Overview
The LM22679TJE-ADJ/NOPB is a high-voltage step-down (buck) regulator produced by Texas Instruments. This device is part of the SIMPLE SWITCHER family and is designed to provide an efficient and easy-to-use solution for voltage regulation. It incorporates a 42-V N-channel MOSFET switch that can deliver up to 5 A of load current, ensuring excellent line and load regulation along with high efficiency (> 90%). The regulator features internally compensated voltage mode control, which eliminates the need for external loop compensation components, and supports a wide input voltage range of 4.5 V to 42 V.
The LM22679TJE-ADJ/NOPB offers adjustable and fixed output voltage options, with the adjustable version (ADJ) capable of output voltages as low as 1.285 V and the fixed version (5.0) set to 5 V. It also includes features such as adjustable soft-start, adjustable current limit, and integrated thermal shutdown and current limiting for protection against overloads.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 4.5 | 42 | V | |
| Output Voltage (ADJ) | 1.285 | 37 | V | |
| Output Voltage (Fixed) | 5.0 | V | ||
| Output Current | 5 | A | ||
| Switching Frequency | 400 | 500 | 600 | kHz |
| Operating Junction Temperature Range | -40 | 125 | °C | |
| Feedback Reference Accuracy | ±1.5% | |||
| MOSFET On-Resistance | 0.10 | 0.14 | 0.20 | Ω |
| Thermal Shutdown Threshold | 150 | °C |
Key Features
- Wide Input Voltage Range: 4.5 V to 42 V
- Internally Compensated Voltage Mode Control: Eliminates the need for external loop compensation components
- Stable with Low-ESR Ceramic Capacitors: Ensures stability with a variety of capacitor types
- 100-mΩ N-channel MOSFET: Provides high efficiency and low on-resistance
- Output Voltage Options: Adjustable (as low as 1.285 V) and fixed (5 V)
- Adjustable Soft-Start: Reduces start-up stresses using an external capacitor
- Adjustable Current Limit: Programmable with a single external resistor
- Integrated Bootstrap Diode: Simplifies the design and reduces component count
- Fully WEBENCH Enabled: Supports easy design and simulation using TI's WEBENCH tool
- AEC-Q100 Qualified (LM22679-Q1): Suitable for automotive applications
Applications
- Industrial Distributed Power Applications: Suitable for various industrial power supply needs
- Test and Measurement Equipment: Reliable voltage regulation for precise measurements
- Appliances: Used in household and commercial appliances requiring efficient power management
- General-Purpose Wide VIN Applications: Versatile enough for a broad range of applications requiring a wide input voltage range
Q & A
- What is the input voltage range of the LM22679TJE-ADJ/NOPB?
The input voltage range is from 4.5 V to 42 V.
- What are the output voltage options for the LM22679TJE-ADJ/NOPB?
The output voltage can be either adjustable (as low as 1.285 V) or fixed at 5 V.
- What is the switching frequency of the LM22679TJE-ADJ/NOPB?
The switching frequency is 500 kHz.
- How does the adjustable soft-start feature work?
The soft-start feature allows the regulator to gradually reach steady-state operation by using an external capacitor connected to the SS pin, reducing start-up stresses.
- Can the current limit be adjusted on the LM22679TJE-ADJ/NOPB?
Yes, the peak switch current limit can be adjusted using a single external resistor connected to the IADJ pin.
- What is the operating junction temperature range of the LM22679TJE-ADJ/NOPB?
The operating junction temperature range is from -40°C to 125°C.
- Is the LM22679TJE-ADJ/NOPB suitable for automotive applications?
The LM22679-Q1 version is AEC-Q100 qualified and suitable for automotive applications.
- What is the purpose of the integrated bootstrap diode?
The integrated bootstrap diode simplifies the design by controlling the power MOSFET and reducing the need for additional components.
- How does the thermal shutdown feature work?
The thermal shutdown feature protects the device by shutting it down if the junction temperature exceeds 150°C and restarting once the temperature drops below 135°C.
- What tool can be used to design and simulate circuits with the LM22679TJE-ADJ/NOPB?
Texas Instruments' WEBENCH tool can be used for easy design and simulation of circuits using the LM22679TJE-ADJ/NOPB.
