Overview
The LM22678TJ-ADJ/NOPB is a high-efficiency step-down (buck) voltage regulator from Texas Instruments, part of their SIMPLE SWITCHER® family. This regulator is designed to provide an efficient and easy-to-use solution for high-voltage step-down applications. It incorporates a 42-V N-channel MOSFET switch capable of providing up to 5 A of load current. The device features a wide input voltage range of 4.5 V to 42 V, making it versatile for various power supply needs. The LM22678TJ-ADJ/NOPB is available in a TO-263 (NDR) package with 7 pins and operates over a junction temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 4.5 | 42 | V | |
| Output Current | 5 | A | ||
| Output Voltage Options | 1.285 (ADJ) | 5.0 (Fixed) | V | |
| Switching Frequency | 400 | 500 | 600 | kHz |
| Feedback Reference Accuracy | ±1.5% | |||
| Operating Junction Temperature Range | –40 | 125 | °C | |
| Thermal Shutdown Threshold | 150 | °C | ||
| Enable Threshold Voltage (Falling) | 1.3 | 1.6 | 1.9 | V |
| Enable Input Current | 6 | µA | ||
| Shutdown Current | 25 | µA | ||
| Package Type | TO-263 (NDR) | |||
| Pins | 7 |
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
- Output voltage options: -ADJ (outputs as low as 1.285 V) and -5.0 (output fixed to 5 V)
- ±1.5% Feedback reference accuracy
- Switching frequency of 500 kHz
- Precision enable pin
- Integrated bootstrap diode
- Integrated soft-start (approximately 500 µs)
- Fully WEBENCH enabled
- Automotive-grade option (LM22678-Q1) AEC-Q100 grade 1 qualified
- Thermal shutdown and current limiting for protection
Applications
- Industrial Control
- Telecom and Datacom Systems
- Embedded Systems
- Conversions from standard 24V, 12V, and 5V input rails
Q & A
- What is the input voltage range of the LM22678TJ-ADJ/NOPB?
The input voltage range is from 4.5 V to 42 V.
- What are the output voltage options for the LM22678TJ-ADJ/NOPB?
The output voltage options are -ADJ (outputs as low as 1.285 V) and -5.0 (output fixed to 5 V).
- What is the switching frequency of the LM22678TJ-ADJ/NOPB?
The switching frequency is 500 kHz.
- What is the operating junction temperature range of the LM22678TJ-ADJ/NOPB?
The operating junction temperature range is from –40°C to 125°C.
- Does the LM22678TJ-ADJ/NOPB have built-in thermal shutdown and current limiting?
- What is the typical shutdown current of the LM22678TJ-ADJ/NOPB?
The typical shutdown current is 25 µA.
- Is the LM22678TJ-ADJ/NOPB automotive-grade qualified?
The LM22678-Q1 version is AEC-Q100 grade 1 qualified.
- What is the purpose of the precision enable pin on the LM22678TJ-ADJ/NOPB?
The precision enable pin allows simplification of regulator control and system power sequencing.
- Does the LM22678TJ-ADJ/NOPB have an integrated soft-start feature?
- Is the LM22678TJ-ADJ/NOPB fully WEBENCH enabled?
