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

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Bay Linear

Inspire the Linear Power

LM2576

3.0A Step Down Switching voltage Regulator

Adjustable & Fix Output

 

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

 

 

PIN CONNECTIONS

 

 

 

 

 

 

 

 

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.

TO-263-5 Package

BAY

B2576

1 2 3 4 5

Top View

TO-220-5 Package

BAY

B2576

1)

 

VIN

2

 

3

 

4

5

 

 

 

 

 

1

 

 

 

1)

VIN

2)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT

 

 

 

 

 

 

 

 

 

2)

 

VOUT

3)

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3)

 

GND

4)

 

FB

 

 

 

 

 

 

 

 

 

 

4)

 

FB

5)

 

ON/OFF

 

 

 

 

 

 

 

 

 

5)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON/OFF

 

 

 

 

 

 

 

 

Top View

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

 

 

 

 

 

 

 

 

 

 

LM2576

 

 

Absolute Maximum Rating

 

 

 

 

 

 

 

 

 

 

 

Parameter

 

Symbol

 

 

Value

 

 

Unit

 

 

Maximum Input Voltage

 

VIN

45

 

 

V

 

 

Power Dissipation

 

PO

 

Internally Limited

 

W

 

 

Off Pin Input Voltage

 

 

 

-0.3V<V<VIN

 

 

 

 

Output Voltage

 

 

-1

 

 

V

 

 

Supply Voltage

 

 

40

 

 

V

 

 

Operating Junction

 

 

 

 

 

 

 

 

 

 

 

Temperature Range

 

TJ

 

 

 

 

 

 

 

 

 

Control Section

 

 

-40<TJ<85

 

 

 

 

 

 

 

 

 

 

 

Power Transistor

 

 

 

 

°C

 

 

 

 

 

 

 

 

 

 

 

 

Storage Temperature Range

 

TSTG

 

-65 to 150

 

 

 

 

Lead Temperature (Soldering 10

 

TLEAD

260

 

 

 

 

 

Sec.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ELECTRICAL CHARACTERISTICS TA = 25°C VIN = 12V, ILOAD= 100mA unless otherwise specified. Boldface type applies over full Operating Temperature Range.

 

Parameter

Conditions

 

LM2576

 

 

 

Units

 

 

 

Typ

Min

Max

 

 

 

 

 

 

 

 

 

 

 

 

Adjustable Regulators (Note 3)(Note 8)

 

 

 

 

 

 

 

 

VIN = 12V, ILOAD = 0.5A, VOUT = 5V

1.230

1.217

1.243

 

 

V

 

Output Voltage (VOUT)

 

 

 

 

 

 

 

 

0.5A ILOAD 3A, 6VVIN 40V, VOUT

1.230

1.193

1.267

 

 

V

 

 

=5V

1.230

1.180

1.280

 

 

 

 

 

 

 

 

Efficiency (Note 7)

VIN = 12V, ILOAD = 3A, VOUT = 5V

82

 

 

 

%

 

3.3V Version (Note 3)(Note 9)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIN = 12V, ILOAD = 0.5A, VOUT = 3.3V

3.3

3.234

3.366

 

 

V

 

Output Voltage (VOUT)

0.5A ILOAD 3A, 6V VIN 40V,

3.3

3.168

3.432

 

 

V

 

 

VOUT = 3.3V

3.3

3.135

3.465

 

 

 

 

 

 

 

 

Efficiency

VIN = 12V, ILOAD = 3A

75

 

 

 

%

 

5V Version (Note 3)(Note 9)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIN = 12V, ILOAD = 0.5A, VOUT = 5V

5.0

4.900

5.100

 

 

V

 

Output Voltage (VOUT)

0.5A ILOAD 3A, 8V VIN 40V,

5.0

4.800

5.200

 

 

V

 

 

VOUT = 5V

5.0

4.750

5.250

 

 

 

 

 

 

 

 

Efficiency (Note 7)

VIN = 12V, ILOAD = 3A, VOUT = 5V

82

 

 

 

%

 

12V Version (Note 3)(Note 9)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIN = 25V, ILOAD = 0.5A, VOUT = 12V

12

11.760

12.240

 

 

V

 

Output Voltage (VOUT)

0.5A ILOAD 3A, 15V VIN 40V,

12

11.520

12.480

 

 

V

 

 

VOUT = 12V

12

11.400

12.600

 

 

 

 

 

 

 

 

Efficiency (Note 7)

VIN = 25V, ILOAD = 3A

88

 

 

 

%

 

15V Version(Note 3)(Note 9)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output Voltage (VOUT)

VIN = 30V, ILOAD = 0.5A, VOUT = 15V

15

14.700

15.300

 

 

V

 

0.5A ILOAD 3A, 18V VIN 40V,

15

14.400

15.600

 

 

V

 

 

VOUT = 15V

15

14.250

15.750

 

 

 

 

 

 

 

 

Efficiency (Note 7)

VIN = 30V, ILOAD = 3A

88

 

 

 

%

 

 

 

 

 

 

 

 

 

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

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

LM2576

ELECTRICAL CHARACTERISTICS TA = 25°C VIN = 12V, ILOAD= 100mA unless otherwise specified. Boldface type applies over full Operating Temperature Range.

 

Parameters

 

 

Conditions

 

 

 

 

 

LM2576

 

 

 

 

 

Units

 

 

 

 

 

 

Typ

 

 

Min

 

 

Max

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Adjustable Regulator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Feedback Bias Current

 

VOUT = 5V

50

 

 

 

 

100

 

 

nA

 

 

 

 

 

 

500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fixed and Adjustable Regulators

 

 

 

 

 

 

 

 

 

 

 

 

 

Oscillator Frequency

 

 

 

52

 

47

 

58

 

 

kHz

 

 

 

 

 

42

 

63

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Saturation Voltage

 

IOUT = 0.5A, (Note 4)

1.4

 

 

 

 

1.8

 

 

V

 

 

 

 

 

 

2.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max Duty Cycle

 

(Note 5)

98

 

93

 

 

 

 

%

 

 

Current Limit

Peak Current, tON3µs, (Note 4)

5.8

 

4.2

 

6.9

 

 

A

 

 

3.5

 

7.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output Leakage Current

VIN, (Note 6), Output = 0V

 

 

 

 

 

 

2

 

 

mA

 

(Note 6 ), Output = -1V

7.5

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Quiescent Current

(Note 6)

5

 

 

 

 

10

 

 

mA

 

Standby Quiescent Current

ON/OFF Pin = 5V (OFF)

50

 

 

 

 

200

 

 

µA

 

 

 

T,U package, Junction to Ambient,

65

 

 

 

 

 

 

 

 

 

 

 

Thermal Resistance

(Note 7)

 

 

 

 

 

 

 

 

°C/W

 

2

 

 

 

 

 

 

 

 

 

 

 

T,U package, Junction to case

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF Input Level

VOUT = 0V

1.4

 

2.2

 

 

 

 

 

V

 

 

2.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON Input Level

VOUT = 15V or 5V

1.2

 

 

 

 

1.0

 

 

V

 

 

 

 

 

0.8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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.

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

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