LTC3780
PRODUCTIONHigh Efficiency, Synchronous, 4-Switch Buck-Boost Controller
- Part Models
- 10
- 1ku List Price
- Starting From $7.79
Overview
- Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
- Wide VIN Range: 4V to 36V Operation
- Synchronous Rectification: Up to 98% Efficiency
- Current Mode Control
- ±1% Output Voltage Accuracy: 0.8V < VOUT < 30V
- Phase-Lockable Fixed Frequency: 200kHz to 400kHz
- Power Good Output Voltage Monitor
- Internal LDO for MOSFET Supply
- Quad N-Channel MOSFET Synchronous Drive
- VOUT Disconnected from VIN During Shutdown
- Adjustable Soft-Start Current Ramping
- Foldback Output Current Limiting
- Selectable Low Current Modes
- Output Overvoltage Protection
- Available in 24-Lead SSOP and Exposed Pad (5mm × 5mm) 32-Lead QFN Packages
The LTC3780 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phase-lockable frequency of up to 400kHz. With a wide 4V to 30V (36V maximum) input and output range and seamless transfers between operating modes, the LTC3780 is ideal for automotive, telecom and battery-powered systems.
The operating mode of the controller is determined through the FCB pin. For boost operation, the FCB mode pin can select among Burst Mode® operation, discontinuous mode and forced continuous mode. During buck operation, the FCB mode pin can select among skip-cycle mode, discontinuous mode and forced continuous mode. Burst Mode operation and skip-cycle mode provide high efficiency operation at light loads while forced continuous mode and discontinuous mode operate at a constant frequency.
Fault protection is provided by an output overvoltage comparator and internal foldback current limiting. A power good output pin indicates when the output is within 7.5% of its designed set point.
Applications
- Automotive Systems
- Telecom Systems
- DC Power Distribution Systems
- High Power Battery-Operated Devices
- Industrial Control
Documentation
Data Sheet 1
User Guide 3
Application Note 1
Design Note 1
Technical Articles 2
Video 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 |
|---|---|---|---|
| LTC3780EG#PBF | 24-Lead SSOP | ||
| LTC3780EG#TRPBF | 24-Lead SSOP | ||
| LTC3780EUH#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3780EUH#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3780IG#PBF | 24-Lead SSOP | ||
| LTC3780IG#TRPBF | 24-Lead SSOP | ||
| LTC3780IUH#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3780IUH#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3780MPG#PBF | 24-Lead SSOP | ||
| LTC3780MPG#TRPBF | 24-Lead SSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 6, 2022 - 22_0171 Laser Top Mark Conversion for SSOP Packages Assembled in PNG |
||
| LTC3780EG#PBF | PRODUCTION | |
| LTC3780EG#TRPBF | PRODUCTION | |
| LTC3780IG#PBF | PRODUCTION | |
| LTC3780IG#TRPBF | PRODUCTION | |
| LTC3780MPG#PBF | PRODUCTION | |
| LTC3780MPG#TRPBF | PRODUCTION | |
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3780EUH#PBF | PRODUCTION | |
| LTC3780EUH#TRPBF | PRODUCTION | |
| LTC3780IUH#PBF | PRODUCTION | |
| LTC3780IUH#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Switching Regulators & Controllers 1 | ||
| LTM4607 | RECOMMENDED FOR NEW DESIGNS | 36VIN, 24VOUT High Efficiency Buck-Boost DC/DC µModule (Power Module) |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3789 | RECOMMENDED FOR NEW DESIGNS | High Efficiency, Synchronous, 4-Switch Buck-Boost Controller |
Tools & Simulations
LTspice 2
- LTC3780 / LTC4444 Demo Circuit - Synchronous Buck-Boost Controller using a N-Channel MOSFET Driver (8-48V to 12V @ 3A)
- LTC3780 Demo Circuit - High Efficiency, Synchronous, 4-Switch Buck-Boost DC/DC Converter (6-30V to 12V @ 5A)
Models for the following parts are available in LTspice:
- LTC3780
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LTC3780
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.
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.
