TPS65276RHHT datasheet(8/33 Pages) TI

8 / 33 page

TPS65276

SLVSC83A – AUGUST 2013 – REVISED DECEMBER 2013

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TERMINAL FUNCTIONS

NO.

NAME

DESCRIPTION

(HTSSOP)

(QFN)

EN1, EN2

1, 2

32, 33

Enable pin. Adjust the input under-voltage lockout with two resistors.

PGND2

3, 4

34, 35, 36

Power ground of buck2, place the input capacitor’s ground pin as close

as possible to this pin.

PVIN2

5, 6

1, 2

Power input. Input power supply to the power switches of the power

converter 2.

ISHARE

Logic pin to configure current sharing mode, tie to high to parallel two

buck converters, in current sharing mode, buck1 will be used; tie to low to

run in separate mode.

MODE

Connecting this pin to ground, the buck converter forces a continuous

current mode (CCM) operation. Connecting this pin to V7V, the buck

converter automatically operates in pulse skipping mode (PSM) at light

load condition to save the power.

V7V

Internal low-drop linear regulator (LDO) output to power internal driver

and control circuits. Decouple this pin to power ground with a minimum

1-µF ceramic capacitor. Output regulates to typical 6.3 V for optimal

conduction on-resistances of internal power MOSFETs. In PCB design,

the power ground and analog ground should have one-point common

connection at the (-) terminal of V7V bypass capacitor. If VIN is lower

than 6.3 V, V7V will be slightly lower than VIN.

VIN

Power supply of the internal LDO and controllers

PVIN1

11, 12

7, 8

Power input. Input power supply to the power switches of the power

converter 1.

PGND1

13, 14

9, 10, 11

Power ground of buck1, place the input capacitor’s ground pin as close

as possible to this pin.

PGOOD1

Power Good pin for buck1, open drain output, when output is within

range, output high impedance, a 100-k

Ω resistor is recommended to

connect to this pin.

PGOOD2

Power Good pin for buck2, open drain output, when output is within

range, output high impedance, a 100-k

Ω resistor is recommended to

connect to this pin. In current sharing mode, float this pin.

FB1

Feedback sensing pin for buck1 output voltage. Connect this pin to the

resistor divider of buck1 output. The feedback reference voltage is 0.6 V

±1%.

RLIM1

Current limit threshold set pin for buck1, connect a resistor between this

pin to GND to set the OCP.

BST1

Add a bootstrap capacitor between BST1 and LX1. The voltage on this

capacitor carries the gate drive voltage for the high-side MOSFET.

LX1

20, 21

17, 18, 19

Switching node of buck1

SS1

22, 27

20, 25

Soft-start and voltage tracking in buck1. An external capacitor connected

to this pin sets the internal voltage reference rise time. Since the voltage

on this pin overrides the internal reference, it can be used for tracking and

sequencing. In current sharing application, this pin serves as the soft-start

pin.

COMP1

Error amplifier output and loop compensation pin for buck1. Connect

frequency compensation to this pin; In current sharing application, this pin

serves as the compensation pin.

ROSC

Oscillator frequency programmable pin. Connect an external resistor to

set the switching frequency. When connected to an external clock, the

internal oscillator synchronizes to the external clock.

AGND

Analog ground of the controllers

COMP2

Error amplifier output and loop compensation pin for buck2. Connect

frequency compensation to this pin. In current sharing application, float

this pin.

SS2

Soft-start and voltage tracking in buck2. An external capacitor connected

to this pin sets the internal voltage reference rise time. Since the voltage

on this pin overrides the internal reference, it can be used for tracking and

power sequencing. In current sharing application, float this pin.

LX2

28, 29

26, 27, 28

Switching nodes

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