MIC2570 Datasheet, PDF (2/14 Pages) Micrel Semiconductor – Two-Cell Switching Regulator Preliminary Information

MIC2570
Ordering Information
Part Number
Temperature Range
MIC2570-1BM
–40°C to +85°C
MIC2570-2BM
–40°C to +85°C
* Externally selectable for 2.85V, 3.3V, or 5V
Voltage
Selectable*
Adjustable
Frequency
20kHz
20kHz
Package
8-lead SOIC
8-lead SOIC
Micrel
Pin Configuration
MIC2570-1
SW 1
8 IN
GND 2
7 SYNC
NC 3
6 2.85V
5V 4
5 3.3V
Selectable Voltage
20kHz Frequency
MIC2570-2
SW 1
8 IN
GND 2
7 SYNC
NC 3
6 FB
NC 4
5 NC
Adjustable Voltage
20kHz Frequency
8-Lead SOIC (M)
Pin Description
Pin No. (Version^†)
Pin Name
Pin Function
4
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.
† _{Example: (-1) indicates the pin description is applicable to the MIC2570-1 only.}
1997
4-63