LM3670MF-1.5

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MF-1.5 is a miniature step-down DC-DC converter manufactured by Texas Instruments, designed for ultra-low voltage circuits. It operates within an input voltage range of 2.5 V to 5.5 V and provides a fixed output voltage of 1.5 V. The device supports a maximum output current of 350 mA and features automatic PFM/PWM mode switching for optimized efficiency across varying load conditions. It utilizes voltage-mode control with pulse width modulation technology. The component is housed in a compact SOT-23 package (TSOP5/6) and is rated for operation between -40 °C and +85 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Automatic transition between Pulse Frequency Modulation and Pulse Width Modulation modes to maintain high efficiency under light and heavy loads.
• Compact SOT-23-5 packaging enables significant reduction in printed circuit board area for space-constrained designs.
• Integrated synchronous rectification minimizes power losses and improves overall conversion efficiency.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics requiring efficient power management from single-cell lithium-ion batteries
• Ultra-low voltage digital logic circuits and microcontrollers
• Battery-powered sensor nodes and IoT devices

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix configuration against the official Texas Instruments datasheet to ensure compatibility with required output voltage and package type. Confirm RoHS compliance status as indicated in the product documentation, noting that some variants may carry non-compliant markings. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and traceability before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing systems powered by single-cell lithium-ion or lithium-polymer batteries requiring a stable 1.5 V rail. Ensure the application load does not exceed the 350 mA output limit. Consider the thermal performance within the SOT-23 package if operating near the upper temperature limits. Verify that the input voltage remains within the specified 2.5 V to 5.5 V range for proper regulation.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM3670 belongs to Texas Instruments' family of miniature step-down converters aimed at portable applications. It shares architectural similarities with other low-voltage regulators but is distinct in its fixed 1.5 V output variant. This specific model differs from adjustable versions like the LM3670MF-ADJ/NOPB by providing a pre-set output voltage, simplifying external component selection.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other fixed-output buck converters from Texas Instruments such as the LM3671 series, though pinout and electrical specifications must be verified. Alternative manufacturers may offer compatible parts, but careful evaluation of package dimensions and thermal characteristics is required.