Products
LTC3777
RECOMMENDED FOR NEW DESIGNS150V VIN and VOUT Synchronous 4-Switch Buck-Boost Controller + Switching Bias Supply
- Part Models
- 2
- 1ku List Price
- Starting From $11.37
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Overview
- 4-Switch Current Mode Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
- Wide VIN Range: 4.5V to 150V
- Wide Output Voltage Range: 1.2V ≤ VOUT ≤ 150V
- Synchronous Rectification: Up to 99% Efficiency
- ±1% 1.2V Voltage Reference
- Input or Output Average Current Limit
- Integrated 12μA IQ, 150V, 85mA, Switching Bias for Optimal Thermal Performance
- Programmable 6V to 10V DRVCC Optimizes Efficiency
- No Top FET Refresh Noise in Boost or Buck Mode
- VOUT Disconnected from VIN During Shutdown
- Phase-Lockable Fixed Frequency (50kHz to 600kHz)
- No Reverse Current During Start-Up
- 150V Rated RUN Pin with Accurate Turn-On Threshold
- Thermally Enhanced 48-Lead e-LQFP Package
The LTC3777 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 600kHz, while an input/output constant current loop provides support for battery charging. The 150V integrated switching bias supply is a high efficiency step-down regulator that draws only 12μA typical DC supply current with a regulated output voltage at no load.
With a wide 4.5V to 150V input and output range and seamless transfers between operating regions, the LTC3777 is ideal for industrial, telecom and battery powered systems.
The LTC3777 features a power good output indicator and a MODE pin to select between pulse-skipping mode or forced continuous mode of operation. The PLLIN pin allows the IC to be synchronized to an external clock. The SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short circuit conditions.
Applications
- Industrial, Transportation, Medical, Military, Avionics
Documentation
Data Sheet 1
Product Selector Card 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 |
|---|---|---|---|
| LTC3777ELXE#PBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3777ILXE#PBF | 48-Lead LQFP (7mm x 7mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 6, 2021 - 21_0046 Transfer of LQFP and LQFP_EP from AEM to AET |
||
| LTC3777ELXE#PBF | PRODUCTION | |
| LTC3777ILXE#PBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Protection Switches & Controllers 1 | ||
| LTC4366 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3777
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LTC3777
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.
Evaluation Kits
LTC3777 High Voltage, High Efficiency 48V/10A Synchronous Buck-Boost Converter