Overview
The LM22672MRX-5.0/NOPB is a 42-V, 1-A SIMPLE SWITCHER® step-down voltage regulator produced by Texas Instruments. This device is designed for ease of use, requiring a minimum number of external components. It incorporates a voltage mode constant frequency PWM architecture and input voltage feedforward to stabilize the loop gain against variations in input voltage. This regulator is part of the SIMPLE SWITCHER® family, which simplifies the design process using the TI WEBENCH® design tool.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VIN to GND | - | - | 43 | V |
| EN Pin Voltage | -0.5 | - | 6 | V |
| SS, RT/SYNC Pin Voltage | -0.5 | - | 7 | V |
| SW to GND | -5 | - | VIN | V |
| BOOT Pin Voltage | - | - | VSW + 7 | V |
| FB Pin Voltage | -0.5 | - | 7 | V |
| Junction Temperature | - | - | 150 | °C |
| Output Voltage (Fixed) | - | 5.0 | - | V |
| Output Current | - | 1 | - | A |
| Switching Frequency | 400 | 500 | 600 | kHz |
| Quiescent Current | - | 3.4 | - | mA |
| Standby Quiescent Current | 25 | 40 | - | µA |
| Current Limit | 1.2 | 1.5 | 1.8 | A |
Key Features
- Internal Loop Compensation: Designed to provide stability over a wide range of external power stage components.
- Adjustable Soft-Start: Feature provided through the selection of a single external capacitor.
- Thermal Shutdown and Current Limiting: Protects against accidental overloads.
- Frequency Adjustment and Synchronization: Allows for external synchronization and frequency adjustment.
- Low Quiescent Current: Draws only 25 µA in shutdown mode.
- Exposed Pad for Thermal Connection: Enhances thermal performance by connecting to the PCB ground.
- WEBENCH® Design Tool Support: Simplifies design using external component calculation, electrical simulation, thermal simulation, and Build-It boards.
Applications
- Industrial Control: Suitable for various industrial control systems.
- Telecom and Datacom Systems: Used in telecommunications and data communications equipment.
- Embedded Systems: Ideal for embedded system designs.
- Conversions from Standard Input Rails: Supports conversions from standard 24 V, 12 V, and 5 V input rails.
Q & A
- What is the maximum input voltage for the LM22672MRX-5.0/NOPB?
The maximum input voltage is 43 V.
- What is the typical output current of the LM22672MRX-5.0/NOPB?
The typical output current is 1 A.
- What is the switching frequency range of the LM22672MRX-5.0/NOPB?
The switching frequency range is from 400 kHz to 600 kHz.
- How does the LM22672MRX-5.0/NOPB protect against overloads?
The device features thermal shutdown and current limiting to protect against accidental overloads.
- What is the quiescent current in shutdown mode?
The quiescent current in shutdown mode is typically 25 µA.
- Can the LM22672MRX-5.0/NOPB be synchronized with an external clock?
Yes, the device allows for external synchronization through the RT/SYNC pin.
- What is the purpose of the exposed pad on the LM22672MRX-5.0/NOPB?
The exposed pad provides a thermal connection to the PCB ground, enhancing thermal performance.
- What design tools are available for the LM22672MRX-5.0/NOPB?
The device is supported by the TI WEBENCH® design tool, which includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards.
- What are the typical applications of the LM22672MRX-5.0/NOPB?
The device is suitable for industrial control, telecom and datacom systems, embedded systems, and conversions from standard input rails.
- How does the adjustable soft-start feature work?
The adjustable soft-start feature is provided through the selection of a single external capacitor.
