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参数资料
| 型号： | LM2575-3.3BUT&R |
| 厂商： | MICREL INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封装： | TO-263, 5 PIN |
| 文件页数： | 8/12页 |
| 文件大小： | 152K |
| 代理商： | LM2575-3.3BUT&R |
Micrel, Inc.
LM2575
May 2009
5
M9999-051209-B
Symbol
Parameter
Condition
Typ
LM2575
Limit
(Note 2)
Units
(Limits)
DEVICE PARAMETERS, ADJUSTABLE REGULATOR
IB
Feedback Bias Current
VOUT = 5V
50
100/500
nA
DEVICE PARAMETERS, FIXED and ADJUSTABLE REGULATORS
fO
Oscillator Frequency
52
47/42
58/63
kHz
kHz(min)
kHz(max)
VSAT
Saturation Voltage
IOUT = 1A (Note 4)
0.9
1.2/1.4
V
V(max)
DC
Max Duty Cycle (ON)
(Note 5)
98
93
%
%(max)
ICL
Current Limit
Peak Current, tON ≤ 3s (Note 4)
2.2
1.7/1.3
3.0/3.2
A
A(min)
A(max)
IL
Output Leakage Current
VIN = 40V, (Note 6),
Output = 0V
Output = –1V
(Note 6)
Output = –1V
75
2
30
mA(max)
mA
mA(max)
IQ
Quiescent Current
(Note 6)
5
10
mA
mA(max)
ISTBY
Standby Quiescent Current
ON/OFF Pin = 5V (OFF)
50
200
A
A(max)
θJA
T Package, Junction to Ambient (Note 7)
65
θJA
T Package, Junction to Ambient (Note 8)
45
θJC
T Package, Junction to Case
2
θJA
N Package, Junction to Ambient (Note 9)
85
θJA
Thermal Resistance
WM Package, Junction to Ambient (Note 9)
100
°C/W
ON/OFF CONTROL, FIXED and ADJUSTABLE REGULATORS Test Circuit Figure 1
VIH
VIL
ON/OFF Pin Logic
Input Level
VOUT = 0V
VOUT = 5V
1.4
1.2
2.2/2.4
1.0/0.8
V(min)
V(max)
IIH
ON /OFF Pin = 5V (OFF)
4
30
A
A(max)
IIL
ON/OFF Pin Logic
Current
ON /OFF Pin = 0V (ON)
0.01
10
A
A(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.
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