LTC3872 - No RSENSE Current Mode Boost DC/DC Controller
Features
- No Current Sense Resistor Required
- VOUT up to 60V
- Constant Frequency 550kHz Operation
- Internal Soft-Start and Optional External Soft-Start
- Adjustable Current Limit
- Pulse Skipping at Light Load
- VIN Range: 2.75V to 9.8V
- ±1.5% Voltage Reference Accuracy
- Current Mode Operation for Excellent Line and Load Transient Response
- Low Profile (1mm) SOT-23 and 2mm × 3mm DFN Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3872 is a constant frequency current mode boost DC/DC controller that drives an N-channel power MOSFET and requires very few external components. The No RSENSETM architecture eliminates the need for a sense resistor, improves efficiency and saves board space.
The LTC3872 provides excellent AC and DC load and line regulation with ±1.5% output voltage accuracy. It incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.3V.
High switching frequency of 550kHz allows the use of a small inductor. The LTC3872 is available in an 8-lead low profile (1mm) ThinSOTTM package and 8-pin 2mm × 3mm DFN package.
| LTC3872 | LTC3872-1 | |
|---|---|---|
| Frequency Foldback In Current Limit | Yes | No |
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 |
|---|---|---|---|---|---|
| LTC3872EDDB#PBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LTC3872EDDB#TRMPBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LTC3872EDDB#TRPBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LTC3872ETS8#PBF | SOT-23 | TS8 | E | 05-08-1637 | Yes |
| LTC3872ETS8#TRMPBF | SOT-23 | TS8 | E | 05-08-1637 | Yes |
| LTC3872ETS8#TRPBF | SOT-23 | TS8 | E | 05-08-1637 | Yes |
| LTC3872HDDB#PBF | 3x2 DFN-8 | DDB | H | 05-08-1702 | Yes |
| LTC3872HDDB#TRMPBF | 3x2 DFN-8 | DDB | H | 05-08-1702 | Yes |
| LTC3872HDDB#TRPBF | 3x2 DFN-8 | DDB | H | 05-08-1702 | Yes |
| LTC3872HTS8#PBF | SOT-23 | TS8 | H | 05-08-1637 | Yes |
| LTC3872HTS8#TRMPBF | SOT-23 | TS8 | H | 05-08-1637 | Yes |
| LTC3872HTS8#TRPBF | SOT-23 | TS8 | H | 05-08-1637 | Yes |
| LTC3872IDDB#PBF | 3x2 DFN-8 | DDB | I | 05-08-1702 | Yes |
| LTC3872IDDB#TRMPBF | 3x2 DFN-8 | DDB | I | 05-08-1702 | Yes |
| LTC3872IDDB#TRPBF | 3x2 DFN-8 | DDB | I | 05-08-1702 | Yes |
| LTC3872ITS8#PBF | SOT-23 | TS8 | I | 05-08-1637 | Yes |
| LTC3872ITS8#TRMPBF | SOT-23 | TS8 | I | 05-08-1637 | Yes |
| LTC3872ITS8#TRPBF | SOT-23 | TS8 | I | 05-08-1637 | Yes |
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 | |
|---|---|---|---|---|---|---|
| LTC3872EDDB#PBF | 3x2 DFN-8 | E | $2.57 | Yes | ||
| LTC3872EDDB#TRMPBF | 3x2 DFN-8 | E | $2.57 | $1.85 | Yes | |
| LTC3872EDDB#TRPBF | 3x2 DFN-8 | E | $2.57 | $1.80 | Yes | |
| LTC3872ETS8#PBF | SOT-23 | E | $2.57 | Yes | ||
| LTC3872ETS8#TRMPBF | SOT-23 | E | $2.57 | $1.85 | Yes | |
| LTC3872ETS8#TRPBF | SOT-23 | E | $2.57 | $1.80 | Yes | |
| LTC3872HDDB#PBF | 3x2 DFN-8 | H | $3.36 | Yes | ||
| LTC3872HDDB#TRMPBF | 3x2 DFN-8 | H | $3.36 | $2.40 | Yes | |
| LTC3872HDDB#TRPBF | 3x2 DFN-8 | H | $3.36 | $2.35 | Yes | |
| LTC3872HTS8#PBF | SOT-23 | H | $3.36 | Yes | ||
| LTC3872HTS8#TRMPBF | SOT-23 | H | $3.36 | $2.40 | Yes | |
| LTC3872HTS8#TRPBF | SOT-23 | H | $3.36 | $2.35 | Yes | |
| LTC3872IDDB#PBF | 3x2 DFN-8 | I | $2.96 | Yes | ||
| LTC3872IDDB#TRMPBF | 3x2 DFN-8 | I | $2.96 | $2.12 | Yes | |
| LTC3872IDDB#TRPBF | 3x2 DFN-8 | I | $2.96 | $2.07 | Yes | |
| LTC3872ITS8#PBF | SOT-23 | I | $2.96 | Yes | ||
| LTC3872ITS8#TRMPBF | SOT-23 | I | $2.96 | $2.12 | Yes | |
| LTC3872ITS8#TRPBF | SOT-23 | I | $2.96 | $2.07 | Yes | |
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC989B-A | LTC3872ETS8 Demo Board | 2.75V ≤ VIN ≤ 4.5V; VOUT: 5V @ 2A | $75.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3872HDDB#PBF | 3x2 DFN-8 | H | $3.36 | Yes | ||
| LTC3872HDDB#TRMPBF | 3x2 DFN-8 | H | $3.36 | $2.40 | Yes | |
| LTC3872HDDB#TRPBF | 3x2 DFN-8 | H | $3.36 | $2.35 | Yes | |
| LTC3872HTS8#PBF | SOT-23 | H | $3.36 | Yes | ||
| LTC3872HTS8#TRMPBF | SOT-23 | H | $3.36 | $2.40 | Yes | |
| LTC3872HTS8#TRPBF | SOT-23 | H | $3.36 | $2.35 | Yes | |
| LTC3872IDDB#PBF | 3x2 DFN-8 | I | $2.96 | Yes | ||
| LTC3872IDDB#TRMPBF | 3x2 DFN-8 | I | $2.96 | $2.12 | Yes | |
| LTC3872IDDB#TRPBF | 3x2 DFN-8 | I | $2.96 | $2.07 | Yes | |
| LTC3872ITS8#PBF | SOT-23 | I | $2.96 | Yes | ||
| LTC3872ITS8#TRMPBF | SOT-23 | I | $2.96 | $2.12 | Yes | |
| LTC3872ITS8#TRPBF | SOT-23 | I | $2.96 | $2.07 | Yes | |
| Buy Now • Request Samples | ||||||
Applications
- Telecom Power Supplies
- 42V Automotive Systems
- 24V Industrial Controls
- IP Phone Power Supplies
People Who Viewed This Product Also Viewed
- LT3757 - Boost, Flyback, SEPIC and Inverting Controller
- LTC1872 - Constant Frequency Current Mode Step-Up DC/DC Controller in SOT-23
- LTC1871 - Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller
- LT8705 - 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller
- LT3759 - Wide Input Voltage Range Boost/SEPIC/Inverting Controller
- LT1619 - Low Voltage Current Mode PWM Controller
- LTC3786 - Low IQ Synchronous Boost Controller
- LT3080 - Adjustable 1.1A Single Resistor Low Dropout Regulator
- LTC3872-1 - No RSENSE Current Mode Boost DC/DC Controller
- LTC3789 - High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
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
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:
LTC3872
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
