Overview
The LM22676MRX-5.0/NOPB is a high-efficiency step-down (buck) regulator from Texas Instruments, designed to provide a simple and efficient solution for voltage regulation needs. This regulator is part of the SIMPLE SWITCHER® family, which emphasizes ease of use with a minimum number of external components. The LM22676 incorporates a 42 V N-channel MOSFET switch capable of delivering up to 3 A of load current, making it suitable for a wide range of applications requiring high voltage step-down conversion.
The regulator features excellent line and load regulation, high efficiency (> 90%), and a fixed switching frequency of 500 kHz. This allows for the use of small external components and ensures good transient response. The device also includes a precision enable pin, integrated soft-start, and built-in thermal shutdown and current limiting for protection against overloads.
Key Specifications
| Parameter | Value |
|---|---|
| Control Mode | Voltage Mode |
| Input Voltage Range | 4.5 V to 42 V |
| Output Voltage | Fixed: 5 V, Adjustable: as low as 1.285 V |
| Maximum Output Current | 3 A |
| Switching Frequency | 500 kHz |
| Operating Junction Temperature Range | -40°C to 125°C |
| Package Type | SO PowerPAD (Exposed Pad) |
| Package Pins | 8 |
| Quiescent Current (Typ) | 3.4 mA |
| Feedback Reference Accuracy | ±1.5% |
| MOSFET Resistance | 100 mΩ (PSOP-8 Package), 120 mΩ (PFM Package) |
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%)
- Precision Enable Pin
- Integrated Boot-Strap Diode and Soft-Start
- Fully WEBENCH® Enabled for easy design and simulation
- AEC-Q100 Grade 1 Qualified for Automotive Applications (LM22676Q)
- Thermal Shutdown and Current Limiting for Overload Protection
Applications
The LM22676MRX-5.0/NOPB is suitable for a variety of applications requiring high-efficiency step-down voltage regulation. These include:
- Automotive Electronics: Given its AEC-Q100 Grade 1 qualification, it is ideal for automotive systems that require robust and reliable power management.
- Industrial Power Supplies: The wide input voltage range and high efficiency make it suitable for industrial power supply applications.
- Telecommunications: It can be used in telecom equipment where high reliability and efficiency are crucial.
- Consumer Electronics: The regulator is also applicable in consumer electronics that require efficient and compact power solutions.
Q & A
- What is the input voltage range of the LM22676MRX-5.0/NOPB?
The input voltage range is from 4.5 V to 42 V.
- What are the output voltage options for the LM22676MRX-5.0/NOPB?
The output voltage can be fixed at 5 V or adjustable down to 1.285 V.
- What is the maximum output current of the LM22676MRX-5.0/NOPB?
The maximum output current is 3 A.
- What is the switching frequency of the LM22676MRX-5.0/NOPB?
The switching frequency is 500 kHz.
- What is the operating junction temperature range of the LM22676MRX-5.0/NOPB?
The operating junction temperature range is -40°C to 125°C.
- Does the LM22676MRX-5.0/NOPB have built-in protection features?
Yes, it includes thermal shutdown and current limiting for overload protection.
- Is the LM22676MRX-5.0/NOPB suitable for automotive applications?
Yes, the LM22676Q version is AEC-Q100 Grade 1 Qualified, making it suitable for automotive use.
- What design tools are available for the LM22676MRX-5.0/NOPB?
The device is fully WEBENCH® Enabled, allowing for easy design, electrical simulation, thermal simulation, and Build-It boards.
- What is the quiescent current of the LM22676MRX-5.0/NOPB in shutdown mode?
In shutdown mode, the regulator draws only 25 µA (typ).
- Does the LM22676MRX-5.0/NOPB support low ESR ceramic capacitors?
Yes, it is stable with low ESR ceramic capacitors.
