LT3651IUHE-4.2

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

The LT3651IUHE-4.2 is a device with multiple application fields and a unique working principle, which puts it in the Power Management IC and Battery Charger category.

This device is a 7mm × 8mm WQFN package, low-voltage synchronous buck battery charging solution which operates over a very wide input voltage range of 4.3V to 28V. When using the most compatible inductor, an input current of up to 4.2A can be achieved.

It has an adjustable float voltage down to 0.8V from 4.2V, which ensures a wide range of end-of-charge voltage. It can also operate in either fast-charge, pre-charge, and trickle-charge modes. Additionally, it has a dedicated input current-limit-control pin and an I2C controlled current-monitoring ADC input.

The main application area of this device is automotive battery management. It can be used for Electric Vehicle Battery Management, Cells Balancing, and Intelligent Battery Packs. It also supports other fields such as Consumer and Industrial Portable Applications, Uninterruptible Power Supply and Docking Stations, Automated Test Equipment and Alternative Energy Management.

The LT3651IUHE-4.2 operate after a four-step consecutive charge cycle: preconditioning, constant current, constant voltage and float. The preconditioning stage is used to raise the cell voltage close to the final charge voltage. Then, a constant current is applied to the cell until the maximum cell voltage is reached. At the third stage, constant voltage (CV) is applied until battery voltage and current both reach the set limit. Finally, in the fourth and last stage, a floating current (float) takes place. This stage is used to maintain a fully charged battery.

The LT3651IUHE-4.2 is based on current shunt regulation and has very accurate circuit-current throttling. It works like a voltage regulator, where the output voltage is nearly fixed and the current into the load is independent of the voltage. This makes the current more accurate and proportional to the commands sent by I2C and Pulse Skipping Modulation. This current shunt regulation is based on an Internal Current Sense Amplifier (ISA) that measures the inductor current and the current to the load, which is then compared to a reference. The ISA will then adjust the duty cycle of the regulator to keep the current from the inductor match to reference. In addition to current shunt regulation, the LT3651IUHE-4.2 also uses Current Limiting and Over Voltage Protection to maximize system reliability.

When an overly large load current is drawn, the current-sense voltage can reach the over-current threshold. In this case, the LT3651IUHE-4.2 will either switch to pulse frequency modulation (PFM) mode or shut down if both the current limit and current sense voltage exceed the limits. Similarly, if the system voltage exceeds the over-voltage protection (OVP) limits, the device will shut itself off to protect the system.

The LT3651IUHE-4.2 is a PMIC and battery charger with a wide range of applications in the automotive, consumer and industrial sectors. Its four-step charging cycle enables precise control over the charging parameters and accurate current monitoring, while the current shunt regulation ensures stability and reliability. Over-current and over-voltage protection ensure the safety of the device in case of any excess current or voltage.

The specific data is subject to PDF, and the above content is for reference