Micrel, Inc.

MIC5167

January 2012

2

M9999-012312-B

Ordering Information

Part Number

Voltage

Junction Temperature Range

Package

Lead Finish

MIC5167YML

Adjustable

–40°C to +125°C

24-Pin 4x4 MLF

®

Pb-Free

Note:

MLF

Pin Configuration

24-Pin 4mm x 4mm MLF

Pin Description

Pin Number

Pin Name

Description

1, 6, 13, 18

PVIN

Power Supply Voltage (Input): The PVIN pins are the input supply to the internal P-Channel

Power MOSFET. A 22µF ceramic is recommended for bypassing at each PVIN pin. The SVIN

pin must be connected to the PVIN pin.

2

EN/DLY

Enable/Delay (Input): This pin is internally fed with a 1µA current source from SVIN. A delayed

turn on is implemented by adding a capacitor to this pin. The delay is proportional to the capacitor

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.

3

VDDQ

VDDQ (Input): VDDQ is connected to an internal precession divider which provides the reference

voltage (VREF).

4

VREF

VTT Reference (Output): This output provides an output of the internal reference voltage

VDDQ/2. Connect a 100pF capacitor to ground at this pin.

5

PG

PG (Output): This is an open drain output that indicates when the output voltage is within ±15%

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.

15

COMP

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

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.