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LM2678T-3.3 Datasheet

  • LM2678T-3.3

  • SIMPLE SWITCHER?? High Efficiency 5A Step-Down Voltage Regul...

  • 23頁

  • NSC

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LM2678 SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
March 2000
LM2678
SIMPLE SWITCHER
廬
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 in-
ductors 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, cur-
rent limiting and an ON/OFF control input that can power
down the regulator to a low 50碌A quiescent current standby
condition. The output voltage is guaranteed to a
鹵
2% toler-
ance. The clock frequency is controlled to within a
鹵
11% tol-
erance.
Features
n
Efficiency up to 92%
n
Simple and easy to design with (using off-the-shelf
external components)
n
120 m鈩?DMOS output switch
n
3.3V, 5V and 12V fixed output and adjustable (1.2V to
37V ) versions
n
50碌A standby current when switched OFF
n
鹵
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
鈭?0 to +125藲C 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
DS100886-3
SIMPLE SWITCHER
廬
is a registered trademark of National Semiconductor Corporation.
漏 2000 National Semiconductor Corporation
DS100886
www.national.com

LM2678T-3.3 產(chǎn)品屬性

  • National Semiconductor (TI)

  • 3.3 V

  • 5 A

  • 260 KHz

  • Through Hole

  • TO-220

  • Tube

  • 1

  • 45

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