mic4574 Micrel Semiconductor, mic4574 Datasheet - Page 3

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

Absolute Maximum Ratings
Supply Voltage (V
Shutdown (V
Output Switch (V
Junction Temperature (T
Storage Temperature ............................... –65°C to +150°C
ESD Rating, Note 3
Electrical Characteristics
V
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
Quiescent Current
Standby Quiescent Current
SHDN Input Logic Level
SHDN Input Current
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
June 2005
MIC4574
IN
=12V; I
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.
LOAD
SHDN
= 100mA; T
SW
) ....................................... –0.3V to +36V
IN
) steady state ................................. –1V
), Note 5 ...................................... +40V
J
A
) ...................................... +150°C
= 25°C, bold values indicate –40°C ≤ T
Condition
8V ≤ V
I
6V ≤ V
8V ≤ V
I
FB connected to 0V
Peak Current, t
V
Output = 0V
Output = –1V
SHDN = 5V (regulator off)
V
V
SHDN = 5V (regulator off)
SHDN = 0V (regulator on)
LOAD
OUT
IN
OUT
OUT
(Note 4)
= 24V, FB connected to 6V
= 0.5A
= 0V (regulator off)
= 3.3V or 5V (regulator on)
= 0.5A, V
IN
IN
IN
(Note 1)
≤ 24V, 0.1A ≤ I
≤ 24V, 0.1A ≤ I
≤ 24V, 0.1A ≤ I
ON
OUT
≤ 3µs
= 5V
LOAD
LOAD
LOAD
≤ 0.5A
≤ 0.5A
≤ 0.5A
3
A
Operating Ratings
Supply Voltage (V
Package Thermal Resistance
≤ +85°C; unless noted
θ
JA
Plastic DIP .................................................. 130°C/W
IN
) ................................................... +24V
(Note 2)
1.217
1.193
1.180
3.234
3.168
3.135
4.900
4.800
4.750
0.65
Min
180
–10
0.7
2.2
2.4
90
1.230
1.230
0.01
Typ
200
3.3
3.3
5.0
5.0
1.0
7.5
1.4
1.2
50
77
50
72
77
95
1
0
5
4
1.243
1.267
1.280
3.366
3.432
3.465
5.100
5.200
5.250
Max
100
500
220
200
1.3
1.5
1.6
1.8
1.0
0.8
35
10
30
10
M9999-062105
2
Micrel, Inc.
Units
kHz
mA
mA
mA
nA
nA
µA
µA
µA
%
%
%
%
V
V
V
V
V
V
V
V
V
V
V
A
A
V
V
V
V