Bay Linear
Inspire the Linear Power |
LM2576 |
3.0A Step Down Switching voltage Regulator |
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Adjustable & Fix Output |
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Description
The Bay Linear LM2576 contains fixed and adjustable switching voltage regulators that require a minimum of external components. All circuitry necessary to build a buck-switching regulator is included.
The LM2576 is available in 3.3V; 5V, 12V & 15V fixed voltages, or an adjustable version with an output voltage range from 1.23V to 37V. The guaranteed accuracy for specified input and load conditions is ±4%.
The LM2576 can supply 3A with an excellent load and line regulation. Protection such as cycle-by-cycle current limiting or thermal shutdown has been designed. In standby mode, the current consumption has been minimized (200µA).
For 1A step-down switching regulators refer to B2575 data sheets
Features
•Guaranteed 3A Output Current
•High Efficiency
•Wide Input Voltage, up to 40V
•3.3V, 5V, 12V, 15V and Adjustable Output Versions
•Thermal Shutdown and Current Limit Protection
•Requires only 4 External Components
•Low Power Standby Mode < 200µA Typical
•Shutdown Capability (Standby Mode)
•52kHz Fixed Frequency Internal Oscillator
•Uses Standard Inductors
•Pin-to-Pin Compatible with LM2576
Applications
•Efficient Pre-Regulator for Linear Regulators
•On-card Switching Regulators
•Positive to Negative Converter (Buck-Boost)
•Simple High-efficiency Step-down (Buck)
•Portable Instruments
Pin Connection |
Ordering Information |
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PIN CONNECTIONS |
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Devices |
Package |
Temp. |
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LM2576T-X |
TO-220 |
-40 °C to 125 °C |
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LM2576S-X |
TO-263 |
-40°C to 125 °C |
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LM2576J-X |
LPDD |
-40°C to 125 °C |
X= Output Voltage (X=3.3V, 5.0V, 12V, 15V or Blank for Adjustable)
Consult factory for other fixed voltages.
TO-263-5 Package
BAY |
B2576 |
1 2 3 4 5
Top View
TO-220-5 Package
BAY
B2576
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VIN |
2 |
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3 |
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4 |
5 |
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1 |
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VIN |
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2) |
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VOUT |
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2) |
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VOUT |
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3) |
GND |
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3) |
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GND |
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FB |
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4) |
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FB |
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5) |
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ON/OFF |
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5) |
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ON/OFF |
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Top View
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 |
www.baylinear.com |
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LM2576 |
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Absolute Maximum Rating |
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Parameter |
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Symbol |
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Value |
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Unit |
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Maximum Input Voltage |
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VIN |
45 |
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V |
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Power Dissipation |
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PO |
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Internally Limited |
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W |
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Off Pin Input Voltage |
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-0.3V<V<VIN |
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Output Voltage |
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-1 |
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V |
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Supply Voltage |
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40 |
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V |
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Operating Junction |
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Temperature Range |
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TJ |
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Control Section |
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-40<TJ<85 |
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Power Transistor |
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°C |
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Storage Temperature Range |
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TSTG |
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-65 to 150 |
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Lead Temperature (Soldering 10 |
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TLEAD |
260 |
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Sec.) |
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ELECTRICAL CHARACTERISTICS TA = 25°C VIN = 12V, ILOAD= 100mA unless otherwise specified. Boldface type applies over full Operating Temperature Range.
