LM5145 datasheet(4/70 Pages) TI

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Table 6-1. Pin Functions (continued)

I/O(1)

DESCRIPTION

NO.

NAME

PG/SYNCOUT

An open-collector output that goes low if VOUT is outside the specified regulation window. The PG/

SYNCOUT pin of the primary controller in dual-phase mode provides a 180° phase-shifted SYNCOUT

signal.

PFM/SYNC

Connect PFM/SYNC to VDDA to enable diode emulation mode. Connect PFM to AGND to operate the

LM5148 in forced PWM (FPWM) mode with continuous conduction at light loads. PFM can also be used

as a synchronization input to synchronize the internal oscillator to an external clock signal.

An active-high precision input with rising threshold of 1 V and hysteresis current of 10 µA. If the EN

voltage is less than 0.5 V, the LM5148 is in shutdown mode, unless a SYNC signal is present on PFM/

SYNC.

ISNS+

Current sense amplifier input. Connect this pin to the inductor side of the external current sense resistor

(or to the relevant sense capacitor terminal if inductor DCR current sensing is used) using a low-current

Kelvin connection.

VOUT

Output voltage sense and the current sense amplifier input. Connect VOUT to the output side of the

current sense resistor (or to the relevant sense capacitor terminal if inductor DCR current sensing is

used).

—

Connect to GND at the exposed pad to improve heat spreading.

—

Connect to GND at the exposed pad to improve heat spreading.

—

Connect to GND at the exposed pad to improve heat spreading.

(1)

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

LM5148

SNVSC01 – FEBRUARY 2023

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