LM3670MF-2.5/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MF-2.5/NOPB is a fixed-output step-down DC/DC converter manufactured by Texas Instruments, designed for space-constrained applications. It operates within an input voltage range of 2.5 V to 5.5 V and provides a fixed output voltage of 2.5 V with a maximum output current capability of 350 mA. The device integrates a 1 MHz switching frequency and features automatic transition between Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM) modes to optimize efficiency across varying load conditions. It is housed in a compact 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 PFM/PWM mode switching to maintain high efficiency under light and heavy loads
• Utilizes a compact SOT-23-5 package suitable for portable and mobile designs
• Supports wide input voltage range compatible with single-cell lithium-ion battery systems

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics requiring efficient power management
• Battery-powered mobile devices and handheld instruments
• Embedded systems utilizing single-cell lithium-ion power sources

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 datasheet. Ensure the ordering part number matches the required fixed 2.5 V output variant. Confirm the SOT-23-5 package designation aligns with PCB footprint requirements. Cross-reference the latest datasheet revision for any updates regarding thermal characteristics or recommended external component values.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 2.5 V output is required from a single-cell lithium-ion source. The integrated 1 MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 350 mA output limit against peak load demands. The automatic mode switching is advantageous for applications with variable duty cycles to maximize battery life without external control complexity.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3670 family of mini SD DC-DC converters. It shares architectural similarities with other members like the LM3670MF-ADJ/NOPB but differs in having a fixed internal feedback network for the 2.5 V output. It serves as a low-cost, small-footprint solution within Texas Instruments' portfolio of synchronous buck regulators for portable electronics.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3670MF-ADJ/NOPB: Offers adjustable output voltage instead of fixed 2.5 V; requires external resistors. LM3671MFX-2.5/NOPB: Provides higher output current (600 mA) and slightly different switching frequency (2.6 MHz); verify pin compatibility and thermal performance.