
Allicdata Part #: | LT3971IDD-3.3#TRPBF-ND |
Manufacturer Part#: |
LT3971IDD-3.3#TRPBF |
Price: | $ 0.00 |
Product Category: | Integrated Circuits (ICs) |
Manufacturer: | Linear Technology/Analog Devices |
Short Description: | IC REG BUCK 3.3V 1.2A 10DFN |
More Detail: | Buck Switching Regulator IC Positive Fixed 3.3V 1 ... |
DataSheet: | ![]() |
Quantity: | 1000 |
Voltage - Output (Min/Fixed): | 3.3V |
Base Part Number: | LT3971 |
Supplier Device Package: | 10-DFN (3x3) |
Package / Case: | 10-WFDFN Exposed Pad |
Mounting Type: | Surface Mount |
Operating Temperature: | -40°C ~ 125°C (TJ) |
Synchronous Rectifier: | No |
Frequency - Switching: | 200kHz ~ 2MHz |
Current - Output: | 1.2A |
Voltage - Output (Max): | -- |
Series: | -- |
Voltage - Input (Max): | 38V |
Voltage - Input (Min): | 4.3V |
Number of Outputs: | 1 |
Output Type: | Fixed |
Topology: | Buck |
Output Configuration: | Positive |
Function: | Step-Down |
Part Status: | Active |
Packaging: | Tape & Reel (TR) |
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The LT3971IDD-3.3#TRPBF is a DC-DC converter that utilizes non-synchronous, phase-shifted, full bridge (PSFB) topology with an internal clock and synchronizable oscillator. The power converter has a typical input voltage range from 6V to 40V and an output voltage range from 0.8V to 5V. The converter is capable of operating either in a continuous (DCM) or discontinuous (CRM) mode for a wide range of input voltages and better efficiency. With an operating temperature range of -40°C to +125°C and a maximum junction temperature of +150°C, the LT3971IDD-3.3#TRPBF is suitable for applications in a wide range of conditions.
The LT3971IDD-3.3#TRPBF can regulate output current up to 3.3A and has very good load transient performance. It offers current limiting and thermal protection to prevent damage to the device. The LT3971IDD-3.3#TRPBF supports various control schemes, including pulse width modulation (PWM), pulse frequency modulation (PFM), and signal-regulated (SR) mode for optimal efficiency in a wide range of conditions. With 4:1 input voltage range capability, the regulator is capable of operating from low input voltages down to 6V. It also offers spread spectrum frequency modulation (SSFM) feature which enables operating the converter in a wide range of input voltages and line-frequency variations.
The LT3971IDD-3.3#TRPBF can be used in various applications including low-noise, high-density, telecommunications and industrial power systems, digital power systems, automotive and consumer electronics products. The device can also be used in applications where the input voltage exceeds the output voltage, such as powering a +5V voltage rail from a +12V or +24V input supply. The LT3971IDD-3.3#TRPBF has been designed to meet tight output voltage accuracy and line/load transient response requirements common in these types of applications.
Working Principle
The LT3971IDD-3.3#TRPBF is a synchronous full bridge PWM DC-DC converter. The device utilizes two N-MOSFETs and two P-MOSFETs in a push-pull configuration to convert the input voltage to the desired output voltage. The device operates in either continuous current mode (CCM) or discontinuous current mode (DCM) based on input voltage and load condition. The device can also be configured to operate with a reduced switching frequency (up to 840kHz) to reduce EMI emissions or to improve light-load efficiency.
The converter uses an internal clock and synchronizable oscillator to generate an oscillating enable signal with an adjustable on time. The enable signal then drives the gates of the MOSFETs to create either a positive or negative voltage feedback to the control loop. Depending on the output feedback, the converter switches at a frequency to regulate the output voltage.
The LT3971IDD-3.3#TRPBF can be programmed to use either a voltage-mode or a current-mode regulation topology. The voltage-mode topology senses the output voltage and regulates it by controlling the on-time of the pulse-width modulator (PWM) comparator. For the current-mode topology, the PWM comparator senses the voltage on an inductor current sense pin, thus controlling the on-time of the PWM comparator to regulate the inductor current.
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