In this project
The LM2674 regulator is a monolithic integrated circuit built with an LMDMOS process. The regulator provides all the active functions for a step-down (buck) switching regulator, capable of driving a 500 mA load current with excellent line and load regulation. The device is available in fixed output voltages of 3.3V, 5.0V, 12V, and an adjustable output version.
The LM2674 operates at a switching frequency of 260 kHz, thus allowing smaller-sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency (>90%), the copper traces on the printed circuit board are the only heat sinking needed.
LM2674 Pinout
LM2674 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | Cb | Bootstrap Capacitor Pin |
| 2 | * | No Connection |
| 3 | * | No Connection |
| 4 | FB | Feedback Pin |
| 5 | ON/OFF' | On/Complement Off Pin |
| 6 | GND | Ground Pin |
| 7 | Vin | Input Voltage Pin |
| 8 | Vsw | Switch Voltage Pin |
LM2674 Key Features
- Uses readily available standard inductors
- 3.3V, 5.0V, 12V, and adjustable output versions
- Adjustable version output voltage range: 1.21V to 37V
- ±1.5% max output voltage tolerance over line and load conditions
- Guaranteed 500mA output load current
- 0.25Ω DMOS Output Switch
- Wide input voltage range: 8V to 40V
- 260 kHz fixed frequency internal oscillator
- TTL shutdown capability, low power standby mode
- Thermal shutdown and current limit protection
Application
- Simple High Efficiency (>90%) Step-Down (Buck) Regulator
- Efficient Pre-Regulator for Linear Regulators
- Positive-to-Negative Converter
You can download this datasheet for LM2674 5V Step-Down Voltage Regulator - Datasheet from the link given below:
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