LM2574N-015G ON Semiconductor, LM2574N-015G Datasheet

IC REG SW 0.5A 15V OUTPUT 8-DIP

LM2574N-015G

Manufacturer Part Number
LM2574N-015G
Description
IC REG SW 0.5A 15V OUTPUT 8-DIP
Manufacturer
ON Semiconductor
Type
Step-Down (Buck)r
Datasheet

Specifications of LM2574N-015G

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
15V
Current - Output
500mA
Frequency - Switching
52kHz
Voltage - Input
4.75 ~ 40 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Output Voltage
15 V
Output Current
0.5 A
Input Voltage
4.75 V to 40 V
Switching Frequency
52 KHz
Operating Temperature Range
- 40 C to + 125 C
Mounting Style
Through Hole
Duty Cycle (max)
98 %
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:
LM2574N-015G
Manufacturer:
ON Semiconductor
Quantity:
135
LM2574, NCV2574
0.5 A, Adjustable Output
Voltage, 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 0.5 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 LM2574 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 most cases, the power dissipated by the LM2574 regulator is so low,
that the copper traces on the printed circuit board are normally the only
heatsink needed and no additional heatsinking is required.
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 60 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
*For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
© Semiconductor Components Industries, LLC, 2006
August, 2006 − Rev. 8
Techniques Reference Manual, SOLDERRM/D.
The LM2574 series of regulators are monolithic integrated circuits
These regulators were designed to minimize the number of external
Since the LM2574 converter is a switch−mode power supply, its
The LM2574 features include a guaranteed ±4% tolerance on output
over Line and Load Conditions
and Control Changes
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% max
Guaranteed 0.5 A Output Current
Wide Input Voltage Range: 4.75 to 40 V
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
NCV Prefix for Automotive and Other Applications Requiring Site
Pb−Free Packages are Available*
Simple and High−Efficiency Step−Down (Buck) Regulators
Efficient Pre−regulator for Linear Regulators
On−Card Switching Regulators
Positive to Negative Converters (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 24 of this data sheet.
* No internal connection, but should be soldered to
*
PC board for best heat transfer.
DEVICE MARKING INFORMATION
16
8
ORDERING INFORMATION
1
Pwr Gnd
Pwr Gnd
ON/OFF
ON/OFF
Sig Gnd
Sig Gnd
PIN CONNECTIONS
1
http://onsemi.com
FB
FB
*
*
*
*
1
2
3
4
5
6
7
8
1
2
3
4
(Top View)
(Top View)
Publication Order Number:
16
15
14
13
12
11
10
9
8
7
6
5
DW SUFFIX
CASE 751G
CASE 626
N SUFFIX
SO−16 WB
PDIP−8
*
*
Output
*
V
*
*
*
*
Output
*
V
in
in
LM2574/D

Related parts for LM2574N-015G

LM2574N-015G Summary of contents

Page 1

... Negative Step−Up Converters • Power Supply for Battery Chargers *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. © Semiconductor Components Industries, LLC, 2006 August, 2006 − Rev. 8 http://onsemi ...

Page 2

Typical Application (Fixed Output Voltage Versions) 7.0 − Unregulated DC Input Representative Block Diagram and Typical Application +V in Unregulated DC Input 5 (12 (3) Feedback R2 Fixed Gain Error Amplifier ...

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

SYSTEM PARAMETERS ([Note 3] Test Circuit Figure 16) ELECTRICAL CHARACTERISTICS (continued) Adjustable version for the 12 V version min/max values T is the operating junction temperature range that applies [Note 4], unless otherwise noted). ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS 1 0 100 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 8.0 6 Normalized at 25°C 4.0 2.0 0 −2.0 −4.0 −6.0 −8.0 10 −50 − JUNCTION TEMPERATURE (°C) J Figure 8. Oscillator Frequency 5.0 4.5 Adjustable Version ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS 500 200 ms/DIV A: Output Voltage, 50 mV/DIV, AC Coupled B: 100 mA to 500 mA Load Pulse Figure 14. 500 mA Load Transient Response for Continuous Mode Operation, L ...

