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LM22670MR-ADJ/NOPB LM22670MRE-ADJ/NOPB L22670 Buck Switching Regulator IC
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Features
Wide Input Voltage Range: 4.5 V to 42 VInternally Compensated
Voltage Mode ControlStable With Low ESR Ceramic Capacitors120-mQ
N-channel MOSFET PFM Package100-mQ N-channel MOSFET SO
PowerPADTM-8Package
Output Voltage Options:-ADJ (Outputs as Low as 1.285 V)5.0 (Output
Fixed to 5 V)
+1.5% Feedback Reference Accuracy500-kHz Default Switching
FrequencyAdjustable Switching Frequency andSynchronization
-40°C to 125°C Operating Junction TemperatureRangePrecision Enable
PinIntegrated Boot-Strap DiodeIntegrated Soft-Start
Fully WEBENCH· Enabled
LM22670-Q1 is an Automotive-Grade Productthat is AEC-Q100 Grade 1
Qualified (-40C to+125°C Operating Junction Temperature)
Applications
Industrial Control
Telecom and Datacom Systems
Embedded Systems
Conversions from Standard 24-V 12-V and 5-VInput Rails
Description
The LM22670 switching regulator provides all of thefunctions
necessary to implement an efficient highvoltage step-down (buck)
regulator using a minimumof external components. This easy-to-use
regulatorincorporates a 42-V N-channel MOSFET switch thatcan
provide up to 3 A of load current. Excellent lineand load
regulation along with high efficiency (> 90%)are featured.
Voltage mode control offers shortminimum ontime, allowing the
widest ratio betweeninput and output voltages. Internal loop
compensationmeans that the user is free from the tedious task
ofcalculating the loop compensation components. Fixed5-V output and
adjustable output voltage options areavailable. The default
switching frequency is set at500 kHz, thus allowing for small
external componentsand good transient response. in addition,
thefrequency can be adjusted over a range of 200 kHzto 1 MHz with a
single external resistor. The internaoscillator can be synchronized
to a system clock or tothe oscillator of another regulator. A
precision enableinput allows simplification of regulator control
andsystem power sequencing. In shutdown mode theregulator draws
only 25 uA (typical). Built in soft-start500 us, typical) saves
external components. TheM22670 device also has builtin thermal
shutdown.and current limiting to protect against
accidentaloverloads.
The LM22670 device is a member of TexasnstrumentsSIMPLE SWITCHER
family. TheSIMPLE SWITCHERR concept provides for an easy-to-use
complete design using a minimum number ofexternal components and
the TI WEBENCH designtool. TI's WEBENCH tool includes features such
asexternal component calculation, electrical simulation.thermal
simulation, and Build-it boards for easydesign-in