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參數(shù)資料
| 型號(hào)： | TPS2114PW |
| 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 |
| 文件頁數(shù)： | 8/22頁 |
| 文件大?。?/td> | 503K |
| 代理商： | TPS2114PW |
www.ti.com
DETAILED DESCRIPTION
AUTO-SWITCHING MODE
MANUAL SWITCHING MODE
N-CHANNEL MOSFETs
CROSS-CONDUCTION BLOCKING
REVERSE-CONDUCTION BLOCKING
CHARGE PUMP
CURRENT LIMITING
OUTPUT VOLTAGE SLEW-RATE CONTROL
TPS2114
TPS2115
SLVS447A – DECEMBER 2002 – REVISED MARCH 2004
D0 equal to logic 1 and D1 equal to logic 0 selects the auto-switching mode. In this mode, OUT connects to the
higher of IN1 and IN2.
D0 equal to logic 0 selects the manual-switching mode. In this mode, OUT connects to IN1 if D1 is equal to logic
1, otherwise OUT connects to IN2.
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 turnon of a FET
switch if the output voltage is greater than the input voltage.
The switching circuitry ensures that both power switches 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 turnon threshold voltage.
When the TPS211x 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 TPS211x
does 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 remains connected regardless of output voltage.
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.
A resistor R(ILIM) from ILIM to GND sets the current limit to 250/ R(ILIM) and 500/R(ILIM) for the TPS2114 and
TPS2115, respectively. Setting resistor R(ILIM) equal to zero is not recommended as that disables current limiting.
The TPS2114/5 slews the output voltage at a slow rate when OUT switches to IN1 or IN2 from the Hi-Z state
(see Truth Table). A slow slew rate limits the inrush current into the load capacitor. High inrush currents can
adversely effect 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 like a PCI card. The TPS2114/5 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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2114PWG4 | 功能描述:電源開關(guān) IC - 配電 Dual In/Single Out Autoswitch Power MUX RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(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 |
| TPS2114PWR | 功能描述:電源開關(guān) IC - 配電 Dual In/Single Out Autoswitch Power MUX RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(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 |
| TPS2114PWRG4 | 功能描述:電源開關(guān) IC - 配電 Dual In/Single Out Autoswitch Power MUX RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(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 |
| TPS2115ADRBR | 功能描述:電源開關(guān) IC - 配電 Autoswitching Pwr Mux RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(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 |
| TPS2115ADRBRG4 | 功能描述:電源開關(guān) IC - 配電 AutoSwing Pwr Mux RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(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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