DDR Termination Regulator


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The RT9040 is a sink/source tracking termination regulator. It is specifically designed for low-cost and low-external component count systems. The RT9040 possesses a high speed operating amplifier that provides fast load transient response and only requires a minimum 20μF of ceramic output capacitance. The RT9040 supports remote sensing functions and all features required to power the DDRI / DDRII / DDRIII and Low Power DDRIII VTT bus termination according to the JEDEC specification. In addition, the RT9040 provides an open drain PGOOD signal to monitor the output regulation and an EN signal that can be used to discharge VTT during S3 (suspend to RAM) for DDR applications .

The RT9040 is available in the thermal efficient WDFN-10L 3x3 package.


  • Notebook/Desktop/Server
  • Telecom/Datacom, GSM Base Station, LCD-TV/PDP-TV, Copier/Printer, Set-Top Box
  • LCD TV
Key Spec.
Status Active
Memory Supported DDRI;DDRII;DDRIII
Vin (min) (V) 1.1
Vin (max) (V) 3.5
VTT Output Tolerance (max) (+/- mV) 10
Isource/Isink (max) (A) 5
Standby Current (typ) (mA) 0.065
Current Limit (typ) (A) 3.5
Features Enable Input;OCP;Power Good
Package Type WDFN3x3-10
  • VIN Input Voltage Range : 1.1V to 3.5V
  • VCNTL Input Voltage Range : 2.375V to 5.5V
  • MLCC Stable
  • PGOOD to Monitor Output Regulation
  • ±10mA Reference (REFOUT)
  • Meet DDRI, DDRII JEDEC Spec Supports DDRIII, Low Power DDRIII VTT Application
  • Soft Start Function UVLO and OCP
  • UVLO and OCP Protection
  • Thermal Shutdown
  • RoHS Compliant and Halogen Free
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DDR Termination Regulator2009/04/30
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DDR Termination Regulator 2015/05/19
Technical Documents
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Richtek Selection Guide [Oct., 2020]2020/12/30