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LT3433: High Voltage Step-Up/Step-Down DC/DC Converter Data Sheet8/22/2007PDF238K
Overview
Features and Benefits
- Automatic Step-Up and Step-Down Conversion
- Uses a Single Inductor
- Wide 4V to 60V Input Voltage Range
- VOUT from 3.3V to 20V
- Dual Internal 500mA Switches
- 100µA No-Load Quiescent Current
- Low Current Shutdown
- ±1% Output Voltage Accuracy
- 200kHz Operating Frequency
- Boosted Supply Pin to Saturate High Side Switch
- Frequency Foldback Protection
- Current Limit Foldback Protection
- Current Limit Unaffected by Duty Cycle
- 16-lead Thermally Enhanced TSSOP Package
Product Details
The LT3433 is a 200kHz fixed-frequency current mode switching regulator that provides both step-up and stepdown regulation using a single inductor. The IC operates over a 4V to 60V input voltage range making it suitable for use in various wide input voltage range applications such as automotive electronics that must withstand both load dump and cold crank conditions.
Internal control circuitry monitors system conditions and converts from single switch buck operation to dual switch bridged operation when required, seamlessly changing between step-down and step-up voltage conversion.
Optional Burst Mode® operation reduces no-load quiescent current to 100µA and maintains high efficiencies with light loads.
Current limit foldback and frequency foldback help prevent inductor current runaway during start-up. Programmable soft-start helps prevent output overshoot at start-up.
The LT3433 is available in a 16-lead thermally enhanced TSSOP package.
Applications
- 12V Automotive Systems
- Wall Adapter Powered Systems
- Battery Power Voltage Buffering
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 & Resources
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R468 Reliability Data3/23/2018PDF32 K
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DC527A - Demo Manual9/24/2009PDF582K
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High Input Voltage Monolithic Switcher Steps Up and Down Using Single Inductor12/1/2003 LT Journal
Tools & Simulations
LTspice
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Models for the following parts are available in LTspice:
LT3433
Reference Designs (1)
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 |
|---|---|---|---|---|
| LT3433EFE#PBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT3433EFE#TRPBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT3433IFE#PBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT3433IFE#TRPBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| Wafer Fabrication Data | R468 Reliability Data |
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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.