LTC3709 - Fast 2-Phase, No RSENSE Synchronous DC/DC Controller with Tracking/Sequencing
Features
- PolyPhaseTM Valley Current Mode Controller
- Synchronizable to an External Clock with PLL
- Coincident or Ratiometric Tracking
- Sense Resistor Optional
- 2% to 90% Duty Cycle at 200kHz
- tON(MIN) < 100ns
- True Remote Sensing Differential Amplifier
- High Efficiency at Both Light and Heavy Loads
- Power Good Output Voltage Monitor
- 0.6V ±1% Reference
- Adjustable Current Limit
- Programmable Soft-Start and Operating Frequency
- Output Overvoltage Protection
- Optional Short-Circuit Shutdown Timer
- 32-Lead (5mm × 5mm) QFN Package
Typical Application
Description
The LTC3709 is a single output, dual phase, synchronous step-down switching regulator. The controller uses a constant on-time, valley current control architecture to deliver very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-locked loop allows the LTC3709 to be synchronized to an external clock.
A TRACK pin is provided for tracking or sequencing the output voltage among several LTC3709 chips or an LTC3709 and other DC/DC regulators. Soft-start is accomplished using an external timing capacitor.
Fault protection is provided by an output overvoltage comparator and an optional short-circuit shutdown timer. The current limit level is user programmable. A wide supply range allows voltages as high as 31V to step down to 0.6V.
Protected by U.S. Patents, including 5481178, 6476589, 6144194, 5847554, 6177678, 6304066, 6580258, 6674274, 6462525, 6593724.
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 |
|---|---|---|---|---|---|
| LTC3709EG#PBF | SSOP-24 | G | E | 05-08-1640 (G24) | Yes |
| LTC3709EG#TRPBF | SSOP-24 | G | E | 05-08-1640 (G24) | Yes |
| LTC3709EUH#PBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LTC3709EUH#TRPBF | 5x5 QFN-32 | UH | E | 05-08-1693 | 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 | |
|---|---|---|---|---|---|---|
| LTC3709EG#PBF | SSOP-24 | E | $5.83 | $4.90 | Yes | |
| LTC3709EG#TRPBF | SSOP-24 | E | $5.00 | Yes | ||
| LTC3709EUH#PBF | 5x5 QFN-32 | E | $5.83 | $4.90 | Yes | |
| LTC3709EUH#TRPBF | 5x5 QFN-32 | E | $5.00 | 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 |
|---|---|---|---|
| DC793A | LTC3709EUH Single Output, Dual Phase Synchronous Buck Converter, 7V to 24Vin, 1.5Vout @ 30A | $150.00 | |
| Buy Now | |||
Applications
- Notebook Computers
- Power Supply for DSP, ASIC, Graphic Processors
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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:
LTC3709
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.
