LTC3714 - Intel Compatible, Wide Operating Range, Step-Down Controller with Internal Op Amp
Features
- True Current Mode with Ultrafast Transient Response
- Stable with Ceramic COUT
- tON(MIN) < 100ns for Operation from High Input Ranges
- Supports Active Voltage Positioning
- No Sense Resistor Required
- 5-Bit VID Programmable Output Voltage: 0.6V to 1.75V
- Dual N-Channel MOSFET Synchronous Drive
- Programmable Output Offsets
- Power Good Output Voltage Monitor
- Wide VIN Range: 4V to 36V
- ±1% 0.6V Reference
- Adjustable Frequency
- Programmable Soft-Start
- Output Overvoltage Protection
- Optional Short-Circuit Shutdown Timer
- Forced Continuous Control Pin
- Logic Controlled Micropower Shutdown: IQ ≤ 30μA
- Available in 0.209" Wide 28-Lead SSOP Package
Typical Application
Description
The LTC®3714 is a synchronous step-down switching regulator controller for CPU power. An output voltage between 0.6V and 1.75V is selected by a 5-bit code (Intel mobile VID specification). 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 VIN and VOUT.
Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference and can assist secondary winding regulation by disabling discontinuous mode when the main output is lightly loaded. Internal op amp allows programmable offsets to the output voltage during power saving modes.
Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit level is user programmable. Wide supply range allows operation from 4V to 36V at the input.
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 |
|---|---|---|---|---|---|
| LTC3714EG#PBF | SSOP-28 | G | E | 05-08-1640 (G28) | Yes |
| LTC3714EG#TRPBF | SSOP-28 | G | E | 05-08-1640 (G28) | 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 | |
|---|---|---|---|---|---|---|
| LTC3714EG#PBF | SSOP-28 | E | $3.61 | $3.05 | Yes | |
| LTC3714EG#TRPBF | SSOP-28 | E | $3.15 | 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 |
|---|---|---|---|
| DC371A | LTC3714EG | Intel's Notebook Processor Power Supply, 7.5V to 24V Input, 0.6V to 1.75Vout @ 20A | Contact Factory | |
| Buy Now | |||
Applications
- Power Supply for Mobile Pentium® Processors and Transmeta Processors
- Notebook and Portable Computers
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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:
LTC3714
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.
