Automotive, 42V VIN, 2.2MHz single-phase boost controller with VOUT tracking

The LM5126A-Q1 is a synchronous boost

controller. The device provides a regulated output voltage for

lower or equal input voltage also supporting VI to VOUT bypass

mode to save power. The device can be stacked in combination with LM5125A-Q1 for 3-phase operation.

Dynamically program VOUT

using the analog or digital ATRK/DTRK function. VI is supported down to 2.5V after

startup as the internal VCC supply is automatically switched from VBIAS

to VOUT for VBIAS < 4.5V. The fixed switching frequency is

set between 100kHz and 2.2MHz through a resistor on the RT-pin or the SYNCIN clock.

The switching modes FPWM or diode emulation can be changed during operation.

The implemented protections peak

current limit, average input current limit, average inductor current monitor,

overvoltage and undervoltage protection, and the thermal shutdown protect the device

and the application.