Overview
The LM22679TJ-ADJ is a high-voltage step-down (buck) regulator produced by Texas Instruments. It is part of the SIMPLE SWITCHER family, designed to provide an efficient and easy-to-use solution for implementing high-voltage step-down regulators with a minimum number of external components. This regulator incorporates a 42-V N-channel MOSFET switch that can provide up to 5 A of load current, offering excellent line and load regulation along with high efficiency (> 90%).
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 V to 42 V | V |
| Output Voltage Options | Adjustable (as low as 1.285 V), Fixed 5 V | V |
| Switching Frequency | 500 kHz | kHz |
| Operating Junction Temperature Range | –40°C to 125°C | °C |
| MOSFET On-Resistance | 100 mΩ | mΩ |
| Feedback Reference Accuracy | ±1.5% | % |
| Package Type | TO-263-7 | |
| Thermal Shutdown Threshold | 150 °C | °C |
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 soft start and current limit
- Integrated bootstrap diode
- Fully WEBENCH enabled
- AEC-Q100 qualified (LM22679-Q1) for automotive applications
- PFM (exposed pad) package
Applications
- Industrial distributed power applications
- Test and measurement equipment
- Appliances
- General-purpose wide VIN applications
Q & A
- What is the input voltage range of the LM22679TJ-ADJ?
The input voltage range is 4.5 V to 42 V.
- What are the output voltage options for the LM22679TJ-ADJ?
The output voltage can be adjustable (as low as 1.285 V) or fixed at 5 V.
- What is the switching frequency of the LM22679TJ-ADJ?
The switching frequency is 500 kHz.
- What is the operating junction temperature range of the LM22679TJ-ADJ?
The operating junction temperature range is –40°C to 125°C.
- How can the soft-start time be adjusted?
The soft-start time can be adjusted by using an external capacitor connected to the SS pin.
- What is the purpose of the integrated bootstrap diode?
The integrated bootstrap diode is used to supply the high-side gate driver of the power MOSFET.
- Is the LM22679TJ-ADJ AEC-Q100 qualified?
Yes, the LM22679-Q1 version is AEC-Q100 qualified for automotive applications.
- How can the current limit be adjusted?
The current limit can be adjusted by using a single external resistor connected to the IADJ pin.
- What is the thermal shutdown threshold of the LM22679TJ-ADJ?
The thermal shutdown threshold is approximately 150°C.
- Is the LM22679TJ-ADJ compatible with WEBENCH design tools?
Yes, the LM22679TJ-ADJ is fully WEBENCH enabled.
