Micrel, Inc.

MIC33263/4

Ordering Information

Part Number

Output Voltage

Auto Discharge

Junction Temperature Range

Package

(1, 2)

MIC33263YGK

ADJ

No

–40

°C to +85°C

20-Pin 2.5mm × 3mm QFN

MIC33264YGK

ADJ

Yes

–40

°C to +85°C

20-Pin 2.5mm × 3mm QFN

Note:

1.

QFN is a GREEN, RoHS-compliant package. Mold compound is Halogen Free.

2.

Pb-free. Lead finish is matte tin.

Pin Configuration

2.5mm × 3mm QFN (GK)

(Top View)

Pin Description

Pin Number

Pin Name

Pin Function

1, 20

PVIN

Power Input Voltage: Connect a capacitor to PGND to decouple the noise.

2, 8, 9

PGND

Power Ground.

3, 4, 5, 6, 7

SW

Switch (Output): Internal power MOSFET output switches. Disable pull down 180 Ohms

(MIC33164 only).

10, 11, 12, 13

VOUT

Inductor Output. Connect a capacitor to PGND to filter the switcher output voltage.

14

AGND

Analog Ground: Connect to central ground point where all high current paths meet (CIN, COUT,

PGND) for best operation.

15

AVIN

Analog Input Voltage: Connect a capacitor to ground to decouple the noise.

16

SS

Soft-Start: Place a capacitor from SS pin to ground to program the soft-start time

17

PG

Power Good: Open Drain output for the power good indicator. Place a resistor between this pin

and a voltage source to detect a power good condition.

18

FB

Feedback: Connect a resistor divider from the output to ground to set the output voltage.

19

EN

Enable (Input): Logic high enables operation of the regulator. Logic low will shut down the device.

Do not leave floating.

May 15, 2014

2

Revision 1.1