LM5177DCPR datasheet(5/60 Pages) TI2

5 / 60 page

Table 4-1. Pin Functions LM5177 (continued)

Type(1)

Description

Name

No.

SS/ATRK

I/O

Soft-start programming pin. A capacitor between the SS pin and AGND pin programs soft-start

time. Analog output voltage tracking pin. The VOUT regulation target can be programmed

by connecting the pin to variable voltage reference (for example, through a digital to analog

converter). The internal circuit selects the lowest voltage applied to the pin.

SW1

Inductor switch node for the buck half-bridge

SW2

Inductor switch node for the boost half-bridge

SYNC

Synchronization clock input. The internal oscillator can be synchronized to an external clock

during operation. If the output or input current sense amplifier is configured as a current limiter

pulling, this pin is low during start-up, device switches the current limit direction to a negative

polarity. Do not leave this pin floating. If this function is not used, connect the pin to VCC.

VCC

Internal linear bias regulator output. Connect a ceramic decoupling capacitor from VCC to PGND.

VIN

The input supply and sense input of the device. Connect VIN to the supply voltage of the power

stage.

VOUT

VOUT sense input. Connect to the power stage output rail.

(1)

I = Input, O = Output, I/O = Input or Output, G = Ground, P = Power, NC = No Connect

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LM5177

SNVSBU4F – JUNE 2022 – REVISED JANUARY 2025

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LM5177DCPR Datasheet(PDF) 5 Page - Texas Instruments