MIC5167

1MHz, 6A, Integrated Switch,

High-Efficiency, Synchronous Buck

DDR Memory 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 (

General Description

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.

Features

• Input voltage range: 2.6V to 5.5V

• 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

• –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

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Typical Application

MIC5167 ±6A Synchronous Buck DDR Terminator

January 2012

M9999-012312-B