MIC5164 Dual Regulator Controller for DDR3 GDDR3/4/5 Memory and High-Speed Bus Termination General Description Features The MIC5164 is a dual regulator controller designed for Input voltage range: 1.35V to 6V high speed bus termination. It offers a simple, low-cost Up to 7A V Current TT JEDEC-compliant solution for terminating high-speed, low- Tracking programmable output voltage digital buses (i.e. DDR, DDR2, DDR3, SCSI, GTL, Power Good (PG) signal SSTL, HSTL, LV-TTL, Rambus, LV-PECL, LV-ECL, etc) with a Power Good (PG) signal. Wide bandwidth Logic controlled enable input The MIC5164 controls two external N-Channel MOSFETs to form two separate regulators. It operates by switching Requires minimal external components between either the high-side MOSFET or the low-side DDR, DDR2, DDR3, memory termination MOSFET depending on whether the current is being 40C < T < +125C J sourced to the load or sunk by the regulator. JEDEC-compliant bus termination for SCSI, GTL, SSTL, Designed to provide a universal solution for bus HSTL, LV-TTL, Rambus, LV-PECL, LV-ECL, etc termination regardless of input voltage, output voltage, or Tiny MSOP-10 package load current, the desired MIC5164 output voltage can be programmed by forcing the reference voltage externally to the desired voltage. Applications The MIC5164 operates from an input of 1.35V to 6V, with Desktop computers a second bias supply input required for operation. It is available in the tiny MSOP-10 package with an operating Notebook computers junction temperature range of 40 C to +125 C. Communication systems Data sheets and support documentation can be found on Video cards Micrels web site at: www.micrel.com. DDR/DDR2/DDR3 memory termination Typical Application Typical SSTL-2 Application (Two MOSFETs Support a 3.5A Application) Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC5164 Ordering Information Part Number Temperature Range Package Lead Finish MIC5164YMM 40 to +125C 10-Pin MSOP Pb-Free Note: MSOP is a Green RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration 10-Pin MSOP (MM) Pin Description Pin Number Pin Name Pin Function 1 VCC Bias Supply (Input): Apply 3V-6V to this input for internal bias to the controller. Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown. The EN pin can 2 EN be tied directly to VDDQ or VCC for functionality. Do not float the EN pin. Floating this pin causes the enable to be in an undetermined state. 3 VDDQ Input Supply Voltage. 4 VREF Reference voltage equal to half of VDDQ. For internal use only. 5 GND Ground. 6 FB Feedback (Input): Input to the internal error amplifier. Compensation (Output): Connect a capacitor and resistor from COMP pin to FB pin for 7 COMP compensation of the internal control loop. 8 LD Low-side drive (Output): Connects to the Gate of the external low-side MOSFET. 9 HD High-side drive (Output): Connects to the Gate of the external high-side MOSFET. 10 PG Power Good (Output): Open drain output. M9999-061510 June 2010 2