LTC3876 - Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and ±50mA VTT Reference
Features
- Complete DDR Power Solution with VTT Reference
- Wide VIN Range: 4.5V to 38V, VDDQ: 1V to 2.5V
- ±0.67% VDDQ Output Voltage Accuracy
- VDDQ and VTT Termination Controllers
- ±1.2% ±50mA Linear VTTR Reference Output
- Controlled On-Time, Valley Current Mode Control
- Frequency Programmable from 200kHz to 2MHz
- Synchronizable to External Clock
- tON(MIN) = 30ns, tOFF(MIN) = 90ns
- RSENSE or Inductor DCR Current Sensing
- Power Good Output Voltage Monitor
- Overvoltage Protection and Current Limit Foldback
- Thermally Enhanced 38-Pin (5mm × 7mm) QFN and TSSOP Packages
Typical Application
Description
The LTC®3876 is a complete DDR power solution, compatible with DDR1, DDR2, DDR3 and future DDRX lower voltage standards. The LTC3876 includes VDDQ and VTT DC/DC controllers and a precision linear VTT reference. A differential output sense amplifier and precision internal reference combine to offer an accurate VDDQ supply. The VTT controller tracks the precision VTTR linear reference with less than 20mV total DC error. The precision VTTR reference maintains 1.2% regulation accuracy tracking onehalf VDDQ over temperature for a ±50mA reference load.
The LTC3876 allows operation from 4.5V to 38V maximum at the input. The VDDQ output can range from 1.0V to 2.5V, with a corresponding VTT and VTTR output range of 0.5V to 1.25V. Voltage tracking soft-start, PGOOD and fault protection features are provided.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
QFN-38, TSSOP-38
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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 | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC3876EFE#PBF | TSSOP | 38 | E | $4.54 | $3.18 | View |
| LTC3876EFE#TRPBF | TSSOP | 38 | E | $3.24 | View | |
| LTC3876EUHF#PBF | QFN | 38 | E | $4.20 | $2.94 | View |
| LTC3876EUHF#TRPBF | QFN | 38 | E | $3.00 | View | |
| LTC3876IFE#PBF | TSSOP | 38 | I | $5.22 | $3.65 | View |
| LTC3876IFE#TRPBF | TSSOP | 38 | I | $3.71 | View | |
| LTC3876IUHF#PBF | QFN | 38 | I | $4.79 | $3.35 | View |
| LTC3876IUHF#TRPBF | QFN | 38 | I | $3.41 | View | |
| 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 |
|---|---|---|---|
| DC1631A | LTC3876EUHF Demo Board (DDR2/3) VIN = 4.5V to 14V, VDDQ = 1.8V/1.5V @ 20A, VTT = 0.9V/0.75V @ 10A | Contact Factory | |
| Buy Now | |||
Applications
- Motherboard Memory
- Servers
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LTC3876
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.