LM2574(2003) Ver la hoja de datos (PDF) - Micrel
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LM2574 Datasheet PDF : 8 Pages
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LM2574
Absolute Maximum Ratings(1)
Maximum Supply Voltage
LM2574 ..................................................................... 45V
OFF Pin Input Voltage ................................ –0.3V ≤ V ≤ VIN
Output Voltage to Ground (Steady State) ..................... –1V
Power Dissipation .................................... Internally Limited
Storage Temperature Range (TS) ............ –65°C to +150°C
Minimum ESD Rating
C = 100pF, R = 1.5kΩ ............................................... 2kV
FB Pin ....................................................................... 1kV
Lead Temperature (soldering, 10 sec.) ..................... 260°C
Micrel
Operating Ratings(1)
Supply Voltage
LM2574 ..................................................................... 40V
Temperature Range
LM2574 ......................................... –40°C ≤ TJ ≤ +125°C
Maximum Junction Temperature (TJ ............................... 150°C
Electrical Characteristics(2)
Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range.
Unless otherwise specified, VIN = 12V, and ILOAD = 100mA.
Symbol
Parameter
Condition
Min Typ Max Units
System Parameters, Adjustable Regulators(3), Test Circuit Figure 2
VOUT
Feedback Voltage
VIN = 12V, ILOAD = 0.1A, VOUT = 5V
VOUT
Feedback Voltage
(LM2574)
0.1A ≤ ILOAD ≤ 0.5A, 7V≤ VIN ≤ 40V,
VOUT = 5V
η
Efficiency
VIN = 12V, ILOAD = 0.1A, VOUT = 5V
System Parameters, 3.3V Regulators(3), Test Circuit Figure 3
1.217 1.230 1.243 V
1.193 1.230 1.267 V
1.180
1.280 V
78
%
VOUT
Output Voltage
VIN = 12V, ILOAD = 0.1A, VOUT = 3.3V
VOUT
Output Voltage
(LM2574-3.3)
0.1A ≤ ILOAD ≤ 0.5A, 4.75V ≤ VIN ≤ 40V,
VOUT = 3.3V
η
Efficiency
VIN = 12V, ILOAD = 0.1A
System Parameters, 5V Regulators(3), Test Circuit Figure 3
3.234 3.3 3.366 V
3.168 3.3 3.432 V
3.135
3.465 V
73
%
VOUT
VOUT
η
Output Voltage
Output Voltage
(LM2574-5.0)
Efficiency
VIN = 12V, ILOAD = 0.1A, VOUT = 5V
0.1A ≤ ILOAD ≤ 0.5A, 7V≤ VIN ≤ 40V,
VOUT = 5V
VIN = 12V, ILOAD = 0.1A, VOUT = 5V
4.900 5.0 5.100 V
4.800 5.0 5.200 V
4.750
5.250 V
78
%
Notes:
1. “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. “Operating Ratings” indicate for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see “Electrical
Characteristics.”
2. All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via testing.
3. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.
When the LM2574 is used as shown in Figure 1 test circuit, system performance will be shown in system parameters section of “Electrical Charac-
teristics.”
December 2003
3
M9999-122303
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