MIC5167_12 Datasheet, PDF (1/23 Pages) Micrel Semiconductor – 1MHz, 6A, Integrated Switch, High-Efficiency, Synchronous Buck DDR Memory Terminator

MIC5167
1MHz, 6A, Integrated Switch,
High-Efficiency, Synchronous Buck
DDR Memory Terminator
General Description
Features
The MIC5167 is a high-efficiency, 6A, integrated switch,
synchronous regulator designed for use as a double data
rate (DDR) or quad data rate (QDR) terminator. The
MIC5167 is optimized for highest efficiency, achieving
more than 94% efficiency while still switching at 1MHz
over a broad range. The device works with a small 0.4µH
inductor and 300µF output capacitor. The MIC5167 offers
a simple, low-cost, JEDEC-compliant solution for
terminating high-speed, low-voltage, digital buses (i.e.
DDR, DDR2, DDR3, DDR3L, DDR3UL, DDR4, SCSI, GTL,
SSTL, HSTL, LV-TTL, LV-PECL, and LV_ECL) with a
Power-Good (PG) output.
The output voltage is controlled externally by input to the
VDDQ pin. The output voltage is one-half the voltage
applied to the VDDQ pin. The output voltage can be
adjusted down to 0.6V to address low-voltage power
needs. The MIC5167 will source 6A and sink up to 6A.
A window comparator monitors the output voltage and
controls the PG output. If the output voltage is outside
±15% limit of VREF the PG is driven low.
The MIC5167 is available in a 24-pin 4mm x 4mm MLF^®
with a junction operating range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• Input voltage range: 2.6V to 5.5V
• V_TT voltage adjustable down to 0.35V
• Output load current up to ±6A
• Power-Good (PG) fault flag
• Efficiency > 94% across a broad load range
• Ultra-fast transient response
• Easy RC compensation
• 100% maximum duty cycle
• Fully-integrated MOSFET switches
• Micropower shutdown
• Thermal-shutdown and current-limit protection
• 24-pin 4mm x 4mm MLF^®
• –40°C to +125°C junction temperature range
Applications
• Double data rate (DDR) or quad data rate (QDR)
memory terminator
• High power density point-of-load conversion
• Servers and routers
• DVD recorders / Blu-ray players
• 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 [phone] • fax + 1 [phone] • http://www.micrel.com
January 2012
M9999-012312-B