Overview
The LM22670MRX-5.0/NOPB is a high-efficiency step-down (buck) voltage regulator produced by Texas Instruments. It is part of the SIMPLE SWITCHER® family, designed to provide an easy-to-use solution for implementing efficient high-voltage step-down regulators with a minimum number of external components. This regulator incorporates a 42 V N-channel MOSFET switch capable of providing up to 3 A of load current, making it suitable for a wide range of applications requiring high efficiency and reliability.
The device features a wide input voltage range of 4.5 V to 42 V, internally compensated voltage mode control, and stability with low ESR ceramic capacitors. It also includes a fixed 5 V output option and an adjustable output voltage option down to 1.285 V. The LM22670 is fully supported by TI's WEBENCH® design tool, which simplifies the design process with features such as external component calculation, electrical simulation, and thermal simulation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 to 42 | V |
| Output Current | Up to 3 | A |
| Output Voltage Options | ADJ (as low as 1.285 V), 5.0 V (fixed) | V |
| Feedback Reference Accuracy | ±1.5% | % |
| Default Switching Frequency | 500 kHz | kHz |
| Adjustable Switching Frequency Range | 200 kHz to 1 MHz | kHz |
| Operating Junction Temperature Range | –40°C to 125°C | °C |
| Package Type | HSOIC (DDA) with 8 pins | |
| Quiescent Current | 25 µA (typ) in shutdown mode | µA |
| Switch On-Resistance | 120 mΩ (PFM Package), 100 mΩ (SO PowerPAD-8 Package) | mΩ |
Key Features
- Wide Input Voltage Range: 4.5 V to 42 V
- Internally Compensated Voltage Mode Control
- Stable with Low ESR Ceramic Capacitors
- High Efficiency (> 90%)
- Fixed 5 V Output and Adjustable Output Voltage Options
- ±1.5% Feedback Reference Accuracy
- Default Switching Frequency of 500 kHz, Adjustable from 200 kHz to 1 MHz
- Adjustable Switching Frequency and Synchronization
- Precision Enable Pin
- Integrated Boot-Strap Diode and Soft-Start
- Thermal Shutdown and Current Limiting for Overload Protection
- Fully WEBENCH® Enabled for Easy Design
- AEC-Q100 Grade 1 Qualified for Automotive Applications (LM22670-Q1)
Applications
The LM22670 is suitable for a variety of applications requiring high-efficiency step-down voltage regulation, including:
- Automotive Systems: Due to its AEC-Q100 Grade 1 qualification, it is ideal for automotive applications where reliability and performance are critical.
- Industrial Power Supplies: Its wide input voltage range and high efficiency make it suitable for industrial power supply designs.
- Consumer Electronics: It can be used in consumer electronics such as set-top boxes, gaming consoles, and other high-power devices.
- Telecommunications: The regulator's stability and efficiency are beneficial in telecommunications equipment.
- Medical Devices: Its precision and reliability make it a good choice for medical device power supplies.
Q & A
- What is the input voltage range of the LM22670?
The input voltage range of the LM22670 is 4.5 V to 42 V.
- What is the maximum output current of the LM22670?
The LM22670 can provide up to 3 A of load current.
- What are the output voltage options for the LM22670?
The LM22670 offers fixed 5 V output and adjustable output voltage options down to 1.285 V.
- What is the default switching frequency of the LM22670?
The default switching frequency is 500 kHz, but it can be adjusted from 200 kHz to 1 MHz.
- Does the LM22670 support frequency synchronization?
- What is the operating junction temperature range of the LM22670?
The operating junction temperature range is –40°C to 125°C.
- Is the LM22670 suitable for automotive applications?
- What is the quiescent current in shutdown mode?
The quiescent current in shutdown mode is typically 25 µA.
- Does the LM22670 have built-in protection features?
- Is the LM22670 supported by any design tools?
