IC REG SW 3A 5V STEPDOWN TO220-5

LM2576T-005G

Manufacturer Part NumberLM2576T-005G
DescriptionIC REG SW 3A 5V STEPDOWN TO220-5
ManufacturerON Semiconductor
TypeStep-Down (Buck)
LM2576T-005G datasheet
 


Specifications of LM2576T-005G

Internal Switch(s)YesSynchronous RectifierNo
Number Of Outputs1Voltage - Output5V
Current - Output3AFrequency - Switching52kHz
Voltage - Input7 ~ 40 VOperating Temperature-40°C ~ 125°C
Mounting TypeThrough HolePackage / CaseTO-220-5 (Straight Leads)
Output Voltage5 VOutput Current3 A
Input Voltage4.75 V to 40 VSwitching Frequency52 KHz
Operating Temperature Range- 40 C to + 125 CMounting StyleThrough Hole
Duty Cycle (max)98 %Lead Free Status / RoHS StatusLead free / RoHS Compliant
Power - Output-Other namesLM2576T-005G
LM2576T-005GOS
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LM2576
3.0 A, 15 V, Step−Down
Switching Regulator
The LM2576 series of regulators are monolithic integrated circuits
ideally suited for easy and convenient design of a step−down
switching regulator (buck converter). All circuits of this series are
capable of driving a 3.0 A load with excellent line and load regulation.
These devices are available in fixed output voltages of 3.3 V, 5.0 V,
12 V, 15 V, and an adjustable output version.
These regulators were designed to minimize the number of external
components to simplify the power supply design. Standard series of
inductors optimized for use with the LM2576 are offered by several
different inductor manufacturers.
Since the LM2576 converter is a switch−mode power supply, its
efficiency is significantly higher in comparison with popular
three−terminal linear regulators, especially with higher input voltages.
In many cases, the power dissipated is so low that no heatsink is
required or its size could be reduced dramatically.
A standard series of inductors optimized for use with the LM2576
are available from several different manufacturers. This feature
greatly simplifies the design of switch−mode power supplies.
The LM2576 features include a guaranteed ±4% tolerance on output
voltage within specified input voltages and output load conditions, and
±10% on the oscillator frequency (±2% over 0°C to 125°C). External
shutdown is included, featuring 80 mA (typical) standby current. The
output switch includes cycle−by−cycle current limiting, as well as
thermal shutdown for full protection under fault conditions.
Features
3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
Adjustable Version Output Voltage Range, 1.23 to 37 V ±4%
Maximum Over Line and Load Conditions
Guaranteed 3.0 A Output Current
Wide Input Voltage Range
Requires Only 4 External Components
52 kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability, Low Power Standby Mode
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current Limit Protection
Moisture Sensitivity Level (MSL) Equals 1
Pb−Free Packages are Available
Applications
Simple High−Efficiency Step−Down (Buck) Regulator
Efficient Pre−Regulator for Linear Regulators
On−Card Switching Regulators
Positive to Negative Converter (Buck−Boost)
Negative Step−Up Converters
Power Supply for Battery Chargers
© Semiconductor Components Industries, LLC, 2006
January, 2006 − Rev. 8
http://onsemi.com
1
5
Heatsink surface connected to Pin 3
1
5
Pin
1
5
Heatsink surface (shown as terminal 6 in
case outline drawing) is connected to Pin 3
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 24 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 25 of this data sheet.
1
TO−220
TV SUFFIX
CASE 314B
TO−220
T SUFFIX
CASE 314D
1. V
in
2. Output
3. Ground
4. Feedback
5. ON/OFF
2
D
PAK
D2T SUFFIX
CASE 936A
Publication Order Number:
LM2576/D

LM2576T-005G Summary of contents

  • Page 1

    LM2576 3 Step−Down Switching Regulator The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step−down switching regulator (buck converter). All circuits of this series are capable of driving ...

  • Page 2

    Typical Application (Fixed Output Voltage Versions) 7.0 V − Unregulated DC Input 100 mF Representative Block Diagram and Typical Application +V Unregulated in DC Input Feedback R2 Fixed Gain Error Amplifier R1 1.0 k ...

  • Page 3

    OPERATING RATINGS (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.) Rating Operating Junction Temperature Range Supply Voltage SYSTEM ...

  • Page 4

    DEVICE PARAMETERS ELECTRICAL CHARACTERISTICS for the 12 V version, and for the 15 V version operating junction temperature range that applies [Note 2], unless otherwise noted.) Characteristics ALL OUTPUT VOLTAGE VERSIONS Feedback Bias Current ...

  • Page 5

    TYPICAL PERFORMANCE CHARACTERISTICS 1 0 500 mA Load 0.6 Normalized 25°C J 0.4 0.2 0 −0.2 −0.4 −0.6 −0.8 −1.0 −50 − JUNCTION TEMPERATURE (°C) ...

  • Page 6

    TYPICAL PERFORMANCE CHARACTERISTICS 200 180 160 T = 25°C 140 J 120 100 INPUT VOLTAGE (V) in Figure 8. Standby Quiescent Current 8.0 6 ...

  • Page 7

    TYPICAL PERFORMANCE CHARACTERISTICS ms/DIV Figure 13. Switching Waveforms Vout = Output Pin Voltage, 10 V/DIV B: Inductor Current, 2.0 ...

  • Page 8

    V − Unregulated 100 mF DC Input 7.0 V − Unregulated 100 mF DC Input As in any switching regulator, the layout of the printed circuit board is very ...

