Datasheet

TPS2359
SLUS792H –FEBRUARY 2008–REVISED MAY 2013 www.ti.com
DETAILED PIN DESCRIPTION
A0, A1, A2 These three pins select one of 27 unique I
2
C addresses for address of the TPS2359. Each pin may
be tied to ground, tied to the VINT pin, or left open. See TPS2359 I
2
C Interface section for details and Table 17
for specific addresses.
AGND Ground pin for analog circuitry inside the TPS2359.
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 bit low holds the BLKx pin
low. BLKx is pulled low when PASSx is commanded low.
EN3x Active-high enable input. Pulling this pin low turns off channel 3x by pulling the gate of the internal pass
FET to GND. An internal 200-kΩ resistor pulls this pin up to VINTwhen disconnected.
GNDx Ground pin for power circuitry associated with the 12x channel. These pins should connect to a ground
plane shared with the AGND pin.
IN12x Supply pin for channel 12x internal circuitry.
IN3x Supply pin for channel 3x internal pass FET.
IRPT Open drain output that pulls low when internal circuitry sets any of the eight status bits in Register 7.
Reading Register 7 restores IRPT to its high-Z state. Register 7 contains FLT and PG bits for all 4 channels.
OUT12x Senses the output voltage of the channel 12x path.
OUT3x Output of the channel 3x internal pass FET. If DCC R6 [7] = 0, then OUT3x must be > 2.85 V before the
12-V channel is allowed to turn on.
PASSx Gate drive pin for the 12x channel PASS FET. This pin sources 30 μA to turn the FET on. An internal
clamps prevents this pin from rising more than 14.5 V above IN12x.
SCL Serial clock input for the I
2
C interface. For details of the SCL line, see TPS2359 I
2
C Interface section.
SDA Bidirectional I
2
C data line. For details of the SDA line, see TPS2359 I
2
C Interface section for details.
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. The internal amplifier attemps to keep V
SET
= V
SENM
.
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
(by default 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.
One can connect the A0–A2 pins to this supply to pull them high, but no other external circuitry should connect to
VINT.
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