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LTC3831
High Power Synchronous Switching Regulator Controller for DDR Memory Termination
Overview
Features and Benefits
- 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
Product Details
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% |
Applications
- DDR SDRAM Termination
- SSTL_2 Interface
- SSTL_3 Interface
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Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation
Reliability Data (1)
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Technical Articles (1)
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.