Micrel, Inc.

MIC2250

April 2011

2

M9999-041811-B

Ordering Information

Part Number

Marking

(1)

Junction Temp. Range

Package

(3)

Lead Finish

MIC2250YML

A

ZA

(2)

–40° to +125°C

8-Pin 2mm x 2mm MLF

®

Pb-Free

MIC2250-1YD5

AZ1

(2)

–40° to +125°C

5-Pin Thin SOT-23

Pb-Free

MIC2250-2YD5

AZ2

(2)

–40° to +125°C

5-Pin Thin SOT-23

Pb-Free

Note:

1.

Pin 1 identifier = “

•”.

2.

Over/Underbar (

/__ ) may not be to scale.

3.

Pin Configuration

8-Pin 2mm x 2mm MLF

(Top View)

5-Pin Thin SOT-23 (D5)

(Top View)

Pin Description

Pin Name

Pin Number

MIC2250YML

Pin Number

MIC2250-1YD5

Pin Number

MIC2250-2YD5

Pin Function

FB

1

3

3

Feedback (Input): 1.24V output voltage sense node.

AGND

2

―

―

Analog Ground. Connect to power ground.

PGND

3

2

2

Power Ground.

SW

4

1

1

Switch Node (Input): Internal power NMOS drain.

NC

5

―

―

Not Internally Connected.

VIN

6

5

5

Supply (Input): 2.5V to 5.5V input voltage.

DITH

7

―

4

Frequency Dithering (Input): Connect this pin high to

enable pseudo-random on-time dithering to reduce EMI.

Connect this pin-to-ground to disable this function.

EN

8

4

4

Enable (Input): Logic high enables the regulator. Logic

low shuts down the regulator. Do not leave floating.

HS PAD

EPAD

―

―

Ground (Return): Exposed backside pad. Connect to

power ground.