LTC3784 - 60V PolyPhase Synchronous Boost Controller
Features
- PolyPhase® Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise
- Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation
- Wide VIN Range: 4.5V to 60V (65V Abs Max); Operates Down to 2.3V After Start-Up
- Output Voltage Up to 60V
- ±1% 1.200V Reference Voltage
- RSENSE or Inductor DCR Current Sensing
- 100% Duty Cycle Capability for Synchronous MOSFET
- Low Quiescent Current: 28μA
- Phase-Lockable Frequency (75kHz to 850kHz)
- Programmable Fixed Frequency (50kHz to 900kHz)
- Power Good Output Voltage Monitor
- Low Shutdown Current, IQ < 4μA
- Internal LDO Powers Gate Drive from VBIAS or EXTVCC
- Thermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3784 is a high performance PolyPhase® single output synchronous boost converter controller that drives two N-channel power MOSFET stages out-of-phase. Multiphase operation reduces input and output capacitor requirements and allows the use of smaller inductors than the single-phase equivalent. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements, simplifying high power boost applications.
A 4.5V to 60V input supply range encompasses a wide range of system architectures and battery chemistries. When biased from the output of the boost converter or another auxiliary supply, the LTC3784 can operate from an input supply as low as 2.3V after start-up. The operating frequency can be set within a 50kHz to 900kHz range or synchronized to an external clock using the internal PLL. PolyPhase operation allows the LTC3784 to be configured for 2-, 3-, 4-, 6- and 12-phase operation.
The SS pin ramps the output voltage during start-up. The PLLIN/MODE pin selects Burst Mode® operation, pulseskipping mode or forced continuous mode at light loads.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3784EGN#PBF | SSOP-28 | GN | E | 05-08-1641 (GN28) | Yes |
| LTC3784EGN#TRPBF | SSOP-28 | GN | E | 05-08-1641 (GN28) | Yes |
| LTC3784EUFD#PBF | 4x5 QFN-28 | UFD | E | 05-08-1712 | Yes |
| LTC3784EUFD#TRPBF | 4x5 QFN-28 | UFD | E | 05-08-1712 | Yes |
| LTC3784HGN#PBF | SSOP-28 | GN | H | 05-08-1641 (GN28) | Yes |
| LTC3784HGN#TRPBF | SSOP-28 | GN | H | 05-08-1641 (GN28) | Yes |
| LTC3784HUFD#PBF | 4x5 QFN-28 | UFD | H | 05-08-1712 | Yes |
| LTC3784HUFD#TRPBF | 4x5 QFN-28 | UFD | H | 05-08-1712 | Yes |
| LTC3784IGN#PBF | SSOP-28 | GN | I | 05-08-1641 (GN28) | Yes |
| LTC3784IGN#TRPBF | SSOP-28 | GN | I | 05-08-1641 (GN28) | Yes |
| LTC3784IUFD#PBF | 4x5 QFN-28 | UFD | I | 05-08-1712 | Yes |
| LTC3784IUFD#TRPBF | 4x5 QFN-28 | UFD | I | 05-08-1712 | Yes |
| LTC3784MPGN#PBF | SSOP-28 | GN | MP | 05-08-1641 (GN28) | Yes |
| LTC3784MPGN#TRPBF | SSOP-28 | GN | MP | 05-08-1641 (GN28) | Yes |
| LTC3784MPUFD#PBF | 4x5 QFN-28 | UFD | MP | 05-08-1712 | Yes |
| LTC3784MPUFD#TRPBF | 4x5 QFN-28 | UFD | MP | 05-08-1712 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3784EGN#PBF | SSOP-28 | E | $5.37 | $3.76 | Yes | |
| LTC3784EGN#TRPBF | SSOP-28 | E | $3.82 | Yes | ||
| LTC3784EUFD#PBF | 4x5 QFN-28 | E | $5.37 | $3.76 | Yes | |
| LTC3784EUFD#TRPBF | 4x5 QFN-28 | E | $3.82 | Yes | ||
| LTC3784HGN#PBF | SSOP-28 | H | $6.47 | $4.53 | Yes | |
| LTC3784HGN#TRPBF | SSOP-28 | H | $4.59 | Yes | ||
| LTC3784HUFD#PBF | 4x5 QFN-28 | H | $6.47 | $4.53 | Yes | |
| LTC3784HUFD#TRPBF | 4x5 QFN-28 | H | $4.59 | Yes | ||
| LTC3784IGN#PBF | SSOP-28 | I | $6.06 | $4.24 | Yes | |
| LTC3784IGN#TRPBF | SSOP-28 | I | $4.30 | Yes | ||
| LTC3784IUFD#PBF | 4x5 QFN-28 | I | $6.06 | $4.24 | Yes | |
| LTC3784IUFD#TRPBF | 4x5 QFN-28 | I | $4.30 | Yes | ||
| LTC3784MPGN#PBF | SSOP-28 | MP | $17.14 | $12.00 | Yes | |
| LTC3784MPGN#TRPBF | SSOP-28 | MP | $12.06 | Yes | ||
| LTC3784MPUFD#PBF | 4x5 QFN-28 | MP | $17.14 | $12.00 | Yes | |
| LTC3784MPUFD#TRPBF | 4x5 QFN-28 | MP | $12.06 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2061A | LTC3784IUFD Demo Board | 6V ≤ VIN ≤ 60V; VOUT= 48V @ 3A to 12A | $125.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3784HGN#PBF | SSOP-28 | H | $6.47 | $4.53 | Yes | |
| LTC3784HGN#TRPBF | SSOP-28 | H | $4.59 | Yes | ||
| LTC3784IGN#PBF | SSOP-28 | I | $6.06 | $4.24 | Yes | |
| LTC3784IGN#TRPBF | SSOP-28 | I | $4.30 | Yes | ||
| LTC3784MPGN#PBF | SSOP-28 | MP | $17.14 | $12.00 | Yes | |
| LTC3784MPGN#TRPBF | SSOP-28 | MP | $12.06 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Industrial
- Automotive
- Medical
- Military
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice:
LTC3784
LTpowerCAD
The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD
To open the project file for this circuit:
- Step 1: If you have not installed LTpowerCAD on this computer, download and install LTpowerCAD
- Step 2: Once LTpowerCAD is installed, click on the link(s) below to open the project file
- Step 3: If LTpowerCAD does not automatically open after clicking the link above, you can open the project file by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTpowerCAD and open the project file by selecting 'Open Project' from the 'File' menu
Design tools for the following parts are available in LTpowerCAD:
LTC3784
LTC3784 Parallel
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
