Allicdata Part #: | LT3667IUDD-ND |
Manufacturer Part#: |
LT3667IUDD |
Price: | $ 0.00 |
Product Category: | Integrated Circuits (ICs) |
Manufacturer: | Linear Technology/Analog Devices |
Short Description: | IC REGULATOR |
More Detail: | Linear And Switching Voltage Regulator IC 3 Output... |
DataSheet: | LT3667IUDD Datasheet/PDF |
Quantity: | 1000 |
1 +: | 0.00000 |
Voltage/Current - Output 3: | 0.8 V ~ 38.6 V, 200mA |
Supplier Device Package: | 24-QFN (3x5) |
Package / Case: | 24-WFQFN Exposed Pad |
Mounting Type: | Surface Mount |
Operating Temperature: | -40°C ~ 125°C |
Voltage - Supply: | 1.6 V ~ 45 V |
w/Sequencer: | No |
w/Supervisor: | No |
w/LED Driver: | No |
Series: | -- |
Voltage/Current - Output 2: | 0.8 V ~ 38.6 V, 200mA |
Voltage/Current - Output 1: | 1.2 V ~ 38.6 V, 400mA |
Frequency - Switching: | 243kHz ~ 2.2MHz |
Number of Outputs: | 3 |
Function: | Any Function |
Topology: | Step-Down (Buck) (1), Linear (LDO) (2) |
Part Status: | Obsolete |
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Introduction
Linear and switching regulator (LM3667IUDD) is a high-performance low-voltage, low power voltage regulators designed for automotive and other systems. It is suitable for providing a broad range of voltage levels and can be used for accurate-level shifting, up-regulation/down-regulation or boosting across most applications. The regulator has forced output current limiting, fixed-frequency pulse width modulation (PWM) or pulse freq (PFM), soft-start, and a low noise output, enabling it to be used in numerous applications.
Application areas of LM3667IUDD
The LM3667IUDD is capable of providing a regulated output voltage as low as 0.6 V and as high as 8 V. It is suitable for providing an efficient solution in applications such as power systems, part of an LED backlighting systems, battery charging, storage modules, motor drivers, HVAC systems and can be used as part of regulators that power an FPGA, ASIC or micro-controllers.
Basic Operation
The output voltage of LM3667IUDD is regulated by monitoring the feedback voltage and adjusting the internal PWM or PFM duty cycle to maintain the output voltage; the system ensures reliability, accuracy and stability across all current and temperature ranges . In addition, the regulator can be configured to take either a voltage input or a current input. In the case of voltage input, an enable/shutdown feature is available and, if enabled, the regulator can be switched ON/OFF in both PWM and PFM modes. An internal soft start, which is independent of the switching frequency and current limit, can also be programmed to reduce inrush current at start up.
Features
- Voltage input range from 0.6 V to 8 V
- High current limit options up to 3A
- Switchable PFM and PWM control with selectable preset frequencies
- Integrated soft start provides fast, spike-free start up
- Current mode control for higher loop bandwidth Applications
- Adjustable output voltage and current limits
- Thermal shutdown
- Low-noise output even at low load current
Block Diagram of LM3667IUDD
Figure 1 shows a block diagram of the LM3667IUDD. The IC consists of two main sections: the logic section and the power supply section. The logic section is responsible for setting up the power supply and regulating the output voltage. It is comprised of a digital comparator and a voltage reference. The power supply section consists of an operating amplifier, output devices and an inductor. The output devices are used to regulate the output voltage. The operating amplifier is used to detect the output voltage and compare it to the reference voltage. The inductor is used to store energy and filter the output.
Working Principle
The LM3667IUDD operates as a switching regulator, where the output voltage is regulated by controlling the switching frequency using pulse width modulation (PWM) or pulse freq (PFM). In PWM mode, the pulse width is adjusted to maintain the output voltage within the set limit. In PFM mode, the frequency is adjusted to maintain the output voltage within the set limit. The regulator enables the user to have precise control over the output voltage and current, and can be configured to provide a steady output or adjustable one.
The LM3667IUDD also incorporates a current-limit feature which allows the user to protect against overloads. The current limit is adjustable and can be set to either a single value or ramped to reduce the inrush current at the start up. The regulator also includes a thermal shutdown feature which helps protect the IC from overheating.
Conclusion
The LM3667IUDD is a high-performance low-voltage, low power voltage regulator designed for automotive and other systems. It is suitable for providing a broad range of voltage levels and can be used for accurate-level shifting, up-regulation/down-regulation or boosting across most applications. The regulator has forced output current limiting, fixed-frequency pulse width modulation (PWM) or pulse freq (PFM), soft-start, and a low noise output. It is suitable for providing an efficient solution in applications such as power systems, part of an LED backlighting systems, battery charging, storage modules, motor drivers, HVAC systems and can be used as part of regulators that power an FPGA, ASIC or micro-controllers.
The specific data is subject to PDF, and the above content is for reference
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