LTC3822-1 - No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller

Features

  • Dual N-Channel MOSFET Synchronous Drive
  • No Current Sense Resistor Required
  • Optimized for 3.3VIN and Li-Ion Applications
  • Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
  • ±1% 0.6V Reference
  • Low Dropout Operation: 99% Duty Cycle
  • Phase-Lockable or Adjustable Frequency: 250kHz to 750kHz
  • Internal Soft-Start Circuitry
  • Tracking and Adjustable Soft-Start Input
  • Selectable Maximum Peak Current Sense Threshold
  • Selectable Burst Mode®/ Forced Continuous/Pulse Skipping Mode at Light Load
  • Digital RUN Control Pin
  • Output Overvoltage Protection
  • Micropower Shutdown: IQ = 7.5µA
  • Tiny Thermally Enhanced 12-Pin (3mm × 3mm) DFN or 16-Pin Narrow SSOP Packages

Typical Application

LTC3822-1 Typical Application
LTC3822-1 Typical Application

Description

The LTC3822-1 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency.

Burst Mode operation provides high efficiency at light loads. The 99% maximum duty cycle provides low dropout operation, extending operating time in battery-powered systems.

The operating frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3822-1 can be synchronized to an external clock from 250kHz to 750kHz.

The LTC3822-1 is available in the tiny footprint thermally enhanced 12-pin DFN package or 16-pin narrow SSOP package.

  Features
LTC3822 Internal soft-start, 340uA in sleep mode
LTC3822-1 External soft start, selectable pulse skip/Burst Mode operation, tracking, phase lockable, power good (SSOP-16 package only), 105uA in sleep mode

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
LTC3822EDD-1#PBF 3x3 DFN-12 DD E 05-08-1725 Yes
LTC3822EDD-1#TRPBF 3x3 DFN-12 DD E 05-08-1725 Yes
LTC3822EGN-1#PBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LTC3822EGN-1#TRPBF SSOP-16 GN E 05-08-1641 (GN16) Yes


LTC3822-1 Package Drawing
LTC3822-1 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
LTC3822EDD-1#PBF 3x3 DFN-12 E $2.66 $1.75 Yes
LTC3822EDD-1#TRPBF 3x3 DFN-12 E $1.81 Yes
LTC3822EGN-1#PBF SSOP-16 E $2.66 $1.75 Yes
LTC3822EGN-1#TRPBF SSOP-16 E $1.81 Yes
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* 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
DC1105A LTC3822EDD-1 Demo Board $100.00
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Click here to view our complete list of demo boards

Applications

  • Single Cell Li-Ion Powered Systems
  • 3.3VIN Systems

Product Notifications

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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

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LTC3822
LTC3822-1

Technical Support