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参数资料
| 型号： | LM2678LD-12 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14 |
| 封装： | LLP-14 |
| 文件页数： | 1/26页 |
| 文件大小： | 441K |
| 代理商： | LM2678LD-12 |
LM2678
SIMPLE SWITCHER High Efficiency 5A Step-Down
Voltage Regulator
General Description
The LM2678 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 characteris-
tics. 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 adjust-
able 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 LM2678 are available from several
manufacturers to greatly simplify the design process.
The LM2678 series also has built in thermal shutdown,
current limiting and an ON/OFF control input that can power
down the regulator to a low 50A quiescent current standby
condition. The output voltage is guaranteed to a ±2% toler-
ance. The clock frequency is controlled to within a ±11%
tolerance.
Features
n
Efficiency up to 92%
n
Simple and easy to design with (using off-the-shelf
external components)
n
120 m
DMOS output switch
n
3.3V, 5V and 12V fixed output and adjustable (1.2V to
37V ) versions
n
50A standby current when switched OFF
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
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
10088603
SIMPLE SWITCHER is a registered trademark of National Semiconductor Corporation.
August 2002
LM2678
SIMPLE
SWITCHER
High
Efficiency
5A
Step-Down
V
oltage
Regulator
2002 National Semiconductor Corporation
DS100886
www.national.com
相关PDF资料 |
PDF描述 |
|---|---|
| LM2678LDX-5.0 | 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14 |
| LM2678LD-3.3 | 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14 |
| LM2678LD-5.0 | 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14 |
| LM2678LDX-12 | 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14 |
| LM2734XMKX/NOPB | 2.5 A SWITCHING REGULATOR, 1900 kHz SWITCHING FREQ-MAX, PDSO6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2678LD-3.3 | 制造商:Rochester Electronics LLC 功能描述:5A STEP DOWN SIMP SWITCH 260KH - Bulk |
| LM2678LD-5.0 | 制造商:Rochester Electronics LLC 功能描述:5A STEP DOWN SIMP SWITCH 260KH - Bulk |
| LM2678S-12 | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2678S-12/NOPB | 功能描述:直流/直流开关转换器 HIGH EFF 5A STEP- DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2678S3.3 | 制造商:National Semiconductor 功能描述:Conv DC-DC Single Step Down 8V to 40V 8-Pin(7+Tab) TO-263 Rail |
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