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參數(shù)資料
| 型號(hào)： | LM2574M-3.3 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator |
| 中文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | SMT-14 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大?。?/td> | 397K |
| 代理商： | LM2574M-3.3 |
Device
Operating
Temperature Range
Package
SEMICONDUCTOR
TECHNICAL DATA
EASY SWITCHER
0.5 A STEP–DOWN
VOLTAGE REGULATOR
ORDERING INFORMATION
LM2574DW–ADJ
TA = –40
°
to +125
°
C
SO–16L
N SUFFIX
PLASTIC PACKAGE
CASE 626
(DIP–8)
8
1
PIN CONNECTIONS
Order this document by LM2574/D
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
LM2574–3.3
LM2574–5
LM2574–12
LM2574–15
LM2574–ADJ
3.3 V
5.0 V
12 V
15 V
1.23 V to 37 V
XX = Voltage Option, i.e, 3.3, 5, 12, 15 V; and ADJ for
Adjustable Output.
* No internal connection, but should be soldered to
*
PC board for best heat transfer.
*
*
*
(Top View)
12
Pwr Gnd
ON/OFF
*
*
*
Output
*
Vin
11
10
9
5
6
7
8
LM2574N–XX
DIP–8
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO–16L)
16
1
16
*
*
FB
Sig Gnd
15
14
13
1
2
3
4
*
*
Output
*
Vin
(Top View)
8
FB
Sig Gnd
ON/OFF
Pwr Gnd
7
6
5
1
2
3
4
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
μ
A (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
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
Motorola, Inc. 1999
Rev 2, 07/1999
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| LM2574M-15 | Precision Chopper-Stabilized Operational Amplifier 8-PDIP |
| LM2574M-5.0 | SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator |
| LM2574N-3.3 | SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator |
| LM2574N-15 | SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator |
| LM2574N-12 | SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2574M-5 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHERT 0.5A Step-Down Voltage Regulator(639.73 k) |
| LM2574M-5.0 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM2574M-5.0 | 制造商:Texas Instruments 功能描述:SWITCHING REG 0.5A 5.0V SMD 2574 |
| LM2574M-5.0/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 0.5A STEP-DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM2574M-ADJ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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