參數(shù)資料
型號(hào)： LM2677SDX-12/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14
封裝： LLP-14
文件頁(yè)數(shù)： 1/26頁(yè)
文件大?。?/td> 677K
代理商： LM2677SDX-12/NOPB
February 21, 2008
LM2677
SIMPLE SWITCHER High Efficiency 5A Step-Down
Voltage Regulator with Sync
General Description
The LM2677 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 5A
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 LM2677 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 LM2677 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 92%
■ Simple and easy to design with (using off-the-shelf
external components)
■ 100 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
10130103
SIMPLE SWITCHER is a registered trademark of National Semiconductor Corporation
2008 National Semiconductor Corporation
101301
www.national.com
LM2677
SIMPLE
SWITCHER
High
Efficiency
5A
Step-Down
Voltage
Regulator
with
Sync
相關(guān)PDF資料
PDF描述
LM2679LD-ADJ 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14
LM2679LDX-3.3 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14
LM2679LDX-12 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14
LM2679LDX-5.0 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14
LM2679SDX-5.0/NOPB 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2677SDX-3.3 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
LM2677SDX-3.3/NOPB 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
LM2677SDX-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
LM2677SDX-5.0/NOPB 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
LM2677SDX-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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