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LTC3823
Fast No RSENSE™ Step-Down Synchronous DC/DC Controller with Differential Output Sensing, Tracking and PLL
Overview
Features and Benefits
- Wide VIN Range: 4.5V to 36V
- ±0.67%, 0.6V Reference Voltage
- Output Voltage Tracking Capability
- True Remote Sensing Differential Amplifier
- Sense Resistor Optional
- True Current Mode Control
- 2% to 90% Duty Cycle at 200kHz
- tON(MIN) < 100ns
- Phase-Locked Loop Frequency Synchronization
- Powerful Dual N-Channel MOSFET Driver
- Adjustable Cycle-by-Cycle Current Limit
- Adjustable Switching Frequency
- Programmable Soft-Start
- Current Foldback Protection (Disabled at Start-Up)
- Output Overvoltage Protection
- Micropower Shutdown: 30μA
- Power Good Output Voltage Monitor Tracks the Reference Input Pin
- Available in (5mm × 5mm) 32-Lead QFN and 28-Lead SSOP Narrow Packages
Product Details
The LTC3823 is a synchronous step-down switching regulator controller with true remote differential output sensing and output voltage up/down tracking capability. Its advanced functions and high accuracy reference are ideal for powering high performance server, ASIC and computer memory systems.
The LTC3823 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. The operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-locked loop allows the IC to be synchronized to an external clock.
Fault protection is provided by an overvoltage comparator and input undervoltage lockout. The regulator current limit is user programmable. A wide supply range allows voltages as high as 36V to be stepped down to as low as a 0.6V output. When using remote sense, output voltages up to 3.3V can be developed, and up to 90% of VIN without remote sense. Power supply sequencing is accomplished using an external soft-start timing capacitor.
Applications
- Distributed Power Systems
- Server Power Supplies
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 (1)
Documentation
Reliability Data (1)
Evaluation Kit Manuals (1)
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
Reference Materials
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.
Support & Discussions
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.
