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PDF LM22675 Data sheet ( Hoja de datos )
| Número de pieza | LM22675 | |
| Descripción | Step-Down Voltage Regulator | |
| Fabricantes | National Semiconductor Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM22675 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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October 17, 2008
LM22675
1A SIMPLE SWITCHER®, Step-Down Voltage Regulator
www.dawtasihteeht4u.Pcomrecision Enable
General Description
The LM22675 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 1A
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 LM22675 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 300770
30077001
www.national.com
1 page  
Feedback Bias Current vs Temperature
Normalized Enable Threshold Voltage vs Temperature
www.datasheet4u.com
30077005
Standby Quiescent Current vs Input Voltage
30077010
Normalized Feedback Voltage vs Temperature
30077006
Normalized Feedback Voltage vs Input Voltage
30077007
30077009
5
www.national.com
5 Page 
PCB Layout Example
www.datasheet4u.com
30077041
11 www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM22675.PDF ] | |
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