Overview
The LM22670MR-ADJ/NOPB is a high-performance, 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 voltage regulation needs. It features a wide input voltage range of 4.5 V to 42 V and can deliver up to 3 A of load current. The device incorporates a 42-V N-channel MOSFET switch and offers excellent line and load regulation along with high efficiency (> 90%). The LM22670MR-ADJ/NOPB is available in adjustable output voltage options, with a minimum output voltage as low as 1.285 V, and a fixed 5-V output option. It also includes internal loop compensation, eliminating the need for external compensation components, and supports adjustable switching frequency and synchronization with an external clock.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VIN Supply Voltage | 4.5 | 42 | V |
| Junction Temperature Range | –40 | 125 | °C |
| Output Current | 3 | A | |
| Switch On-Resistance (RDS(ON)) | 0.10 | 0.16 | Ω |
| Switching Frequency | 400 | 600 | kHz |
| Minimum On-time | 100 | 300 | ns |
| Feedback Reference Accuracy | ±1.5% | ||
| Thermal Shutdown Threshold | 150 | °C | |
| Enable Threshold Voltage | 1.3 | 1.9 | V |
Key Features
- Wide Input Voltage Range: 4.5 V to 42 V
- Internally Compensated Voltage Mode Control: No need for external loop compensation components
- High Efficiency: Greater than 90%
- Adjustable Output Voltage: Minimum output voltage as low as 1.285 V, and a fixed 5-V output option
- Adjustable Switching Frequency: From 200 kHz to 1 MHz with a single external resistor
- Synchronization Capability: Can be synchronized to an external clock
- Precision Enable Pin: Allows for precise control over regulator enable and disable
- Integrated Boot-Strap Diode and Soft-Start: Reduces the need for external components
- Thermal Shutdown and Current Limiting: Protects against accidental overloads
- AEC-Q100 Grade 1 Qualified (Automotive Grade): Suitable for automotive applications with an operating junction temperature range of –40°C to 125°C
Applications
- Industrial Control: Suitable for various industrial control systems requiring stable and efficient voltage regulation
- Telecom and Datacom Systems: Used in telecommunications and data communications equipment for reliable power supply
- Embedded Systems: Ideal for embedded systems that require compact and efficient power management solutions
- Conversions from Standard Input Rails: Can be used for converting standard 24-V, 12-V, and 5-V input rails to lower output voltages
Q & A
- What is the input voltage range of the LM22670MR-ADJ/NOPB?
The input voltage range is from 4.5 V to 42 V.
- What is the maximum output current of the LM22670MR-ADJ/NOPB?
The maximum output current is 3 A.
- Can the switching frequency be adjusted?
- Does the LM22670MR-ADJ/NOPB support synchronization with an external clock?
- What is the minimum output voltage that can be set?
The minimum output voltage is 1.285 V.
- Is the LM22670MR-ADJ/NOPB suitable for automotive applications?
- What is the purpose of the integrated boot-strap diode?
The integrated boot-strap diode is used to control the power MOSFET and eliminates the need for an external diode.
- How does the precision enable pin function?
The precision enable pin allows for precise control over the regulator's enable and disable states, with a threshold voltage between 1.3 V and 1.9 V.
- What protection features are built into the LM22670MR-ADJ/NOPB?
- What is the typical quiescent current in shutdown mode?
