LTC3859AMPFE#TRPBF

Frequency - Switching:	115kHz ~ 835kHz, 350kHz ~ 535kHz
Base Part Number:	LTC3859
Supplier Device Package:	38-TSSOP-EP
Package / Case:	38-TFSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-55°C ~ 150°C (TJ)
Control Features:	Enable, Frequency Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%, 100%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 38 V
Output Phases:	2
Number of Outputs:	3
Topology:	Buck, Buck-Boost, SEPIC
Output Configuration:	Positive
Function:	Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction to LTC3859AMPFE#TRPBF

The LTC3859AMPFE#TRPBF is a highly advanced voltage controller from Linear Technology. It combines cutting-edge power management capabilities and flexibility in a tiny 40-pin TSSOP package and is designed for applications in the Power Management, Industrial Control, and Automotive domains. Graphically, it looks like a black square chip with a white capital letter ‘L’ and a smaller black square. The voltage ranges of the LTC3859AMPFE#TRPBF device allows it to support both Primary Side Regulation (PSR) and Secondary Side Regulation (SSR) in power converter applications. It can support Vin input up to 10 V and output voltage up to 28 V.It has a wide range of voltage inputs, starting at 2.6 V, so it can be used with a variety of system components. It is also able to provide up to 10 A of output current, allowing it to support higher power loads.

Application fields of LTC3859AMPFE#TRPBF

The LTC3859AMPFE#TRPBF is a versatile voltage regulator with many applications, such as:

• Battery charging applications
• Power supply for DC to DC converters
• Switching converters in notebook computers and servers
• Load switch applications
• Reverse current protection systems
• Portable gaming devices, including laptops and netbooks
• Bluetooth enabled portable devices
• Automotive powertrain and charging systems

Working Principle of LTC3859AMPFE#TRPBF

The LTC3859AMPFE#TRPBF device is a DC/DC switching controller designed for high-performance, high-efficiency, and high-density power architectures. By regulating output voltages, the LTC3859AMPFE#TRPBF offers excellent load and line regulation, fast transient response and low output noise.The LTC3859AMPFE#TRPBF device consists of a dual mode control loop, which provides both Current Mode Control (CMC) and Voltage Mode Control (VMC) operation. It monitors and controls the external power device and thus regulates the output voltage. CMC supports high-performance, high-efficiency and high-density switching applications. In this mode of operation, the output voltage is sensed using the current waveform of the external power device and the switching frequency automatically adjusts to maintain the desired output voltage level.VMC provides fast transient response, low output noise and very low output voltage ripple. It is a more complex control loop and implements a voltage sense circuit with external compensation components. In this mode, the output voltage is sensed and compared directly with the reference voltage to determine the on and off times of the external power device.The LTC3859AMPFE#TRPBF device also contains several safety features such as an active power-down feature, an auto restart mode and an overvoltage protection circuit. The active power-down feature enables the user to initiate a safe shutdown of the power supply whenever there is an overvoltage or undervoltage condition detected. The auto restart mode makes the LTC3859AMPFE#TRPBF device totally recoverable after a fault. It can reset itself and start up quickly without requiring external assistance. The overvoltage protection (OVP) circuit prevents excessive current from entering the system when an overvoltage condition is detected.

Conclusion

The LTC3859AMPFE#TRPBF is an advanced, highly efficient and powerful DC to DC switching controller that can be used in a wide variety of applications. It combines a dual mode control loop, fast transient response, low output noise and several safety features, making it suitable for even the most challenging tasks. It is compatible with a wide range of input and output voltages and can provide up to 10 A of output current, making it a very viable choice for applications in the Automotive, Industrial Control and Power Management domains. Overall, the LTC3859AMPFE#TRPBF is a versatile and reliable DC to DC switching controller that can provide consistent, reliable performance and flexibility for applications in a variety of operating environments.

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