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TPS2103DBVR Datasheet(PDF) 4 Page - Texas Instruments |
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TPS2103DBVR Datasheet(HTML) 4 Page - Texas Instruments |
4 / 20 page TPS2102, TPS2103 VAUX POWER-DISTRIBUTION SWITCHES SLVS234A – SEPTEMBER 1999 – REVISED APRIL 2000 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL NO. DESCRIPTION NAME TPS2102 TPS2103 I/O DESCRIPTION DBV D DBV D EN 1 3 I Active-high enable for IN1-OUT switch EN 1 3 I Active-low enable for IN1-OUT switch GND 2 2 2 2 I Ground IN1† 5 5 5 5 I Main Input voltage, NMOS drain (250 m Ω), require 0.22 µF bypass IN2† 3 1 3 1 I Auxilliary input voltage, PMOS drain (1.3 Ω ), require 0.22 µF bypass OUT 4 7, 8 4 7, 8 O Power switch output NC 4, 6 4, 6 No connection † Unused INx should not be grounded. detailed description power switches n-channel MOSFET The IN1-OUT n-channel MOSFET power switch has a typical on-resistance of 250 m Ω at 3.3-V input voltage, and is configured as a high-side switch. p-channel MOSFET The IN2-OUT p-channel MOSFET power switch has a typical on-resistance of 1.3 Ω at 3.3-V input voltage and is configured as a high-side switch. When operating, the p-channel MOSFET quiescent current is reduced to typically 0.75 µA. charge pump An internal charge pump supplies power to the driver circuit and provides the necessary voltage to pull the gate of the MOSFET above the source. The charge pump operates from input voltages as low as 2.7 V and requires very little supply current. driver The driver controls the gate voltage of the IN1-OUT and IN2-OUT power switches. To limit large current surges and reduce the associated electromagnetic interference (EMI) produced, the drivers incorporate circuitry that controls the rise times and fall times of the output voltage. enable The logic enable will turn on the IN2-OUT power switch when a logic high is present on EN (TPS2102) or logic low is present on EN (TPS2103). A logic low input on EN (TPS2102) or logic high on EN (TPS2103) restores bias to the drive and control circuits and turns on the IN1-OUT power switch. The enable input is compatible with both TTL and CMOS logic levels. the VAUX application for CardBus controllers The PC Card specification requires the support of VAUX to the CardBus controller as well as to the PC Card sockets. Both are 3.3-V requirements; however the CardBus controller’s current demand from the VAUX supply is limited to 10 µA, whereas the PC Card may consume as much as 200 mA. In either implementation, if support of a wake-up event is required, the controller and the socket will transition from the 3.3-V VCC rail to the 3.3-V VAUX rail when the equipment moves into a low power mode such as D3. The transition from VCC to VAUX needs to be seamless in order to maintain all memory and register information in the system. If VAUX is not supported, the system will lose all register information when it transitions to the D3 state. |
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