MIC4574-3.3YN Micrel Inc, MIC4574-3.3YN Datasheet - Page 4

• Manufacturer Part Number: MIC4574-3.3YN
• Description: 200kHz 0.5A Step-down Regulator ( )
• Manufacturer: Micrel Inc
• Type: Step-Down (Buck)r

Specifications of MIC4574-3.3YN

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V
• Current - Output: 500mA
• Frequency - Switching: 200kHz
• Voltage - Input: 4 ~ 24 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-2338; MIC4574-3.3YN

MIC4574
Block Diagrams
M9999-062105
Shutdown
Enable
Shutdown
Enable
SHDN
SHDN
MIC4574
MIC4574-x.x
Regulator
Regulator
Oscillator
Oscillator
Internal
200kHz
200kHz
Internal
Block Diagram with External Components
Block Diagram with External Components
[Adjustable]
parator
parator
Com-
Adjustable Step-Down Regulator
Com-
Error
Amp.
Error
Amp.
Fixed Step-Down Regulator
Shutdown
Shutdown
Thermal
Thermal
Bandgap
Bandgap
1.23V
1.23V
Driver
Driver
Current
Current
Limit
Limit
4
GND
R2
GND
R1
0.5A
Switch
0.5A
Switch
+24V max.
+24V max.
V
V
IN
IN
SW
FB
SW
FB
V
R1
D1
D1
C
OUT
C
IN
IN
L1
L1
R2
V
R1
R2
REF
V
V
OUT
REF
R2
R1
+ 1
1
C
C
OUT
OUT
V
V
OUT
OUT
Micrel, Inc.
June 2005