MIC4574 Datasheet, PDF (3/6 Pages) Micrel Semiconductor – 200kHz Simple 0.5A Buck Voltage Regulator

MIC4574
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
Micrel
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
Condition
MIC4574 [Adjustable]
Feedback Voltage
Feedback Voltage
8V ≤ V_IN ≤ 24V, 0.1A ≤ I_LOAD ≤ 0.5A
Efficiency
Feedback Bias Current
I_LOAD = 0.5A, V_OUT = 5V
MIC4574-3.3
Output Voltage
Output Voltage
6V ≤ V_IN ≤ 24V, 0.1A ≤ I_LOAD ≤ 0.5A
Efficiency
MIC4574-5.0
Output Voltage
Output Voltage
8V ≤ V_IN ≤ 24V, 0.1A ≤ I_LOAD ≤ 0.5A
Efficiency
MIC4574 / -3.3 / -5.0
Oscillator Frequency
Saturation Voltage
I_OUT = 0.5A
Maximum Duty Cycle (On)
Current Limit
FB connected to 0V
Peak Current, t_ON ≤ 3µs
Output Leakage Current
Quiescent Current
Standby Quiescent Current
SHDN Input Logic Level
V_IN = 24V, FB connected to 6V
Output = 0V
Output = –1V
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)
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.
Min Typ Max Units
1.217 1.230 1.243 V
1.193 1.230 1.267 V
1.180
1.280 V
77
%
50
100
nA
500 nA
3.234 3.3 3.366 V
3.168 3.3 3.432 V
3.135
3.465 V
72
%
4.900 5.0 5.100 V
4.800 5.0 5.200 V
4.750
5.250 V
77
%
180 200 220 kHz
1
1.3
V
1.5
V
90
95
%
0.7
1.0
1.6
A
0.65
1.8
A
0
2
mA
7.5
30
mA
5
10
mA
50
200
µA
2.2
1.4
V
2.4
V
1.2
1.0
V
0.8
V
4
30
µA
–10 0.01 10
µA
4-94
April 1998•