Bay Linear LM2576T-15, LM2576T-5, LM2576T-3.3, LM2576T-ADJ, LM2576J-12 Datasheet

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

PIN CONNECTIONS

3.0A Step Down Switching voltage Regulator

LM2576

Adjustable & Fix Output

Pin Connection

Ordering Information

Devices Package Temp.

LM2576T-X TO-220

-40 °C to 125 °C

LM2576S-X TO-263

-40°C to 125 °C

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.

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

TO-263-5 Package

Top View

45

BAY

B2576

GND

V

OUT

V

IN

1)

3)

4)

5)FBON/OFF

2)

1

2

3

TO-220-5 Package

Top View

GND

V

OUT

VIN1)

3)

4)

5)

2)

FB

ON/OFF

54321

BAY

B2576

Bay Linear

Inspire the Linear Power

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

LM2576

Absolute Maximum Rating

Parameter Symbol Value Unit

Maximum Input Voltage V

IN

45 V

Power Dissipation P

O

Internally Limited W

Off Pin Input Voltage

-0.3V<V<V

IN

Output Voltage

-1 V

Supply Voltage

40 V
Operating Junction
Temperature Range
Control Section
Power Transistor

T

J

-40<TJ<85

Storage Temperature Range T

STG

-65 to 150
Lead Temperature (Soldering 10
Sec.)

T

LEAD

260

°C

ELECTRICAL CHARACTERISTICS

T

A

= 25°C VIN = 12V, I

LOAD

= 100mA unless otherwise specified.

Boldface type applies over full Operating Temperature Range

.

Parameter Conditions LM2576

Typ Min Max

Units

Adjustable Regulators

(

Note 3)(Note 8

)

VIN = 12V, I

LOAD

= 0.5A, V

OUT

= 5V 1.230 1.217 1.243 V

Output Voltage (V

OUT

)

0.5A ≤ I

LOAD

≤ 3A, 6V≤ V

IN

≤ 40V, V

OUT

=

5V

1.230

1.230

1.193

1.180

1.267

1.280

V

Efficiency (Note 7) VIN = 12V, I

LOAD

= 3A, V

OUT

= 5V 82 %

3.3V Version (Note 3)(Note 9)

VIN = 12V, I

LOAD

= 0.5A, V

OUT

= 3.3V 3.3 3.234 3.366 V

Output Voltage (V

OUT

)

0.5A ≤ I

LOAD

≤

3A, 6V ≤ VIN ≤ 40V,

V

OUT

= 3.3V

3.3

3.3

3.168

3.135

3.432

3.465

V

Efficiency VIN = 12V, I

LOAD

= 3A 75 %

5V Version (Note 3)(Note 9)

VIN = 12V, I

LOAD

= 0.5A, V

OUT

= 5V 5.0 4.900 5.100 V

Output Voltage (V

OUT

)

0.5A ≤ I

LOAD

≤

3A, 8V ≤ VIN ≤ 40V,

V

OUT

= 5V

5.0

5.0

4.800

4.750

5.200

5.250

V

Efficiency (Note 7) VIN = 12V, I

LOAD

= 3A, V

OUT

= 5V 82 %

12V Version (Note 3)(Note 9)

VIN = 25V, I

LOAD

= 0.5A, V

OUT

= 12V 12 11.760 12.240 V

Output Voltage (V

OUT

)

0.5A ≤ I

LOAD

≤

3A, 15V ≤ VIN ≤ 40V,

V

OUT

= 12V

12

12

11.520

11.400

12.480

12.600

V

Efficiency (Note 7) VIN = 25V, I

LOAD

= 3A 88 %

15V Version(Note 3)(Note 9)

VIN = 30V, I

LOAD

= 0.5A, V

OUT

= 15V 15 14.700 15.300 V

Output Voltage (V

OUT

)

0.5A ≤ I

LOAD

≤ 3A, 18V ≤ VIN ≤ 40V,

V

OUT

= 15V

15

15

14.400

14.250

15.600

15.750

V

Efficiency (Note 7) VIN = 30V, I

LOAD

= 3A 88 %

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

LM2576

ELECTRICAL CHARACTERISTICS TA = 25°C VIN = 12V, I

LOAD

= 100mA unless otherwise specified.

Boldface type applies over full Operating Temperature Range.

Parameters Conditions

Typ

LM2576

Min

Max

Units

Adjustable Regulator

Feedback Bias Current V

OUT

= 5V 50

100

500

nA

Fixed and Adjustable Regulators

Oscillator Frequency 52

47

42

58

63

kHz

Saturation Voltage I

OUT

= 0.5A, (Note 4) 1.4

1.8

2.0

V

Max Duty Cycle (Note 5) 98 93 %

Current Limit

Peak Current, t

ON

≤ 3µs, (Note 4)

5.8

4.2

3.5

6.9

7.5

A

Output Leakage Current

V

IN

, (Note 6), Output = 0V

(Note 6 ), Output = -1V

7.5

2

30

mA

Quiescent Current (Note 6) 5 10 mA
Standby Quiescent Current ON/OFF Pin = 5V (OFF) 50 200

µA

Thermal Resistance

T,U package, Junction to Ambient,
(Note 7)
T,U package, Junction to case

65

2

°C/W

ON/OFF Control, Fixed & Adjustable Regulators (Note 8) (Note9)

OFF Input Level V

OUT

= 0V 1.4

2.2

2.4

V

ON Input Level V

OUT

= 15V or 5V 1.2

1.0

0.8

V

OFF Logic Current ON/OFF Pin = 5V (OFF) 4 30

µA

ON Logic Current ON/OFF Pin = 0V (ON) 0.01 10

µA

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.