LTC3672B-2

PRODUCTION

Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm × 2mm DFN

Part Models: 2
1ku List Price: Starting From $2.35

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Overview

Triple Output Supply From a Single 2.9V to 5.5V Input
Buck DC/DC: Fixed 1.2V Output, Up to 400mA
LDO1: Fixed 2.8V Output, Up to 150mA
LDO2: Fixed 1.8V Output, Up to 150mA
±2.5% Reference Accuracy
Constant-Frequency 2.25MHz Operation

Minimum External Component Count
Current Mode Operation for Excellent Line and Load Transient Response
Internal Soft-Start for Each Output
Single Enable Pin Turns On/Shuts Down All Three Outputs
Tiny 2mm × 2mm × 0.75mm DFN Package

The LTC3672B-2 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low-dropout linear regulators (LDOs). Constant-frequency 2.25MHz operation is maintained down to very light loads. The input supply range of 2.9V to 5.5V is especially well-suited for single-cell Lithium-Ion and Lithium-Polymer applications, and for powering low voltage ASICs from 3.3V or 5V rails.

The LTC3672B-2 regulates 1.2V at the buck output, 2.8V at the LDO1 output, and 1.8V at the LDO2 output. External component count is minimal—all that is needed is a single inductor, an input capacitor, and output capacitors for each of the three outputs. Control loop compensation is internal to the LTC3672B-2.

The LTC3672B-2 is available in a 2mm × 2mm × 0.75mm 8-Lead DFN package.


	Buck V_OUT	LDO 1	LDO 2
LTC3672B-1	1.8V	1.2V	2.8V
LTC3672B-2	1.2V	2.8V	1.8V

Applications

DMB and DVB-H Cellphones
Handheld Products (PDA, PMP, GPS)
Multivoltage Power for Digital Logic, I/O, FPGAs, CPLDs, ASICs, CPUs, and RF Chipsets

Part Models: 2
1ku List Price: Starting From $2.35

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3672BEDC-2#TRMPBF	8-Lead DFN (2mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3672BEDC-2#TRPBF	8-Lead DFN (2mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Switching Regulators & Controllers 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Tools & Simulations

LTspice 1

LTC3672B-2 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LTC3672B-1
LTC3672B-2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.