LM5145 datasheet(3/69 Pages) TI

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5 Description (continued)

Several features are included to simplify compliance with CISPR 11 and CISPR 32 EMI requirements. Adaptively

timed, high-current MOSFET gate drivers with adjustable slew rate control minimize body diode conduction

during switching transitions, reducing switching losses and improving thermal and EMI performance at high

input voltage and high switching frequency. To reduce input capacitor ripple current and EMI filter size, 180°

interleaved operation is provided for two outputs. A 90° out-of-phase clock output works well for cascaded,

multi-channel, or multiphase power stages. Resistor-adjustable switching frequency as high as 2.2 MHz can

be synchronized to an external clock source up to 2.5 MHz to eliminate beat frequencies in noise-sensitive

applications. Optional triangular spread spectrum modulation further improves the EMI signature.

Additional features of the LM25143 include 150°C maximum junction temperature operation, user-selectable

diode emulation for lower current consumption at light-load conditions, configurable soft-start functions, open-

drain power-good flags for fault reporting and output monitoring, independent enable inputs, monotonic start-up

into prebiased loads, an integrated VCC bias supply regulator with automatic changeover to an external bias

connected at VCCX, programmable hiccup-mode overload protection, and thermal shutdown protection with

automatic recovery. Current is sensed using the inductor DCR for highest efficiency or an optional shunt resistor

for high accuracy.

The LM25143 controller comes in a 6-mm × 6-mm thermally enhanced, 40-pin VQFN package. The wide input

voltage range, low quiescent current consumption, high-temperature operation, cycle-by-cycle current limit, low

EMI signature, and small solution size provide an ideal point-of-load regulator solution for applications requiring

enhanced reliability and durability.

6 Device Comparison Table

Device

Orderable Part Number

Package Drawing

Package Type

Wettable Flanks

Maximum VIN

LM25143

LM25143RHAR

RHA

VQFN

42 V

LM5143

LM5143RHAR

RHA

VQFN

65 V

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LM25143

SNVSC10 – MARCH 2022

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