LM2678S12 National Semiconductor, LM2678S12 Datasheet

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LM2678S12

Manufacturer Part Number
LM2678S12
Description
TO263-7
Manufacturer
National Semiconductor
Datasheet

Specifications of LM2678S12

Date_code
03+
© 2005 National Semiconductor Corporation
LM2678
SIMPLE SWITCHER
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 characteristics.
High efficiency (
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. 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 50µA quiescent current standby
condition. The output voltage is guaranteed to a
ance. The clock frequency is controlled to within a
tolerance.
Typical Application
SIMPLE SWITCHER
®
is a registered trademark of National Semiconductor Corporation.
>
90%) is obtained through the use of a low
DS100886
®
High Efficiency 5A Step-Down
±
2% toler-
±
11%
Features
n Efficiency up to 92%
n Simple and easy to design with (using off-the-shelf
n 120 mΩ DMOS output switch
n 3.3V, 5V and 12V fixed output and adjustable (1.2V to
n 50µA standby current when switched OFF
n
n Wide input voltage range: 8V to 40V
n 260 KHz fixed frequency internal oscillator
n −40 to +125˚C operating junction temperature range
Applications
n Simple to design, high efficiency (
n Efficient system pre-regulator for linear voltage
n Battery chargers
external components)
37V ) versions
conditions
switching regulators
regulators
±
2%maximum output tolerance over full line and load
>
90%) step-down
www.national.com
10088603
April 2005

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