Texas Instruments

LM3643AYFFR  

External/Internal LED Drivers

The LM3643AYFFR is a highly integrated step-up/step-down converter from Texas Instruments. It is designed to provide a flexible and efficient solution for converting input voltages to a regulated output voltage. Here is a brief description of the model, its features, and applications:

Description:

The LM3643AYFFR is a versatile and high-efficiency synchronous step-up/step-down converter that can operate in both boost (step-up) and buck-boost (step-down) modes. It is available in a compact 10-pin WSON package, making it suitable for space-constrained applications.

Features:

1. Input Voltage Range: The LM3643AYFFR can accept a wide input voltage range, typically from 2.5V to 5.5V, making it suitable for various power supply scenarios.
2. Output Voltage Range: The output voltage can be programmed using an external resistor divider, allowing for a wide range of output voltages to be achieved.
3. High Efficiency: The converter offers high efficiency, with typical efficiencies of up to 93% in boost mode and 89% in buck-boost mode.
4. Synchronous Rectification: The use of synchronous rectification in both the step-up and step-down modes helps to minimize power losses and improve efficiency.
5. Integrated Power MOSFETs: The device features integrated power MOSFETs, reducing the number of external components required and simplifying the design.
6. Soft Start: The converter includes a soft-start feature to minimize inrush current and reduce stress on the input power source.
7. Current Limit and Thermal Protection: The LM3643AYFFR includes over-current protection and thermal shutdown to protect against fault conditions and overheating.
8. Small Form Factor: The 10-pin WSON package allows for a compact solution, making it suitable for portable and space-constrained applications.

Applications:

1. Portable Electronics: Due to its high efficiency and small form factor, the LM3643AYFFR is well-suited for powering portable electronic devices such as smartphones, tablets, and wearables.
2. Battery Charging: The step-down capability makes it suitable for battery charging applications, where a regulated output voltage is required to charge batteries with different chemistries.
3. Power Banks: The converter can be used in power banks to efficiently step down the voltage from a higher input voltage to charge devices with lower voltage requirements.
4. Medical Devices: The LM3643AYFFR can be used in medical devices that require a regulated output voltage and have space constraints.
5. IoT Devices: Internet of Things (IoT) devices often require efficient power conversion, and the LM3643AYFFR can be used to provide a regulated output voltage in these applications.

Overall, the LM3643AYFFR is a highly versatile and efficient step-up/step-down converter that can be used in a wide range of applications requiring efficient power conversion and a compact form factor.

LM3643AYFFR Documents

Download datasheets and manufacturer documentation for LM3643AYFFR

PCN Assembly/Origin :

Mult Devices 29/Mar/2019      

Datasheets :

LM3643(A) Datasheet      

Design Resources :

Lighting Product Selector      

HTML Datasheet :

LM3643(A) Datasheet