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LM2574 датащи(PDF) 4 Page - Micrel Semiconductor

номер детали LM2574
подробное описание детали  52KHZ SIMPLE 0.5A BUCK REGULATOR
Download  8 Pages
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производитель  MICREL [Micrel Semiconductor]
домашняя страница  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

LM2574 датащи(HTML) 4 Page - Micrel Semiconductor

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LM2574
Micrel
M9999-122303
4
December 2003
Electrical Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
Device Parameters, Adjustable Regulator
I
B
Feedback Bias Current
V
OUT = 5V
50
100
nA
500
nA
Device Parameters, Fixed and Adjustable Regulators
f
o
Oscillator Frequency
Note 8
47
52
58
kHz
42
63
kHz
V
SAT
Saturation Voltage
I
OUT = 0.5A
(4)
0.8
1.2
V
1.4
V
DC
Max Duty Cycle (ON)
Note 5
93
98
%
I
CL
Current Limit
Peak Current, t
ON ≤ 3µs
(4)
0.7
1.0
1.6
A
0.65
1.8
I
L
Output Leakage Current
V
IN, Note 6, Output = 0V
2
mA
Note 6, Output = –1V
7.5
30
I
Q
Quiescent Current
Note 6
510
mA
I
STBY
Standby Quiescent Current
ON/OFF Pin = 5V (OFF)
50
200
µA
θ
JA
Thermal Resistance
N Package, Junction to Ambient(7)
85
°C/W
On/Off Control, Fixed and Adjustable Regulators Test Circuit
Figures 2, 3
V
IH
ON/OFF Input Level
V
OUT = 0V
2.2
1.4
V
2.4
V
V
IL
ON/OFF Input Level
V
OUT = 5V
1.2
1.0
V
0.8
V
I
IH
ON/OFF Logic Current
ON/OFF = 5V (OFF)
4
30
µA
I
IL
ON/OFF Logic Current
ON/OFF = 0V (ON)
0.01
10
µA
Notes:
4. Output (pin 2) sourcing current. No diode, inductor, or capacitor connected to input.
5. Feedback (pin 4) removed from output and connected to 0V.
6. Feedback (pin 4) removed from output and connected to 12V to force the output transistor OFF.
7. Junction-to-ambient thermal resistance with approximately 1 square inches of PC board copper surrounding the leads.
Test Circuit
VIN
PWR
GND
SIG
GND
ON/
OFF
OUT
FB
LM2574
(adjustable)
CIN
22µF
11DQ06
COUT
220µF
330µH
3.09k
1k
Figure 2. Adjustable Regulator Test Circuit
VIN
PWR
GND
SIG
GND
ON/
OFF
OUT
FB
LM2574–
3.3, 5
CIN
22
µF
11DQ06
COUT
220
µF
330
µH
Figure 3. Fixed Regulator Test Circuit


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