MIC4574
Micrel, Inc.
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
),
Note 5
...................................... +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
ESD Rating,
Note 3
Operating Ratings
(Note 2)
Supply Voltage (V
IN
) ................................................... +24V
Package Thermal Resistance
θ
JA
Plastic DIP .................................................. 130°C/W
Electrical Characteristics
(Note 4)
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
35
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
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
50
2.2
2.4
1.4
1.2
4
0.01
SHDN = 5V (regulator off)
SHDN = 0V (regulator on)
–10
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
Specification for packaged product only.
The MIC4574 is not guaranteed to survive a short circuit to ground for input voltage above 24V.
June 2005
3
M9999-062105
MICREL [ MICREL SEMICONDUCTOR ]
