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参数资料
| 型号： | LM2670LDX-ADJ |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | LLP-14 |
| 文件页数： | 1/26页 |
| 文件大小： | 441K |
| 代理商： | LM2670LDX-ADJ |
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 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.
The switching clock frequency can be provided by an inter-
nal 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 external 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,
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.
Features
n
Efficiency up to 94%
n
Simple and easy to design with (using off-the-shelf
external components)
n
150 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
External Sync clock capability (280KHz to 400KHz)
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
n
Communications and radio equipment regulator with
synchronized clock frequency
Typical Application
10094203
SIMPLE SWITCHER is a registered trademark of National Semiconductor Corporation.
August 2002
LM2670
SIMPLE
SWITCHER
High
Efficiency
3A
Step-Down
V
oltage
Regulator
with
Sync
2002 National Semiconductor Corporation
DS100942
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2670S-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 |
| LM2670S-12/NOPB | 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 |
| LM2670S12NOPB | 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 |
| LM2670S-3.3 | 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 |
| LM2670S-3.3/NOPB | 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 |
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