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PDF LM22674 Data sheet ( Hoja de datos )
| Número de pieza | LM22674 | |
| Descripción | Step-Down Voltage Regulator | |
| Fabricantes | National Semiconductor Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM22674 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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October 17, 2008
LM22674
500 mA SIMPLE SWITCHER®, Step-Down Voltage
Regulatorwww.datasheet4u.com with Precision Enable
General Description
The LM22674 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 500
mA loads with excellent line and load regulation characteris-
tics. 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 LM22674 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
■ 200 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
■ PSOP-8 (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 300769
30076901
www.national.com
1 page  
Feedback Bias Current vs Temperature
Normalized Enable Threshold Voltage vs Temperature
www.datasheet4u.com
30076905
Standby Quiescent Current vs Input Voltage
30076910
Normalized Feedback Voltage vs Temperature
30076906
Normalized Feedback Voltage vs Input Voltage
30076907
30076909
5
www.national.com
5 Page 
PCB Layout Example
www.datasheet4u.com
Schematic for Buck/Boost
(Inverting) Application
See AN-1888 for more information on the inverting (buck-
boost) application generating a negative output voltage from
a positive input voltage.
30076941
30076926
11 www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM22674.PDF ] | |
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