mic4574 Micrel Semiconductor, mic4574 Datasheet - Page 2

• Manufacturer Part Number: mic4574
• Description: Mic4574 200khz Simple 0.5a Buck Regulator
• Manufacturer: Micrel Semiconductor

MIC4574
Ordering Information
Pin Configuration
Pin Description
M9999-062105
Pin Number
6, 8
1
2
3
4
5
7
Standard
MIC4574-3.3BN
MIC4574-5.0BN
MIC4574BN
Pin Name
SGND
PGND
SHDN
VIN
SW
NC
FB
Part Number
Pb-Free
MIC4574-3.3YN
MIC4574-5.0YN
MIC4574YN
SGND
SHDN
PGND
FB
Pin Function
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.
Supply Voltage (Input): Unregulated +4V to +24V supply voltage.
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.
1
2
3
4
8-Pin DIP (N)
2
Adjustable
Voltage
3.3V
5.0V
8
7
6
5
NC
SW
NC
V
IN
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Temperature
Range
8-pin DIP
8-pin DIP
8-pin DIP
Package
Micrel, Inc.
June 2005