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LM2575YWM-TR [MICROCHIP]

IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR,SOP,24PIN,PLASTIC;
LM2575YWM-TR
型号： LM2575YWM-TR
厂家： MICROCHIP    MICROCHIP
描述：

IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR,SOP,24PIN,PLASTIC

开关 光电二极管
文件： 总12页 (文件大小：152K)
中文：  中文翻译
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LM2575  
52kHz Simple 1A Buck Regulator  
General Description  
Features  
The LM2575 series of monolithic integrated circuits  
provide all the active functions for a step-down (buck)  
switching regulator. Fixed versions are available with a  
3.3V, 5V, 12V, fixed output. Adjustable versions have an  
output voltage range from 1.23V to 37V. Both versions are  
capable of driving a 1A load with excellent line and load  
regulation.  
• 3.3V, 5V, 12V, and adjustable output versions  
• Voltage over specified line and load conditions:  
–
Fixed version: ±3% max. output voltage  
–
Adjustable version: ±2% max. feedback voltage  
• Guaranteed 1A output current  
• Wide input voltage range  
–
4V to 40V  
• Wide output voltage range  
1.23V to 37V  
These regulators are simple to use because they require a  
minimum number of external components and include  
internal frequency compensation and a fixed-frequency  
oscillator.  
–
• Requires only 4 external components  
The LM2575 series offers a high efficiency replacement for  
popular three-terminal adjustable linear regulators. It  
substantially reduces the size of the heat sink, and in  
many cases no heat sink is required.  
• 52kHz fixed frequency internal oscillator  
• Low power standby mode IQ typically <200µA  
• 80% efficiency (adjustable version typically >80%)  
• Uses readily available standard inductors  
• Thermal shutdown and current limit protection  
• 100% electrical thermal limit burn-in  
A standard series of inductors available from several  
different manufacturers are ideal for use with the LM2575  
series. This feature greatly simplifies the design of switch-  
mode power supplies.  
The feedback voltage is guaranteed to ±2% tolerance for  
adjustable versions, and the output voltage is guaranteed  
to ±3% for fixed versions, within specified input voltages  
and output load conditions. The oscillator frequency is  
guaranteed to ±10%. External shutdown is included,  
featuring less than 200µA standby current. The output  
switch includes cycle-by-cycle current limiting and thermal  
shutdown for full protection under fault conditions.  
Applications  
• Simple high-efficiency step-down (buck) regulator  
• Efficient pre-regulator for linear regulators  
• On-card switching regulators  
• Positive to negative converter (inverting Buck-Boost)  
• Isolated flyback converter using minimum number of  
external components  
Data sheets and support documentation can be found on  
Micrel’s web site at www.micrel.com.  
• Negative boost converter  
___________________________________________________________________________________________________________  
Typical Applications  
7V–40V  
Unregulated  
DC Input  
7V–40V  
Unregulated  
DC Input  
+5V, 1A  
Regulated  
Output  
+5V, 1A  
Regulated  
Output  
4
4
Feedback  
L1  
Feedback  
L1  
1
1
LM2575  
LM2575-5.0  
Output  
2
Output  
2
+VIN  
+VIN  
330µH  
D1  
330µH  
D1  
+
+
R2 3.09k  
R1 1k  
+
+
3
5
3
5
C
C
IN  
IN  
Gnd On/Off  
Gnd On/Off  
COUT  
330µF  
COUT  
330µF  
100µF  
100µF  
1N5822  
1N5822  
Note: Pin numbers are for TO-220 Package  
Note: Pin numbers are for TO-220 Package  
R2  
VOUT = 1.23 1 +  
( )  
R1  
Fixed Regulation in Typical Application  
Adjustable Regulation in Fixed Output Application  
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
M9999-051209-B  
May 2009  
1
Micrel, Inc.  
