and 12-Lead MSOP Packages

The LTC3127 is a wide V_IN range, highly efficient, 1.35MHz fixed frequency buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The LTC3127 features programmable average input current limit, making it ideal for power-limited input sources. The input current limit is programmed with a single resistor and is accurate from 0.2A to 1A of average input current.

The topology incorporated provides a continuous transfer function through all operating modes. Other features include <1μA shutdown current, pin-selectable Burst Mode operation and thermal overload protection. The LTC3127 is housed in thermally enhanced 10-lead (3mm × 3mm × 0.75mm) DFN packages and 12-lead MSOP packages.

Applications

• USB Powered GSM Modems
• Supercap Charger
• Handheld Test Instruments
• PC Card Modems
• Wireless Terminals