LTC3801

PRODUCTION

Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT

Part Models: 4
1ku List Price: Starting From $2.63

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Overview

High Efficiency: Up to 94%
Very Low No-Load Quiescent Current: Only 16µA (LTC3801)
High Output Currents Easily Achieved
Internal Soft-Start
Wide V_IN Range: 2.4V to 9.8V
Low Dropout: 100% Duty Cycle
Constant Frequency 550kHz Operation
Burst Mode^® Operation for High Efficiency at Light Loads (LTC3801)
Burst Mode Operation Disabled for Lower Output Ripple at Light Loads (LTC3801B)
Output Voltage as Low as 0.8V
±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Only 6µA Supply Current in Shutdown (LTC3801)
Low Profile (1mm) SOT-23 Package

The LTC3801/LTC3801B are constant frequency current mode step-down DC/DC controllers in a low profile (1mm max) 6-lead SOT-23 (ThinSOT) package. The parts provide excellent AC and DC load and line regulation with ±1.5% output voltage accuracy. The LTC3801 consumes only 195µA of quiescent current in normal operation, dropping to 16µA under no-load conditions.

The LTC3801/LTC3801B incorporate an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.2V. The LTC3801 automatically switches into Burst Mode operation at light loads which enhances efficiency at low output current. In the LTC3801B, Burst Mode operation is disabled for lower output ripple at light loads.

To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor.

Applications

1- or 2-Cell Li-Ion Battery-Powered Applications
Wireless Devices
Portable Computers
Distributed Power Systems

Part Models: 4
1ku List Price: Starting From $2.63

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
LTC3801BES6#TRMPBF	6-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3801BES6#TRPBF	6-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3801ES6#TRMPBF	6-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3801ES6#TRPBF	6-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Supervisory Circuits & Reset ICs 1
LTC2935	PRODUCTION	Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
Switching Regulators & Controllers 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3801
LTC3801B

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.