LM5145 datasheet(7/74 Pages) TI2

7 / 74 page

Table 5-1. Pin Functions (continued)

TYPE(1)

DESCRIPTION

NAME

NO.

PFM/SYNC

Connect PFM/SYNC to VDDA to operate the LM5137 in PFM mode. Connect PFM/SYNC to GND to

enable forced PWM (FPWM) mode with continuous conduction at light loads. Use PFM/SYNC as a

synchronization input to synchronize the internal oscillator to an external clock.

COMP2

Output of the channel 2 transconductance error amplifier. COMP2 is high impedance in single-output

interleaved mode. Pulling COMP2 below 100mV in interleaved mode disables the HO2 and LO2 gate

driver outputs.

GND

2, 7, 19,

24, 27,

Unused pins – connect to the exposed pad on the PCB.

(1)

P = Power, G = Ground, I = Input, O = Output

5.1 Wettable Flanks

100% automated visual inspection (AVI) post-assembly is typically required to meet requirements for high

reliability and robustness. Standard quad-flat no-lead (QFN) packages do not have solderable or exposed

pins and terminals that are easily viewed. Visually determining whether or not the package is successfully

soldered onto the printed-circuit board (PCB) is therefore difficult. The wettable-flank process was developed to

resolve the issue of side-lead wetting of leadless packaging. The LM5137 is assembled using a 36-pin VQFN

package with wettable flanks to provide a visual indicator of solderability, which reduces inspection time and

manufacturing costs.

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LM5137

SNVSCU3 – OCTOBER 2025

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LM5145 Datasheet(PDF) 7 Page - Texas Instruments