Product details

Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Vout (Min) (V) 1.1 Vout (Max) (V) 3.3 Iout (Max) (A) 0.6 Iq (Typ) (uA) 16 Switching frequency (Min) (kHz) 1600 Switching frequency (Max) (kHz) 2600 Features Enable, Light Load Efficiency, Synchronous Rectification Operating temperature range (C) -40 to 85 Rating Catalog Regulated outputs (#) 1
Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Vout (Min) (V) 1.1 Vout (Max) (V) 3.3 Iout (Max) (A) 0.6 Iq (Typ) (uA) 16 Switching frequency (Min) (kHz) 1600 Switching frequency (Max) (kHz) 2600 Features Enable, Light Load Efficiency, Synchronous Rectification Operating temperature range (C) -40 to 85 Rating Catalog Regulated outputs (#) 1
DSBGA (YZR) 5 2 mm² 1.092 x 1.422 DSBGA (YZR) 5 2 mm² 1.422 x 1.092 SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 USON (NKH) 6 4 mm² 2 x 2
  • LM3671-Q1 is Qualified for Automotive Applications
  • AEC Q100-Qualified With the Following Results
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature Range
  • 16-µA Typical Quiescent Current
  • 600-mA Maximum Load Capability
  • 2-MHz PWM Fixed Switching Frequency (Typical)
  • Automatic PFM-PWM Mode Switching
  • Internal Synchronous Rectification for High Efficiency
  • Internal Soft Start
  • 0.01-µA Typical Shutdown Current
  • Operates from a Single Li-Ion Cell Battery
  • Only Three Tiny Surface-Mount External Components Required (One Inductor, Two Ceramic Capacitors)
  • Current Overload and Thermal Shutdown Protection
  • Available in Fixed Output Voltages and Adjustable Version
  • LM3671-Q1 is Qualified for Automotive Applications
  • AEC Q100-Qualified With the Following Results
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature Range
  • 16-µA Typical Quiescent Current
  • 600-mA Maximum Load Capability
  • 2-MHz PWM Fixed Switching Frequency (Typical)
  • Automatic PFM-PWM Mode Switching
  • Internal Synchronous Rectification for High Efficiency
  • Internal Soft Start
  • 0.01-µA Typical Shutdown Current
  • Operates from a Single Li-Ion Cell Battery
  • Only Three Tiny Surface-Mount External Components Required (One Inductor, Two Ceramic Capacitors)
  • Current Overload and Thermal Shutdown Protection
  • Available in Fixed Output Voltages and Adjustable Version

The LM3671 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 600-mA load current, over the entire input voltage range. There are several different fixed voltage output options available as well as an adjustable output voltage version range from 1.1 V to 3.3 V.

The device offers superior features and performance for mobile phones and similar portable systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typical). Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typical) during light load and standby operation. Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typical).

A high-switching frequency of 2 MHz (typical) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor, and two ceramic capacitors, are required.

For all available packages, see the orderable addendum at the end of the datasheet.

The LM3671 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 600-mA load current, over the entire input voltage range. There are several different fixed voltage output options available as well as an adjustable output voltage version range from 1.1 V to 3.3 V.

The device offers superior features and performance for mobile phones and similar portable systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typical). Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typical) during light load and standby operation. Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typical).

A high-switching frequency of 2 MHz (typical) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor, and two ceramic capacitors, are required.

For all available packages, see the orderable addendum at the end of the datasheet.

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Technical documentation

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Type Title Date
* Data sheet LM3671/-Q1 2-MHz, 600-mA Step-Down DC-DC Converter datasheet (Rev. S) 12 May 2016
Application note A Topical Index of TI Low Power Buck DC/DC Application Notes (Rev. A) 25 Jun 2021
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article When to select an integrated inductor DC/DC module over a linear regulator 16 May 2016
Application note Analog Applications Journal 3Q 2015 24 Jul 2015
Application note Transient-testing platforms and automation techniques for LDOs and buck regulato 24 Jul 2015
User guide AN-1395 LM3671 Evaluation Board (Rev. F) 30 Apr 2013
Application note Power Management Design for Applications Processors 22 Mar 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM3671MF-1.5EV — 2MHz, 600mA Step-Down DC-DC Converter in SOT23-5 and 5-Bump Micro SMD

The LM3671 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. The LM3671 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd (...)

In stock
Limit: 5
Evaluation board

LM3671MF-1.8EV — 2MHz, 600mA Step-Down DC-DC Converter in SOT23-5 and 5-Bump Micro SMD

The LM3671 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. The LM3671 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd (...)

In stock
Limit: 5
Evaluation board

LM3671TL-1.8EV — 2MHz, 600mA Step-Down DC-DC Converter in SOT23-5 and 5-Bump Micro SMD

The LM3671 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. The LM3671 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd (...)

In stock
Limit: 1
Simulation model

LM3671 TINA-TI Transient Reference Design

SNVM065.TSC (121 KB) - TINA-TI Reference Design
Simulation model

LM3671 TINA-TI Transient Spice Model

SNVM066.ZIP (10 KB) - TINA-TI Spice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Reference designs

TIDA-00133 — Uncompressed Digital Video SerDes over Coax for Automotive Mega Pixel CMOS Camera Reference Design

The TIDA-00133 reference design is a high speed serial video interface to connect a remote automotive camera module to a display or machine vision processing system. It uses TIs FPD-Link III SerDes technology to transmit uncompressed MegaPixel video data, bidirectional control signals and power (...)
Package Pins Download
DSBGA (YZR) 5 View options
SOT-23 (DBV) 5 View options
USON (NKH) 6 View options

Ordering & quality

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