LM3670MFX-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3670MFX-ADJ/NOPB is a miniature step-down DC-DC converter from Texas Instruments, designed for ultra-low voltage circuits. It features an adjustable output voltage range of 700 mV to 3.3 V and supports a maximum output current of 350 mA. The device operates with a fixed switching frequency of 1 MHz and accepts input voltages up to 5.5 V. It utilizes a SOT-23-5 surface-mount package and functions within a temperature range of -40°C to +85°C. Key electrical characteristics include a load regulation of 0.0014 %/mA and a quiescent current of 15 µA.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates automatic PFM/PWM mode switching to optimize efficiency across varying load conditions.
• Provides precise adjustable output voltage control ranging from 700 mV to 3.3 V via external feedback resistors.
• Features low quiescent current operation to minimize power consumption in standby or light-load scenarios.

Voltage Regulators - DC DC Switching Regulators Applications

• Ultra-low voltage circuit power management
• Portable electronic devices requiring compact power solutions
• Battery-powered systems needing high efficiency at light loads

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix NOPB indicates lead-free and RoHS compliance status as per manufacturer documentation. Confirm that the SOT-23-5 package dimensions align with your PCB footprint requirements. Ensure input voltage does not exceed the 5.5 V absolute maximum rating during operation. Check application notes for recommended external component values to achieve stable performance within the specified temperature range.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a small form factor is critical due to its SOT-23-5 packaging. Choose the adjustable variant over fixed-output models if system design requires flexible voltage levels between 700 mV and 3.3 V. Consider the 1 MHz switching frequency for balancing component size and electromagnetic interference. Evaluate the 350 mA current limit against peak load demands to ensure adequate headroom.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3670 series of switching regulators manufactured by Texas Instruments. It is categorized under PMIC - Power Management ICs and specifically functions as a step-down converter. The device is part of the broader portfolio of SIMPLE SWITCHER® controllers known for integrated power switches and compact designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3670MFX-1.875/NOPB offers a fixed 1.875 V output option within the same series. LM3671MFX-ADJ/NOPB provides higher current capability but may differ in thermal characteristics. Verify pinout compatibility and thermal pad requirements before substituting with other buck converters in the LM36xx family.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the minimum output voltage achievable with the LM3670MFX-ADJ/NOPB?

The minimum adjustable output voltage is 700 mV, determined by the internal reference voltage and feedback resistor network.

Does the LM3670MFX-ADJ/NOPB support shutdown mode?

Yes, the device includes a shutdown feature to reduce quiescent current when the system is inactive.