LTC3822-1
PRODUCTIONNo RSENSE™, Low Input Voltage, Synchronous Step-Down DC/DC Controller
- Part Models
- 4
- 1ku List Price
- Starting From $2.70
Overview
- Dual N-Channel MOSFET Synchronous Drive
- No Current Sense Resistor Required
- Optimized for 3.3VIN 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: IQ = 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 VDS 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
- 3.3VIN Systems
Documentation
Data Sheet 1
User Guide 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 |
|---|---|---|---|
| LTC3822EDD-1#PBF | 12-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3822EDD-1#TRPBF | 12-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3822EGN-1#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3822EGN-1#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LTC3822EGN-1#PBF | PRODUCTION | |
| LTC3822EGN-1#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package |
||
| LTC3822EGN-1#PBF | PRODUCTION | |
| LTC3822EGN-1#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG] |
||
| LTC3822EGN-1#PBF | PRODUCTION | |
| LTC3822EGN-1#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
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| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| 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 2
- LTC3822-1 Demo Circuit - No Rsense, Low Input Voltage, Synchronous Step-down Converter (3.3V to 1.8V @ 10A)
- LTC3822-1 - Step-Down (Buck) Regulators
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.
Evaluation Kits
LTC3822EDD-1 Demo Board
Resources
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