MIC2291

Micrel

M9999-081104

2

August, 2004

Pin Description

Pin Number

Pin Number

TSOT-23-5

2mm

××××× 2mm MLF™ Pin Name

Pin Function

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.

Pin Configuration

FB GND

EN

VIN

SW

3

1

5

2

4

TSOT-23-5 (BD5)

OVP

VIN

EN

AGND

PGND

SW

FB

NC

1

2

3

4

8

7

6

5

EP

8-Pin MLF™ (BML)

(Top View)

Fused Lead Frame

Ordering Information

Marking

Overvoltage

Junction

Part Number

Code

Protection

Temp. Range

Package

Lead Finish

MIC2291BD5

SSAA

—–40

°C to 125°C

Thin SOT-23-5

Standard

MIC2291YD5

SSAA

—–40

°C to 125°C

Thin SOT-23-5

Pb-Free

MIC2291-15BML

STA

15V

–40

°C to 125°C 2mm × 2mm MLF™

Standard

MIC2291-15YML

STA

15V

–40

°C to 125°C 2mm × 2mm MLF™

Pb-Free

MIC2291-34BML

STC

34V

–40

°C to 125°C 2mm × 2mm MLF™

Standard

MIC2291-34YML

STC

34V

–40

°C to 125°C 2mm × 2mm MLF™

Pb-Free