DEVICE INFORMATION

DETAILED PIN DESCRIPTION

TPS2358

AGND Ground pin for the analog circuitry inside the TPS2358.

BLKx Gate drive pin for the 12x channel BLK FET. This pin sources 30

µA to turn the FET on. An internal clamp

prevents this pin from rising more than 14.5 V above OUT12x. Setting the ORENx pin high holds the BLKx pin

low.

CTx A capacitor from CTx to GND sets the time the channel can remain in current limit before it shuts down and

declares a fault. Current limit causes this pin to source 10

µA into the external capacitor (CT). When VCTx

reaches 1.35 V, the TPS2358 shuts the channel off by pulling the PASSx pin low and declares an over-current

fault by pulling the FLTx pin low.

EN12x Active low enable input. Pulling this pin high (or allowing it to float high) turns off channel 12x by pulling

both BLKx and PASSx low. An internal 200-k

Ω resistor pulls this pin up to VINT when disconnected.

EN3x Active low enable input. Pulling this pin high (or allowing it to float high) turns off channel 3x by pulling the

gate of the internal pass FET to GND. An internal 200-k

Ω resistor pulls this pin up to VINT when disconnected.

FLTx Active low open-drain output indicating that channel x has remained in current limit long enough to time out

the fault timer and shut the channel down.

IN12x Supply pin for channel 12x internal circuitry.

IN3x Supply pin for channel 3x internal pass FET.

ORENx Active low input. Pulling this pin low allows the 12x channel ORing function to operate normally. Pulling

this pin high (or allowing it to float high) disables the ORing function by pulling the BLKx pin low. An internal

200-k

Ω resistor pulls this pin up to VINT when disconnected.

OUT12x Senses the output voltage of the channel 12x path.

OUT3x Output of the channel 3x internal pass FET.

PASSx Gate drive pin for the 12x channel pass FET. This pin sources 30

µA to turn the FET on. An internal

clamp prevents this pin from rising more than 14.5 V above IN12x.

PGx Active low open-drain output indicating that channel x output voltage has dropped below the PG threshold,

which nominally equals 2.85 V for the 3x channels and 10.5 V for the 12x channels.

SENMx Senses the voltage on the low side of the channel 12x current sense resistor.

SENPx Senses the voltage on the high side of the channel 12x current sense resistor.

SETx A resistor connected from this pin to SENPx sets the current limit level in conjunction with the current

sense resistor and the resistor connected to the SUM12x pin, as described in 12-V thresholds – setting current

limit and fast over current trip section.

SUMx A resistor connected from this pin to ground forms part of the channel x current limit. As the current

delivered to the load increases, so does the voltage on this pin. When the voltage on this pin reaches a threshold

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

VDD3x Supply pin for channel3x internal circuitry.

VINT This pin connects to the internal 2.35-V rail. A 0.1-

µF capacitor must be connected from this pin to ground.

Do not connect other external circuitry to this pin.

Copyright © 2008, Texas Instruments Incorporated

Submit Documentation Feedback

9

Product Folder Link(s): TPS2358