Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A

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Overview

The LM2574 Buck Switching 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 loadwith 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.

The Buck Switching Regulator is 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 many cases, the power dissipated by the LM2574 regulator is so low, that no heatsink is required or its size could be reduced dramatically.

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 0C to 125C). External shutdown is included, featuring 80 uA typical standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

  • Efficient Pre-Regulator for Linear Regulators
  • On-Card Switching Regulators
  • Power Supply for Battery Chargers
  • Simple and High-Efficiency Step-Down (Buck) Regulators

  • Automotive NCV Version Available
  • 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range of 1.23 V to 37 V +/-4%
  • Guaranteed 0.5 A Output Current
  • Wide Input Voltage Range: 4.75 V 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
  • Moisture Sensitivity Level (MSL) Equals 1

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Product

Status

ECAD Models

Compliance

Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

ON Target

Topology

Control Mode

VCC Min (V)

VCC Max (V)

VO Typ (V)

IO Typ (A)

Efficiency (%)

fSW Typ (kHz)

Pricing ($/Unit)

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LM2574N-12G

Active

Pb

A

H

P

PDIP-8

NA

0

TUBE

50

N

Step-Down

Voltage Mode

7

40

12

0.5

85

52

$1.0493

More Details

LM2574N-3.3G

Obsolete

Pb

A

H

P

PDIP-8

NA

0

TUBE

50

N

Step-Down

Voltage Mode

7

40

3.3

0.5

85

52

Price N/A

More Details

NCV2574DW-ADJR2

Obsolete

Pb

A

H

P

SOIC-16W

1

235

REEL

1000

N

Step-Down

Voltage Mode

7

40

1.23

0.5

85

52

Price N/A

More Details

NCV2574DW-ADJR2G

Last Shipments

Pb

A

H

P

SOIC-16W

3

260

REEL

1000

N

Step-Down

Voltage Mode

7

40

1.23

0.5

85

52

Price N/A

More Details

LM2574N-5G

Active

Pb

A

H

P

PDIP-8

NA

0

TUBE

50

N

Step-Down

Voltage Mode

7

40

5

0.5

85

52

$0.8433

More Details

LM2574N-ADJG

Active

Pb

A

H

P

PDIP-8

NA

0

TUBE

50

N

Step-Down

Voltage Mode

7

40

1.23

0.5

85

52

$0.8433

More Details

LM2574N-015G

Obsolete

Pb

A

H

P

PDIP-8

NA

0

TUBE

50

N

Step-Down

Voltage Mode

7

40

15

0.5

85

52

Price N/A

More Details

LM2574DW-ADJR2G

Active

Pb

A

H

P

SOIC-16W

3

260

REEL

1000

N

Step-Down

Voltage Mode

7

40

1.23

0.5

85

52

$1.0452

More Details

LM2574DW-ADJ

Obsolete

Pb

A

H

P

SOIC-16W

1

235

TUBE

47

N

Step-Down

Voltage Mode

7

40

1.23

0.5

85

52

Price N/A

More Details

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