Features and Benefits
- 5-Bit Programmable Output Voltage: 1.05V to 1.825V (VRM8.5)
- No Sense Resistor Required
- 2% to 87% Duty Cycle at 200kHz
- tON(MIN) ≤ 100ns
- Supports Active Voltage Positioning
- True Current Mode Control
- 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
- Forced Continuous Control Pin
- Programmable Soft-Start
- Output Overvoltage Protection
- Optional Short-Circuit Shutdown Timer
- Micropower Shutdown: IQ < 30µA
- Available in 28-Lead Narrow SSOP Package
The LTC3720 is a synchronous step-down switching regulator controller for CPU power. An output voltage between 1.05V and 1.825V is selected by a 5-bit code (Intel VRM8.5 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 also user programmable. Wide supply range allows operation from 4V to 36V at the input.
- Power Supplies for Pentium® Processors
- Notebook Computers and Servers
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.
Evaluation Kits (1)
Documentation & Resources
R384 Reliability Data3/26/2018
DC483A - Demo Manual9/24/2009
VRM8.5 Design with the LTC3720 Achieves Small Size and Fast Transient Response8/1/2002 LT Journal
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTC3720 Companion Parts
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|
|LTC3720EGN#PBF||Material Declaration||Reliability Data||28-Lead SSOP (Narrow 0.15 Inch)|
|LTC3720EGN#TRPBF||Material Declaration||Reliability Data||28-Lead SSOP (Narrow 0.15 Inch)|
|Wafer Fabrication Data||R384 Reliability Data|
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.