MIC5167 1MHz, 6A, Integrated Switch, High-Efficiency, Synchronous Buck DDR Memory Terminator General Description Features The MIC5167 is a high-efficiency, 6A, integrated switch, Input voltage range: 2.6V to 5.5V synchronous regulator designed for use as a double data V voltage adjustable down to 0.35V TT rate (DDR) or quad data rate (QDR) terminator. The Output load current up to 6A MIC5167 is optimized for highest efficiency, achieving Power-Good (PG) fault flag more than 94% efficiency while still switching at 1MHz Efficiency > 94% across a broad load range over a broad range. The device works with a small 0.4H inductor and 300F output capacitor. The MIC5167 offers Ultra-fast transient response a simple, low-cost, JEDEC-compliant solution for Easy RC compensation terminating high-speed, low-voltage, digital buses (i.e. 100% maximum duty cycle DDR, DDR2, DDR3, DDR3L, DDR3UL, DDR4, SCSI, GTL, Fully-integrated MOSFET switches SSTL, HSTL, LV-TTL, LV-PECL, and LV ECL) with a Micropower shutdown Power-Good (PG) output. Thermal-shutdown and current-limit protection The output voltage is controlled externally by input to the 24-pin 4mm x 4mm MLF VDDQ pin. The output voltage is one-half the voltage applied to the VDDQ pin. The output voltage can be 40 C to +125 C junction temperature range adjusted down to 0.6V to address low-voltage power needs. The MIC5167 will source 6A and sink up to 6A. Applications A window comparator monitors the output voltage and Double data rate (DDR) or quad data rate (QDR) controls the PG output. If the output voltage is outside memory terminator 15% limit of VREF the PG is driven low. High power density point-of-load conversion The MIC5167 is available in a 24-pin 4mm x 4mm MLF Servers and routers with a junction operating range from 40 C to +125C. DVD recorders / Blu-ray players Data sheets and support documentation can be found on Micrels web site at: www.micrel.com. Computing peripherals Base stations FPGAs, DSP, and low-voltage ASIC power Typical Application MIC5167 6A Synchronous Buck DDR Terminator Ramp Control is a trademark of Micrel, Inc. MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC5167 Ordering Information Part Number Voltage Junction Temperature Range Package Lead Finish MIC5167YML Adjustable 40C to +125C 24-Pin 4x4 MLF Pb-Free Note: MLF is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration 24-Pin 4mm x 4mm MLF (ML) Pin Description Pin Number Pin Name Description Power Supply Voltage (Input): The PVIN pins are the input supply to the internal P-Channel 1, 6, 13, 18 PVIN Power MOSFET. A 22F ceramic is recommended for bypassing at each PVIN pin. The SVIN pin must be connected to the PVIN pin. Enable/Delay (Input): This pin is internally fed with a 1A current source from SVIN. A delayed turn on is implemented by adding a capacitor to this pin. The delay is proportional to the capacitor 2 EN/DLY value. The internal circuits are held off until EN/DLY reaches the enable threshold of 1.24V. This pin is pulled low when the input voltage is lower than the UVLO threshold. VDDQ (Input): VDDQ is connected to an internal precession divider which provides the reference 3 VDDQ voltage (VREF). VTT Reference (Output): This output provides an output of the internal reference voltage 4 VREF VDDQ/2. Connect a 100pF capacitor to ground at this pin. PG (Output): This is an open drain output that indicates when the output voltage is within 15% 5 PG of its nominal voltage. The PG flag is asserted without delay when the enable is set low or when the output goes outside 15% the window threshold. 14 FB Feedback (Input): Input to the error amplifier. Compensation pin (Input): The MIC5167 uses an internal compensation network containing a fixed-frequency zero (phase lead response) and pole (phase lag response) which allows the 15 COMP external compensation network to be much simplified for stability. The addition of a single capacitor and resistor to the COMP pin will add the necessary pole and zero for voltage mode loop stability using low value, low-ESR ceramic capacitors. 16 SGND Signal Ground: Internal signal ground for all low power circuits. M9999-012312-B January 2012 2