Synchronous step-down converter for adjusting wide input voltage range

The Texas Instruments LMR38020 is a synchronous step-down converter designed to regulate a wide input voltage range. This reduces the need for external surge suppression components. If desired, the LMR38020 operates with a duty cycle of nearly 100% during input voltage drops as low as 4.2V, making the device ideal for a wide range of input industrial applications and MHEV/EV systems.

The converter uses precision enablement to provide flexibility by allowing direct connection to a wide input voltage or precise control of device startup and shutdown. The power-good flag has built-in filtering and latency, provides a true indication of the state of the system, and does not require an external manager.

The LMR38020 integrates pseudo-random spread spectrum from minimal EMI, and the switching frequency can be configured between 200 kHz and 2.2 MHz to avoid noise sensitive bands. You can choose a frequency that increases efficiency at low operating frequencies, or a smaller solution size at high operating frequencies. Built-in protection features include week-by-week term current, belch mode short-circuit protection and hot shutdown in case of excessive power consumption. The converter comes in an 8-pin HSOIC PowerPAD package.

Features

● Functional safety capability: Documentation is available to aid functional safety system design
● Configured for rugged industrial applications:
-   Input voltage range: 4.2V to 80v
-   Continuous output current :2a
-   Ultra-low working static current: 40μA
-   Distance between V(IN) and GND pins :> 1.5mm
-   Adjustable switching frequency :200 kHz to 2.2 MHz
-   Synchronize the frequency with the external clock
-   Spread spectrum selection reduces electromagnetic interference
-   Bandwidth ratio :97% (max).
-   Startup with prebiased output is supported
-   Tolerance voltage reference: room temperature ±1.0%
-   Precision
-   Easy to use, low BOM number
-   Integrated synchronous rectification
-   Internal compensation is easy to use
-   Package: 8-pin HSOIC with PowerPAD
-   PFM and forced PWM (FPWM) options

Applications

● Industrial transportation
● Wireless infrastructure and networking
● Power output
● Factory automation and control