LTC3872

PRODUCTION

No R_SENSE Current Mode Boost DC/DC Controller

Part Models: 12
1ku List Price: Starting From $2.18

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Part Details

No Current Sense Resistor Required
V_OUT up to 60V
Constant Frequency 550kHz Operation
Internal Soft-Start and Optional External Soft-Start
Adjustable Current Limit
Pulse Skipping at Light Load

V_IN 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 R_SENSE^™ 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

Part Models: 12
1ku List Price: Starting From $2.18

Documentation

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)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872EDDB#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872ETS8#TRMPBF	8-Lead SOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872ETS8#TRPBF	8-Lead SOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872HDDB#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872HDDB#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872HTS8#TRMPBF	8-Lead SOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872HTS8#TRPBF	8-Lead SOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872IDDB#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872IDDB#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872ITS8#TRMPBF	8-Lead SOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3872ITS8#TRPBF	8-Lead SOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice 2

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

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Product Details

Demonstration circuit 989B-A is a single-output boost converter featuring the NO R_SENSE LTC3872, a nonsynchronous tiny, boost controller. The input voltage is from 3.0V to 4.5V without output de-rating. The demo board has a 5V@2A (max) output. The minimum input voltage is 2.75V. When the input voltage is lower than 3V, output current should be de-rated. NO R_SENSE technique reduces both solution size and power dissipation. The switching frequency is fixed at 550 kHz. With current mode control and OPTI-LOOP compensation, DC989B-A can be optimized to provide fast transient response.