Features and Benefits
- 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: VIN > 1.8V
- 1A Continuous Output Current: VIN > 3V
- Single Inductor
- Synchronous Rectification: Up to 96% Efficiency
- Burst Mode® Operation: IQ = 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 VIN 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.
- USB Powered GSM Modems
- Supercap Charger
- Handheld Test Instruments
- PC Card Modems
- Wireless Terminals
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Demonstration circuit 1451A is a Buck-Boost DC/DC converter featuring the LTC3127EDD and is ideally suited for pulsed load applications where the input current needs to be limited. Demonstration circuit 1451A is configured for 1.0A maximum input current limit and can handle pulsed load currents of up to 2A, with duty cycles of up to 15%. The input voltage range is 1.8V to 5.5V. The fixed input current limit can be adjusted by replacing one resistor (R6).
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
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Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.