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參數(shù)資料
| 型號(hào)： | LM2574 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 52kHz Simple 0.5A Buck Regulator(固定頻率為52kHz 輸出電流0.5A 可調(diào)轉(zhuǎn)換電壓步降穩(wěn)壓器) |
| 中文描述： | 52kHz簡(jiǎn)單0.5A的降壓穩(wěn)壓器（固定頻率為52kHz輸出電流0.5A的可調(diào)轉(zhuǎn)換電壓步降穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 1/5頁(yè) |
| 文件大?。?/td> | 67K |
| 代理商： | LM2574 |
August 1999
1
LM2574
LM2574
Micrel
Ordering Information
Part Number
LM2574BN
LM2574BWM
LM2574-3.3BN
LM2574-3.3BWM
LM2574-5.0BN
LM2574-5.0BWM
LM2574-12BN
LM2574-12BWM
Temp. Range
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
Package
8-pin Plastic DIP
14-pin Wide SOIC
8-pin Plastic DIP
14-pin Wide SOIC
8-pin Plastic DIP
14-pin Wide SOIC
8-pin Plastic DIP
14-pin Wide SOIC
LM2574
52kHz Simple 0.5A Buck Regulator
Features
3.3V, 5V, 12V, and Adjustable Output Versions
Adjustable Version Output 1.23V to 37V
±
4% Max. over
Line and Load Conditions.
Guaranteed 0.5A Output Current
Wide Input Voltage, up to 40V
Thermal Shutdown and Current Limit Protection
Requires only 4 external Components.
Shutdown Capability (Standby Mode)
Low Power Standby Mode < 200
μ
A Typical
High Efficiency
52kHz Fixed Frequency Internal Oscillator
Uses Standard Inductors
Applications
Simple High-efficiency Step-down (Buck) Regulator
Efficient Pre-Regulator for Linear Regulators
On-card Switching Regulators
Positive to Negative Converter (Buck-Boost)
General Description
The LM2574 family is a series of easy to use fixed and
adjustable switching voltage regulators. The LM2574 con-
tains all of the active circuitry necessary to construct a
stepdown (buck) switching regulator and requires a minimum
of external components.
The LM2574 is available in 3.3V, 5V, and 12V fixed output
versions, or an adjustable version with an output voltage
range of 1.23V to 37V. Output voltage is guaranteed to
±
4%
for specified input and load conditions.
The LM2574 can supply 0.5A while maintaining excellent line
and load regulation. The output switch includes cycle-by-
cycle current limiting, as well as thermal shutdown for full
protection under fault conditions.
An external shutdown connection selects operating or standby
modes. Standby current is less than 200
μ
A.
Heat sinks are generally unnecessary due the regulator’s
high efficiency. Adequate heat transfer is usually provided by
soldering all package pins to a printed circuit board.
The LM2574 includes internal frequency compensation and
an internal 52kHz fixed frequency oscillator guaranteed to
±
10% of the frequency.
Circuits constructed around the LM2574 use a standard
series of inductors which are available from several different
manufacturers.
Pin Configuration
8-pin DIP (N)
FB
1
SIG GND
2
ON/OFF
3
PWR GND
4
8
*
7
OUTPUT
6
*
5
V
IN
14-pin SOIC (WM)
*
*
1
2
3
4
5
6
7
FB
SIG GND
ON/OFF
PWR GND
*
14
13
12
11
10
9
8
*
*
OUTPUT
*
V
IN
*
*
* NC: solder to printed circuit for
maximum heat transfer
Figure 1. Fixed Output Regulator Circuit
V
IN
PWR
GND
SIG
GND
ON/
OFF
OUT
FB
LM2574
C
22μF
40V MAX
UNREGULATED
DC IN
REGULATED
OUTPUT
0.5A
11DQ05
C
220μF
330μH
Typical Application
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2575 | 52kHz Simple 1A Buck Regulator(固定頻率為52kHz 輸出電流 1A 可調(diào)轉(zhuǎn)換電壓步降穩(wěn)壓器) |
| LM2576-12BT⒂ | 52kHz Simple 3A Buck Voltage Regulator |
| LM2576-3.3BU | 52kHz Simple 3A Buck Voltage Regulator |
| LM2576-5.0BT⒂ | 52kHz Simple 3A Buck Voltage Regulator |
| LM2576-5.0BU | 52kHz Simple 3A Buck Voltage Regulator |
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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