LTC3822-1

PRODUCTION

No R_SENSE^™, Low Input Voltage, Synchronous Step-Down DC/DC Controller

Part Models: 4
1ku List Price: Starting From $2.13

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Part Details

Dual N-Channel MOSFET Synchronous Drive
No Current Sense Resistor Required
Optimized for 3.3V_IN and Li-Ion Applications
Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
±1% 0.6V Reference
Low Dropout Operation: 99% Duty Cycle
Phase-Lockable or Adjustable Frequency: 250kHz to 750kHz
Internal Soft-Start Circuitry
Tracking and Adjustable Soft-Start Input

Selectable Maximum Peak Current Sense Threshold
Selectable Burst Mode^®/Forced Continuous/Pulse Skipping Mode at Light Load
Digital RUN Control Pin
Output Overvoltage Protection
Micropower Shutdown: I_Q = 7.5µA
Tiny Thermally Enhanced 12-Pin (3mm × 3mm) DFN or 16-Pin Narrow SSOP Packages

The LTC3822-1 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET V_DS sensing eliminates the need for sense resistors and improves efficiency.

Burst Mode operation provides high efficiency at light loads. The 99% maximum duty cycle provides low dropout operation, extending operating time in battery-powered systems.

The operating frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3822-1 can be synchronized to an external clock from 250kHz to 750kHz.

The LTC3822-1 is available in the tiny footprint thermally enhanced 12-pin DFN package or 16-pin narrow SSOP package.


	Features
LTC3822	Internal soft-start, 34µA in sleep mode
LTC3822-1	External soft start, selectable pulse skip/Burst Mode operation, power good (SSOP-16 package only), 105µA in sleep mode

Applications

Single Cell Li-Ion Powered Systems
3.3V_IN Systems

Part Models: 4
1ku List Price: Starting From $2.13

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
LTC3822EDD-1#PBF	12-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3822EDD-1#TRPBF	12-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3822EGN-1#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3822EGN-1#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LTC3822EGN-1#PBF	PRODUCTION
LTC3822EGN-1#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package
		PCN22_0235_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3822EGN-1#PBF	PRODUCTION
LTC3822EGN-1#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG]
		PCN22_0066_Form Material_Report Delta Qualification Matrix
LTC3822EGN-1#PBF	PRODUCTION
LTC3822EGN-1#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

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Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Multiple Output Buck Regulators 1
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LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC3822
LTC3822-1

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.