LM2575  
Ordering Information  
Part Number  
Pb-Free /  
RoHS Compliant  
Temperature Range  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
–40° to +85°C  
Package  
Standard  
LM2575BN*  
Contact Factory  
Contact Factory  
LM2575-5.0YN  
LM2575-12YN  
16-Pin Plastic DIP  
16-Pin Plastic DIP  
16-Pin Plastic DIP  
16-Pin Plastic DIP  
24-Pin Wide SOIC  
24-Pin Wide SOIC  
24-Pin Wide SOIC  
24-Pin Wide SOIC  
5-Pin TO-220  
LM2575-3.3BN  
LM2575-5.0BN  
LM2575-12BN  
LM2575BWM*  
LM2575-3.3BWM  
LM2575-5.0BWM  
LM2575-12BWM  
LM2575BT*†  
LM2575-3.3BT†  
LM2575-5.0BT†  
LM2575-12BT†  
LM2575BU*  
LM2575YWM*  
LM2575-3.3YWM  
LM2575-5.0YWM  
LM2575-12YWM  
LM2575WT*/**  
LM2575-3.3WT**  
LM2575-5.0WT**  
LM2575-12WT**  
LM2575WU*/**  
LM2575-3.3WU**  
LM2575-5.0WU**  
LM2575-12WU**  
5-Pin TO-220  
5-Pin TO-220  
5-Pin TO-220  
5-Pin TO-263  
LM2575-3.3BU  
LM2575-5.0BU  
LM2575-12BU  
5-Pin TO-263  
5-Pin TO-263  
5-Pin TO-263  
Notes:  
Adjustable output regulators.  
*
** RoHS compliant with "high-melting solder" exemption.  
†
Contact factory for bent or staggered leads option.  
M9999-051209-B  
May 2009  
2
Micrel, Inc.  
LM2575  
Pin Configuration  
5
4
3
2
ON/OFF  
FB  
5
4
3
2
1
ON/OFF  
FB  
GND  
OUT  
VIN  
GND  
OUT  
1
VIN  
5-Pin TO-220 (T)  
5-Pin TO-263 (U)  
PWR GND  
NC  
1
2
3
4
5
6
7
8
9
24 NC  
23 NC  
22 NC  
21 NC  
20 NC  
19 NC  
18 OUT  
17 OUT  
16 NC  
15 VIN  
14 VIN  
13 NC  
NC  
NC  
NC  
NC 1  
NC 2  
OUT 3  
NC 4  
GND 5  
NC 6  
FB 7  
16 VIN  
15 NC  
NC  
FB  
14 GND  
13 GND  
12 GND  
11 GND  
10 NC  
SIG GND  
NC  
ON/OFF 10  
NC 11  
PWR GND 12  
NC 8  
9 ON/OFF  
16-Pin Plastic DIP (N)  
24-Pin Wide SOIC (WM)  
M9999-051209-B  
May 2009  
3
Micrel, Inc.  
LM2575  
Absolute Maximum Ratings(1)  
Operating Ratings  
Maximum Supply Voltage (VIN) ......................................45V  
ON/OFF Pin Input Voltage. ......................–0.3V ≤ V ≤ +40V  
Output Voltage to Ground (Steady State)......................–1V  
Power Dissipation .....................................Internally Limited  
Maximum Junction Temperature................................ 150°C  
Lead Temperature (soldering, 10 sec.)...................... 260°C  
Storage Temperature (Ts) .........................–65°C to +150°C  
Minimum ESD Rating  
Supply Voltage (VIN).......................................................40V  
Junction Temperature Range (TJ).......–40°C ≤ TJ ≤ +125°C  
C = 100pF, R = 1.5kΩ..............................................2kV  
FB Pin......................................................................1kV  
Electrical Characteristics  
Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating  
Temperature Range. Unless otherwise specified, VIN = 12V, and ILOAD = 200mA.  
