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Overview
Features and Benefits
- 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
Product Details
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
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation
Reliability Data (1)
Evaluation Kit Manuals (2)
Tools & Simulations
LTspice
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.
Models for the following parts are available in LTspice:
Reference Materials
Rarely Asked Questions (1)
Technical Articles (2)
Design Resources
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.
PCN-PDN Information
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
