MIC5165 Dual Regulator Controller for DDR3 GDDR3/4/5 Memory Termination General Description Features The MIC5165 is a dual regulator controller designed Input voltage range: 0.75V to 6V specifically for low-voltage memory termination Up to 7A V Current TT applications such as DDR3 and GDDR3/4/5. The MIC5165 Tracking programmable output offers a simple, low-cost JEDEC-compliant solution for Power Good signal terminating high-speed, low-voltage digital buses with a Power Good (PG) signal. Wide bandwidth The MIC5165 controls two external N-Channel MOSFETs Logic-controlled enable input to form two separate regulators. It operates by switching Requires minimal external components between either the high-side MOSFET or the low-side DDR3, GDDR3/4/5 memory termination MOSFET, depending on whether the current is being -40C < T < +125C J sourced to the load or being sunk by the regulator. Tiny MSOP-10 package Designed to provide a universal solution for memory termination regardless of input voltage, output voltage, or load current, the desired MIC5165 output voltage can be Applications programmed by forcing the reference voltage externally to Desktop Computers the desired voltage. Servers The MIC5165 operates from an input voltage as low as 0.75V up to 6V, with a second bias supply input required Notebook computers for operation. The MIC5165 is available in a tiny MSOP-10 Workstations package with an operating junction temperature range of DDR3 andGDDR3/4/5 Memory Termination 40C to +125C. Data sheets and support documentation can be found on Micrels web site at: www.micrel.com. Typical Application MIC5165 as a DDR3 Memory Termination Device for 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. MIC5165 Ordering Information Part Number Temperature Range Package Lead Finish MIC5165YMM 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. 2 EN The EN pin can 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 7 COMP for 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-B June 2010 2