LM3670MFX-1.8

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MFX-1.8/NOPB is a miniature step-down DC-DC converter manufactured by Texas Instruments, designed for space-constrained applications. It operates with an input voltage range of 2.5 V to 5.5 V and provides a fixed output voltage of 1.8 V. The device delivers up to 350 mA of output current at a switching frequency of 1 MHz. It features automatic PFM/PWM mode switching to optimize efficiency across varying load conditions. The component is housed in a SOT-23-5 package and supports an operating temperature range from -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates automatic transition between pulse frequency modulation and pulse width modulation modes to maintain high efficiency under light and heavy loads.
• Utilizes a compact SOT-23-5 surface-mount package to minimize printed circuit board area requirements.
• Supports wide input voltage ranges suitable for single-cell lithium-ion battery or 5V bus-powered systems.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics requiring efficient power management from battery sources
• Embedded systems utilizing single-cell lithium-ion batteries
• Space-limited industrial control modules

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix (e.g., NOPB) against the manufacturer's datasheet to confirm RoHS compliance and lead-free status. Ensure the ordering part number matches the required fixed output voltage variant, as other versions within the LM3670 family offer adjustable outputs or different current ratings. Cross-reference the package marking code with official documentation to prevent counterfeit substitution during assembly.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.8 V output is required with moderate current demands up to 350 mA. It is appropriate for designs prioritizing small footprint over higher current capacity found in the LM3671 or LM3674 series. Consider the 1 MHz switching frequency for balancing component size and electromagnetic interference. Verify that the application load profile benefits from the automatic PFM/PWM transition for optimal standby performance.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3670 family of miniaturized step-down converters from Texas Instruments. It shares architectural similarities with the LM3671 and LM3674 series but differs in output current capabilities and switching frequencies. While the LM3671 offers 600 mA and the LM3674 provides similar current with higher frequency options, the LM3670 is optimized for lower current applications requiring a balance of efficiency and physical size.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3670MF-ADJ/NOPB: Offers adjustable output voltage instead of fixed 1.8 V; requires external feedback resistors.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum output current capability of the LM3670MFX-1.8?

The device supports a maximum output current of 350 mA.

Does the LM3670MFX-1.8 support shutdown functionality?

Yes, the component includes a shutdown pin to reduce quiescent current when the system is inactive.