LTC4009CUF-2#TRPBF

Battery Chargers Overview

The LTC4009CUF-2#TRPBF is a high-efficiency, multi-chemistry battery charger controller manufactured by Analog Devices Inc. It utilizes a synchronous quasi-constant frequency PWM control architecture to charge lithium-ion and lithium polymer batteries without generating audible noise with ceramic bulk capacitors. The device features pin-programmable output voltage for 4.2V/cell applications, supporting 1-, 2-, 3-, or 4-series cell packs. Key electrical parameters include an operating supply voltage range of 6 V to 28 V, an output voltage range of 2 V to 28 V, and an output current capability of 85 mA. It is housed in a QFN-20 package.

Battery Chargers Feature Summary

• Synchronous quasi-constant frequency PWM control architecture eliminates audible noise when used with ceramic bulk capacitors.
• Pin-programmable output voltage configuration specifically designed for 4.2V/cell lithium-ion and lithium polymer battery packs.
• Fully adjustable AC adapter input current limiting maximizes charge rate while maintaining a fixed input power level.
• External programming allows precise setting of charge current via sense, input, and programming resistors.

Battery Chargers Applications

• Charging 1-, 2-, 3-, or 4-series lithium-ion battery packs
• Charging 1-, 2-, 3-, or 4-series lithium polymer battery packs
• General-purpose battery charger controllers requiring silent operation

Battery Chargers Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging rather than tube packaging found in other variants like #PBF. Confirm the -2 suffix corresponds to the 4.2V/cell specification required for your battery chemistry. Ensure the QFN-20 thermal pad connection is properly managed during assembly. Cross-reference the exact part number against the manufacturer's latest datasheet to confirm availability status and any potential obsolescence notices.

Battery Chargers Selection Notes

Select this component when silent operation with ceramic capacitors is critical. Choose the -2 suffix variant specifically for 4.2V/cell battery chemistries. Consider the external resistor requirements for setting current limits and input current thresholds. Evaluate the 6 V to 28 V operating voltage range against your system's power source capabilities. Verify that the 85 mA output current meets the target battery charging requirements.

Battery Chargers Part Context

The LTC4009 belongs to a family of high-efficiency battery charger controllers from Analog Devices. While the base LTC4009 offers fully adjustable output voltage, the LTC4009-1 and LTC4009-2 variants provide pin-programmed options for standard lithium-ion configurations. The -1 version targets 4.1V/cell, whereas the -2 version targets 4.2V/cell. This family shares common features like synchronous buck topology and AC input current limiting.

Battery Chargers Replacement Considerations

The LTC4009CUF-1#TRPBF serves as a direct substitute if the application requires a 4.1V/cell float voltage instead of 4.2V/cell. Both share identical pinouts, packages, and functional architectures. Ensure the battery management system is compatible with the slightly different termination voltage before swapping.