LTC3807EFE#PBF

Frequency - Switching:	50kHz ~ 900kHz
Base Part Number:	LTC3807
Supplier Device Package:	20-TSSOP-EP
Package / Case:	20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 38 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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LTC3807EFE#PBF Application Field and Working Principle

PMIC (Power Management Integrated Circuit) - Voltage Regulators - DC DC Switching Controllers - LTC3807EFE#PBF is a linear technology company’s low-cost high-performance IC control device that provides an efficient and reliable solution for a variety of types of power regulation. It can finish both current-mode and voltage-mode control, supports high current output and high switching frequency, and provides built-in protection functions that can satisfy the requirements of many applications.

Introduction to LTC3807EFE#PBF

The LTC3807EFE#PBF is a high-efficiency PWM (pulse-width modulation) switching regulator control IC, providing a neat output voltage regulation and precise current control loop. This IC combines versatile input voltage, output voltage (Vout) and current limit precision, making it a great choice for a wide variety of switching power supply applications, such as industrial systems, servers, DSPs, microcontrollers, FPGAs and other applications. It features the following features: • Low component count • Fast transient response • High efficiency • Constant switching frequency • Built-in protections • Wide input voltage range from 4.5V up to 28.0V • Output voltage 0.6V to Vin • Low standby current • 200kHz switching frequencyThe LTC3807EFE#PBF is offered in two packages: a PBF (plastic ball grid array) package for high reliability and long-term storage, and an LFE (lead-free and halogen-free) package for automotive applications.

Application Fields of LTC3807EFE#PBF

The LTC3807EFE#PBF has been widely adopted by a variety of application fields, namely industrial, automotive and server systems, to produce reliable power supply. Because this high-efficiency IC gives precise output voltage and current control, and utilizes pulse-width modulation with a constant switching frequency, it offers a favorably solution to satisfy the needs of high-performance, high-frequency power supplies, with fast transient response and low component count. The industrial fields using the LTC3807EFE#PBF are varied, including power inputs, Ethernet power protection, current source, optical transceiver, and point of load (POL) converters. The industrial usage of this IC delivers in scalability, high efficiency and low standby current, allowing for the device being used for many different applications. In automotive applications, LTC3807EFE#PBF is implemented in a variety of areas, such as brake system, airbag system, lighting systems, entertainment systems and electric driving systems. In the entertainment system, this device can be used in audio amplifiers, low-end amplifiers, and low-end bass amplifiers, to provide a clean and smooth power within the car, providing a distraction-free driving period. In the server system, this IC is used widely in many applications, like critical computing applications, such as server motherboards, rack-mounted server platforms, and embedded systems. These applications demand for a reliable, high-performance power supply, so that the power supply can be steady and not disturb the stability of the system, the LTC3807EFE#PBF serves this demand perfectly.

Operational Principle of LTC3807EFE#PBF

The LTC3807EFE#PBF uses PWM switching control to regulate the output voltage and current. The working principle of the device is as follows: When the input voltage (Vin) falls below the undervoltage lock out (UVLO) level and the output voltage (Vout) reaches the desired output voltage, the internal NPN power MOSFET conducts the charge. When the input voltage rises again, the internal Comparator will generate a signal, turning the NPN power MOSFET off and causing the output voltage (Vout) to stop charging. This process will repeat to form a closed loop, in order to maintain the output voltage (Vout) and current at the desired level.Additionally, the LTC3807EFE#PBF has a wide input voltage range from 4.5V up to 28V, a 200kHz operating frequency, and is capable of delivering 15A continuous current at a peak output of 20A. It also features a duty cycle range of 0.45 to 0.7V, with a current limit range of 0.25 to 15A. The built-in protection function of the device includes an overvoltage protection, an overcurrent/short circuit protection, and a thermal shutdown protection.

Conclusion

The LTC3807EFE#PBF is a highly efficient, low-cost and high-performance IC that can be used in a wide range of applications, including industrial, automotive and server systems. Its main feature is PWM (pulse-width modulation) switching control, which provides an effective and reliable solution for output voltage and current regulation. Furthermore, it includes several built-in protection functions, such as overvoltage protection, overcurrent/short circuit protection and a thermal shutdown protection, which ensures the stability and efficiency of the power regulation.

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