The LM3674 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 fixed output voltages and adjustable output voltage versions.

The device offers superior features and performance for mobile phones and similar portable systems. During the Pulse Width Modulation (PWM) mode, the device operates at a fixed-frequency of 2 MHz (typical). Internal synchronous rectification provides high efficiency during the PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typical).

The LM3674 is available in a 5-pin SOT-23 package. A high switching frequency of 2 MHz (typical) allows use of only three tiny external surface-mount components, an inductor and two ceramic capacitors.

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600mA Fully Integrated, Low Noise Step-Down Converter Module in MicroSiP™ Package For smaller BOM size and ease-of-use check out the module alternative with integrated inductor, input and output capacitor.

Technical documentation

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	Type	Title	Date
*	Data sheet	LM3674 2-MHz, 600-mA Step-Down DC-DC Converter in SOT-23 datasheet (Rev. G)	Apr. 24, 2015
	Technical article	Minimize the impact of the MLCC shortage on your power application	Mar. 29, 2019
	Application note	A Topical Index of TI Low Power Buck DC/DC Application Notes	Jan. 17, 2018
	User guide	2-Port USB 3.0 Hub (TIDA-00287)	Aug. 01, 2014
	User guide	AN-1427 LM3674 Evaluation Board (Rev. K)	Apr. 30, 2013

Design & development

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Hardware development

EVALUATION BOARD Download

2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

LM3674MF-1.8EV

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User guide

Description

The LM3674 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. The LM3674 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails (...)

Features

600mA max load current
Input voltage range from 2.7V to 5.5V
Available in fixed and adjustable output voltages ranging from 1.0V to 3.3V
Operates from a single Li-Ion cell Battery
Internal synchronous rectification for high efficiency
Internal soft start
0.01 microA typical shutdown current
2 MHz PWM fixed (...)

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Design tools & simulation

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PSpice® for TI design and simulation tool

PSPICE-FOR-TI — 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 (...)

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Features

Leverages Cadence PSpice Technology
Preinstalled library with a suite of digital models to enable worst-case timing analysis
Dynamic updates ensure you have access to most current device models
Optimized for simulation speed without loss of accuracy
Supports simultaneous analysis of multiple products
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Reference designs

REFERENCE DESIGNS Download

2-Port USB 3.0 hub reference design

TIDA-00287 — This verified reference design is a two-port, USB 3.0 compliant hub. It provides simultaneous SuperSpeed and high-speed/full-speed connections on the upstream port and provides SuperSpeed, high-speed, full-speed, or low-speed connections on the downstream ports.

The hub design provides power control (...)

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Schematic

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User guide