LT3465ES6#TRPBF

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LT3465ES6#TRPBF Application Field and Working Principle

The LT3465ES6#TRPBF is an integrated, high efficiency, low voltage step-down constant current LED driver. It is one of Analog Devices’ PMIC (Power Management IC) series products that works by stepping down input voltage to a constant output current. This device is designed for portable applications such as handheld electronics, mobile phones and personal digital assistants.

Key Features

• Input Voltage Range: 2.7V to 11V
• Output Current Range: 10mA to 100mA
• Operating Temperature Range: -40°C to +85°C
• High Efficiency Up to 96%
• Programmable Soft-Start
• Programmable Dead Time
• Open LED Detection
• Maximum Output Voltage Clamping
• Shutdown Mode
• No External Inductors Required
• Integrated 25mΩ Internal Power MOSFET

Block Diagram

The LT3465ES6#TRPBF is an integrated PMIC featuring an internal 25mΩ Power MOSFET switch and refence circuit in its block diagram. It consists of two sections, the power stage and the control stage. The power stage is comprised of the control MOSFET switch and the inductor. This section is used for step-down and current regulation. The control stage is responsible for providing a precise and stable output current during all operating conditions, and it includes two control loops, the high side current sense amplifier, the error amplifier and the voltage regulator.

Working Principle

The LT3465ES6#TRPBF works through a step-down process. When the supply voltage is higher than the output voltage, the power MOSFET switch is driven into conduction. During this process, the current through the inductor increases until it reaches the steady state. When the inductor current reaches the threshold, the switch turns off and conversion process begins. As the current through the inductor decays, the diode takes over and the voltage across the inductor decays from the output voltage until it reaches the reference voltage. During this process, the current through the inductor, the diode and the output current will remain constant, performing the required step-down conversion.

Applications

The LT3465ES6#TRPBF is an ideal device for powering LEDs in portable applications. It is widely used in consumer electronic products such as portable chargers, handheld electronic products, smartphones and tablets. It can also be used in automotive, medical and industrial lighting applications.

Conclusion

The LT3465ES6#TRPBF is an integrated, highly efficient, low voltage step-down constant current LED driver. It is designed to step down the input voltage to a constant output current. Key features include a wide input voltage range, a programmable soft-start, open LED detection, maximum output voltage clamping and integrated 25mΩ internal power MOSFET. This device is suitable for various applications such as consumer electronics, automotive, medical and industrial lighting.

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