LTC3711
5-Bit Adjustable, Wide Operating Range, No RSENSE™ Step-Down Controller
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Overview
Features and Benefits
- 5-Bit Programmable Output Voltage: 0.925V to 2V
- No Sense Resistor Required
- True Current Mode Control
- 2% to 90% Duty Cycle at 200kHz
- tON(MIN) < 100ns
- Supports Active Voltage Positioning
- Extremely Fast Transient Response
- Stable with Ceramic COUT
- Dual N-Channel MOSFET Synchronous Drive
- Power Good Output Voltage Monitor
- Wide VIN Range: 4V to 36V
- ±1% 0.8V Reference
- Adjustable Current Limit
- Adjustable Switching Frequency
- Programmable Soft-Start
- Output Overvoltage Protection
- Optional Short-Circuit Shutdown Timer
- Micropower Shutdown: IQ < 30µA
- Available in 24-Lead Narrow SSOP Package
Product Details
The LTC3711 is a synchronous step-down switching regulator controller for CPU power. An output voltage between 0.925V and 2.000V is selected by a 5-bit code (Intel mobile VID specification). The controller uses a 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 operation when the main output is lightly loaded.
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.
Applications
- Power Supplies for Mobile Pentium® Processors
- Notebook and Palmtop Computers, PDAs
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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R384 Reliability Data3/26/2018
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New No RSENSE Controllers Deliver Very Low Output Voltages2/1/2001 LT Journal
Tools & Simulations
LTspice
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Models for the following parts are available in LTspice:
LTC3711
Product Recommendations
LTC3711 Companion Parts
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC3711EGN#PBF | Material Declaration | Reliability Data | 24-Lead SSOP (Narrow 0.15 Inch) | |
| LTC3711EGN#TRPBF | Material Declaration | Reliability Data | 24-Lead SSOP (Narrow 0.15 Inch) | |
| Wafer Fabrication Data | R384 Reliability Data |
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