LM5145 datasheet(3/67 Pages) TI1

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LM5145

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SNVSAI4 – JUNE 2017

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5 Description (continued)

The LM5145 voltage-mode controller 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

LM5145 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 is ideal for cascaded or multi-

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

the LM5145 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 LM5145 controller is offered in a 3.5-mm × 4.5-mm thermally-enhanced VQFN-20 package with additional

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

LM5145 Datasheet(PDF) 3 Page - Texas Instruments