LM2575  
Limit  
Units  
Symbol  
Parameter  
Condition  
Typ  
(Note 2)  
(Limits)  
SYSTEM PARAMETERS, ADJUSTABLE REGULATORS (Note 3) Test Circuit Figure 1  
Feedback Voltage  
Feedback Voltage LM2575  
Efficiency  
VIN = 12V , ILOAD = 0.2A  
OUT = 5V  
1.230  
V
V
1.217  
1.243  
V(min)  
V(max)  
VOUT  
0.2A ≤ ILOAD ≤ 1A, 8V ≤ VIN ≤ 40V  
VOUT = 5V  
1.230  
V
1.193/1.180  
1.267/1.280  
V(min)  
V(max)  
η
VIN = 12V, ILOAD = 1A, VOUT = 5V  
82  
%
SYSTEM PARAMETERS, 3.3V REGULATORS (Note 3) Test Circuit Figure 1  
Output Voltage  
VIN = 12V , ILOAD = 0.2A  
OUT = 3.3V  
3.3  
V
V
3.234  
3.366  
V(min)  
V(max)  
VOUT  
Output Voltage LM2575-3.3  
0.2A ≤ ILOAD ≤ 1A, 8V ≤ VIN ≤ 40V  
OUT = 3.3V  
3.3  
V
V
3.168/3.135  
3.432/3.465  
V(min)  
V(max)  
η
Efficiency  
VIN = 12V, ILOAD = 1A  
75  
%
SYSTEM PARAMETERS, 5V REGULATORS (Note 3) Test Circuit Figure 1  
Output Voltage  
VIN = 12V , ILOAD = 0.2A  
OUT = 5V  
5.0  
V
V
4.900  
5.100  
V(min)  
V(max)  
VOUT  
Output Voltage LM2575-5.0  
0.2A ≤ ILOAD ≤ 1A, 8V ≤ VIN ≤ 40V  
OUT = 5V  
5.0  
V
V
4.800/4.750  
5.200/5.250  
V(min)  
V(max)  
η
Efficiency  
VIN = 12V, ILOAD = 1A  
82  
12  
%
SYSTEM PARAMETERS, 12V REGULATORS (Note 3) Test Circuit Figure 1  
Output Voltage  
VIN = 25V , ILOAD = 0.2A  
OUT = 12V  
V
V
11.760  
12.240  
V(min)  
V(max)  
VOUT  
Output Voltage LM2575-12  
Efficiency  
0.2A ≤ ILOAD ≤ 1A, 15V ≤ VIN ≤ 40V  
OUT = 12V  
12  
88  
V
V
11.520/11.400  
12.480/12.600  
V(min)  
V(max)  
η
VIN = 25V, ILOAD = 1A  
%
M9999-051209-B  
May 2009  
4
Micrel, Inc.  
LM2575  
LM2575  
Limit  
Units  
Symbol  
Parameter  
Condition  
Typ  
50  
(Note 2)  
(Limits)  
DEVICE PARAMETERS, ADJUSTABLE REGULATOR  
IB Feedback Bias Current VOUT = 5V  
DEVICE PARAMETERS, FIXED and ADJUSTABLE REGULATORS  
100/500  
nA  
fO  
Oscillator Frequency  
52  
kHz  
47/42  
58/63  
kHz(min)  
kHz(max)  
VSAT  
DC  
ICL  
Saturation Voltage  
Max Duty Cycle (ON)  
Current Limit  
I
OUT = 1A (Note 4)  
0.9  
98  
V
1.2/1.4  
V(max)  
(Note 5)  
%
%(max)  
93  
Peak Current, tON ≤ 3µs (Note 4)  
2.2  
A
1.7/1.3  
3.0/3.2  
A(min)  
A(max)  
IL  
Output Leakage Current  
VIN = 40V, (Note 6),  
Output = 0V  
Output = –1V  
Output = –1V  
2
mA(max)  
mA  
mA(max)  
75  
5
(Note 6)  
(Note 6)  
30  
IQ  
Quiescent Current  
mA  
10  
mA(max)  
ISTBY  
Standby Quiescent Current  
Thermal Resistance  
ON/OFF Pin = 5V (OFF)  
50  
µA  
µA(max)  
200  
θJA  
θJA  
θJC  
θJA  
θJA  
T Package, Junction to Ambient (Note 7)  
T Package, Junction to Ambient (Note 8)  
T Package, Junction to Case  
65  
45  
2
°C/W  
N Package, Junction to Ambient (Note 9)  
WM Package, Junction to Ambient (Note 9)  
85  
100  
ON/OFF CONTROL, FIXED and ADJUSTABLE REGULATORS Test Circuit Figure 1  
VIH  
VIL  
ON/OFF Pin Logic  
Input Level  
V
OUT = 0V  
1.4  
1.2  
2.2/2.4  
1.0/0.8  
V(min)  
V(max)  
VOUT = 5V  
IIH  
ON/OFF Pin Logic  
Current  
ON /OFF Pin = 5V (OFF)  
4
µA  
µA(max)  
30  
10  
IIL  
ON /OFF Pin = 0V (ON)  
0.01  
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.  
M9999-051209-B  
May 2009  
5
Micrel, Inc.  
