LTC3872-1 - 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®3872-1 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 LTC3872-1 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.
LTC3872-1 has the same functionality as the standard LTC3872 except that it has no frequency foldback in current limit.
High switching frequency of 550kHz allows the use of a small inductor. The LTC3872-1 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-1#PBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LTC3872EDDB-1#TRMPBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LTC3872EDDB-1#TRPBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LTC3872ETS8-1#PBF | SOT-23 | TS8 | E | 05-08-1637 | Yes |
| LTC3872ETS8-1#TRMPBF | SOT-23 | TS8 | E | 05-08-1637 | Yes |
| LTC3872ETS8-1#TRPBF | SOT-23 | TS8 | E | 05-08-1637 | Yes |
| LTC3872HDDB-1#PBF | 3x2 DFN-8 | DDB | H | 05-08-1702 | Yes |
| LTC3872HDDB-1#TRMPBF | 3x2 DFN-8 | DDB | H | 05-08-1702 | Yes |
| LTC3872HDDB-1#TRPBF | 3x2 DFN-8 | DDB | H | 05-08-1702 | Yes |
| LTC3872HTS8-1#PBF | SOT-23 | TS8 | H | 05-08-1637 | Yes |
| LTC3872HTS8-1#TRMPBF | SOT-23 | TS8 | H | 05-08-1637 | Yes |
| LTC3872HTS8-1#TRPBF | SOT-23 | TS8 | H | 05-08-1637 | Yes |
| LTC3872IDDB-1#PBF | 3x2 DFN-8 | DDB | I | 05-08-1702 | Yes |
| LTC3872IDDB-1#TRMPBF | 3x2 DFN-8 | DDB | I | 05-08-1702 | Yes |
| LTC3872IDDB-1#TRPBF | 3x2 DFN-8 | DDB | I | 05-08-1702 | Yes |
| LTC3872ITS8-1#PBF | SOT-23 | TS8 | I | 05-08-1637 | Yes |
| LTC3872ITS8-1#TRMPBF | SOT-23 | TS8 | I | 05-08-1637 | Yes |
| LTC3872ITS8-1#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-1#PBF | 3x2 DFN-8 | E | $2.57 | Yes | ||
| LTC3872EDDB-1#TRMPBF | 3x2 DFN-8 | E | $2.57 | $1.85 | Yes | |
| LTC3872EDDB-1#TRPBF | 3x2 DFN-8 | E | $2.57 | $1.80 | Yes | |
| LTC3872ETS8-1#PBF | SOT-23 | E | $2.57 | Yes | ||
| LTC3872ETS8-1#TRMPBF | SOT-23 | E | $2.57 | $1.85 | Yes | |
| LTC3872ETS8-1#TRPBF | SOT-23 | E | $2.57 | $1.80 | Yes | |
| LTC3872HDDB-1#PBF | 3x2 DFN-8 | H | $3.36 | Yes | ||
| LTC3872HDDB-1#TRMPBF | 3x2 DFN-8 | H | $3.36 | $2.40 | Yes | |
| LTC3872HDDB-1#TRPBF | 3x2 DFN-8 | H | $3.36 | $2.35 | Yes | |
| LTC3872HTS8-1#PBF | SOT-23 | H | $3.36 | Yes | ||
| LTC3872HTS8-1#TRMPBF | SOT-23 | H | $3.36 | $2.40 | Yes | |
| LTC3872HTS8-1#TRPBF | SOT-23 | H | $3.36 | $2.35 | Yes | |
| LTC3872IDDB-1#PBF | 3x2 DFN-8 | I | $2.96 | Yes | ||
| LTC3872IDDB-1#TRMPBF | 3x2 DFN-8 | I | $2.96 | $2.12 | Yes | |
| LTC3872IDDB-1#TRPBF | 3x2 DFN-8 | I | $2.96 | $2.07 | Yes | |
| LTC3872ITS8-1#PBF | SOT-23 | I | $2.96 | Yes | ||
| LTC3872ITS8-1#TRMPBF | SOT-23 | I | $2.96 | $2.12 | Yes | |
| LTC3872ITS8-1#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-B | LTC3872-1ETS8 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-1#PBF | 3x2 DFN-8 | H | $3.36 | Yes | ||
| LTC3872HDDB-1#TRMPBF | 3x2 DFN-8 | H | $3.36 | $2.40 | Yes | |
| LTC3872HDDB-1#TRPBF | 3x2 DFN-8 | H | $3.36 | $2.35 | Yes | |
| LTC3872HTS8-1#PBF | SOT-23 | H | $3.36 | Yes | ||
| LTC3872HTS8-1#TRMPBF | SOT-23 | H | $3.36 | $2.40 | Yes | |
| LTC3872HTS8-1#TRPBF | SOT-23 | H | $3.36 | $2.35 | Yes | |
| LTC3872IDDB-1#PBF | 3x2 DFN-8 | I | $2.96 | Yes | ||
| LTC3872IDDB-1#TRMPBF | 3x2 DFN-8 | I | $2.96 | $2.12 | Yes | |
| LTC3872IDDB-1#TRPBF | 3x2 DFN-8 | I | $2.96 | $2.07 | Yes | |
| LTC3872ITS8-1#PBF | SOT-23 | I | $2.96 | Yes | ||
| LTC3872ITS8-1#TRMPBF | SOT-23 | I | $2.96 | $2.12 | Yes | |
| LTC3872ITS8-1#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
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Design Tools
LTspice
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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.
