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PDF LM22679 Data sheet ( Hoja de datos )
| Número de pieza | LM22679 | |
| Descripción | Step-Down Voltage Regulator | |
| Fabricantes | National Semiconductor Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM22679 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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October 17, 2008
LM22679
5A SIMPLE SWITCHER®, Step-Down Voltage Regulator
www.dawtasihteeht4u.Acomdjustable Soft-Start and Current Limit
General Description
The LM22679 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 LM22679 series also
has built in thermal shutdown and current limiting. The current
limit threshold can be adjusted using an external resistor. An
adjustable soft-start feature is provided by selecting an ap-
propriate external soft-start capacitor.
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 500kHz
■ -40°C to 125°C operating junction temperature range
■ Adjustable soft-start
■ Adjustable current limit
■ Integrated boot diode
■ 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 300723
30072301
www.national.com
1 page  
Normalized Feedback Voltage vs Input Voltage
Soft-start Current vs Temperature
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30072309
Current Limit vs IADJ Resistor
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5 Page 
PCB Layout Example
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11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM22679.PDF ] | |
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