LM2575  
Test Circuits and Layout Guidelines  
FEEDBACK  
+V  
IN  
4
2
V
OUT  
LM2575  
L1  
C
C
— 100µF, 75V Aluminum Electrolytic  
IN  
5.00V  
OUTPUT  
1
— 470µF, 15V Aluminum Electrolytic  
OUT  
D1 — Schottky, MBR360  
L1 — 330µH, 415-0926 (AIE)  
R1 — 1k, 0.01%  
7V - 40V  
UNREGULATED  
DC INPUT  
330µH  
+
100µF  
+
R2  
R1  
C
L
GND  
3
ON/OFF  
5
OUT  
470µF  
O
A
D
D1  
MBR360  
R2 — 3.065k, 0.01%  
C
IN  
5-pin TO-220 socket—2936 (Loranger Mfg. Co.)  
4-pin TO-3 socket—8112-AG7 (Augat Inc.)  
FEEDBACK  
+V  
IN  
4
2
V
OUT  
LM2575-5.0  
L1  
C
C
— 100µF, 75V Aluminum Electrolytic  
IN  
5.00V  
OUTPUT  
1
— 330µF, 15V Aluminum Electrolytic  
OUT  
D1 — Schottky,MBR360  
7V - 40V  
UNREGULATED  
DC INPUT  
330µH  
+
100µF  
L1 — 330µH, 415-0926 (AIE)  
+
C
L
GND  
3
ON/OFF  
5
OUT  
220µF  
5-pin TO-220 socket — 2936 (Loranger Mfg. Co.)  
4-pin TO-3 socket — 8112-AG7 (Augat Inc.)  
O
A
D
D1  
MBR360  
C
IN  
Note: Pin numbers are for TO-220 Package  
Figure 1.  
As in any switching regulator, layout is very important.  
Rapidly switching currents associated with wiring  
inductance generate voltage transient switch can cause  
problems. For minimal stray inductance and ground  
loops, the length of the leads indicated by heavy lines  
should be kept as short as possible. Single-point  
grounding (as indicated) or ground plane construction  
should be used for best results.  
M9999-051209-B  
May 2009  
6
Micrel, Inc.  
LM2575  
Typical Characteristics (circuit of Figure 1)  
Supply Current  
vs. Duty Cycle  
Standby  
Quiescent Current  
Supply Current  
20  
18  
20.0  
17.5  
200  
150  
Measured at  
Ground Pin  
V
= 40V  
IN  
T
J
OUT  
16  
14  
12  
10  
8
15.0  
12.5  
10.0  
7.5  
5.0  
2.0  
0
V
= 5V  
V
= 5V  
ON/OFF  
100  
50  
0
I
= 200 mA  
LOAD  
V
= 12V  
IN  
I
to 1A  
30  
LOAD  
20  
V
from 7V to 40V  
6
IN  
4
0
10  
40  
50  
60  
0
20  
40  
60  
80  
100  
-75 -50 -25 0 25 50 75 100 125150  
INPUT VOLTAGE (V)  
DUTY CYCLE (%)  
Switch  
Saturation Voltage  
Current Limit  
Efficiency  
3
1.2  
1.0  
0.8  
100  
95  
V
= 25V  
IN  
V
= 12V  
OUT  
1A  
90  
2
1
0
-55 C  
-40 C  
85  
80  
200 mA  
200 mA  
1A  
25 C  
75  
70  
65  
60  
V
= 3V  
0.6 125 C  
150 C  
OUT  
0.4  
-75 -50 -25  
0
25 50 75 100125 150  
0
0.2  
0.4  
0.6  
0.8  
1.0  
0
5
10 15 20 25 30 35 40  
INPUT VOLTAGE (V)  
SWITCH CURRENT (A)  
Minimum Operating  
Voltage  
Line Regulation  
Feedback Pin Current  
5.0  
4.5  
14  
12  
100  
75  
Normalized toV = 10V  
IN  
V
= 5V  
OUT  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
10  
8
I
= 500mA  
50  
25  
LOAD  
T
= 25  
J
6
4
0
2
-25  
-50  
-75  
-100  
0
V
= 1.23V  
OUT  
= 200 mA  
-2  
-4  
I
LOAD  
0.5  
0
-75 -50 -25  
-6  
0
25 50 75 100125150  
0
5
10  
15  
20  
25  
30  
-75 -50 -25  
0
25 50 75 100 125150  
INPUT VOLTAGE (V)  
Normalized  
Output Voltage  
Oscillator Frequency  
Dropout Voltage  
2.0  
1.5  
1.0  
100  
75  
+8  
+6  
V
IN  
= 12V  
Normalized at 25C  
V
OUT  
= 5%  
I
= 200mA  
R
= 0.2  
IND  
LOAD  
I
= 1A  
LOAD  
Normalized toT = 25 C  
J
+4  
+2  
0
50  
25  
0
-25  
-50  
-2  
-4  
--6  
-8  
V
= 40V  
I
= 200 mA  
LOAD  
IN  
0.5  
0
-75  
V
= 12V  
IN  
-100  
-75 -50 -25  
0
25 50 75 100125150  
-75 -50 -25 0 25 50 75 100125150  
-75 -50 -25  
0
25 50 75 100125150  
M9999-051209-B  
May 2009  
7
Micrel, Inc.  
