LM3670MFX-1.5

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MFX-1.5 is a miniature step-down DC-DC converter manufactured by Texas Instruments, designed for ultra-low voltage circuits. It operates with an input voltage range of 2.5 V to 5.5 V and provides a fixed output voltage of 1.5 V. The device delivers a maximum output current of 350 mA and features an integrated 1 MHz switching frequency. It utilizes a SOT-23-5 package and supports automatic PFM/PWM mode switching for optimized efficiency across varying load conditions.

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.
• Features a compact SOT-23-5 footprint suitable for space-constrained portable applications.
• Supports shutdown functionality to minimize quiescent current consumption during inactive periods.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics requiring efficient power management
• Ultra-low voltage circuit powering in mobile devices
• Battery-operated systems needing extended runtime

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'MFX' indicates tape-and-reel packaging configuration when sourcing. Confirm RoHS compliance status as some legacy variants may not meet current environmental standards. Ensure the fixed 1.5 V output variant matches the design requirement, as adjustable versions exist within the same family. Cross-reference the manufacturer part number against official TI databases to avoid counterfeit components.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.5 V output is required from a single-cell lithium-ion or similar battery source. The 350 mA current limit suits moderate load applications where size is critical. Consider the 1 MHz switching frequency for balancing EMI performance and external component size compared to lower-frequency alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM3670 belongs to Texas Instruments' portfolio of miniature step-down converters targeting ultra-low voltage applications. It succeeds earlier National Semiconductor designs, maintaining compatibility while offering improved integration. The device is part of a broader family including adjustable and higher-current variants like the LM3671 and LM3674.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3670MF-ADJ/NOPB offers adjustable output instead of fixed 1.5 V. LM3671 series provides higher 600 mA output current with similar topology. LM3677 offers increased 3 MHz switching frequency for smaller passive components.