Page 8

V Unregulated C DC Input (12) 7.0 V − Unregulated C DC Input NOTE: Pin numbers are ...

Page 9

Pin SO−16W PDIP−8 Symbol This pin is the positive input supply for the LM2574 step−down switching regulator. In order to in minimize voltage 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 example is provided. Procedure Given Parameters Regulated Output Voltage (3 out V ...

Page 11

Procedure (Fixed Output Voltage Version) (continued) In order to simplify the switching regulator design, a step−by−step design procedure and example is provided. Procedure 5. Output Capacitor Selection (C ) out A. Since the LM2574 is a forward−mode switching regulator with ...

Page 12

Procedure (Adjustable Output Version: LM2574−ADJ) Procedure 4. Inductor Selection (L1) A. Use the following formula to calculate the inductor Volt x microsecond [V x ms] constant: V out out ) ...

Page 13

LM2574 Series Buck Regulator Design Procedures Indicator Value Selection Guide (For Continuous Mode Operation) 60 680 470 10 9.0 330 8.0 7.0 220 6.0 5.0 0.1 0.15 0.2 0 MAXIMUM LOAD CURRENT (A) L Figure ...

Page 14

... Table 1. Diode Selection Guide gives an overview about through−hole diodes for an effective design. Device listed in bold are available from ON Semiconductor Inductor Value Pulse Engineering 100 mH * 150 mH 52625 220 mH 52626 330 mH 52627 470 mH 52628 680 mH 52629 1000 mH 52631 1500 mH * 2200 Contact Manufacturer Table 3 ...

Page 15

Input Capacitor ( The Input Capacitor Should Have a Low ESR For stable operation of the switch mode converter a low ESR (Equivalent Series Resistance) aluminium or solid tantalum bypass capacitor is needed between the input pin and ...

Page 16

Inductor The magnetic components are the cornerstone of all switching power supply designs. The style of the core and the winding technique used in the magnetic component’s design have a great influence on the reliability of the overall power supply. ...

Page 17

A Inductor Current Waveform 0 A 0.5 A Power Switch Current Waveform 0 A HORIZONTAL TIME BASE: 5.0 ms/DIV Figure 24. Continuous Mode Switching Current Waveforms Output Voltage Ripple and Transients Source of the Output Ripple Since the LM2574 ...

Page 18

Since the current rating of the LM2574 is only 0.5 A, the total package power dissipation for this switcher is quite low, ranging from approximately 0 0.75 W under varying conditions carefully engineered printed circuit ...

Page 19

The high input current needed for startup is now partially supplied by the input capacitor Design Recommendations: The inverting regulator operates in a different manner than the buck converter and so a different design procedure has to ...

Page 20

The circuit in Figure 31 shows the negative boost configuration. The input voltage in this application ranges from −5.0 to −12 V and provides a regulated −12 V output. If the input voltage is greater than −12 V, the output ...

Page 21

LM2574−XX 5 (12 ON/OFF (5) Z1 1N5242 Q1 2N3904 NOTE: This picture does not show the complete circuit (see Figure 27). Figure ...

Page 22

The LM2574−5 Step−Down Voltage Regulator with 5 0.5 A Output Power Capability. Typical Application With Through−Hole PC Board Layout +V in Unregulated DC Input + Gnd Figure 36. Schematic ...

Page 23

The LM2574−ADJ Step−Down Voltage Regulator with 5 0.5 A Output Power Capability Typical Application With Through−Hole PC Board Layout Unregulated +V DC Input in LM2574−ADJ 5 (12 7 Pwr 2 Sig ...

Page 24

... NCV2574DW−ADJR2G LM2574N−3.3 3.3 V LM2574N−3.3G LM2574N−5 5.0 V LM2574N−5G LM2574N− LM2574N−12G LM2574N− LM2574N−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. ...

Page 25

16X 0. 14X −B− −A− NOTE 2 C −T− N SEATING PLANE 0.13 (0.005) M ...

Page 26

... Fax: 480−829−7709 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com LM2574, NCV2574 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 26 ON Semiconductor Website: http://onsemi ...

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