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LM2574 Datasheet(PDF) 3 Page - Micrel Semiconductor

Part # LM2574
Description  52kHz Simple 0.5A Buck Regulator
Download  5 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

LM2574 Datasheet(HTML) 3 Page - Micrel Semiconductor

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December 2003
3
M9999-122303
LM2574
Micrel
Absolute Maximum Ratings(1)
Maximum Supply Voltage
LM2574 ..................................................................... 45V
OFF Pin Input Voltage ................................ –0.3V
≤ V ≤ V
IN
Output Voltage to Ground (Steady State) ..................... –1V
Power Dissipation .................................... Internally Limited
Storage Temperature Range (T
S) ............ –65°C to +150°C
Minimum ESD Rating
C = 100pF, R = 1.5k
Ω ............................................... 2kV
FB Pin ....................................................................... 1kV
Lead Temperature (soldering, 10 sec.) ..................... 260
°C
Operating Ratings(1)
Supply Voltage
LM2574 ..................................................................... 40V
Temperature Range
LM2574 ......................................... –40
°C ≤ T
J ≤ +125°C
Maximum Junction Temperature (T
J ............................... 150°C
Electrical Characteristics(2)
Specifications with standard typeface are for T
J = 25°C, and those with boldface type apply over full Operating Temperature Range.
Unless otherwise specified, V
IN = 12V, and ILOAD = 100mA.
Symbol
Parameter
Condition
Min
Typ
Max
Units
System Parameters, Adjustable Regulators(3), Test Circuit
Figure 2
V
OUT
Feedback Voltage
V
IN = 12V, ILOAD = 0.1A, VOUT = 5V
1.217
1.230
1.243
V
V
OUT
Feedback Voltage
0.1A
≤ I
LOAD ≤ 0.5A, 7V≤ VIN ≤ 40V,
1.193
1.230
1.267
V
(LM2574)
V
OUT = 5V
1.180
1.280
V
η
Efficiency
V
IN = 12V, ILOAD = 0.1A, VOUT = 5V
78
%
System Parameters, 3.3V Regulators(3), Test Circuit
Figure 3
V
OUT
Output Voltage
V
IN = 12V, ILOAD = 0.1A, VOUT = 3.3V
3.234
3.3
3.366
V
V
OUT
Output Voltage
0.1A
≤ I
LOAD ≤ 0.5A, 4.75V ≤ VIN ≤ 40V,
3.168
3.3
3.432
V
(LM2574-3.3)
V
OUT = 3.3V
3.135
3.465
V
η
Efficiency
V
IN = 12V, ILOAD = 0.1A
73
%
System Parameters, 5V Regulators(3), Test Circuit
Figure 3
V
OUT
Output Voltage
V
IN = 12V, ILOAD = 0.1A, VOUT = 5V
4.900
5.0
5.100
V
V
OUT
Output Voltage
0.1A
≤ I
LOAD ≤ 0.5A, 7V≤ VIN ≤ 40V,
4.800
5.0
5.200
V
(LM2574-5.0)
V
OUT = 5V
4.750
5.250
V
η
Efficiency
V
IN = 12V, ILOAD = 0.1A, VOUT = 5V
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.”


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