LTC1729CS8-4.1#PBF

Series:	--
Packaging:	Tube
Part Status:	Active
Battery Chemistry:	Lithium-Ion
Number of Cells:	1
Current - Charging:	--
Programmable Features:	--
Fault Protection:	--
Charge Current - Max:	--
Battery Pack Voltage:	4.1V
Voltage - Supply (Max):	28V
Interface:	--
Operating Temperature:	0°C ~ 70°C (TA)
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	LTC1729

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Introduction

The LTC1729CS8-4.1 PBF is a highly integrated power management integrated circuit (PMIC) for battery charging applications. It is designed to enable fast and reliable charging of various battery types and configurations, including single and multi-cell Li-Ion and Li-Polymer batteries. The device integrates linear and switching chargers, DC/DC converters, system voltage boost, and power path management, with NTC-temperature monitoring and over-voltage protections, in a single integrated and space-saving BGA package.

Application fields of LTC1729CS8-4.1 PBF

The LTC1729CS8-4.1 PBF is ideal for charging portable devices that rely on rechargeable Li-Ion and Li-Polymer batteries. Its primary application fields are in mobile telecommunication devices, mobile devices, such as tablets and ultra-portable PCs, hand-held computers, automotive devices, aircraft navigation systems, drones, satellites, portable medical systems and high-end consumer electronics. Additionally, the LTC1729CS8-4.1 PBF is suitable for any battery charging applications requiring high integration, wide input and output voltage ranges, and excellent power management.

Working principle of LTC1729CS8-4.1 PBF

The LTC1729CS8-4.1 PBF is designed with a single-channel sepic (single-ended primary-inductor-converter) charger and three dc/dc converters, as well as a PWM (pulse-width-modulation) boost converter. The device accepts either 4.5V to 20V input, making it suitable for a wide range of applications.The integrated powerpath design provides a seamless transition from wall adapter current to battery current allowing the battery to charge without draining the device, even during heavy load conditions. The sepic charger provides up to 0.8A to charge single Li-Ion or Li-Polymer cells, with an adjustable charging current from 200mA up to 0.8A. Additionally, the device includes battery pre-conditioning, charge termination, and bad-cell detection to ensure battery safety.The LTC1729CS8-4.1 PBF also includes three dc/dc converters, including a 2-output buck converter, a 4-output buck converter and a boost converter, to accommodates different power supply configurations and maximize system efficiency. The two buck converters provide up to 8A output current, while the boost converter provides up to 2.8A. Moreover, the LTC1729CS8-4.1 PFB also offers built-in over-temperature, power-good, feedback voltage, and over-voltage protections, to ensure system reliability. Additionally, the device includes a NTC monitoring for improved temperature accuracy, thus ensuring a safe operation of the charging system.

Conclusion

The LTC1729CS8-4.1 PBF is an ideal PMIC for battery charging applications. It features a highly integrated design, with wide input and output voltage ranges and excellent power management capabilities. Additionally, the device provides protections against over-temperature, over-voltage, and power-good conditions, as well as NTC temperature monitoring for improved accuracy. The LTC1729CS8-4.1 PBF is suitable for applications in mobile telecommunication devices, automotive, aircraft navigation systems, drones, satellites, medical systems, and high-end consumer electronics.

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