LTC3773 - Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking
Features
- Current Mode Controller with Onboard MOSFET Drivers
- Programmable Power Up/Down Tracking
- Wide VIN Range: 3.3V to 36V (VCC = 5V)
- ±1% 0.6V VFB Accuracy Over Temperature
- Power Good Output Voltage Monitor
- Phase-Lockable or Adjustable Frequency:
- 160kHz to 700kHz
- OPTI-LOOP® Compensation Minimizes COUT
- Current Foldback and Overvoltage Protection
- Selectable Continuous, Discontinuous or
- Burst Mode® Operation at Light Load
- Programmable Phase Operation
- Available in 5mm x 7mm QFN and 36-Lead
- SSOP Packages
Typical Application
Description
The LTC3773 is a high performance, 3-phase, triple output synchronous step-down switching regulator controller with output voltage power up/down tracking capability. The controller allows for sequential, coincident or ratiometric tracking.
This 3-phase controller drives its output stages with 120 degree phase separation at frequencies of up to 700kHz per phase minimizing the RMS input current. Light load efficiency can be maximized by using selectable Burst Mode operation. The 0.6V precision reference supports output voltages from 0.6V to 5V.
Fault protection features include output overvoltage, input undervoltage lockout plus current foldback under shortcircuit or overload conditions.
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 |
|---|---|---|---|---|---|
| LTC3773EG#PBF | SSOP-36 | G | E | 05-08-1640 (G36) | Yes |
| LTC3773EG#TRPBF | SSOP-36 | G | E | 05-08-1640 (G36) | Yes |
| LTC3773EUHF#PBF | 5x7 QFN-38 | UHF | E | 05-08-1701 | Yes |
| LTC3773EUHF#TRPBF | 5x7 QFN-38 | UHF | E | 05-08-1701 | 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 | |
|---|---|---|---|---|---|---|
| LTC3773EG#PBF | SSOP-36 | E | $5.64 | $3.95 | Yes | |
| LTC3773EG#TRPBF | SSOP-36 | E | $4.01 | Yes | ||
| LTC3773EUHF#PBF | 5x7 QFN-38 | E | $5.64 | $3.95 | Yes | |
| LTC3773EUHF#TRPBF | 5x7 QFN-38 | E | $4.01 | 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 |
|---|---|---|---|
| DC908A | LTC3773EG Demo Board | (SSOP) 3-Phase, 7V ≤ VIN ≤ 24V, Vout1 = 3.3V @ 15A, Vout2 = 2.5V @ 15A, Vout3 = 1.8V @ 15A | $150.00 | |
| DC913A | LTC3773EUHF Demo Board | (QFN) 3-Phase, 4.5V ≤ VIN ≤ 13.5V, Vout1 = 2.5V @ 15A, Vout2 = 1.8V @ 15A, Vout3 = 1.2V @ 15A | $150.00 | |
| Buy Now | |||
Applications
- Servers, Telecom, Industrial Power Supplies
- General Purpose Multiple Rail DC/DC
- FPGA and DSP Requirements
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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
Models for the following parts are available in LTspice:
LTC3773
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.
