LTC3772

PRODUCTION

Micropower No R_SENSE Constant Frequency Step-Down DC/DC Controller

Part Models: 4
1ku List Price: Starting From $2.27

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Part Details

No Current Sense Resistor Required
40µA No-Load Quiescent Current
High Output Currents Easily Achieved
Internal Soft-Start Ramps V_OUT
Wide V_IN Range: 2.75V to 9.8V
Low Dropout: 100% Duty Cycle
Constant Frequency 550kHz Operation
Low Ripple Burst Mode^® Operation at Light Load
Output Voltage as Low as 0.8V
±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Only 8µA Supply Current in Shutdown
Low Profile 8-Lead SOT-23 (1mm) and (3mm × 2mm) DFN (0.75mm) Packages

The LTC3772 is a constant frequency current mode step-down DC/DC controller in a low profile 8-lead SOT-23 (ThinSOT^™) and a 3mm × 2mm DFN package. The No R_SENSE^™ architecture eliminates the need for a current sense resistor, improving efficiency and saving board space.

The LTC3772 automatically switches into Burst Mode operation at light loads to increase efficiency at low output current. It consumes only 40µA of quiescent current under a no-load condition.

The LTC3772 incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2V. To maximize the runtime from 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 and capacitors. An internal soft-start smoothly ramps the output voltage from zero to its regulation point.


	Burst Mode
LTC3772	Yes
LTC3772B	No

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 $2.27

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
LTC3772EDDB#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3772EDDB#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3772ETS8#TRMPBF	8-Lead SOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3772ETS8#TRPBF	8-Lead SOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC3772
LTC3772B

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

LTC3772EDDB Demo Board | VIN = 2.75V to 8V, VOUT = 1.8V/2.5V/3.3V @ 2A

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Product Details

Demonstration circuit 836 is a No R_SENSE^™ constant frequency step-down DC/DC converter featuring the LTC3772 Burst-Mode capable, nonsynchronous controller in a 3mm × 2mm DFN package. The demo board has an input voltage range of 2.75V to 8V and provides 2A at one of the three jumper-selectable output voltages: 1.8V, 2.5V or 3.3V.

Resources

DC836A - Schematic
26.00K

DC836A - Design File
439.00K

DC836A - Demo Manual
122.00K

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LTC3772

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Press Release 1