Micrel, Inc.
MIC4685
Ordering Information
Part Number
Standard
MIC4685BR
RoHS Compliant*
MIC4685WR
MIC4685WR EV
Voltage
Adj.
Adj.
Junction
Temp. Range
–40° to +125°C
Package
7-Pin SPAK
Evaluation Board
*
RoHS compliant with ‘high-melting solder’ exemption.
Pin Configuration
7
6
5
4
3
2
1
NC
SW
EN
GND
FB
IN
BS
7-Pin SPAK (R)
Pin Description
Pin Number
1
2
3
4, Tab
5
6
7
Pin Name
BS
IN
FB
GND
EN
SW
NC
Pin Function
Bootstrap Voltage Node (External Component): Connect to external boost
capacitor.
Supply (Input): Unregulated +4V to 30V supply voltage (34V transient)
Feedback (Input): Outback voltage feedback to regulator. Connect to 1.235V
tap of resistive divider.
Ground
Enable (Input): Logic high = enable; logic low = shutdown
Switch (Output): Emitter of NPN output switch. Connect to external storage
inductor and Schottky diode.
No Connect. Tie this pin-to-ground.
January 2010
2
M9999-012610
MICREL [ MICREL SEMICONDUCTOR ]
