MIC4574
Micrel
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
Electrical Characteristics
V
IN
=12V; I
LOAD
= 100mA; T
A
= 25°C,
bold
values indicate –40°C
≤
T
A
≤
+85°C; unless noted
Parameter
MIC4574 [Adjustable]
Feedback Voltage
Feedback Voltage
Efficiency
Feedback Bias Current
MIC4574-3.3
Output Voltage
Output Voltage
Efficiency
MIC4574-5.0
Output Voltage
Output Voltage
Efficiency
MIC4574 / -3.3 / -5.0
Oscillator Frequency
Saturation Voltage
Maximum Duty Cycle (On)
Current Limit
Output Leakage Current
I
OUT
= 0.5A
FB connected to 0V
Peak Current, t
ON
≤
3µs
V
IN
= 24V, FB connected to 6V
Output = 0V
Output = –1V
90
0.7
0.65
180
200
1
95
1.0
1.6
1.8
2
30
10
200
220
1.3
1.5
kHz
V
V
%
A
A
mA
mA
mA
µA
V
V
1.0
0.8
30
10
V
V
µA
µA
8V
≤
V
IN
≤
24V, 0.1A
≤
I
LOAD
≤
0.5A
4.900
4.800
4.750
5.0
5.0
77
5.100
5.200
5.250
V
V
V
%
6V
≤
V
IN
≤
24V, 0.1A
≤
I
LOAD
≤
0.5A
3.234
3.168
3.135
3.3
3.3
72
3.366
3.432
3.465
V
V
V
%
8V
≤
V
IN
≤
24V, 0.1A
≤
I
LOAD
≤
0.5A
I
LOAD
= 0.5A, V
OUT
= 5V
1.217
1.193
1.180
1.230
1.230
77
50
100
500
1.243
1.267
1.280
V
V
V
%
nA
nA
Condition
Min
Typ
Max
Units
0
7.5
5
Quiescent Current
Standby Quiescent Current
SHDN Input Logic Level
SHDN = 5V (regulator off)
V
OUT
= 0V (regulator off)
V
OUT
= 3.3V or 5V (regulator on)
SHDN Input Current
SHDN = 5V (regulator off)
SHDN = 0V (regulator on)
2.2
2.4
50
1.4
1.2
4
0.01
–10
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.
4-94
April 1998•
MICREL [ MICREL SEMICONDUCTOR ]
