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参数资料
| 型号： | LM2574-3.3YN |
| 厂商： | MICREL INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | LEAD FREE, PLASTIC, DIP-8 |
| 文件页数： | 4/8页 |
| 文件大小： | 187K |
| 代理商： | LM2574-3.3YN |
LM2574
Micrel, Inc.
M9999-072805
4
July 2005
Electrical Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
Device Parameters, Adjustable Regulator
IB
Feedback Bias Current
VOUT = 5V
50
100
nA
500
nA
Device Parameters, Fixed and Adjustable Regulators
fo
Oscillator Frequency
Note 8
47
52
58
kHz
42
63
kHz
VSAT
Saturation Voltage
IOUT = 0.5A(4)
0.8
1.2
V
1.4
V
DC
Max Duty Cycle (ON)
Note 5
93
98
%
ICL
Current Limit
Peak Current, tON ≤ 3s(4)
0.7
1.0
1.6
A
0.65
1.8
IL
Output Leakage Current
VIN, Note 6, Output = 0V
2
mA
Note 6, Output = –1V
7.5
30
IQ
Quiescent Current
Note 6
5
10
mA
ISTBY
Standby Quiescent Current
ON/OFF Pin = 5V (OFF)
50
200
A
θJA
Thermal Resistance
N Package, Junction to Ambient(7)
85
°C/W
On/Off Control, Fixed and Adjustable Regulators Test Circuit Figures 2, 3
VIH
ON/OFF Input Level
VOUT = 0V
2.2
1.4
V
2.4
V
VIL
ON/OFF Input Level
VOUT = 5V
1.2
1.0
V
0.8
V
IIH
ON/OFF Logic Current
ON/OFF = 5V (OFF)
4
30
A
IIL
ON/OFF Logic Current
ON/OFF = 0V (ON)
0.01
10
A
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
22F
11DQ06
COUT
220F
330H
3.09k
1k
Figure 2. Adjustable Regulator Test Circuit
VIN
P W R
GND
SIG
GND
ON/
OFF
OUT
FB
LM2574–
3.3, 5, 12
CIN
22F
11DQ06
COUT
220F
330H
Figure 3. Fixed Regulator Test Circuit
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