peculiarity
Wide input voltage range: 4.5V to 42V
Internally compensated voltage mode control
Stable and low ESR ceramic capacitors
100mΩ N-channel MOSFETs
Output Voltage Options:
- ADJ (e.g. 1.285V low output)
-5.0 (fixed 5V output)
Feedback reference accuracy± 1.5%
The switching frequency is 500 kHz
-40°C to 125°C operating junction temperature range
Precision enable pins
Integrated starter diode
Integrated soft start
Full WEBENCH ® enabled
Buck and reversed-phase buck-boost applications
LM22678Q is automotive-grade and AEC-Q100 qualified (-40°C to +125°C operating junction temperature)
illustrate
The LM22678 series regulators are monolithic integrated circuits that provide step-down switching regulators capable of driving excellent line and load regulation characteristics for 5A load (buck) all the positive functions. The high efficiency (> 90%) is achieved by using a low-resistance N-channel MOSFET. The series consists of a fixed 5V output and an adjustable version.
The SIMPLE SWITCHER ® concept provides an easy-to-use complete design with minimal number of external components and National Semiconductor's WEBENCH ® design tools. National Semiconductor's WEBENCH ® tools include features such as external component calculations, electrical simulation, thermal simulation, and simple design, build, and other boards. The switching clock frequency is made by an internal fixed-frequency oscillator, which is 500 kHz. LM22678 series also features built-in thermal shutdown, current limiting, and enable control inputs that can adjust quiescent current standby up and down with a power as low as 25μA.
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Industrial control
Telecommunications and data communication systems
Embedded systems
Automotive telematics and body electronics
Conversion of standard 24V, 12V, and 5V input voltage rails