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参数资料
| 型号： | LM2574YN |
| 厂商： | Micrel Inc |
| 文件页数： | 4/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.5A 8DIP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 37 V |
| 输入电压： | 4.75 V ~ 40 V |
| 频率 - 开关： | 52kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
| 产品目录页面： | 1091 (CN2011-ZH PDF) |
| 其它名称： | 576-1515-5 LM2574YN-ND |
LM2574
Electrical Characteristics
Micrel, Inc.
Symbol
Parameter
Condition
Min
Typ
Max
Units
Device Parameters, Adjustable Regulator
I B
Feedback Bias Current
V OUT = 5V
50
100
500
nA
nA
Device Parameters, Fixed and Adjustable Regulators
f o
V SAT
DC
I CL
I L
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
Output Leakage Current
Note 8
I OUT = 0.5A (4)
Note 5
Peak Current, t ON ≤ 3μs (4)
V IN , Note 6 , Output = 0V
Note 6 , Output = –1V
47
42
93
0.7
0.65
52
0.8
98
1.0
7.5
58
63
1.2
1.4
1.6
1.8
2
30
kHz
kHz
V
V
%
A
mA
I Q Quiescent Current Note 6
I STBY Standby Quiescent Current ON/OFF Pin = 5V (OFF)
θ JA Thermal Resistance N Package, Junction to Ambient (7)
On/Off Control, Fixed and Adjustable Regulators Test Circuit Figures 2, 3
5
50
85
10
200
mA
μA
°C/W
V IH
ON/OFF Input Level
V OUT = 0V
2.2
2.4
1.4
V
V
V IL
I IH
I IL
ON/OFF Input Level
ON/OFF Logic Current
ON/OFF Logic Current
V OUT = 5V
ON/OFF = 5V (OFF)
ON/OFF = 0V (ON)
1.2
4
0.01
1.0
0.8
30
10
V
V
μA
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
C IN
22μF
FB
V IN
LM2574
(adjustable)
OUT
PWR SIG ON/
GND GND OFF
330μH
11DQ06
C OU T
220μF
3.09k
1k
Figure 2. Adjustable Regulator Test Circuit
3.3, 5, 12
C IN
22μF
FB
V IN
LM2574 –
OUT
PWR S I G ON/
GND GND O F F
330μH
11DQ06
C OU T
220μF
Figure 3. Fixed Regulator Test Circuit
M9999-072805
4
July 2005
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