參數(shù)資料
型號(hào)： TPS2112APWR
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝： GREEN, PLASTIC, TSSOP-8
文件頁(yè)數(shù)： 9/27頁(yè)
文件大?。?/td> 714K
代理商： TPS2112APWR
www.ti.com
SBVS045B – MARCH 2004 – REVISED MARCH 2010
DETAILED DESCRIPTION
AUTO-SWITCHING MODE
The TPS2112A/3A only supports the auto-switching mode. In this mode, OUT connects to IN1 if VI(VSNS) is
greater than 0.8 V, otherwise OUT connects to the higher of IN1 and IN2.
The VSNS terminal includes hysteresis equal to 3.75% to 7.5% of the threshold selected for transition from the
primary supply to the higher of the two supplies. This hysteresis helps avoid repeated switching from one supply
to the other due to resistive drops.
N-CHANNEL MOSFETs
Two internal high-side power MOSFETs implement a single-pole double-throw (SPDT) switch. Digital logic
selects the IN1 switch, IN2 switch, or no switch (Hi-Z state). The MOSFETs have no parallel diodes so
output-to-input current cannot flow when the FET is off. An integrated comparator prevents turn-on of a FET
switch if the output voltage is greater than the input voltage.
CROSS-CONDUCTION BLOCKING
The switching circuitry ensures that both power switches will never conduct at the same time. A comparator
monitors the gate-to-source voltage of each power FET and allows a FET to turn on only if the gate-to-source
voltage of the other FET is below the turn-on threshold voltage.
REVERSE-CONDUCTION BLOCKING
When the TPS211xA switches from a higher-voltage supply to a lower-voltage supply, current can potentially
flow back from the load capacitor into the lower-voltage supply. To minimize such reverse conduction, the
TPS211xA will not connect a supply to the output until the output voltage has fallen to within 100 mV of the
supply voltage. Once a supply has been connected to the output, it will remain connected regardless of output
voltage.
CHARGE PUMP
The higher of supplies IN1 and IN2 powers the internal charge pump. The charge pump provides power to the
current limit amplifier and allows the output FET gate voltage to be higher than the IN1 and IN2 supply voltages.
A gate voltage that is higher than the source voltage is necessary to turn on the N-channel FET.
CURRENT LIMITING
A resistor RILIM from ILIM to GND sets the current limit to 250/RILIM and 500/RILIM for the TPS2112A and
TPS2113A, respectively. Setting resistor RILIM equal to zero is not recommended as that disables current limiting.
OUTPUT VOLTAGE SLEW-RATE CONTROL
The TPS2112A/3A slews the output voltage at a slow rate when OUT switches to IN1 or IN2 from the Hi-Z state
(see the Truth Table). A slow slew rate limits the inrush current into the load capacitor. High inrush currents can
glitch the voltage bus and cause a system to hang up or reset. It can also cause reliability issues—like pit the
connector power contacts, when hot-plugging a load such as a PCI card. The TPS2112A/3A slews the output
voltage at a much faster rate when OUT switches between IN1 and IN2. The fast rate minimizes the output
voltage droop and reduces the output voltage hold-up capacitance requirement.
Copyright 2004–2010, Texas Instruments Incorporated
17
Product Folder Link(s): TPS2112A TPS2113A
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TPS2112APWRG4 功能描述:電源開(kāi)關(guān) IC - 配電 Autoswitching Power Mux RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5
TPS2112PW 功能描述:電源開(kāi)關(guān) IC - 配電 Dual In/Single Out Autoswitch Power MUX RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5
TPS2112PWG4 功能描述:電源開(kāi)關(guān) IC - 配電 Dual In/Single Out Autoswitch Power MUX RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5
TPS2112PWR 功能描述:電源開(kāi)關(guān) IC - 配電 Dual In/Single Out Autoswitch Power MUX RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5
TPS2112PWRG4 功能描述:電源開(kāi)關(guān) IC - 配電 Dual In/Single Out Autoswitch Power MUX RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5
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