MIC4574
Micrel
Ordering Information
Part Number
MIC4574-3.3BN
MIC4574-5.0BN
MIC4574BN
MIC4574-3.3BWM
MIC4574-5.0BWM
MIC4574BWM
Voltage
3.3V
5.0V
Adjustable
3.3V
5.0V
Adjustable
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
8-pin DIP
8-pin DIP
8-pin DIP
14-lead SOIC
14-lead SOIC
14-lead SOIC
Pin Configuration
NC 1
NC 2
FB 3
14 NC
13 NC
12 SW
11 NC
10 V
IN
9 NC
8 NC
FB 1
SGND 2
SHDN 3
PGND 4
8
7
6
5
NC
SW
NC
V
IN
SGND 4
SHDN 5
PGND 6
NC 7
4
8-Pin DIP (N)
14-Lead Wide SOIC (WM)
Pin Description
Pin Number
N Package
Pin Number
WM Package
1
2
1
3
Pin Name
NC
NC
FB
Pin Function
Not internally connected. Solder to printed circuit for maximum heat transfer.
Not internally connected. Solder to printed circuit for maximum heat transfer.
Feedback (Input): Output voltage feedback to regulator. Connect to output of
supply for fixed versions. Connect to 1.23V tap of resistive divider for
adjustable versions.
Signal Ground
Shutdown (Input): Logic low enables regulator. Logic high (> 2.4V) shuts
down regulator.
Power Ground
Not internally connected. Solder to printed circuit for maximum heat transfer.
Not internally connected. Solder to printed circuit for maximum heat transfer.
Not internally connected. Solder to printed circuit for maximum heat transfer.
Supply Voltage (Input): Unregulated +4V to +24V supply voltage.
Not internally connected. Solder to printed circuit for maximum heat transfer.
Switch (Output): Emitter of NPN output switch. Connect to external storage
inductor and Shottky diode.
Not internally connected. Solder to printed circuit for maximum heat transfer.
Not internally connected. Solder to printed circuit for maximum heat transfer.
2
3
4
4
5
6
7
8
9
SGND
SHDN
PGND
NC
NC
NC
V
IN
NC
SW
NC
NC
5
10
11
7
8
12
13
14
April 1998•
4-93
MICREL [ MICREL SEMICONDUCTOR ]
