LT3800
PRODUCTIONHigh-Voltage Synchronous Current Mode Step-Down Controller
- Part Models
- 4
- 1ku List Price
- Starting From $5.25
Overview
- 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.
Applications
- 12V and 42V Automotive and Heavy Equipment
- 48V Telecom Power Supplies
- Avionics and Industrial Control Systems
- Distributed Power Converters
Documentation
Data Sheet 1
User Guide 1
Design Note 1
Technical Articles 1
Press Release 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3800EFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3800EFE#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT3800IFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3800IFE#TRPBF | 16-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3800EFE#PBF | PRODUCTION | |
| LT3800EFE#TRPBF | PRODUCTION | |
| LT3800IFE#PBF | PRODUCTION | |
| LT3800IFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3800EFE#PBF | PRODUCTION | |
| LT3800EFE#TRPBF | PRODUCTION | |
| LT3800IFE#PBF | PRODUCTION | |
| LT3800IFE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
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| Switching Regulators & Controllers 1 | ||
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3800
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.
Evaluation Kits
LT3800EFE Demo Board | VIN = 20V to 55V, VOUT = 12V @ 6.25A