Features and Benefits
- VOUT = 1/2 VIN (Supply Splitter)
- Adjustable and Symmetrical Sink/Source Current Limit up to 20A
- ±0.65% Output Voltage Accuracy
- Up to 97% Efficiency
- No Sense Resistor Required
- Ultrafast Transient Response
- True Current Mode Control
- 2% to 90% Duty Cycle at 200kHz
- tON(MIN) ≤ 100ns
- Stable with Ceramic COUT
- Dual N-Channel MOSFET Synchronous Drive
- Power Good Output Voltage Monitor
- Wide VCC Range: 4V to 36V
- Adjustable Switching Frequency up to 1.5MHz
- Output Overvoltage Protection
- Optional Short-Circuit Shutdown Timer
- Available in a 16-Pin Narrow SSOP Package
The LTC3717 is a synchronous step-down switching regulator controller for double data rate (DDR) and Quad Data Rate™ (QDR™) memory termination. 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.
Forced continuous operation reduces noise and RF interference. Output voltage is internally set to half of VREF, which is user programmable.
Fault protection is provided by 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 symmetrical and user programmable. Wide supply range allows operation from 4V to 36V at the VCC input.
- Bus Termination: DDR and QDR Memory, SSTL, HSTL, ...
- Notebook Computers, Desktop Servers
- Tracking Power Supply
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)
DC450A: Demo Board for LTC3717 Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination.
Documentation & Resources
R384 Reliability Data3/26/201818 K
DC450A - Demo Manual9/24/2009491K
High Efficiency DDR Termination Power Supplies Source and Sink More than 10 Amps3/1/2002 LT Journal
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LTC3717EGN#PBF||Material Declaration||Reliability Data||16-Lead SSOP (Narrow 0.15 Inch)|
|LTC3717EGN#TRPBF||Material Declaration||Reliability Data||16-Lead SSOP (Narrow 0.15 Inch)|
|Wafer Fabrication Data||R384 Reliability Data|
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