LTC3831 - High Power Synchronous Switching Regulator Controller for DDR Memory Termination
Features
- High Power Switching Regulator Controller for DDR Memory Termination
- VOUT Tracks 1/2 of VIN or External VREF
- No Current Sense Resistor Required
- Low Input Supply Voltage Range: 3V to 8V
- Maximum Duty Cycle >91% Over Temperature
- Drives All N-Channel External MOSFETs
- High Efficiency: Over 95% Possible
- Programmable Fixed Frequency Operation:
100kHz to 500kHz - External Clock Synchronization Operation
- Programmable Soft-Start
- Low Shutdown Current: <10µA
- Overtemperature Protection
- Available in 16-Pin Narrow SSOP Package
Typical Application
Description
The LTC3831 is a high power, high efficiency switching regulator controller designed for DDR memory termination. The LTC3831 generates an output voltage equal to 1/2 of an external supply or reference voltage. The LTC3831 uses a synchronous switching architecture with N-channel MOSFETs. Additionally, the chip senses output current through the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without a current sense resistor.
The LTC3831 operates with input supply voltage as low as 3V and with a maximum duty cycle of >91%. It includes a fixed frequency PWM oscillator for low output ripple operation. The 200kHz free-running clock frequency can be externally adjusted or synchronized with an external signal from 100kHz to above 500kHz. In shutdown mode, the LTC3831 supply current drops to <10µA.
| Feedback Voltage |
Accuracy Over Temp |
|
| LTC3831 | 1.25V | 1.5% |
| LTC3831-1 | 0.75V | 1.6% |
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 |
|---|---|---|---|---|---|
| LTC3831EGN#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC3831EGN#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC3831IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC3831IGN#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LTC3831EGN#PBF | SSOP-16 | E | $3.43 | $2.90 | Yes | |
| LTC3831EGN#TRPBF | SSOP-16 | E | $2.96 | Yes | ||
| LTC3831IGN#PBF | SSOP-16 | I | $5.29 | $3.70 | Yes | |
| LTC3831IGN#TRPBF | SSOP-16 | I | $3.76 | 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 |
|---|---|---|---|
| DC470A | LTC3831EGN | High Efficiency Termination/Tracking Power Supply, 3V~8Vin, VREF/2 @ 12A | Contact Factory | |
| Buy Now | |||
Applications
- DDR SDRAM Termination
- SSTL_2 Interface
- SSTL_3 Interface
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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:
LTC3831
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.
