LM5145 datasheet(3/55 Pages) TI

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5 Description (continued)

The LM5146 voltage-mode controller with line feedforward drives external high-side and low-side N-channel

power switches with robust 7.5-V gate drivers suitable for standard-threshold MOSFETs. Adaptively-timed gate

drivers with 2.3-A source and 3.5-A sink capability minimize body diode conduction during switching transitions,

reducing switching losses and improving thermal performance when driving MOSFETs at high input voltage and

high frequency. The LM5146 can be powered from the output of the switching regulator or another available

source, further improving efficiency.

A 180° out-of-phase clock output relative to the internal oscillator at SYNCOUT works well for cascaded or

multi-channel power supplies to reduce input capacitor ripple current and EMI filter size. Additional features of

the LM5146 include a configurable soft start, an open-drain power-good monitor for fault reporting and output

monitoring, monotonic start-up into prebiased loads, integrated VCC bias supply regulator and bootstrap diode,

external power supply tracking, precision enable input with hysteresis for adjustable line undervoltage lockout

(UVLO), hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

The LM5146 controller is offered in a 4.5-mm × 3.5-mm thermally enhanced, 20-pin VQFN package with

additional spacing for high-voltage pins and wettable flanks for optical inspection of solder joint fillets.

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LM5146

SNVSBV0A – JUNE 2021 – REVISED JUNE 2021

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