LTC3621EDCB-5#TRPBF

Voltage - Output (Min/Fixed):	5V
Base Part Number:	LTC3621
Supplier Device Package:	6-DFN (2x3)
Package / Case:	6-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	1MHz
Current - Output:	1A
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	17V
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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1 Introduction of LTC3621EDCB-5#TRPBF

LTC3621EDCB-5#TRPBF is a high efficiency, dc-to-dc synchronous step-down switching regulator with low quiescent current, low on-resistance, and high frequency current mode operation. Combining a high efficiency internal power MOSFET switch, with a 200mV typical reference voltage and current mode modulation, the LTC3621EDCB-5#TRPBF is capable of efficiently supplying up to 3A adjustable and 0.6A fixed output currents. The device operates at a fixed frequency of 1.2MHz and provides multiple feature such as over current protection, current mode control and thermal shutdown protection.

2 Application Fields of LTC3621EDCB-5#TRPBF

The LTC3621EDCB-5#TRPBF is specifically designed as a high efficiency, synchronous step-down switching regulator, providing low component count, small size and high performance. Its low on-resistance, low quiescent current, and limited output ripple make it ideal for a variety of applications, such as:1. Battery-powered mobile devices: Laptops, handheld terminals, cell phones, tablet PCs, portable medical devices, and other battery-powered energy sensitive systems2. Motor controller: Automotive, industrial and consumer motor control applications 3. Automotive electronics: Driver/braking systems, lighting and display driver/systems4. Lighting systems: LED illumination and conversion of high voltage supplies to mid/low voltage supplies 5. Power tools and other industrial applications requiring efficient power conversion

3 Working Principle of LTC3621EDCB-5#TRPBF

The LTC3621EDCB-5#TRPBF is a synchronous step-down converter employing an internal 180mΩ N-channel MOSFET switch. This series of switching regulator relies on two main parts, the Error Amplifier and the PWM Controller, to operate normally and meet design objectives. The Error Amplifier, a type of comparator, monitors the voltage set point by comparing a reference voltage to the actual output voltage and informs the PWM Controller when a difference is detected. The PWM controller then adjusts the duty cycle of the waveform in order to maintain the output voltage as close as possible to the set point. The output voltage is directly proportional to the pulse-width modulation (PWM) and will eventually stabilize due to features such as soft-start and the current-limit circuit. The PWM waveform acts like a light switch, turning the internal MOSFET on and off rapidly in order to “chop” the larger input voltage into smaller, regulated increments. A synchronous rectifier rectifies this chopped waveform back into direct current to become the output voltage set by the Error Amplifier. Additional features such as thermal overload protection, over current protection and short-circuit protection are also included to prevent damage from occurring due to unexpected external conditions.

Conclusion

In conclusion, the LTC3621EDCB-5#TRPBF is a DC-to-DC switching regulator featuring low quiescent current, low on-resistance, current mode control, and a fixed frequency of 1.2MHz. It is ideal for a wide range of power conversion applications including battery-powered mobile devices, motor controls, automotive electronics, lighting systems, and power tools. Its efficient power conversion and high efficiency internal power MOSFET switch make it an ideal solution for a variety of applications.

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