The LM22678 switching regulator provides all of the functions necessary to implement an efficient high-voltage step-down (buck) regulator using a minimum of external components. This easy-to-use regulator incorporates a 42-V N-channel MOSFET switch that can provide up to 5 A of load current. Excellent line and load regulation along with high efficiency (> 90%) are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5-V output and adjustable output voltage options are available. A switching frequency of 500 kHz allows for small external components and good transient response. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typical). Built-in soft-start (500 µs, typical) saves external components. The LM22678 device also has built-in thermal shutdown, and current limiting to protect against accidental overloads.
●The LM22678 device is a member of Texas Instruments SIMPLE SWITCHER® family. The SIMPLE SWITCHER concept provides for an easy-to-use complete design using a minimum number of external components and the TI WEBENCH design tool. TI"s WEBENCH tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.
● Wide Input Voltage Range: 4.5 V to 42 V
● Internally Compensated Voltage Mode Control
● Stable With Low ESR Ceramic Capacitors
● 100-mΩ N-Channel MOSFET
● Output Voltage Options:
●-ADJ (Outputs as Low as 1.285 V)
●-5.0 (Output Fixed to 5 V)
● ±1.5% Feedback Reference Accuracy
● Switching Frequency of 500 kHz
● –40°C to 125°C Operating Junction Temperature
●Range
● Precision Enable Pin
● Integrated Boot-Strap Diode
● Integrated Soft-Start
● Fully WEBENCH® Enabled
● LM22678-Q1 is an Automotive-Grade Product
●that is AEC-Q100 Grade 1 Qualified (–40°C to
●+125°C Operating Junction Temperature)
● PFM (Exposed Pad) Package
