LM2576D2T-3.3G ON Semiconductor, LM2576D2T-3.3G Datasheet

IC REG SW 3A 3.3V STEPDOWN D2PAK

LM2576D2T-3.3G

Manufacturer Part Number
LM2576D2T-3.3G
Description
IC REG SW 3A 3.3V STEPDOWN D2PAK
Manufacturer
ON Semiconductor
Type
Step-Down (Buck)r
Datasheet

Specifications of LM2576D2T-3.3G

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.3V
Current - Output
3A
Frequency - Switching
52kHz
Voltage - Input
7 ~ 40 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
D²Pak, TO-263 (5 leads + tab)
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM2576D2T-3.3G
Manufacturer:
ON Semiconductor
Quantity:
147
LM2576
3.0 A, 15 V, Step−Down
Switching Regulator
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.
components to simplify the power supply design. Standard series of
inductors optimized for use with the LM2576 are offered by several
different inductor manufacturers.
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.
are available from several different manufacturers. This feature
greatly simplifies the design of switch−mode power supplies.
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
Applications
© Semiconductor Components Industries, LLC, 2006
January, 2006 − Rev. 8
The LM2576 series of regulators are monolithic integrated circuits
These regulators were designed to minimize the number of external
Since the LM2576 converter is a switch−mode power supply, its
A standard series of inductors optimized for use with the LM2576
The LM2576 features include a guaranteed ±4% tolerance on output
Maximum Over Line and Load Conditions
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%
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
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
1
See detailed ordering and shipping information in the package
dimensions section on page 24 of this data sheet.
See general marking information in the device marking
section on page 25 of this data sheet.
Heatsink surface (shown as terminal 6 in
case outline drawing) is connected to Pin 3
DEVICE MARKING INFORMATION
1
1
1
Heatsink surface connected to Pin 3
ORDERING INFORMATION
5
5
http://onsemi.com
5
Pin
1. V
2. Output
3. Ground
4. Feedback
5. ON/OFF
Publication Order Number:
in
D2T SUFFIX
CASE 936A
CASE 314D
T SUFFIX
CASE 314B
TV SUFFIX
TO−220
D
TO−220
2
PAK
LM2576/D

Related parts for LM2576D2T-3.3G

LM2576D2T-3.3G 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

... 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−012G LM2576D2TR4−012 LM2576D2TR4−012G †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 ...

Page 25

... 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 CASE 314B LM 2576T−xxx ...

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 ...

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