TPS2459 datasheet(9/44 Pages) TI

Part #	TPS2459

Description	12-V/3.3-V Hot Swap and ORing Controller with I2C??and Load Current Monitor for AdvancedMC?

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Manufacturer	TI [Texas Instruments]

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TPS2459

www.ti.com ............................................................................................................................................................................................ SLUS917 – FEBRUARY 2009

TERMINAL FUNCTIONS (continued)

NAME

I/O

DESCRIPTION

NO.

12-V blocking transistor enable. (active high). Pulling this pin high (or allowing it to float high) allows the 12-V

OREN

10

I

channel ORing function to operate normally. Pulling this pin low disables the 12-V ORing function by pulling

the BLK pin low. An internal 200-k

Ω resistor pulls this pin up to VINT when disconnected.

OUT12

8

I/O

12-V output. Senses the output voltage of the 12-V channel.

OUT3

17

I/O

3-V output. Output of the 3-V channel internal pass FET.

12-V pass transistor gate drive. This pin sources 30

µA to turn the FET on. An internal clamp prevents this pin

PASS

12

O

from rising more than 14.5 V above IN12.

12-V power good output,asserts when VOUT12 > VPG12 ( active low) . Open-drain output indicating that channel

PG12

4

O

12 output voltage has dropped below the PG threshold, which nominally equals 10.5 V.

3-V power good output, asserts when VOUT3 > 2.8 V ( active low) . Open-drain output indicating that channel 3

PG3

20

O

output voltage has dropped below the PG threshold, which nominally equals 2.85 V.

SCL

3

I

Serial clock input for the I2C™ data line. (See TPS2459 I2C™ Interface section for details.

SDA

2

I/O

Bidirectional I2C™ data line. (See TPS2459 I2C™ Interface section for details.

SENM

12

I

12-V current limit sense. Senses the voltage on the low side of the 12-V channel current sense resistor.

SENP

14

I

12-V input sense. Senses the voltage on the high side of the 12-V channel current sense resistor.

12-V current limit set. A resistor connected from this pin to SENP sets the current limit level in conjunction with

SET

13

I

the current sense resistor and the resistor connected to the SUM12 pin, as described in 12-V thresholds,

setting current limit and fast overcurrent trip section.

12-V summing node. A resistor connected from this pin to ground forms part of the channel x current limit. As

SUM12

5

I/O

the current delivered to the load increases, so does the voltage on this pin. When the voltage on this pin

reaches 675 mV, the current limit amplifier acts to prevent the current from further increasing.

3-V summing node. A resistor connected from this pin to ground forms part of the channel x current limit. As

SUM3

21

I/O

the current delivered to the load increases, so does the voltage on this pin. When the voltage on this pin

reaches 675 mV, the current limit amplifier acts to prevent the current from further increasing.

VDD3

22

I

3-V charge pump input

Bypass capacitor connection point for internal supply. This pin connects to the internal 2.35-V rail. A 0.1-

µF

VINT

1

I/O

capacitor must be connected from this pin to ground. Do not connect other external circuitry to this pin

except the address programming pins, as required.

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