LM5145 datasheet(5/69 Pages) TI

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Table 7-1. Pin Functions

I/O(1)

DESCRIPTION

NAME

NO.

SS2

Channel 2 soft-start programming pin. An external ceramic capacitor and an internal 20-μA current source

set the ramp rate of the internal error amplifier reference during soft start. Pulling SS2 below 150 mV turns

off the channel 2 gate driver outputs, but all the other functions remain active.

COMP2

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

interleaved or single-output multiphase operation.

FB2

Feedback input of channel 2. Connect FB2 to VDDA for a 3.3-V output or connect FB2 to AGND for a fixed

5-V output. A resistive divider from VOUT2 to FB2 sets the output voltage level between 0.6 V and 55 V.

The regulation threshold at FB2 is 0.6 V.

CS2

Channel 2 current sense amplifier input. Connect CS2 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.

VOUT2

Output voltage sense and the current sense amplifier input of channel 2. Connect VOUT2 to the output side

of the channel 2 current sense resistor (or to the relevant sense capacitor terminal if inductor DCR current

sensing is used).

VCCX

Optional input for an external bias supply. If VVCCX > 4.3 V, VCCX is internally connected to VCC and the

internal VCC regulator is disabled. Connect a ceramic capacitor between VCCX and PGND.

PG2

An open-collector output that goes low if VOUT2 is outside a specified regulation window

HOL2

Channel 2 high-side gate driver turn-off output

HO2

Channel 2 high-side gate driver turn-on output

SW2

Switching node of the channel 2 buck regulator. Connect to the bootstrap capacitor, the source terminal of

the high-side MOSFET, and the drain terminal of the low-side MOSFET.

HB2

Channel 2 high-side driver supply for the bootstrap gate drive

LOL2

Channel 2 low-side gate driver turn-off output

LO2

Channel 2 low-side gate driver turn-on output

PGND2

Power-ground connection pin for the low-side NMOS gate driver

VCC

15, 16

VCC bias supply pin. Pins 15 and 16 must to be connected together on the PCB. Connect ceramic

capacitors between VCC and PGND1 and between VCC and PGND2.

PGND1

Power-ground connection pin for the low-side NMOS gate driver

LO1

Channel 1 low-side gate driver turn-on output

LOL1

Channel 1 low-side gate driver turn-off output

HB1

Channel 1 high-side driver supply for the bootstrap gate drive

SW1

Switching node of the channel 1 buck regulator. Connect to the channel 1 bootstrap capacitor, the source

terminal of the high-side MOSFET, and the drain terminal of the low-side MOSFET.

HO1

Channel 1 high-side gate driver turn-on output

HOL1

Channel 1 high-side gate driver turn-off output

PG1

An open-collector output that goes low if VOUT1 is outside a specified regulation window

VIN

Supply voltage input source for the VCC regulators

VOUT1

Output voltage sense and the current sense amplifier input of channel 1. Connect VOUT1 to the output side

of the channel 1 current sense resistor (or to the relevant sense capacitor terminal if inductor DCR current

sensing is used).

CS1

Channel 1 current sense amplifier input. Connect CS1 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.

FB1

Feedback input of channel 1. Connect the FB1 pin to VDDA for a 3.3-V output or connect FB1 to AGND for

a 5-V output. A resistive divider from VOUT1 to FB1 sets the output voltage level between 0.6 V and 55 V.

The regulation threshold at FB1 is 0.6 V.

COMP1

Output of the channel 1 transconductance error amplifier (EA)

SS1

Channel 1 soft-start programming pin. An external capacitor and an internal 20-μA current source set the

ramp rate of the internal error amplifier reference during soft start. Pulling the SS1 voltage below 150 mV

turns off the channel 1 gate driver outputs, but all the other functions remain active.

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