MIC5191

Ultra High-Speed, High-Current

Active Filter / LDO Controller

PowerPAK is a trademark of Siliconix, Inc.

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

December 2006

1

M9999-122206

General Description

The MIC5191 is an ultra high-speed linear regulator. It

uses an external N-Channel FET as its power device.

The MIC5191's ultra high-speed abilities can handle the

fast load demands of microprocessor cores, ASICs, and

other high-speed devices. Signal bandwidths of greater

than 500 kHz can be achieved with a minimum amount of

capacitance while at the same time keeping the output

voltage clean, regardless of load demand. A powerful

output driver delivers large MOSFETs into their linear

regions, achieving ultra-low dropout voltage.

of a large amount of capacitance.

MIC5191 (1.0V reference) is optimized for output voltages

of 1.0V and higher.

The MIC5191 is offered in 10-pin 3mm×3mm MLF

10-pin MSOP-10 packages and has an operating junction

temperature range of –40°C to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• +1.0% initial output tolerance

• Dropout down to 25mV@10A

• Filters out switching frequency noise on input

• Very high large signal bandwidth >500kHz

• PSRR >40dB at 500kHz

• Adjustable output voltage down to 1.0V

• Stable with any output capacitor

• Excellent line and load regulation specifications

• Logic controlled shutdown

• Current limit protection

• Available –40°C to +125°C junction temperature

Applications

• Distributed power supplies

• ASIC power supplies

• DSP, µP, and µC power supplies

___________________________________________________________________________________________________________

Typical Application

VIN

SGND

PGND

IS

IR3716S

OUT

VCC1

C3

0.01µF

C2

10µF

FB

GND

GND

VCC2

EN

COMP

MIC5191

R3

C1

0.01µF