Overview
The LM22671MRX-ADJ/NOPB, produced by Texas Instruments, is a high-efficiency step-down (buck) voltage regulator. This device is part of the SIMPLE SWITCHER® family and is designed to provide a stable and efficient voltage regulation with a minimum number of external components. The LM22671 incorporates a voltage mode constant frequency PWM architecture and features internal loop compensation, which ensures stability over a wide range of external power stage components. It includes a 42 V N-channel MOSFET switch capable of delivering up to 500 mA of load current. The regulator offers excellent line and load regulation, high efficiency (> 90%), and built-in thermal shutdown and current limiting for protection against accidental overloads.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VIN (Supply Voltage) | 4.5 | 42 | V | |
| Junction Temperature Range | –40 | 125 | °C | |
| Output Voltage (ADJ Version) | 1.266 | 1.285 | 1.304 | V |
| Output Voltage (5.0 Version) | 4.925 | 5.0 | 5.075 | V |
| Switch On-Resistance (RDS(ON)) | 0.32 | 0.5 | Ω | |
| Oscillator Frequency (fO) | 400 | 600 | kHz | |
| Minimum On-time (TONMIN) | 100 | 300 | ns | |
| Minimum Off-time (TOFFMIN) | 100 | 300 | ns | |
| Quiescent Current (IQ) | 3.4 | 6 | mA | |
| Standby Quiescent Current (ISTDBY) | 25 | 40 | µA | |
| Current Limit (ICL) | 0.56 | 0.9 | A | |
| Thermal Shutdown Threshold (TSD) | 150 | °C |
Key Features
- Wide Input Voltage Range: 4.5 V to 42 V
- Internally Compensated Voltage Mode Control
- Stable with Low ESR Ceramic Capacitors
- 200 mΩ N-Channel MOSFET Switch
- Output Voltage Options: ADJ (as low as 1.285 V) and fixed 5.0 V
- Adjustable Soft-Start Feature
- Built-in Thermal Shutdown and Current Limiting
- SO PowerPAD™ (Exposed Pad) Package
- AEC-Q100 Grade 1 Qualified (–40°C to +125°C Operating Junction Temperature)
Applications
- Industrial Control Systems
- Telecom and Datacom Systems
- Embedded Systems
- Conversions from Standard 24 V, 12 V, and 5 V Input Rails
Q & A
- What is the input voltage range of the LM22671?
The input voltage range of the LM22671 is from 4.5 V to 42 V.
- What is the maximum output current of the LM22671?
The LM22671 can provide up to 500 mA of load current.
- What are the output voltage options for the LM22671?
The LM22671 offers adjustable output voltage (as low as 1.285 V) and a fixed 5.0 V option.
- Does the LM22671 have built-in protection features?
Yes, the LM22671 includes built-in thermal shutdown and current limiting for protection against accidental overloads.
- What is the operating junction temperature range of the LM22671?
The operating junction temperature range is from –40°C to +125°C.
- Is the LM22671 AEC-Q100 qualified?
Yes, the LM22671 is AEC-Q100 Grade 1 Qualified.
- What type of compensation does the LM22671 use?
The LM22671 uses internal loop compensation designed to provide a stable regulator over a wide range of external power stage components.
- What is the typical quiescent current of the LM22671?
The typical quiescent current (IQ) is 3.4 mA to 6 mA.
- Can the LM22671 be synchronized with an external clock?
Yes, the LM22671 can be synchronized with an external clock up to 1 MHz.
- What is the thermal resistance (RθJA) of the LM22671 in the SO PowerPAD™ package?
The thermal resistance (RθJA) is 60 °C/W.
