LTC3831-1
PRODUCTIONHigh Power Synchronous Switching Regulator Controller for DDR Memory Termination
- Part Models
- 2
- 1ku List Price
- Starting From $4.87
Overview
- VOUT as Low as 0.4V
- High Power Switching Regulator Controller for DDR Memory Termination
- VOUT Tracks 1/2 of VIN or External VREF
- No Current Sense Resistor Required
- Low VCC Supply: 3V to 8V
- Maximum Duty Cycle > 91% Over Temperature
- Drives All N-Channel External MOSFETs
- High Efficiency: Up to 95%
- 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
The LTC3831-1 is a high power, high efficiency switching regulator controller designed for DDR memory termination. The LTC3831-1 generates an output voltage equal to 1/2 of an external supply or reference voltage. The LTC3831-1 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 LTC3831-1 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 300kHz free-running clock frequency can be externally adjusted or synchronized with an external signal from 100kHz to above 500kHz. In shutdown mode, the LTC3831-1 supply current drops to <10µA.
| Feedback Voltage | Accuracy Over Temp | |
| LTC3831 | 1.25V | 1.5% |
| LTC3831-1 | 0.75V | 1.6% |
Applications
- DDR SDRAM Termination
- SSTL_2, SSTL_3 Interface
- HSTL Interface
Documentation
Data Sheet 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 |
|---|---|---|---|
| LTC3831EGN-1#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3831EGN-1#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LTC3831EGN-1#PBF | PRODUCTION | |
| LTC3831EGN-1#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package |
||
| LTC3831EGN-1#PBF | PRODUCTION | |
| LTC3831EGN-1#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG] |
||
| LTC3831EGN-1#PBF | PRODUCTION | |
| LTC3831EGN-1#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
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| 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:
- LTC3831
- LTC3831-1
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.
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