LM3670MF-1.8/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MF-1.8/NOPB is a synchronous step-down DC-DC converter manufactured by Texas Instruments, originally part of the National Semiconductor portfolio. It operates with an input voltage range of 2.7 V to 5.5 V and provides a fixed output voltage of 1.8 V at up to 600 mA load current. The device utilizes a 1 MHz switching frequency and features internal synchronous rectification for high efficiency. It is housed in a compact SOT-23-5 package and includes protection mechanisms such as thermal shutdown and current overload protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Internal synchronous rectification ensures high conversion efficiency during PWM mode operation.
• Fixed 1 MHz switching frequency allows for the use of minimal external surface-mount components.
• Integrated thermal shutdown and current overload protection enhance operational reliability.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable wireless mobile phones
• Digital cameras
• MP3 players
• Personal digital assistants (PDAs)
• Wireless LAN devices

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the ordering suffix /NOPB confirms lead-free compliance and RoHS adherence. Confirm the manufacturer designation is Texas Instruments, as National Semiconductor's semiconductor assets were acquired. Ensure the specific fixed output voltage variant matches the design requirement, as other adjustable or different voltage versions exist within the same series.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is required for low-power portable systems powered by single-cell lithium-ion batteries. The fixed 1.8 V output suits logic circuits requiring this specific rail. Consider the SOT-23-5 package constraints for PCB layout. Verify that the 600 mA current limit meets the peak load demands of the target application without requiring external boost stages.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM367x family of miniaturized DC-DC converters designed for battery-powered electronics. The LM3670 specifically offers an adjustable output range, whereas the LM3670MF-1.8/NOPB variant provides a fixed 1.8 V output. These converters are engineered to extend battery life in space-constrained portable applications through high efficiency and small footprint.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3670MF-ADJ/NOPB serves as the adjustable output counterpart within the same series. LM3671 series devices offer similar performance but operate at a higher 2.6 MHz switching frequency. Cross-reference datasheets to ensure pin compatibility and electrical parameter alignment before substitution.