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National Semiconductor LM2673 SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit Datasheet
The LM2673 is a monolithic integrated circuit providing a step-down (buck) switching regulator capable of driving up to 3A loads with high efficiency (>90%). It features a fixed frequency oscillator (260KHz), softstart capability, and built-in thermal shutdown. Available in fixed output versions (3.3V, 5V, 12V) and an adjustable version (1.2V to 37V). The device is designed for easy integration using off-the-shelf components and supports a wide input voltage range (8V to 40V).
Read onlineNational Semiconductor LM2673 specifications
| Output Voltage | 3.3V, 5V, 12V fixed or adjustable (1.2V to 37V) |
|---|---|
| Efficiency | Up to 94% |
| Input Voltage Range | 8V to 40V |
| Oscillator Frequency | 260 KHz |
| Current Limit | Resistor programmable peak current limit (2A to 5A) |
| Output Voltage Tolerance | +2% |
| Operating Temperature Range | -40°C to +125°C |
All National Semiconductor LM2673 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
- National Semiconductor LM2673 SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit Datasheet 26 p
- National Semiconductor LM2673 Simple Switcher 3A Step-Down Voltage Regulator Datasheet 26 p
- National Semiconductor LM2673 Simple Switcher 3A Step-Down Voltage Regulator Handbook 26 p
Questions answered in these manuals
What is the maximum efficiency of the LM2673?
Efficiency up to 94%.
What is the input voltage range for the LM2673?
8V to 40V.
What does the soft‑start pin do?
A capacitor on the soft‑start pin provides a gradual turn‑on, reducing input surge current when power is applied.
From: National Semiconductor LM2673 Simple Switcher 3A Step-Down Voltage Regulator Datasheet
What is the input voltage range for the LM2673?
The LM2673 operates with an input voltage from 8 V up to 40 V.
From: National Semiconductor LM2673 Simple Switcher 3A Step-Down Voltage Regulator Handbook
What fixed output voltages are available?
Fixed output versions are offered at 3.3 V, 5 V, and 12 V.
From: National Semiconductor LM2673 Simple Switcher 3A Step-Down Voltage Regulator Handbook