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参数资料
| 型号： | LM2575-3.3WU |
| 厂商： | Micrel Inc |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 1A TO263-5 |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 4 V ~ 40 V |
| 频率 - 开关： | 42kHz ~ 63kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 包装： | 散装 |
| 供应商设备封装： | TO-263-5 |
Micrel, Inc.
LM2575
LM2575
Limit
Units
Symbol Parameter Condition
Typ
(Note 2)
(Limits)
DEVICE PARAMETERS, ADJUSTABLE REGULATOR
I B
Feedback Bias Current V OUT = 5V
50
100/ 500
nA
DEVICE PARAMETERS, FIXED and ADJUSTABLE REGULATORS
f O
Oscillator Frequency
52
47/ 42
kHz
kHz(min)
58/ 63
kHz(max)
V SAT
DC
Saturation Voltage
Max Duty Cycle (ON)
I OUT = 1A ( Note 4 )
( Note 5 )
0.9
98
1.2/ 1.4
V
V(max)
%
93
%(max)
I CL
Current Limit
Peak Current, t ON ≤ 3μs ( Note 4 )
2.2
1.7/ 1.3
A
A(min)
3.0/ 3.2
A(max)
I L
Output Leakage Current
V IN = 40V, ( Note 6 ),
Output = 0V
Output = –1V
75
2
mA(max)
mA
( Note 6 )
Output = –1V
30
mA(max)
I Q
I STBY
θ JA
Quiescent Current
Standby Quiescent Current
Thermal Resistance
( Note 6 )
ON/OFF Pin = 5V (OFF)
T Package, Junction to Ambient ( Note 7 )
5
50
65
10
200
mA
mA(max)
μA
μA(max)
°C/W
θ JA
θ JC
θ JA
θ JA
T Package, Junction to Ambient ( Note 8 )
T Package, Junction to Case
N Package, Junction to Ambient ( Note 9 )
WM Package, Junction to Ambient ( Note 9 )
45
2
85
100
ON/OFF CONTROL, FIXED and ADJUSTABLE REGULATORS Test Circuit Figure 1
V IH
V IL
I IH
ON/OFF Pin Logic
Input Level
ON/OFF Pin Logic
V OUT = 0V
V OUT = 5V
ON /OFF Pin = 5V (OFF)
1.4
1.2
4
2.2/ 2.4
1.0/ 0.8
V(min)
V(max)
μA
Current
30
μA(max)
I IL
ON /OFF Pin = 0V (ON)
0.01
10
μA
μA(max)
Notes:
1. Absolute Maximum Rating indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device
is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical
Characteristics.
2. All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face) . All room temperature limits are100%
production tested. All limits at temperature extreme 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
LM2575/LM1575 is used as shown in Figure 1 test circuit, system performance will be shown in system parameters section of Electrical
Characteristics.
4. Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output.
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 (no external heat sink) for the 5-pin TO-220 package mounted vertically, with 1/2" leads in a socket, or on PC
board with minimum copper area.
8. Junction to ambient thermal resistance (no external heat sink) for the 5-pin TO-220 package mounted vertically, with 1/4" leads soldered to PC
board containing approximately 4 square inches of copper area surrounding the leads.
9. Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper will lower
thermal resistance further.
May 2009
5
M9999-051209-B
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