Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck
Power Management PMIC & Multifunction Multitopology DC/DC
 Power Management Switching Regulator Step-Down (Buck) Regulators Buck Regulator Plus LDO

LTC2974 - 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement

LTC3880 - Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

LTC3672B-2 - Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm x 2mm DFN

Features

  • 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

Typical Application

LTC3672B-2 Typical Application
LTC3672B-2 Typical Application

Description

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 Vout
 LDO 1
 LDO 2
LTC3672B-1 1.8V 1.2V 2.8V
LTC3672B-2 1.2V 2.8V 1.8V

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC3672BEDC-2#PBF 2x2 DFN-8 DC8 E 05-08-1719 Yes
LTC3672BEDC-2#TRMPBF 2x2 DFN-8 DC8 E 05-08-1719 Yes
LTC3672BEDC-2#TRPBF 2x2 DFN-8 DC8 E 05-08-1719 Yes


LTC3672B-2 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC3672BEDC-2#PBF 2x2 DFN-8 E $2.79 Yes
LTC3672BEDC-2#TRMPBF 2x2 DFN-8 E $2.79 $2.00 Yes
LTC3672BEDC-2#TRPBF 2x2 DFN-8 E $2.79 $1.95 Yes
Buy Now • Request Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1324A LTC3672BEDC-2 | Synch 400mA, 2.25MHz Step-Down DC/DC Reg w/ Dual 150mA LDOs $100.00
Buy Now
Click here to view our complete list of demo boards

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

People Who Viewed This Product Also Viewed

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC3672B-1
LTC3672B-2

Technical Support