LTC3718
PRODUCTIONLow Input Voltage, DC/DC Controller for DDR/QDR Memory Termination
- Part Models
- 2
- 1ku List Price
- Starting From $5.30
Overview
- Very Low VIN(MIN): 1.5V
- Ultrafast Transient Response
- True Current Mode Control
- 5V Drive for N-Channel MOSFETs Eliminates Auxillary 5V Supply
- No Sense Resistor Required
- Uses Standard 5V Logic-Level N-Channel MOSFETs
- VOUT(MIN): 0.4V
- VOUT Tracks 1/2 VIN or External VREF
- Symmetrical Source and Sink Output Current Limit
- Adjustable Switching Frequency
- tON(MIN) <100ns
- Power Good Output Voltage Monitor
- Programmable Soft-Start
- Output Overvoltage Protection
- Optional Short-Circuit Shutdown Timer
- Small 24-Lead SSOP Package
The LTC3718 is a high current, high efficiency synchronous switching regulator controller for DDR and QDR™ memory termination. It operates from an input as low as 1.5V and provides a regulated output voltage equal to (0.5)VIN. The controller uses a valley current control architecture to enable high frequency operation with very low on-times without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT. The LTC3718 uses a pair of standard 5V logic level N-channel external MOSFETs, eliminating the need for expensive P-channel or low threshold devices.
Forced continuous operation reduces noise and RF interference. Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and an optional short-circuit timer. Soft-start capability for supply sequencing can be accomplished using an external timing capacitor. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors.
Applications
- Bus Termination: DDR/QDR Memory, SSTL, HSTL,...
- Servers, RAID Systems
- Distributed Power Systems
- Synchronous Buck with General Purpose Boost
Documentation
Data Sheet 1
User Guide 1
Design Note 1
Technical Articles 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3718EG#PBF | 24-Lead SSOP | ||
| LTC3718EG#TRPBF | 24-Lead SSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 6, 2022 - 22_0171 Laser Top Mark Conversion for SSOP Packages Assembled in PNG |
||
| LTC3718EG#PBF | PRODUCTION | |
| LTC3718EG#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| Switching Regulators & Controllers 1 | ||
| LTM4632 | RECOMMENDED FOR NEW DESIGNS | Ultrathin, Triple Output, Step-Down μModule Regulator for DDR-QDR4 Memory |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3718
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.
Evaluation Kits
LTC3718EG | Low Input Voltage, High Current, DDR Termination Supply, 1.5-5VIN, VREF/2 @ 0-12a
Resources
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