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MIC4574 Datasheet(PDF) 3 Page - Micrel Semiconductor

Part No. MIC4574
Description  200kHz Simple 0.5A Buck Voltage Regulator
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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MIC4574 Datasheet(HTML) 3 Page - Micrel Semiconductor

   
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MIC4574
Micrel
4-94
April 1998•
Electrical Characteristics
V
IN =12V; ILOAD = 100mA; TA = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C; unless noted
Parameter
Condition
Min
Typ
Max
Units
MIC4574 [Adjustable]
Feedback Voltage
1.217
1.230
1.243
V
Feedback Voltage
8V
≤ V
IN ≤ 24V, 0.1A ≤ ILOAD ≤ 0.5A
1.193
1.230
1.267
V
1.180
1.280
V
Efficiency
I
LOAD = 0.5A, VOUT = 5V
77
%
Feedback Bias Current
50
100
nA
500
nA
MIC4574-3.3
Output Voltage
3.234
3.3
3.366
V
Output Voltage
6V
≤ V
IN ≤ 24V, 0.1A ≤ ILOAD ≤ 0.5A
3.168
3.3
3.432
V
3.135
3.465
V
Efficiency
72
%
MIC4574-5.0
Output Voltage
4.900
5.0
5.100
V
Output Voltage
8V
≤ V
IN ≤ 24V, 0.1A ≤ ILOAD ≤ 0.5A
4.800
5.0
5.200
V
4.750
5.250
V
Efficiency
77
%
MIC4574 / -3.3 / -5.0
Oscillator Frequency
180
200
220
kHz
Saturation Voltage
I
OUT = 0.5A
1
1.3
V
1.5
V
Maximum Duty Cycle (On)
FB connected to 0V
90
95
%
Current Limit
Peak Current, t
ON ≤ 3µs
0.7
1.0
1.6
A
0.65
1.8
A
Output Leakage Current
V
IN = 24V, FB connected to 6V
Output = 0V
0
2
mA
Output = –1V
7.5
30
mA
Quiescent Current
510
mA
Standby Quiescent Current
SHDN = 5V (regulator off)
50
200
µA
SHDN Input Logic Level
V
OUT = 0V (regulator off)
2.2
1.4
V
2.4
V
V
OUT = 3.3V or 5V (regulator on)
1.2
1.0
V
0.8
V
SHDN Input Current
SHDN = 5V (regulator off)
4
30
µA
SHDN = 0V (regulator on)
–10
0.01
10
µA
General Note: Devices are ESD protected, however, handling precautions are recommended.
Note 1:
The MIC4574 is not guaranteed to survive a short circuit to ground for input voltage above 24V.
Absolute Maximum Ratings
Supply Voltage (V
IN) Note 1 ....................................... +40V
Shutdown (V
SHDN) ....................................... –0.3V to +36V
Output Switch (V
SW) steady state ................................. –1V
Junction Temperature (T
J) ...................................... +150°C
Storage Temperature ............................... –65
°C to +150°C
Operating Ratings
Supply Voltage (V
IN) ................................................... +24V
Package Thermal Resistance
θ
JA Plastic DIP .................................................. 130°C/W
θ
JC SOIC ........................................................... 120°C/W


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