參數(shù)資料
型號(hào)： TPS2306DWG4
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： SOIC-16
文件頁(yè)數(shù)： 27/29頁(yè)
文件大?。?/td> 427K
代理商： TPS2306DWG4
TPS2306
DUAL SEQUENCING HOT SWAP POWER MANAGER
SLVS368 APRIL 2001
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed pin description
CPUMP — Charge pump output. A capacitor with a value between 0.01
F and 0.1 F must be connected
between this pin and ground. The capacitor provides charge storage for driving the gate of the external NMOS
device.
CS2 — Channel 2 current sense input. This pin is used as the current sense for the LCA on the second supply
controller. This pin must be connected to the sense resistor on the input supply having the lower potential.
CT — Fault timer capacitor pin. A capacitor connected from this pin to ground is used to establish the amount
of time that the TPS2306 is allowed to operate in the constant-current mode.
DOWN1, DOWN2 — Ramp-down comparator inputs for Channels 1 and 2, respectively. These inputs are used
to sequence the turn-off of the two supply outputs. Each output starts its turn-off when the voltage on the
corresponding DOWNx input falls below the nominal 0.5 V threshold.
ENBL — Device enable input. Pulling this pin below 0.8 V turns off both external FETs, and puts the IC in
low-current sleep mode. Driving this pin above 2.0 V enables the TPS2306.
FAULT — Active high fault indicator output. This pin becomes a high impedance when a latched fault occurs.
The indication can be the result of a fault time-out or overcurrent condition on either supply. This output can be
used to generate a visual indication of a plug-in card’s status, or as an enable signal for a bus isolation switch.
GATE1, GATE2 — Outputs of the linear current amplifiers. These pins are used to drive the gates of the external
N-channel FETs which act as switches to either turn ON or OFF input supply current to the two loads.
GND — Common ground connection for the IC.
IMAX1, IMAX2 — Programming input to establish the maximum sourcing current level for each of the supplies.
A resistor must be connected between each input supply rail and the corresponding IMAXx input pin of the
device. An internal current sink at each of these pins develops a voltage across the programming resistor,
providing the reference level or threshold at the inverting input of each LCA.
IREF — Reference current programming pin. An external resistor must be connected between this pin and
device ground. Current sourced from this pin determines the precision current sink value at the two IMAXx pins,
thus establishing the constant-current and overcurrent thresholds for the application circuit.
UP1, UP2 — Ramp-up comparator inputs for Channels 1 and 2, respectively. These inputs are used to
sequence the turn-on of the two supply outputs. Each output begins to ramp up when the voltage on the
corresponding UPx input exceeds the nominal +1.5 V threshold.
VCC/CS1 — Supply input for the TPS2306 and channel 1 current sense input. VCC/CS1 is a dual function pin
used for input power to the chip, as well as the current sense input for the channel 1 LCA. For proper device
operation, VCC/CS1 must be connected to the sense resistor of the input supply having the highest voltage
potential.
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