MIC2570
Micrel, Inc.
Ordering Information
Part Number
Standard
MIC2570-1BM
MIC2570-2BM
Pb-Free
MIC2570-1YM
MIC2570-2YM
Temperature
Range
–40ºC to +85ºC
–40ºC to +85ºC
Voltage
Selectable*
Adjustable
Frequency
20kHz
20kHz
Package
8-pin SOIC
8-pin SOIC
* Externally selectable for 2.85V, 3.3V, or 5V
Pin Configuration
SW
1
GND
2
NC
3
5V
4
MIC2570-1
8
IN
7
SYNC
6
2.85V
5
3.3V
MIC2570-2
SW
1
8
7
6
5
IN
SYNC
FB
NC
GND
2
NC
3
NC
4
Selectable Voltage
20kHz Frequency
8-Lead SOIC (M)
Adjustable Voltage
20kHz Frequency
Pin Description
Pin No. (Version
†
)
1
2
3
4 (-1)
4 (-2)
5 (-1)
5 (-2)
6 (-1)
6 (-2)
7
8
†
Pin Name
SW
GND
NC
5V
NC
3.3V
NC
2.85V
FB
SYNC
IN
Pin Function
Switch: NPN output switch transistor collector.
Power Ground: NPN output switch transistor emitter.
Not internally connected.
5V Feedback (Input): Fixed 5V feedback to internal resistive divider.
Not internally connected.
3.3V Feedback (Input): Fixed 3.3V feedback to internal resistive divider.
Not internally connected.
2.85V Feedback (Input): Fixed 2.85V feedback to internal resistive divider.
Feedback (Input): 0.22V feedback from external voltage divider network.
Synchronization (Input): Oscillator start timing. Oscillator synchronizes to
falling edge of sync signal.
Supply (Input): Positive supply voltage input.
Example: (-1) indicates the pin description is applicable to the MIC2570-1 only.
MIC2570
2
August 2007
MICREL [ MICREL SEMICONDUCTOR ]
