NCV2574DW-ADJR2 データシートの表示（PDF） - ON Semiconductor

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NCV2574DW-ADJR2

0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator

ON Semiconductor 

LM2574, NCV2574

0.5 A, Adjustable Output

Voltage, Step-Down

Switching Regulator

The LM2574 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 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.

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 LM2574 are offered by several

different inductor manufacturers.

Since the LM2574 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 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.

The LM2574 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 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

• 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

over Line and Load Conditions

• 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

www.onsemi.com

16

1

8

1

SO−16 WB

DW SUFFIX

CASE 751G

PDIP−8

N SUFFIX

CASE 626

PIN CONNECTIONS

*1

*2

FB 3

Sig Gnd 4

ON/OFF 5

Pwr Gnd 6

*7

*8

16 *

15 *

14 Output

13 *

12 Vin

11 *

10 *

9*

(Top View)

FB 1

Sig Gnd 2

ON/OFF 3

Pwr Gnd 4

8*

7 Output

6*

5 Vin

(Top View)

* No internal connection, but should be soldered to

* PC board for best heat transfer.

and Control Changes

• Pb−Free Packages are Available*

Applications

• 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

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 24 of this data sheet.

*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, 2015

1

January, 2015 − Rev. 9

Publication Order Number:

LM2574/D

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