1997

4-77

MIC2571

Micrel

4

Ordering Information

Part Number

Temperature Range

Voltage

Frequency

Package

MIC2571-1BMM

–40

°C to +85°C

Selectable*

20kHz

8-lead MSOP

MIC2571-2BMM

–40

°C to +85°C

Adjustable

20kHz

8-lead MSOP

* Externally selectable for 2.85V, 3.3V, or 5V

Pin Configuration

1

2

3

4

8

7

6

5

SW

GND

NC

5V

IN

SYNC

2.85V

3.3V

MIC2571-1

Selectable Voltage

20kHz Frequency

1

2

3

4

8

7

6

5

IN

SYNC

FB

NC

SW

GND

NC

NC

MIC2571-2

Adjustable Voltage

20kHz Frequency

8-Lead MSOP (MM)

Pin Description

Pin Name

Pin Function

1

SW

Switch: NPN output switch transistor collector.

2

GND

Power Ground: NPN output switch transistor emitter.

3

NC

Not internally connected.

4 (-1)

5V

5V Feedback (Input): Fixed 5V feedback to internal resistive divider.

4 (-2)

NC

Not internally connected.

5 (-1)

3.3V

3.3V Feedback (Input): Fixed 3.3V feedback to internal resistive divider.

5 (-2)

NC

Not internally connected.

6 (-1)

2.85V

2.85V Feedback (Input): Fixed 2.85V feedback to internal resistive divider.

6 (-2)

FB

Feedback (Input): 0.22V feedback from external voltage divider network.

7

SYNC

Synchronization (Input): Oscillator start timing. Oscillator synchronizes to

falling edge of sync signal.

8

IN

Supply (Input): Positive supply voltage input.