Features and Benefits
- Wide 4V to 60V Input Voltage Range
- Output Voltages up to 36V
- Adaptive Nonoverlap Circuitry Prevents Switch Shoot-Through
- Reverse Inductor Current Inhibit for Discontinuous Operation Improves Efficiency with Light Loads
- Output Slew Rate Controlled Soft-Start with Auto-Reset
- 100µA No Load Quiescent Current
- Low 10µA Current Shutdown
- 1% Regulation Accuracy
- 200kHz Operating Frequency
- Standard Gate N-Channel Power MOSFETs
- Current Limit Unaffected by Duty Cycle
- Reverse Overcurrent Protection
- 16-Lead Thermally Enhanced TSSOP Package
The LT3800 is a 200kHz fixed frequency high voltage synchronous current mode step-down switching regulator controller. The IC drives standard gate N-channel power MOSFETs and can operate with input voltages from 4V to 60V. An onboard regulator provides IC power directly from VIN and provides for output-derived power to minimize VIN quiescent current. MOSFET drivers employ an internal dynamic bootstrap feature, maximizing gate-source "ON" voltages during normal operation for improved operating efficiencies. The LT3800 incorporates Burst Mode operation, which reduces no load quiescent current to under 100µA. Light load efficiencies are also improved through a reverse inductor current inhibit, allowing the controller to support discontinuous operation. Both Burst Mode operation and the reverse-current inhibit features can be disabled if desired. The LT3800 incorporates a programmable soft-start that directly controls the voltage slew rate of the converter output for reduced startup surge currents and overshoot errors. The LT3800 is available in a 16-lead thermally enhanced TSSOP package.
Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.
- 12V and 42V Automotive and Heavy Equipment
- 48V Telecom Power Supplies
- Avionics and Industrial Control Systems
- Distributed Power Converters
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)
Demonstration Circuit 720 is a 200kHz high voltage, synchronous current-mode DC/DC step-down converter featuring the LT3800. The board operates from a Vin range of 20V to 55V and outputs 12V @ 6.25A (75W).
Documentation & Resources
R468 Reliability Data3/23/201832 K
DC720A - Demo Manual9/24/2009442K
Tools & Simulations
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LT3800EFE#PBF||Material Declaration||Reliability Data||16-Lead TSSOP w/ EP|
|LT3800EFE#TRPBF||Material Declaration||Reliability Data||16-Lead TSSOP w/ EP|
|LT3800IFE#PBF||Material Declaration||Reliability Data||16-Lead TSSOP w/ EP|
|LT3800IFE#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.