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參數(shù)資料
| 型號： | LM2574 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator(0.5A,可調(diào)輸出電壓,降壓型開關(guān)穩(wěn)壓器) |
| 中文描述： | 0.5甲，可調(diào)輸出電壓，降壓型開關(guān)穩(wěn)壓器（0.5A的，可調(diào)輸出電壓，降壓型開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 1/26頁 |
| 文件大小： | 295K |
| 代理商： | LM2574 |
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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, StepDown
Switching Regulator
The LM2574 series of regulators are monolithic integrated circuits
ideally suited for easy and convenient design of a stepdown
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 switchmode power supply, its
efficiency is significantly higher in comparison with popular
threeterminal 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 A (typical) standby current. The
output switch includes cyclebycycle 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
PbFree Packages are Available*
Applications
Simple and HighEfficiency StepDown (Buck) Regulators
Efficient Preregulator for Linear Regulators
OnCard Switching Regulators
Positive to Negative Converters (BuckBoost)
Negative StepUp Converters
Power Supply for Battery Chargers
*For additional information on our PbFree strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
1
16
SO16 WB
DW SUFFIX
CASE 751G
PIN CONNECTIONS
*
*
*
(Top View)
12
Pwr Gnd
ON/OFF
*
*
*
Output
*
V
in
11
10
9
5
6
7
8
16
*
*
FB
Sig Gnd
15
14
13
1
2
3
4
*
* No internal connection, but should be soldered to
*
PC board for best heat transfer.
*
Output
*
V
in
(Top View)
8
FB
Sig Gnd
ON/OFF
Pwr Gnd
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
PDIP8
N SUFFIX
CASE 626
1
8
http://onsemi.com
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| LM2575T-12 | EASY SWITCHERE⑩ 1.0 A STEP-DOWN VOLTAGE REGULATOR |
| LM2575D2T-15 | EASY SWITCHERE⑩ 1.0 A STEP-DOWN VOLTAGE REGULATOR |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2574 3.3V WAF | 制造商:Motorola Inc 功能描述: |
| LM2574/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Easy Switcher? 0.5A Step-Down Voltage Regulator |
| LM2574_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:52kHz Simple 0.5A Buck Regulator |
| LM2574_06 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:0.5 A, Adjustable Output Voltage, Step−Down Switching Regulator |
| LM2574-12 | 制造商:Texas Instruments 功能描述: |
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