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LTC3831-1

Features: · 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 Ef...

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SeekIC No. : 004402380 Detail

LTC3831-1: Features: · 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...

LTC3831-1 Data Sheet

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Part Number:
LTC3831-1
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

· 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: <10mA
· Overtemperature Protection
· Available in 16-Pin Narrow SSOP Package


Application

· DDR SDRAM Termination
· SSTL_2, SSTL_3 Interface
· HSTL Interface


Pinout

Connection Diagram


Specifications

Supply Voltage
VCC ............................................................................... 9V
PVCC1,2 .......................................................................14V
Input Voltage
IFB, IMAX ......................................................0.3V to 14V
R+, R, FB, SHDN, FREQSET ............. 0.3V to VCC + 0.3V
Junction Temperature (Note 9) .............................. 125°C
Operating Temperature Range (Note 4) ..40°C to 85°C
Storage Temperature Range ............. .. 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C


Description

The LTC®3831-1 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 device supply current drops to <10mA.




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