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Parameter |
Conditions |
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LM2576 |
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Units |
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Typ |
Min |
Max |
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Adjustable Regulators (Note 3)(Note 8) |
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VIN = 12V, ILOAD = 0.5A, VOUT = 5V |
1.230 |
1.217 |
1.243 |
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V |
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Output Voltage (VOUT) |
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0.5A ≤ ILOAD ≤ 3A, 6V≤ VIN ≤ 40V, VOUT |
1.230 |
1.193 |
1.267 |
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V |
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=5V |
1.230 |
1.180 |
1.280 |
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Efficiency (Note 7) |
VIN = 12V, ILOAD = 3A, VOUT = 5V |
82 |
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% |
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3.3V Version (Note 3)(Note 9) |
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VIN = 12V, ILOAD = 0.5A, VOUT = 3.3V |
3.3 |
3.234 |
3.366 |
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V |
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Output Voltage (VOUT) |
0.5A ≤ ILOAD ≤ 3A, 6V ≤ VIN ≤ 40V, |
3.3 |
3.168 |
3.432 |
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V |
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VOUT = 3.3V |
3.3 |
3.135 |
3.465 |
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Efficiency |
VIN = 12V, ILOAD = 3A |
75 |
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% |
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5V Version (Note 3)(Note 9) |
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VIN = 12V, ILOAD = 0.5A, VOUT = 5V |
5.0 |
4.900 |
5.100 |
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V |
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Output Voltage (VOUT) |
0.5A ≤ ILOAD ≤ 3A, 8V ≤ VIN ≤ 40V, |
5.0 |
4.800 |
5.200 |
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V |
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VOUT = 5V |
5.0 |
4.750 |
5.250 |
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Efficiency (Note 7) |
VIN = 12V, ILOAD = 3A, VOUT = 5V |
82 |
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% |
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12V Version (Note 3)(Note 9) |
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VIN = 25V, ILOAD = 0.5A, VOUT = 12V |
12 |
11.760 |
12.240 |
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Output Voltage (VOUT) |
0.5A ≤ ILOAD ≤ 3A, 15V ≤ VIN ≤ 40V, |
12 |
11.520 |
12.480 |
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V |
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VOUT = 12V |
12 |
11.400 |
12.600 |
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Efficiency (Note 7) |
VIN = 25V, ILOAD = 3A |
88 |
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15V Version(Note 3)(Note 9) |
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Output Voltage (VOUT) |
VIN = 30V, ILOAD = 0.5A, VOUT = 15V |
15 |
14.700 |
15.300 |
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0.5A ≤ ILOAD ≤ 3A, 18V ≤ VIN ≤ 40V, |
15 |
14.400 |
15.600 |
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V |
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VOUT = 15V |
15 |
14.250 |
15.750 |
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Efficiency (Note 7) |
VIN = 30V, ILOAD = 3A |
88 |
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% |
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Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 |
www.baylinear.com |
LM2576
ELECTRICAL CHARACTERISTICS TA = 25°C VIN = 12V, ILOAD= 100mA unless otherwise specified. Boldface type applies over full Operating Temperature Range.
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Parameters |
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Conditions |
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LM2576 |
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Units |
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Typ |
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Min |
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Max |
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Adjustable Regulator |
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Feedback Bias Current |
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VOUT = 5V |
50 |
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100 |
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nA |
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500 |
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Fixed and Adjustable Regulators |
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Oscillator Frequency |
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52 |
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47 |
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58 |
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kHz |
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42 |
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63 |
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Saturation Voltage |
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IOUT = 0.5A, (Note 4) |
1.4 |
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1.8 |
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V |
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2.0 |
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Max Duty Cycle |
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(Note 5) |
98 |
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93 |
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% |
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Current Limit |
Peak Current, tON≤ 3µs, (Note 4) |
5.8 |
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4.2 |
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6.9 |
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A |
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3.5 |
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7.5 |
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Output Leakage Current |
VIN, (Note 6), Output = 0V |
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2 |
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mA |
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(Note 6 ), Output = -1V |
7.5 |
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30 |
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Quiescent Current |
(Note 6) |
5 |
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10 |
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mA |
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Standby Quiescent Current |
ON/OFF Pin = 5V (OFF) |
50 |
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200 |
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µA |
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T,U package, Junction to Ambient, |
65 |
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Thermal Resistance |
(Note 7) |
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°C/W |
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2 |
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T,U package, Junction to case |
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ON/OFF Control, Fixed & Adjustable Regulators (Note 8) (Note9) |
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OFF Input Level |
VOUT = 0V |
1.4 |
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2.2 |
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V |
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2.4 |
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ON Input Level |
VOUT = 15V or 5V |
1.2 |
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1.0 |
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V |
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0.8 |
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OFF Logic Current |
ON/OFF Pin = 5V (OFF) |
4 |
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30 |
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µA |
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ON Logic Current |
ON/OFF Pin = 0V (ON) |
0.01 |
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10 |
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µA |
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Note 1: Absolute Maxium Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate test conditions for which the device s intended to be functional, but do not guarantee specific performance limits. For quaranteed specifications and test conditions see the Electrical Characteristics.
Note 2: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via testing.
Note 3: External components such as the diode, inductor and capacitor can affect the system performance. Note 4: Output (pin 2) sourcing current. No diode, inductor, or capacitor connected to input.
Note 5: Feedback (pin 4) removed from output and connected to 0V.
Note 6: Feedback (pin 4) removed from output and connected to 12V to force the output transistor OFF.
Note 7: Junction to ambient thermal resistance with approximately 1 square inches of PC board cooper surrounding the leads. Note 8: Test circuit refers to figure 2.
Note 9: Test circuit refers to figure 3.
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 |
www.baylinear.com |