The LM2679 regulator is a monolithic integrated circuit that provides all of the active functions for a stepdown (buck) switching regulator capable of driving up to 5A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The LM2679 consists of a fixed adjustable output version.
Other features include the ability to reduce the input surge current at power-ON by adding a soft-start timing capacitor to gradually turn on the regulator. The LM2679 also has a built-in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions.
LM2679 Pinout
LM2679 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | SWITCH OUT | Switch Output Pin |
| 2 | INPUT | Input Pin |
| 3 | C BOOST | C Boost Pin |
| 4 | GND | Ground Pin |
| 5 | CURRENT ADJ: | Current Adjust Pin |
| 6 | FEEDBACK | Feedback Pin |
| 7 | SOFTSTART | Soft Start Pin |
LM2679 Key Features
- Simple and easy to design with (using off-the-shelf external components)
- Resistor programmable peak current limit over a range of 3A to 7A.
- 120 mΩ DMOS output switch
- 3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versions
- ±2%maximum output tolerance over full line and load conditions
- Wide input voltage range: 8V to 40V
- 260 KHz fixed frequency internal oscillator
- Softstart capability
Application
- Simple to design, high efficiency (>90%) step-down switching regulators
- Efficient system pre-regulator for linear voltage regulators
- Battery chargers
You can download this datasheet for LM2679 Adjustable 5A Step-Down Voltage Regulator – Datasheet from the link given below:
