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参数资料
| 型号： | LM2574N-ADJ |
| 厂商： | MOTOROLA 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： | PLASTIC, DIP-8 |
| 文件页数： | 19/24页 |
| 文件大小： | 396K |
| 代理商： | LM2574N-ADJ |
LM2574
4
MOTOROLA ANALOG IC DEVICE DATA
SYSTEM PARAMETERS ([Note 1] Test Circuit Figure 16)
ELECTRICAL CHARACTERISTICS (continued) (Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version,
Vin = 25 V for the 12 V version, Vin = 30 V for the 15 V version. ILoad = 100 mA. For typical values TJ = 25°C, for min/max values TJ is the
operating junction temperature range that applies [Note 2], unless otherwise noted).
Characteristic
Unit
Max
Typ
Min
Symbol
ALL OUTPUT VOLTAGE VERSIONS
Feedback Bias Current Vout = 5.0 V (Adjustable Version Only)
Ib
nA
TJ = 25°C
–
25
100
TJ = –40 to +125°C
–
200
Oscillator Frequency (Note 3)
fO
kHz
TJ = 25°C
–
52
–
TJ = 0 to +125°C
47
52
58
TJ = –40 to +125°C
42
–
63
Saturation Voltage (Iout = 0.5 A, [Note 4])
Vsat
V
TJ = 25°C
–
1.0
1.2
TJ = –40 to +125°C
–
1.4
Max Duty Cycle (“on”) [Note 5]
DC
93
98
–
%
Current Limit Peak Current (Notes 3 and 4)
ICL
A
TJ = 25°C
0.7
1.0
1.6
TJ = –40 to +125°C
0.65
–
1.8
Output Leakage Current (Notes 6 and 7), TJ = 25°C
IL
mA
Output = 0 V
–
0.6
2.0
Output = – 1.0 V
–
10
30
Quiescent Current (Note 6)
IQ
mA
TJ = 25°C
–
5.0
9.0
TJ = –40 to +125°C
–
11
Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”))
Istby
A
TJ = 25°C
–
60
200
TJ = –40 to +125°C
–
400
ON/OFF Pin Logic Input Level
V
Vout = 0 V
VIH
TJ = 25°C
2.2
1.4
–
TJ = –40 to +125°C
2.4
–
Nominal Output Voltage
VIL
TJ = 25°C
–
1.2
1.0
TJ = –40 to +125°C
–
0.8
ON/OFF Pin Input Current
A
ON/OFF Pin = 5.0 V (“off”), TJ = 25°C
IIH
–
15
30
ON/OFF Pin = 0 V (“on”), TJ = 25°C
IIL
–
0
5.0
NOTES: 1. External components such as the catch diode, inductor, input and output capacitors can affect the switching regulator system
performance. When the LM2574 is used as shown in the Figure 16 test circuit, the system performance will be as
shown in the system parameters section of the Electrical Characteristics.
2. Tested junction temperature range for the LM2574: Tlow = –40°C Thigh = +125°C
3. The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output
voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of
the IC by lowering the minimum duty cycle from 5% down to approximately 2%.
4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to the output pin.
5. Feedback (Pin 4) removed from output and connected to 0 V.
6. Feedback (Pin 4) removed from output and connected to 12 V for the Adjustable, 3.3 V, and 5.0 V versions, and 25 V for the 12 V and 15 V
versions, to force the output transistor OFF.
7. Vin = 40 V.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2574N-ADJ NOPB | 制造商:National Semiconductor 功能描述:Conv DC-DC Single Step Down 4V to 40V 8-Pin PDIP |
| LM2574N-ADJ | 制造商:Texas Instruments 功能描述:SWITCHING REG 0.5A ADJ 2574 DIP8 |
| LM2574N-ADJ/NOPB | 功能描述:直流/直流开关转换器 0.5A STEP-DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2574N-ADJG | 功能描述:直流/直流开关调节器 500mA Adj. Step Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2574N-ADJG | 制造商:ON Semiconductor 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
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