Overview
The LM22674MRE-5.0/NOPB is a high-efficiency step-down (buck) voltage regulator produced by Texas Instruments. This device is part of the SIMPLE SWITCHER® family, designed to provide an easy-to-use solution for implementing high-voltage step-down regulators with a minimum number of external components. The LM22674 incorporates a 42 V N-channel MOSFET switch capable of delivering up to 500 mA of load current, making it suitable for a variety of applications requiring high efficiency and reliability.
The regulator features voltage mode control, internal loop compensation, and a switching frequency of 500 kHz, which allows for the use of small external components and good transient response. It also includes a precision enable input, integrated soft-start, and built-in thermal shutdown and current limiting to protect against accidental overloads.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Voltage Range | 4.5 | 42 | V | |
| Output Voltage (Fixed) | 4.925 | 5.0 | 5.075 | V |
| Output Current | 500 | mA | ||
| Switching Frequency | 400 | 500 | 600 | kHz |
| Operating Junction Temperature Range | -40 | 125 | °C | |
| Feedback Reference Accuracy | ±1.5% | |||
| Switch On-Resistance | 0.2 | 0.32 | 0.4 | Ω |
| Quiescent Current | 3.4 | 6 | mA | |
| Standby Quiescent Current | 25 | 40 | µA |
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
- 200 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)
- Precision Enable Pin: Allows for precise control over regulator start-up and shutdown
- Integrated Boot-Strap Diode and Soft-Start: Simplifies design and reduces the need for external components
- Fully WEBENCH® Enabled: Supports easy design-in with TI's WEBENCH® tool
- Automotive Grade Option (LM22674-Q1): AEC-Q100 Grade 1 Qualified for automotive applications
- Thermal Shutdown and Current Limiting: Protects against accidental overloads
Applications
- Industrial Control: Suitable for industrial automation and control systems
- Telecom and Datacom Systems: Used in telecommunications and data communications equipment
- Embedded Systems: Ideal for embedded systems requiring efficient power management
- Conversions from Standard 24 V, 12 V, and 5 V Input Rails: Versatile for various input voltage conversions
Q & A
- What is the input voltage range of the LM22674?
The input voltage range is from 4.5 V to 42 V.
- What is the maximum output current of the LM22674?
The maximum output current is 500 mA.
- What is the switching frequency of the LM22674?
The switching frequency is 500 kHz.
- Does the LM22674 have internal loop compensation?
Yes, it has internal loop compensation, eliminating the need for external loop compensation components.
- What are the output voltage options for the LM22674?
The output voltage can be either adjustable (as low as 1.285 V) or fixed at 5 V.
- What is the operating junction temperature range of the LM22674?
The operating junction temperature range is from -40°C to 125°C.
- Does the LM22674 have built-in thermal shutdown and current limiting?
Yes, it has built-in thermal shutdown and current limiting to protect against accidental overloads.
- Is the LM22674 fully WEBENCH® enabled?
Yes, it is fully WEBENCH® enabled, supporting easy design-in with TI's WEBENCH® tool.
- Is there an automotive grade version of the LM22674?
Yes, the LM22674-Q1 is an automotive grade product that is AEC-Q100 Grade 1 Qualified.
- What is the quiescent current of the LM22674 in standby mode?
The standby quiescent current is typically 25 µA to 40 µA.
