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參數資料
| 型號： | LM2673T-3.3 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit |
| 中文描述： | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, ZFM7 |
| 封裝： | TO-220, 7 PIN |
| 文件頁數： | 1/26頁 |
| 文件大小： | 451K |
| 代理商： | LM2673T-3.3 |
LM2673
SIMPLE SWITCHER
3A Step-Down Voltage Regulator
with Adjustable Current Limit
General Description
The LM2673 series of regulators are monolithic integrated
circuits which provide all of the active functions for a step-
down (buck) switching regulator capable of driving up to 3A
loads with excellent line and load regulation characteristics.
High efficiency (
>
90%) is obtained through the use of a low
ON-resistance DMOS power switch. The series consists of
fixed output voltages of 3.3V, 5V and 12V and an adjustable
output version.
The SIMPLE SWITCHER concept provides for a complete
design using a minimum number of external components. A
high fixed frequency oscillator (260KHz) allows the use of
physically smaller sized components. A family of standard
inductors for use with the LM2673 are available from several
manufacturers to greatly simplify the design process.
Other features include the ability to reduce the input surge
current at power-ON by adding a softstart timing capacitor to
gradually turn on the regulator. The LM2673 series also has
built in thermal shutdown and resistor programmable current
limit of the power MOSFET switch to protect the device and
load circuitry under fault conditions. The output voltage is
guaranteed to a
±
2% tolerance. The clock frequency is
controlled to within a
±
11% tolerance.
Features
n
Efficiency up to 94%
n
Simple and easy to design with (using off-the-shelf
external components)
n
Resistor programmable peak current limit over a range
of 2A to 5A.
n
150 m
DMOS output switch
n
3.3V, 5V and 12V fixed output and adjustable (1.2V to
37V ) versions
n
±
2%maximum output tolerance over full line and load
conditions
n
Wide input voltage range: 8V to 40V
n
260 KHz fixed frequency internal oscillator
n
Softstart capability
n
40 to +125C operating junction temperature range
Applications
n
Simple to design, high efficiency (
>
90%) step-down
switching regulators
n
Efficient system pre-regulator for linear voltage
regulators
n
Battery chargers
Typical Application
10091303
SIMPLE SWITCHER
is a registered trademark of National Semiconductor Corporation.
October 2003
L
2003 National Semiconductor Corporation
DS100913
www.national.com
相關PDF資料 |
PDF描述 |
|---|---|
| LM2673T-5.0 | SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit |
| LM2673T-ADJ | SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit |
| LM2674LD-12 | SIMPLE SWITCHER Power Converter High Efficiency 500 mA Step-Down Voltage Regulator |
| LM2674LD-3.3 | SIMPLE SWITCHER Power Converter High Efficiency 500 mA Step-Down Voltage Regulator |
| LM2674LD-5.0 | SIMPLE SWITCHER Power Converter High Efficiency 500 mA Step-Down Voltage Regulator |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2673T-5.0 | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2673T-5.0/NOPB | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2673T50 | 制造商:Texas Instruments 功能描述:SWITCHING REG 3A 5.0V 2673 TO-220 |
| LM2673T-ADJ | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2673T-ADJ | 制造商:Texas Instruments 功能描述:SWITCHING REG 3A ADJ 2673 TO2207 |
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