Voltage - Output (Min/Fixed):	1.7V
Base Part Number:	LT1949
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	600kHz
Current - Output:	1A (Switch)
Voltage - Output (Max):	28V
Series:	--
Voltage - Input (Max):	12V
Voltage - Input (Min):	1.7V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost, SEPIC
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LT1949IS8#TRPBF Application Field and Working Principle

Introduction to LT1949IS8#TRPBF

The LT1949IS8#TRPBF is a high performance, low power, monolithic Step-Down DC/DC Controller with integrated 2A, 60V switch designed for use in low voltage systems. This device design is based on a current mode architecture and utilizes two synchronous N-channel MOSFETs to deliver up to 90% efficiency over a wide range of output voltages. The LT1949IS8#TRPBF is capable of providing up to 500mA of continuous output current and is ideal for powering low voltage digital loads including FPGAs and DSPs.

Application Field of LT1949IS8#TRPBF

The LT1949IS8#TRPBF is an ideal choice for a variety of low voltage applications, including powering FPGAs and DSPs. The device delivers high performance and low-power solutions while maintaining high efficiency. Additionally, the device features an integrated over-voltage protection (OVP) to protect against over-current faults, as well as an integrated soft start to ensure smooth start-up and provide circuit protection during cold start conditions.The LT1949IS8#TRPBF is also ideal for applications that require a low-noise ripple due to its synchronous rectified oscillator. The device allows for two-step output regulation, with dynamic load regulation and fast transient response, and is capable of a wide input voltage range from 4.5V to 60V.

Working Principle of LT1949IS8#TRPBF

The working principle of the LT1949IS8#TRPBF is based on a current mode architecture. This enables the device to provide a wide range of output voltage levels. The device utilizes a two-stage regulation architecture, with dynamic load regulation and fast transient response.The LT1949IS8#TRPBF utilizes an oscillator, which is synchronized with the voltage of the input voltage feed. This enables the device to operate with greater efficiency, while maintaining a low ripple at the output. Furthermore, the synchronization feature allows for faster transient response, making it ideal for applications that require loads that change quickly.The device also employs a peak current feed-forward control loop, which allows for greater accuracy in regulating the output current and the overall power delivery. This is accomplished by monitoring the current waveform at the inductor, and adjusting the duty cycle in order to quickly respond to large load transients.In addition to these features, the LT1949IS8#TRPBF also features a wide input voltage range, over-voltage protection, and an integrated soft start. The integrated soft start ensures smooth start-up and provides circuit protection during cold start conditions.

Conclusion

The LT1949IS8#TRPBF is a high performance, low power, monolithic step-down DC/DC controller ideal for powering low voltage digital loads. The device utilizes a current mode architecture with two synchronous N-channel MOSFETs and is capable of providing up to 500mA of continuous output current. Additionally, the device also features an oscillator synchronization, peak current feed-forward control loop, over-voltage protection, and an integrated soft start. The LT1949IS8#TRPBF is suitable for a variety of low voltage applications, including powering FPGAs and DSPs.

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