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LM2574 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. LM2574
Description  0.5 A, Adjustable Output Voltage, Step−Down Switching Regulator
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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LM2574 Datasheet(HTML) 1 Page - ON Semiconductor

 
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© Semiconductor Components Industries, LLC, 2006
August, 2006 − Rev. 8
1
Publication Order Number:
LM2574/D
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
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
*For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
1
16
SO−16 WB
DW SUFFIX
CASE 751G
PIN CONNECTIONS
*
(Top View)
12
Pwr Gnd
ON/OFF
*
*
*
*
11
10
9
5
6
7
8
*
16
*
*
FB
Sig Gnd
Output
*
Vin
15
14
13
1
2
3
4
*
* No internal connection, but should be soldered to
* PC board for best heat transfer.
*
(Top View)
8
FB
Sig Gnd
ON/OFF
Pwr Gnd
Output
*
Vin
7
6
5
1
2
3
4
See detailed ordering and shipping information in the package
dimensions section on page 24 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page 24 of this data sheet.
DEVICE MARKING INFORMATION
PDIP−8
N SUFFIX
CASE 626
1
8
http://onsemi.com


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