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參數資料
| 型號： | LM22672QMRE-ADJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, PSOP-8 |
| 文件頁數： | 1/18頁 |
| 文件大小： | 430K |
| 代理商： | LM22672QMRE-ADJ |
LM22672/LM22672Q
January 24, 2011
1A SIMPLE SWITCHER, Step-Down Voltage Regulator
with Features
General Description
The LM22672 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 1A
loads with excellent line and load regulation characteristics.
High efficiency (>90%) is obtained through the use of a low
ON-resistance N-channel MOSFET. The series consists of a
fixed 5V output and an adjustable version.
The SIMPLE SWITCHER concept provides for an easy to
use complete design using a minimum number of external
components and National’s WEBENCH design tool.
National’s WEBENCH tool includes features such as exter-
nal component calculation, electrical simulation, thermal sim-
ulation, and Build-It boards for easy design-in. The switching
clock frequency is provided by an internal fixed frequency os-
cillator which operates at 500 kHz. The switching frequency
can also be adjusted with an external resistor or synchronized
to an external clock up to 1MHz. It is also possible to self-
synchronize multiple regulators to share the same switching
frequency. The LM22672 series also has built in thermal shut-
down, current limiting and an enable control input that can
power down the regulator to a low 25 A quiescent current
standby condition. An adjustable soft-start feature is provided
by selecting an appropriate external soft-start capacitor.
Features
■ Wide input voltage range: 4.5V to 42V
■ Internally compensated voltage mode control
■ Stable with low ESR ceramic capacitors
■ 200 m N-channel MOSFET
■ Output voltage options:
-ADJ (outputs as low as 1.285V)
-5.0 (output fixed to 5V)
■ ±1.5% feedback reference accuracy
■ Switching frequency of 500 kHz, adjustable between 200
kHz and 1 MHz
■ -40°C to 125°C operating junction temperature range
■ Precision enable pin
■ Integrated boot diode
■ Adjustable soft-start
■ Fully WEBENCH enabled
■ Step-down and inverting buck-boost applications
■ LM22672Q is an Automotive Grade product that is AEC-
Q100 grade 1 qualified (-40°C to +125°C operating
junction temperature)
Package
■ PSOP-8 (Exposed Pad)
Applications
■ Industrial Control
■ Telecom and Datacom Systems
■ Embedded Systems
■ Automotive Telematics and Body Electronics
■ Conversions from Standard 24V, 12V and 5V Input Rails
Simplified Application Schematic
30076701
2011 National Semiconductor Corporation
300767
www.national.com
LM22672/LM22672Q
1A
SIMPLE
SWITCHER,
Step-Down
Voltage
Regulator
with
Features
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM22672QMRE-ADJ/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 |
| LM22672QMRX-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 |
| LM22672QMRX-ADJ/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 |
| LM22673 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3A SIMPLE SWITCHER, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit |
| LM22673EVAL | 制造商:Texas Instruments 功能描述:Step-Down Switching Regulator Eval. Boar |
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