Micrel, Inc.

MIC4722

September 2007

2

M9999-090507-B

Ordering Information

Part Number

Voltage

Junction Temp. Range

Package

Lead Finish

MIC4722YML

Adj.

–40° to +125°C

12-Pin 3x3 MLF

®

Pb-Free

Note:

MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

Pin Configuration

BIAS

EN

SW

VIN

PGND

SGND

SW

VIN

PGND

PGOOD

5

1

2

3

4

8

FB

NC

67

12

11

10

9

EP

12-Pin 3mm x 3mm MLF

Pin Description

Pin Number

Pin Name

Pin Function

1,12

SW

Switch (Output): Internal power P-Channel MOSFET output switch

2,11

VIN

Supply Voltage (Input): Supply voltage for the source of the internal P-channel

MOSFET and driver.

Requires bypass capacitor to GND.

3,10

PGND

Power Ground. Provides the ground return path for the high-side drive current.

4

SGND

Signal (Analog) Ground. Provides return path for control circuitry and internal

reference.

5

BIAS

Internal circuit bias supply. Must be bypassed with a 0.1µF ceramic capacitor to

SGND.

6

FB

Feedback. Input to the error amplifier, connect to the external resistor divider

network to set the output voltage.

7

NC

No Connect. Not internally connected to die. This pin can be tied to any other pin

if desired.

8

EN

Enable (Input). Logic level low, will shutdown the device, reducing the current

draw to less than 5µA.

9

PGOOD

Power Good. Open drain output that is pulled to ground when the output voltage

is within +/- 7.5% of the set regulation voltage

EP

GND

Connect to ground.