TPS40400RHLR datasheet(9/56 Pages) TI1

номер детали	TPS40400RHLR

подробное описание детали	3.0-V TO 20-V PMBus SYNCHRONOUS BUCK CONTROLLER

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TPS40400

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SLUS930A

– APRIL 2011 – REVISED JULY 2011

PIN FUNCTIONS (continued)

I/O

DESCRIPTION

NAME

NO.

Signal ground for the controller. Connect the ground of signal level circuits to this pin. Connections should be

SGND

PAD

-

arranged so that power level currents do not flow in the pad attached to the thermal plane or in the SGND

portion of the circuit.

SMBALRT

23

O

Output used to signal that PMBus host that the controller needs attention.

This is the common connection for the flying high-side FET driver and also serve as a sense line for the adaptive

SW

17

I

anti-cross-conduction circuitry

Logic level input to the oscillator inside the controller. The oscillator resets on the rising edge of a pulse train

SYNC

4

I

applied to this pin and begin a new switching cycle.

Analog input to the non inverting side of the control loop error amplifier. The error amplifier has three inputs

(voltage reference, TRACK and soft-start ramp) to it

’s “+” side, and the lowest voltage applied to these three

TRACK

5

I

inputs dominate and control the output voltage of the whole converter. This pin is to allow the user to configure a

voltage divider that allows the controller output follow an external reference voltage during startup.

VDD

20

I

Input power connection for the device. 3.0 V to 20 V required.

VSNS+

9

I

Non-inverting input to the unity gain remote voltage sense amplifier.

VSNS

–

10

I

Inverting input to the unity gain remote voltage sense amplifier.

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