LTC3872
PRODUCTIONNo RSENSE Current Mode Boost DC/DC Controller
- Part Models
- 12
- 1ku List Price
- Starting From $2.77
Overview
- 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
The LTC3872 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 RSENSE™ 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) ThinSOT™ package and 8-pin 2mm × 3mm DFN package.
| LTC3872 | LTC3872-1 | |
| Frequency Foldback In Current Limit | Yes | No |
Applications
- Telecom Power Supplies
- 42V Automotive Systems
- 24V Industrial Controls
- IP Phone Power Supplies
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
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 |
|---|---|---|---|
| LTC3872EDDB#TRMPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3872EDDB#TRPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3872ETS8#TRMPBF | 8-Lead SOT-23 | ||
| LTC3872ETS8#TRPBF | 8-Lead SOT-23 | ||
| LTC3872HDDB#TRMPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3872HDDB#TRPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3872HTS8#TRMPBF | 8-Lead SOT-23 | ||
| LTC3872HTS8#TRPBF | 8-Lead SOT-23 | ||
| LTC3872IDDB#TRMPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3872IDDB#TRPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3872ITS8#TRMPBF | 8-Lead SOT-23 | ||
| LTC3872ITS8#TRPBF | 8-Lead SOT-23 |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareTools & Simulations
LTspice 2
- LTC3872 Demo Circuit - High Efficiency 5V Input, 24V Output Boost Converter (3-9.8V to 24V @ 1A)
- LTC3872 Demo Circuit - No Rsense Current Mode Boost Controller (3-4.5V to 5V @ 2A)
Models for the following parts are available in LTspice:
- LTC3872
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.
Evaluation Kits
LTC3872ETS8 Demo Board | 2.75V ≤ VIN ≤ 4.5V; VOUT: 5V @ 2A