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Numéro de référence | LM22678 | ||
Description | Step-Down Voltage Regulator | ||
Fabricant | National Semiconductor Corporation | ||
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1 Page
October 17, 2008
LM22678
5A SIMPLE SWITCHER®, Step-Down Voltage Regulator
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General Description
The LM22678 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 N-channel MOSFET. The series consists of a
fixed 5V output and an adjustable version.
The SIMPLE SWITCHER® concept provides for an easy to
use complete design using a minimum number of external
components and National’s WEBENCH® design tool.
National’s WEBENCH® tool includes features such as exter-
nal component calculation, electrical simulation, thermal sim-
ulation, and Build-It boards for easy design-in. The switching
clock frequency is provided by an internal fixed frequency os-
cillator which operates at 500 kHz. The LM22678 series also
has built in thermal shutdown, current limiting and an enable
control input that can power down the regulator to a low 25
µA quiescent current standby condition.
Features
■ Wide input voltage range: 4.5V to 42V
■ Internally compensated voltage mode control
■ Stable with low ESR ceramic capacitors
■ 100 mΩ N-channel MOSFET
■ Output voltage options:
-ADJ (outputs as low as 1.285V)
-5.0 (output fixed to 5V)
■ ±1.5% feedback reference accuracy
■ Switching frequency of 500 kHz
■ -40°C to 125°C operating junction temperature range
■ Precision enable pin
■ Integrated boot diode
■ Integrated soft-start
■ Fully WEBENCH® enabled
■ Step-down and inverting buck-boost applications
Package
■ TO-263 THIN (Exposed Pad)
Applications
■ Industrial Control
■ Telecom and Datacom Systems
■ Embedded Systems
■ Automotive Telematics and Body Electronics
■ Conversions from Standard 24V, 12V and 5V Input Rails
Simplified Application Schematic
© 2008 National Semiconductor Corporation 300761
30076101
www.national.com
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Pages | Pages 14 | ||
Télécharger | [ LM22678 ] |
No | Description détaillée | Fabricant |
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LM22670-Q1 | LM22670/-Q1 42-V 3-A SIMPLE SWITCHER Step-Down Voltage Regulator With Features (Rev. P) | Texas Instruments |
LM22671 | LM22671/-Q1 42 V 500 mA SIMPLE SWITCHER Step-Down Voltage Regulator with Features (Rev. N) | Texas Instruments |
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