LM3670MFX-1.8/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MFX-1.8/NOPB is a fixed-output synchronous buck 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 at up to 350 mA. The device integrates a 1 MHz switching frequency to minimize external component size. It features automatic transition between Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM) modes to optimize efficiency across varying load conditions. The IC is housed in a compact SOT-23-5 package and supports operation within a temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates synchronous rectification for high efficiency in a miniature footprint
• Automatically switches between PFM and PWM modes based on load current
• Includes internal soft-start circuitry to limit inrush current during startup

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics requiring efficient power management
• Battery-powered devices utilizing single-cell lithium-ion or lithium-polymer sources
• Embedded systems with strict board space limitations

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free and RoHS compliance status as per the manufacturer's latest documentation. Ensure the ordering part number matches the required fixed 1.8V output variant. Confirm the SOT-23-5 package marking and pinout alignment with your PCB layout design before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.8V output is required from a 2.5V to 5.5V input source. It is suitable for loads up to 350 mA where moderate efficiency and small passive component count are priorities. Consider alternative variants if adjustable output or higher current capacity exceeds these specifications.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3670 family of miniaturized step-down DC-DC converters. It shares architectural similarities with other members like the LM3671, though it offers lower output current capability. The series is characterized by its integration of power switches and control logic into a minimal package, targeting ultra-compact portable designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3670MFX-ADJ/NOPB: Offers adjustable output voltage instead of fixed 1.8V; verify feedback network requirements.