LTC3833
Fast Accurate Step-Down DC/DC Controller with Differential Output Sensing
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Overview
Features and Benefits
- Wide VIN Range: 4.5V to 38V
- VOUT Range: 0.6V to 5.5V
- Output Accuracy: ±0.25% at 25°C and ±0.67% over Temperature
- Differential Output Sensing Allowing Up to 500mV Line Loss
- Fast Load Transient Response
- tON(MIN) = 20ns, tOFF(MIN) = 90ns
- Controlled On-Time Valley Current Mode Architecture
- Frequency Programmable from 200kHz to 2MHz and Synchronizable to External Clock
- RSENSE or Inductor DCR Current Sensing
- Overvoltage Protection and Current Limit Foldback
- Power Good Output Voltage Monitor
- Output Tracking or Adjustable Soft-Start
- External VCC Input for Bypassing Internal LDO
- 20-Pin QFN (3mm × 4mm) and TSSOP Packages
Product Details
The LTC3833 is a synchronous step-down DC/DC switching regulator controller targeted for high power applications. It drives all N-channel power MOSFETs. The controlled on-time valley current mode architecture allows for both fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUT and load current.
Differential output voltage sensing along with a precision internal reference combine to offer ±0.67% output regulation and the ability to correct for up to ±500mV variations in the output terminals due to line losses. The operating frequency can be programmed from 200kHz to 2MHz with an external resistor and can be synchronized to an external clock for noise and EMI sensitive applications.
Very low tON and tOFF times allow for near 0% and near 100% duty cycles, respectively. Programmable soft-start or output voltage tracking is available. Safety features include output overvoltage protection, programmable current limit with foldback, and a power good output signal.
Applications
- Distributed Power Systems
- Point-of-Load Converters
- Computing Systems
- Datacomm Systems
Product Categories
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (4)
Documentation & Resources
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R526 Reliability Data3/26/2018PDF365 K
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DC1516A - Demo Manual8/9/2011PDF200K
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DC1640A - Demo Manual6/8/2011PDF767K
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Constant On-Time High Step-Down Controllers7/15/2011PDF1M
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Dual, Fast, Step-Down Controller’s External Reference Input Enables Dynamic Voltage Scaling from 0.4V to 5.5V and 0.3% Total Combined Regulation Accuracy4/1/2013 LT Journal
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2MHz Dual DC/DC Controller Halves Settling Time of Load Release Transients, Features 0.67% Differential VOUT Accuracy and Is Primed for High Step-Down Ratios4/1/2012 LT Journal
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Fast, Accurate Step-Down DC/DC Controller Converts 24V Directly to 1.8V at 2MHz10/1/2011 LT Journal
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:
LTC3833
LTpowerCAD
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
LTpowerCAD Project Files
Design tools for the following parts are available in LTpowerCAD:
LTC3833
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.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC3833EFE#PBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LTC3833EFE#TRPBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LTC3833EUDC#PBF | Material Declaration | Reliability Data | 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | |
| LTC3833EUDC#TRPBF | Material Declaration | Reliability Data | 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | |
| LTC3833IFE#PBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LTC3833IFE#TRPBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LTC3833IUDC#PBF | Material Declaration | Reliability Data | 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | |
| LTC3833IUDC#TRPBF | Material Declaration | Reliability Data | 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R526 Reliability Data |
PCN-PDN Information
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Support & Discussions
Sample & Buy
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.