Overview
The LM2674MX-5.0, produced by Texas Instruments (formerly National Semiconductor), is a high-efficiency step-down (buck) switching regulator. This device is part of the LM2674 series, which is designed to provide all the active functions necessary for a step-down DC-DC converter. The LM2674MX-5.0 is capable of delivering up to 500 mA of load current with excellent line and load regulation. It operates with a fixed output voltage of 5 V and features a wide input voltage range of 8 V to 40 V. The regulator is known for its simplicity, requiring only a minimum number of external components, and includes patented internal frequency compensation and a fixed frequency oscillator at 260 kHz.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Output Voltage (VOUT) | VIN = 8 V to 40 V, ILOAD = 20 mA to 500 mA | 4.925 | 5 | 5.075 | V |
| Efficiency (η) | VIN = 12 V, ILOAD = 500 mA | 90% | - | - | % |
| Input Voltage Range (VIN) | - | 8 | - | 40 | V |
| Output Current (ILOAD) | - | - | - | 500 | mA |
| Oscillator Frequency (fO) | - | 225 | 260 | 275 | kHz |
| Switch ON-resistance (RDS(ON)) | ISWITCH = 500 mA | 0.25 | 0.4 | 0.6 | Ω |
| Quiescent Current (IQ) | VFEEDBACK = 8 V | 2.5 | 3.6 | - | mA |
| Standby Quiescent Current (ISTBY) | ON/OFF pin = 0 V, TJ = 25°C | 50 | 100 | 150 | μA |
Key Features
- High efficiency up to 96%
- Fixed output voltage of 5 V
- Wide input voltage range of 8 V to 40 V
- 500 mA maximum output load current
- 260 kHz fixed frequency internal oscillator
- TTL shutdown capability and low power standby mode
- Thermal shutdown and current limit protection
- Simple design requiring only five external components
- Uses readily available standard inductors
- Available in 8-pin SOIC, PDIP, and 16-pin WSON packages
Applications
- Simple high-efficiency step-down (buck) regulators
- Efficient pre-regulator for linear regulators
- Positive-to-negative converters
Q & A
- What is the maximum output current of the LM2674MX-5.0?
The LM2674MX-5.0 can deliver up to 500 mA of output current. - What is the input voltage range of the LM2674MX-5.0?
The input voltage range is from 8 V to 40 V. - What is the fixed output voltage of the LM2674MX-5.0?
The fixed output voltage is 5 V. - What is the efficiency of the LM2674MX-5.0?
The efficiency can be up to 90%. - What is the switching frequency of the LM2674MX-5.0?
The switching frequency is 260 kHz. - Does the LM2674MX-5.0 have thermal protection?
Yes, it includes thermal shutdown and current limit protection. - How many external components are required for the LM2674MX-5.0?
Only five external components are required. - What types of packages are available for the LM2674MX-5.0?
It is available in 8-pin SOIC, PDIP, and 16-pin WSON packages. - Can the LM2674MX-5.0 be used in shutdown mode?
Yes, it has a TTL shutdown capability and a low power standby mode. - How does the LM2674MX-5.0 handle current limit conditions?
The device employs current limit protection and frequency foldback under extreme overcurrent or short-circuit conditions.
