LTC3822
PRODUCTIONNo RSENSE™, Low Input Voltage, Synchronous Step-Down DC/DC Controller
- Part Models
- 4
- 1ku List Price
- Starting From $2.39
Overview
- No Current Sense Resistor Required
- All N-Channel MOSFET Synchronous Drive
- High Current Outputs Possible
- Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
- VIN: 2.75V to 4.5V
- ±1% 0.6V Reference
- Low Dropout Operation: 99% Duty Cycle
- Selectable Frequency (300kHz/550kHz/750kHz)
- Internal Soft-Start Circuitry
- Selectable Maximum Peak Current Sense Threshold
- Digital RUN Control Pin
- Output Overvoltage Protection
- Micropower Shutdown: IQ = 7.5µA
- Tiny Thermally Enhanced Leadless (3mm × 3mm) DFN or 10-Lead MSOP Package
The LTC3822 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.
A maximum duty cycle of 99% provides low dropout operation. The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors.
The LTC3822 is available in thermally enhanced DFN and 10-lead MSOP packages.
| Features | |
| LTC3822 | Internal soft-start, 340μA in sleep mode |
| LTC3822-1 | External soft start, selectable pulse skip/Burst Mode operation, tracking, phase lockable, power good (SSOP-16 package only), 105μA in sleep mode |
Applications
- 3.3VIN Systems
- Li-Ion Battery Systems
Documentation
Data Sheet 1
User Guide 2
Technical Articles 1
Rarely Asked Question 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#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3822EDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3822EMSE#PBF | 10-Lead MSOP w/ EP | ||
| LTC3822EMSE#TRPBF | 10-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC3822EMSE#PBF | PRODUCTION | |
| LTC3822EMSE#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
| 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 |
| 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:
- 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.
