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LM22670Q 数据表(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 LM22670Q
功能描述  3A SIMPLE SWITCHER짰, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Frequency
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM22670Q 数据表(HTML) 1 Page - National Semiconductor (TI)

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LM22670/LM22670Q
December 10, 2010
3A SIMPLE SWITCHER®, Step-Down Voltage Regulator
with Synchronization or Adjustable Switching Frequency
General Description
The LM22670 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 3A
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 switching frequency
can also be adjusted with an external resistor or synchronized
to an external clock up to 1MHz. It is also possible to self-
synchronize multiple regulators to share the same switching
frequency. The LM22670 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.
Features
Wide input voltage range: 4.5V to 42V
Internally compensated voltage mode control
Stable with low ESR ceramic capacitors
120 mΩ N-channel MOSFET TO-263 THIN package
100 mΩ N-channel MOSFET PSOP-8 package
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
Integrated soft-start
Fully WEBENCH® enabled
Step-down and inverting buck-boost applications
LM22670Q 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)
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
30076001
© 2010 National Semiconductor Corporation
300760
www.national.com


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