LTC3831

PRODUCTION

High Power Synchronous Switching Regulator Controller for DDR Memory Termination

Part Models: 4
1ku List Price: Starting From $3.49

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Part Details

High Power Switching Regulator Controller for DDR Memory Termination
V_OUT Tracks 1/2 of V_IN or External V_REF
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

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

Part Models: 4
1ku List Price: Starting From $3.49

Documentation

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#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3831EGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3831IGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3831IGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LTC3831EGN#PBF	PRODUCTION
LTC3831EGN#TRPBF	PRODUCTION
LTC3831IGN#PBF	PRODUCTION
LTC3831IGN#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package
		PCN22_0235_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3831EGN#PBF	PRODUCTION
LTC3831EGN#TRPBF	PRODUCTION
LTC3831IGN#PBF	PRODUCTION
LTC3831IGN#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG]
		PCN22_0066_Form Material_Report Delta Qualification Matrix
LTC3831EGN#PBF	PRODUCTION
LTC3831EGN#TRPBF	PRODUCTION
LTC3831IGN#PBF	PRODUCTION
LTC3831IGN#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
DDR/QDR Memory Bus Termination 1
LTM4632	RECOMMENDED FOR NEW DESIGNS	Ultrathin, Triple Output, Step-Down μModule Regulator for DDR-QDR4 Memory
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Silicon Oscillators 2
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

Tools & Simulations

LTspice 1

LTC3831 - Switching Regulators

Models for the following parts are available in LTspice:

LTC3831

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.