LM2575  
Typical Characteristics (continued)  
Normalized  
Feedback Voltage*  
25  
Feedback Voltage  
vs Duty Cycle*  
20  
15  
10  
5
I
= 200 mA  
V
= 12V  
LOAD  
IN  
LOAD  
Normalized toT = 25 C  
20  
15  
I
= 200mA  
J
10  
5
V
= 40V  
IN  
0
0
-5  
-10  
-5  
V
= 7V  
IN  
-10  
-15  
-15  
-20  
-20  
-25  
-75 -50 -25  
0
20  
40  
60  
80  
100  
0
25 50 75 100125150  
DUTY CYCLE (%)  
* Adjustable version only  
M9999-051209-B  
May 2009  
8
Micrel, Inc.  
LM2575  
Functional Characteristics (circuit of Figure 1)  
Load Transient Response  
Switching Waveforms  
+100mV  
Output  
A
B
10V  
0
0
Voltage  
Change  
–100mV  
1A  
0
1A  
.5A  
0
C
D
1.0A  
0.5A  
0
Output  
Current  
100µs/div.  
V
= 5V  
V
= 5V V = 20V  
OUT IN  
OUT  
A: Output pin voltage 10V/div  
B: Output pin current 1A/div  
C: Inductor current 0.5A/div  
D: Output ripple voltage 20 mV/div. AC coupled  
Horizontal Time Base: 5µs/div  
Functional Diagrams  
INTERNAL  
V
IN  
ON/OFF  
5
ON/OFF  
1
4
REGULATOR  
FB  
FIXED GAIN  
ERROR AMP  
3.1k  
1.0k  
1 AMP  
SWITCH  
COMPARATOR  
+
-
+
-
DRIVER  
2
3
OUT  
GND  
1.23V  
BAND-GAP  
REFERENCE  
52 kHz  
OSCILLATOR  
THERMAL  
SHUTDOWN  
CURRENT  
LIMIT  
RESET  
Note: Pin numbers are for the TO-220 package  
Fixed Regulator  
INTERNAL  
V
IN  
ON/OFF  
5
ON/OFF  
1
4
REGULATOR  
FIXED GAIN  
ERROR AMP  
1 AMP  
SWITCH  
FB  
COMPARATOR  
+
-
+
-
DRIVER  
2
3
OUT  
GND  
1.23V  
BAND-GAP  
REFERENCE  
52 kHz  
OSCILLATOR  
THERMAL  
RESET  
CURRENT  
LIMIT  
SHUTDOWN  
Adjustable Regulator  
M9999-051209-B  
May 2009  
9
Micrel, Inc.  
LM2575  
Package Information  
0.780  
(19.812)  
MAX  
PIN 1  
0.030-0.110  
(0.762-2.794)  
RAD  
.250±0.005  
(6.350±0.127)  
0.025±0.015  
(0.635±0.381)  
0.290-0.320  
(7.336-8.128)  
0.020  
(0.508)  
0.040  
(1.016)  
0.130±0.005  
(3.302±0.127)  
TYP  
0-10  
0.020  
MIN  
0.009-0.015  
(0.229-0.381)  
(0.508)  
0.125  
(3.175)  
MIN  
+0.025  
0.325  
0.100±0.010  
(2.540±0.254)  
0.018±0.003  
(0.457±0.076)  
–0.015  
+0.635  
–0.381  
8.255  
(
)
16-Pin Plastic DIP (N)  
24-Pin Wide SOIC (WM)  
M9999-051209-B  
May 2009  
10  
Micrel, Inc.  
LM2575  
5-Pin TO-220 (T)  
5-Pin TO-263 (T)  
M9999-051209-B  
May 2009  
11  
Micrel, Inc.  
LM2575  
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA  
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com  
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its  
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.  
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product  
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant  
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A  
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully  
indemnify Micrel for any damages resulting from such use or sale.  
© 2000 Micrel, Incorporated.  
M9999-051209-B  
May 2009  
12  

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