Micrel, Inc.

MIC2291

May 2007

2

M9999-051507

Ordering Information

Part Number

Marking*

Overvoltage

Protection

Junction

Temp. Range

Package

Lead Finish

MIC2291BD5

SSAA

―

–40° to +125°C

5-Pin Thin SOT23

Standard

MIC2291YD5

SSAA

―

–40° to +125°C

5-Pin Thin SOT23

Pb-Free

MIC2291-15BML

STA

15

–40° to +125°C

8-Pin 2mm x 2mm MLF

®

Standard

MIC2291-15YML

STA**

15

–40° to +125°C

8-Pin 2mm x 2mm MLF

®

Pb-Free

MIC2291-34BML

STC

34

–40° to +125°C

8-Pin 2mm x 2mm MLF

®

Standard

MIC2291-34YML

STC**

34

–40° to +125°C

8-Pin 2mm x 2mm MLF

®

Pb-Free

Notes:

*

Under bar / Over bar symbol may not be to scale.

** Over bar symbol located after Pin 1 identifier.

Pin Configuration

FB GND

EN

VIN

SW

3

1

5

2

4

OVP

VIN

EN

AGND

PGND

SW

FB

NC

1

2

3

4

8

7

6

5

EP

5-Pin TSOT23 (D5)

8-Pin 2mm x 2mm MLF

Pin Description

Pin Number

TSOT23-5

Pin Number

2x2 MLF-8

Pin Name

Pin Name

1

7

SW

Switch node (Output): Internal power BIPOLAR collector.

2

GND

Ground (Return): Ground.

3

6

FB

Feedback (Input): Output voltage sense node. Connect the cathode

of the LED to this pin. Connect current set resistor from this pin to

ground.

4

3

EN

Enable (Input): Logic high (≥1.5V) enables regulator. Logic low

(≤0.4V) shuts down regulator.

5

2

VIN

Supply (Input): Input Voltage.

―

1

OVP

Overvoltage protection (Input): Connect to the output to clamp the

maximum output voltage.

―

4

AGND

Analog ground. Internally connected to ground.

―

8

PGND

Power ground.

―

5

NC

No connect (no internal connection to die).

―

EP

GND

Ground (Return): Exposed backside pad.