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Details for Texas Instruments


Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
Buy Directly from Texas Instruments (8120 in Stock)
$0.3900 per unit
Series Information for LM3670MF-1.8/NOPB - Texas Instruments


  • feature
    0.1-u00b5A Typical Shutdown Current
  • feature
    1-MHz PWM Fixed Switching Frequency (Typical)
  • feature
    15-u00b5A Typical Quiescent Current
  • feature
    350-mA Maximum Load Capability
  • feature
    Adjustable Output Voltages (VOUT): 0.7 V to 2.5 V
  • feature
    Automatic PFM and PWM Mode Switching
  • feature
    Current Overload Protection
  • feature
    Fixed Output Voltages: 1.2 V, 1.5 V, 1.6 V, 1.8 V, 1.875 V, 3.3V
  • feature
    Input Voltage Range: 2.5 V to 5.5 V
  • feature
    Internal Soft Start
  • feature
    Internal Synchronous Rectification for High Efficiency
  • feature
    Low Dropout Operation u2013 100% Duty Cycle Mode
  • feature
    Only Three Tiny Surface-Mount External
  • feature
    Operates from a Single Li-Ion Cell or Three-Cell NiMH/NiCd Batteries


The LM3670 step-down DC-DC converter is optimized for powering ultralow voltage circuits from a single Li-Ion cell or three-cell NiMH/NiCd batteries. It provides up to 350-mA load current, over an input voltage range from 2.5 V to 5.5 V. There are several different fixed voltage output options available as well as an adjustable output voltage version. The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between pulse width modulation (PWM) low-noise and pulse frequency modulation (PFM) low-current mode offers improved system control. During full-power operation, a fixed-frequency 1-MHz (typical) PWM mode drives loads from approximately 70 mA to 350 mA maximum, with up to 95% efficiency. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 15 µA (typical) during light current loads and system standby. Internal synchronous rectification provides high efficiency (90% to 95% typical at loads between 1 mA and 100 mA). In shutdown mode (enable (EN) pin pulled low) the device turns off and reduces battery consumption to 0.1 µA (typical). The LM3670 is available in a 5-pin SOT-23 package. A high switching frequency (1 MHz typical) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required.


Buck (Step Down)
Input Voltage Min:
Input Voltage Max:
DC / DC Converter IC Case:
No. of Pins:
Output Current:
Output Voltage Nom.:
Switching Frequency:
Operating Temperature Max:
Product Range:
Automotive Qualification Standard:
RoHS Phthalates Compliant:
MSL 1 - Unlimited
No SVHC (27-Jun-2018)

Alternate Descriptions

Avnet America

Conv DC-DC Single Step Down 2.5V to 5.5V 5-Pin SOT-23 T/R

Avnet America product

Avnet Europe

Conv DC-DC Single Step Down 2.5V to 5.5V 5-Pin SOT-23 T/R

Avnet Europe product

Texas Instruments

Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits

Texas Instruments product