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LM22671MR-5.0 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI)

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LM22671MR-5.0 bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI)

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LM22671/LM22671Q
December 10, 2010
500 mA SIMPLE SWITCHER®, Step-Down Voltage
Regulator with Features
General Description
The LM22671 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 switching frequency
can also be adjusted with an external resistor or synchronized
to an external clock up to 1 MHz. It is also possible to self-
synchronize multiple regulators to share the same switching
frequency. The LM22671 series also has built in thermal shut-
down, current limiting and an enable control input that can
power down the regulator to a low 25 µA quiescent current
standby condition. An adjustable soft-start feature is provided
by selecting an appropriate external soft-start capacitor.
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, adjustable between 200
kHz and 1 MHz
-40°C to 125°C operating junction temperature range
Precision enable pin
Integrated boot diode
Adjustable soft-start
Fully WEBENCH® enabled
Step-down and inverting buck-boost applications
LM22671Q is an Automotive Grade product that is AEC-
Q100 grade 1 qualified (-40°C to +125°C operating
junction temperature)
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
30076801
© 2010 National Semiconductor Corporation
300768
www.national.com


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Mô tả tương tự - LM22671MR-5.0

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