LTC3255IDD#PBF

Voltage - Output (Min/Fixed):	2.4V
Base Part Number:	LTC3255
Supplier Device Package:	10-DFN (3x3)
Package / Case:	10-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	500kHz
Current - Output:	50mA
Voltage - Output (Max):	12.5V
Series:	--
Voltage - Input (Max):	48V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Charge Pump
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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LTC3255IDD#PBF Application Field and Working Principle

Introduction

The LTC3255IDD#PBF is a high performance, low quiescent current monolithic dual synchronous buck converter designed to operate with low input voltage to generate intermediate system supply for microprocessors and other digital ICs. This product is classified as a PMIC (Power Management IC) voltage regulator and falls within the specific category of DC-DC switching regulators.

Features and Benefits

This product has many benefits, including its high output current of up to 5A, which can efficiently support demanding loads. Additionally, its low quiescent current of 30μA reduces power consumption and energy costs.The wide input voltage range (from 4.5V to 20V) allows for flexibility when being used in multiple power sources, while its adjustable output voltage (from 0.6V - VIN) ensures the desired power supply required. It also has a variety of safety features such as an under-voltage lockout, over-voltage protection and thermal shutdown. It is equipped with an open-drain VOUT power-good flag to indicate an active load switch.

Applications

The LTC3255IDD#PBF has a variety of applications. It is well-suited for use in a wide range of embedded systems, such as mobile and consumer electronics. It is also used in a range of automotive, industrial, and home automation products.

Working Principle

This product operates on the principle of Dual Synchronous Buck converter that utilizes several key components such as an inductor, MOSFET switches, rectifiers, and capacitors to regulate power. The dual synchronous Buck converter is an efficient configuration for high power supplies, as it regulates the power into two modern loads with an output voltage that does not require an additional compensation network.The main parts and components in the LTC3255IDD#PBF include an N-channel power MOSFET, P-channel power MOSFET, current sense resistor, inductor and capacitor. The circuit starts by applying an input voltage to the N-channel MOSFET switch, typically at least 4.5V. This allows the output through the drain of the switch to pass through the inductor, providing a steady output voltage. The output voltage is then regulated by Pulse Width Modulation (PWM) or Burst Mode Control (BM) and is directly compared to the feedback voltage of sense resistor R1. As the MOSFETs switch at a constant frequency, the inductor flows with respect to the P-channel MOSFET and provides current to the output capacitor. The current then passes through the sense resistor to power the load. When the load is higher, the operating cycle time of the MOSFETs is shortened, thus providing the necessary higher current to the load.The LTC3255IDD#PBF is equipped with additional features and benefits, such as adjustable soft-start, adjustable current limit, and gate drive inputs to enable the use of external PWM controllers. This product is also advanced in that it is EMI optimized with zero external components, and fast loop response of up to 1µsec.

Conclusion

The LTC3255IDD#PBF is a high performance, low quiescent current Dual Synchronous Buck Converter designed to operate with low input voltage. It is categorized as a PMIC (Power Management IC) voltage regulator and falls within the specific category of DC-DC switching regulators. It offers adjustable output voltage and is widely applicable in a range of operations. The main components within the product includes an N-channel and P-channel MOSFET, current sense resistor and an inductor & capacitor. This product also has additional features and benefits such as adjustable soft-start, adjustable current limit, and a gate drive inputs.In conclusion, the LTC3255IDD#PBF is a high performance DC-DC switching regulator that is suitable for a range of operations, as it has a wide input voltage range, adjustable output voltage and a number of additional features and benefits.

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