Overview
The LM22677TJ-ADJ/NOPB is a high-performance step-down DC/DC switching regulator produced by Texas Instruments. It is part of the SIMPLE SWITCHER family, designed to provide an efficient and easy-to-use solution for high-voltage step-down (buck) regulator applications. This regulator incorporates a 42-V N-channel MOSFET switch, capable of delivering up to 5 A of load current. It features excellent line and load regulation, high efficiency (> 90%), and a wide input voltage range of 4.5 V to 42 V. The LM22677 is available in adjustable output voltage options as low as 1.285 V and a fixed 5 V output, making it versatile for various power management needs.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 4.5 V to 42 V |
| Output Current | Up to 5 A |
| Output Voltage Options | Adjustable (as low as 1.285 V), Fixed 5 V |
| Switching Frequency | Default: 500 kHz, Adjustable: 200 kHz to 1 MHz |
| Operating Junction Temperature Range | -40°C to +125°C |
| Package Type | TO-263 (NDR) with 7 pins |
| MOSFET Resistance | 100-mΩ N-Channel MOSFET |
| Feedback Reference Accuracy | ±1.5% |
| Shutdown Current | Typical: 25 µA |
Key Features
- Wide Input Voltage Range: 4.5 V to 42 V
- Internally Compensated Voltage Mode Control
- Stable With Low ESR Ceramic Capacitors
- 100-mΩ N-Channel MOSFET
- Adjustable and Fixed Output Voltage Options
- ±1.5% Feedback Reference Accuracy
- Default Switching Frequency: 500 kHz, Adjustable: 200 kHz to 1 MHz
- Frequency Synchronization Capability
- Precision Enable Input
- Integrated Boot-Strap Diode and Soft-Start
- Fully WEBENCH® Enabled
- AEC-Q100 Grade 1 Qualified for Automotive Applications (LM22677-Q1)
- Thermal Shutdown and Current Limiting for Overload Protection
Applications
The LM22677TJ-ADJ/NOPB is suitable for a variety of applications requiring high-efficiency step-down voltage regulation. These include:
- Automotive Systems: Especially with the LM22677-Q1 version, which is AEC-Q100 Grade 1 Qualified.
- Industrial Power Supplies: Where high reliability and efficiency are crucial.
- Telecommunications Equipment: For powering various components within telecom systems.
- Consumer Electronics: Such as power supplies for laptops, desktops, and other electronic devices.
- Medical Devices: Where precise voltage regulation is essential.
Q & A
- What is the input voltage range of the LM22677TJ-ADJ/NOPB?
The input voltage range is from 4.5 V to 42 V.
- What are the output voltage options for this regulator?
The output voltage can be adjusted as low as 1.285 V or fixed at 5 V.
- What is the default switching frequency of the LM22677TJ-ADJ/NOPB?
The default switching frequency is 500 kHz, but it can be adjusted from 200 kHz to 1 MHz.
- What type of MOSFET is used in the LM22677TJ-ADJ/NOPB?
The regulator uses a 100-mΩ N-Channel MOSFET.
- Is the LM22677TJ-ADJ/NOPB suitable for automotive applications?
Yes, the LM22677-Q1 version is AEC-Q100 Grade 1 Qualified for automotive use.
- What is the operating junction temperature range of the LM22677TJ-ADJ/NOPB?
The operating junction temperature range is from -40°C to +125°C.
- Does the LM22677TJ-ADJ/NOPB have built-in protection features?
Yes, it includes thermal shutdown and current limiting for overload protection.
- How much current does the regulator draw in shutdown mode?
In shutdown mode, the regulator draws only 25 µA (typical).
- Is the LM22677TJ-ADJ/NOPB compatible with the TI WEBENCH tool?
Yes, it is fully WEBENCH® Enabled, allowing for easy design-in and simulation.
- What package type is the LM22677TJ-ADJ/NOPB available in?
The regulator is available in a TO-263 (NDR) package with 7 pins.
