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參數資料
| 型號： | LM2670SDX-12/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14 |
| 封裝： | LLP-14 |
| 文件頁數： | 1/26頁 |
| 文件大小： | 669K |
| 代理商： | LM2670SDX-12/NOPB |
February 29, 2008
LM2670
SIMPLE SWITCHER High Efficiency 3A Step-Down
Voltage Regulator with Sync
General Description
The LM2670 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. The
switching clock frequency can be provided by an internal fixed
frequency oscillator (260KHz) or from an externally provided
clock in the range of 280KHz to 400Khz which allows the use
of physically smaller sized components. A family of standard
inductors for use with the LM2670 are available from several
manufacturers to greatly simplify the design process. The ex-
ternal Sync clock provides direct and precise control of the
output ripple frequency for consistent filtering or frequency
spectrum positioning.
The LM2670 series also has built in thermal shutdown, cur-
rent limiting and an ON/OFF control input that can power
down the regulator to a low 50
μA quiescent current standby
condition. The output voltage is guaranteed to a ±2% toler-
ance.
Features
■ Efficiency up to 94%
■ Simple and easy to design with (using off-the-shelf
external components)
■ 150 mΩ DMOS output switch
■ 3.3V, 5V and 12V fixed output and adjustable (1.2V to
37V ) versions
■ 50μA standby current when switched OFF
■ ±2%maximum output tolerance over full line and load
conditions
■ Wide input voltage range: 8V to 40V
■ External Sync clock capability (280KHz to 400KHz)
■ 260 KHz fixed frequency internal oscillator
■ 40 to +125°C operating junction temperature range
Applications
■ Simple to design, high efficiency (>90%) step-down
switching regulators
■ Efficient system pre-regulator for linear voltage regulators
■ Battery chargers
■ Communications and radio equipment regulator with
synchronized clock frequency
Typical Application
10094203
SIMPLE SWITCHER is a registered trademark of National Semiconductor Corporation
2008 National Semiconductor Corporation
100942
www.national.com
LM2670
SIMPLE
SWITCHER
High
Efficiency
3A
Step-Down
Voltage
Regulator
with
Sync
相關PDF資料 |
PDF描述 |
|---|---|
| LM2673SDX-12/NOPB | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14 |
| LM2678S-3.3X/NOPB | 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PSSO7 |
| LM2678SDX-12/NOPB | 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14 |
| LM2681MDA | SWITCHED CAPACITOR CONVERTER, 160 kHz SWITCHING FREQ-MAX, UUC |
| LM27262MTDX/NOPB | SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO48 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2670SDX-3.3 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync |
| LM2670SDX-3.3/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 |
| LM2670SDX-5.0 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync |
| LM2670SDX-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 |
| LM2670SDX-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 |
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