LTC3876
RECOMMENDED FOR NEW DESIGNSDual DC/DC Controller for DDR Power with Differential VDDQ Sensing and ±50mA VTT Reference
- Part Models
- 8
- 1ku List Price
- Starting From $4.47
Overview
- 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
The LTC3876 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.
Applications
- Motherboard Memory
- Servers
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 |
|---|---|---|---|
| LTC3876EFE#PBF | 38-Lead TSSOP w/ EP | ||
| LTC3876EFE#TRPBF | 38-Lead TSSOP w/ EP | ||
| LTC3876EUHF#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LTC3876EUHF#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LTC3876IFE#PBF | 38-Lead TSSOP w/ EP | ||
| LTC3876IFE#TRPBF | 38-Lead TSSOP w/ EP | ||
| LTC3876IUHF#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LTC3876IUHF#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LTC3876EFE#PBF | PRODUCTION | |
| LTC3876EFE#TRPBF | PRODUCTION | |
| LTC3876EUHF#PBF | PRODUCTION | |
| LTC3876EUHF#TRPBF | PRODUCTION | |
| LTC3876IFE#PBF | PRODUCTION | |
| LTC3876IFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LTC3876EFE#PBF | PRODUCTION | |
| LTC3876EFE#TRPBF | PRODUCTION | |
| LTC3876IFE#PBF | PRODUCTION | |
| LTC3876IFE#TRPBF | PRODUCTION | |
|
Apr 9, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LTC3876IUHF#PBF | PRODUCTION | |
| LTC3876IUHF#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 |
|---|---|---|
| Oscillators 1 | ||
| LTC6908 | Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation | |
| Switching Regulators & Controllers 1 | ||
| LTM4632 | RECOMMENDED FOR NEW DESIGNS | Ultrathin, Triple Output, Step-Down μModule Regulator for DDR-QDR4 Memory |
| Temperature Sensors 2 | ||
| LTC2991 | RECOMMENDED FOR NEW DESIGNS | Octal I2C Voltage, Current, and Temperature Monitor |
| LTC2997 | PRODUCTION | Remote/Internal Temperature Sensor |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3876
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
LTC3876EUHF Demo Board | DDR2/3, VIN = 4.5V to 14V, VDDQ = 1.8V/1.5V @ 20A, VTT = 0.9V/0.75V @ ±10A