  • Page 9

    PIN FUNCTION DESCRIPTION Pin Symbol 1 V This pin is the positive input supply for the LM2576 step−down switching regulator. In order to minimize voltage in transients and to supply the switching currents needed by the regulator, a suitable input ...

  • Page 10

    Procedure (Fixed Output Voltage Version) In order to simplify the switching regulator design, a step−by−step design procedure and some examples are provided. Procedure Given Parameters Regulated Output Voltage (3 out ...

  • Page 11

    Procedure (Fixed Output Voltage Version) (continued)In order to simplify the switching regulator design, a step−by−step design procedure and some examples are provided. Procedure 5. Output Capacitor Selection (C ) out A. Since the LM2576 is a forward−mode switching regulator with ...

  • Page 12

    Procedure (Adjustable Output Version: LM2576−ADJ) (continued) Procedure 4. Inductor Selection (L1) A. Use the following formula to calculate the inductor Volt x microsecond [V x ms] constant: V out – V out in ...

  • Page 13

    LM2576 Series Buck Regulator Design Procedures Indicator Value Selection Guide (For Continuous Mode Operation) 60 L680 40 L470 20 15 L330 10 L220 8.0 L150 7.0 L100 L68 6.0 5.0 0.3 0.4 0.5 0.6 0.8 1.0 1 MAXIMUM ...

  • Page 14

    ... MBRD340 50 V MBR350 SK35 31DQ05 30WQ05 SR305 60 V MBR360 MBRS360T3 DQ06 MBRD360 SR306 NOTE: Diodes listed in bold are available from ON Semiconductor. Table 2. Inductor Selection by Manufacturer’s Part Number Inductor Inductor Code Value 47 mH L47 68 mH L68 100 mH L100 150 mH L150 ...

  • Page 15

    Table 3. Example of Several Inductor Manufacturers Phone/Fax Numbers Pulse Engineering, Inc. Pulse Engineering, Inc. Europe Renco Electronics, Inc. Tech 39 Schott Corporation Input Capacitor ( The Input Capacitor Should Have a Low ESR For stable operation of ...

  • Page 16

    Catch Diode Locate the Catch Diode Close to the LM2576 The LM2576 is a step−down buck converter; it requires a fast diode to provide a return path for the inductor current when the switch turns off. This diode must be ...

  • Page 17

    When multiple switching regulators are located on the same printed circuit board, open core magnetics can cause interference between two or more of the regulator circuits, especially at high currents due to mutual coupling. A toroid, pot core or E−core ...

  • Page 18

    If improvements are needed, double sided or multilayer PC boards with large copper areas should be considered. In order to achieve the best thermal performance highly recommended to ...

  • Page 19

    This circuit configuration is able to deliver approximately 0 the output when the input voltage higher. At lighter loads the minimum input voltage required drops to approximately 4.7 V, because the buck−boost regulator topology ...

  • Page 20

    Shutdown +V Off Input 5 LM2576− 100 mF Q1 2N3906 5 ON/OFF NOTE: This picture does not show the complete circuit. Figure 29. Inverting Buck−Boost Regulator ...

  • Page 21

    100 1N5242B Q1 2N3904 NOTE: This picture does not show the complete circuit. Figure 32. Undervoltage Lockout Circuit for Buck Converter ...

  • Page 22

    THE LM2576−5 STEP−DOWN VOLTAGE REGULATOR WITH 5 3.0 A OUTPUT POWER CAPABILITY. TYPICAL APPLICATION WITH THROUGH−HOLE PC BOARD LAYOUT Unregulated DC Input + 100 mF /50 V GND in Figure 35. ...

  • Page 23

    THE LM2576−ADJ STEP−DOWN VOLTAGE REGULATOR WITH 8 1.0 A OUTPUT POWER CAPABILITY. TYPICAL APPLICATION WITH THROUGH−HOLE PC BOARD LAYOUT 4 Unregulated +V DC Input in LM2576−ADJ ...

  • Page 24

    ... LM2576TV−3.3G LM2576T−3.3 LM2576T−3.3G 3.3 V LM2576D2T−3.3 LM2576D2T−3.3G LM2576D2TR4−3.3 LM2576D2TR4−3.3G LM2576TV−005 LM2576TV−5G LM2576T−005 LM2576T−005G 5.0 V LM2576D2T−005 LM2576D2T−005G LM2576D2TR4−005 LM2576D2TR4−5G LM2576TV−012 LM2576TV−012G LM2576T−012 LM2576T−012G 12 V LM2576D2T−012 LM2576D2T− ...

  • Page 25

    ... Nominal Output Voltage Device LM2576TV−015 LM2576TV−015G LM2576T−015 15 V LM2576T−15G LM2576D2T−015 LM2576D2T−15G †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. TO−220 TV SUFFIX ...

  • Page 26

    B −P− OPTIONAL Q CHAMFER 0.24 (0.610 0.10 (0.254 −Q− DETAIL A− 0.356 (0.014) M ...

  • Page 27

    ... OPTIONAL A CHAMFER 0.010 (0.254 10.66 0.42 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. LM2576 PACKAGE DIMENSIONS 2 D PAK D2T SUFFIX CASE 936A−02 ISSUE C −T− TERMINAL SOLDERING FOOTPRINT* 8 ...

  • Page 28

    ... Fax: 480−829−7709 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com LM2576 N. American Technical Support: 800−282−9855 Toll Free USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051 Phone: 81−3−5773−3850 http://onsemi.com 28 ON Semiconductor Website: http://onsemi ...