Voltage - Output (Min/Fixed):	1.5V
Base Part Number:	LTC3633
Supplier Device Package:	28-TSSOP-EP
Package / Case:	28-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	500kHz ~ 4MHz
Current - Output:	3A
Voltage - Output (Max):	12V
Series:	--
Voltage - Input (Max):	20V
Voltage - Input (Min):	3.6V
Number of Outputs:	2
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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Application Field and Working Principle of LTC3633AEFE-3#PBF

Introduction

Linear Technology Corporation is one of the leading providers of high-performance analog and mixed-signal products. This datasheet is for the LTC3633AEFE-3#PBF, a state-of-the-art synchronous buck DC-DC switching regulator from Linear. It is part of the DC-DC Voltage Regulator Series from Linear. The LTC3633AEFE-3#PBF features an excellent tolerance to load and line transients, fast transient response, and high power density.

What is the LTC3633AEFE-3#PBF?

The LTC3633AEFE-3#PBF is a synchronous buck regulator configurable as either a step-down or step-up DC-DC switching regulator. It converts any input voltage up to 20V down to as low as 0.6V with up to 5A of output current. The DC-DC converter is equipped with two high-side PMOS and one low-side NMOS switches, resulting in an adjustable power rating up to 10W with an efficiency of up to 95%. This voltage regulator supports a seamless transition between step-down and step-up operation, which makes it ideal for applications where the input and output voltage levels need to be managed.

How does the LTC3633AEFE-3#PBF work?

The LTC3633AEFE-3#PBF works by using a synchronous buck topology. In this topology, the high-side switch is connected to the input voltage with a P-channel FET, and the low-side switch is connected to the output voltage with an N-channel FET. When the regulator is in the step-down mode, the P-channel FET is on and the N-channel FET is off. This creates a path for current to flow from the input voltage to the output voltage. The voltage across the P-channel FET is determined by the voltage divider made up of two resistors connected to the P-channel FET gate. As the output voltage changes, the P-channel FET voltage changes, allowing the regulator to adjust its output voltage to maintain the desired output.

What are the applications of the LTC3633AEFE-3#PBF?

The LTC3633AEFE-3#PBF is most commonly used in automotive, medical and industrial applications where an adjustable high-efficiency power supply is required. It is ideal for powering microprocessors, FPGAs, motor controllers, and all types of digital circuits. Additionally, its high switching frequency allows for simple and small external components, making it easy to design and implement these high-performance power solutions. The LTC3633AEFE-3#PBF is an ideal choice for applications requiring an adjustable and efficient power supply.

Conclusion

The LTC3633AEFE-3#PBF from Linear Technology Corporation is a DC-DC switching voltage regulator with synchronous buck topology. It is configurable as either a step-down or step-up regulator, and is ideal for powering microprocessors, FPGAs, motor controllers and digital circuits in automotive, medical and industrial applications. The regulator is equipped with two high-side PMOS and one low-side NMOS switches and offers a high power density with excellent tolerance to load and line transients, fast transient response and high efficiency. The LTC3633AEFE-3#PBF is the ideal choice for applications requiring an adjustable and efficient power supply.

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