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參數(shù)資料
| 型號： | TPS79929 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 200mA Low Quiescent Current, Ultra-Low Noise, High PSRR, Low Dropout Linear Regulator |
| 中文描述： | 200mA低靜態(tài)電流，超低噪聲，高PSRR，低壓差線性穩(wěn)壓 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 377K |
| 代理商： | TPS79929 |
www.ti.com
Transient Response
As with any regulator, increasing the size of the output capacitor will reduce over/undershoot magnitude but
increase duration of the transient response. In the adjustable version, adding C
between OUT and FB will
improve stability and transient response. The transient response of the TPS799xx is enhanced by an active
pull-down that engages when the output overshoots by approximately 5% or more when the device is enabled.
When enabled, the pull-down device behaves like a 350
resistor to ground.
Under-Voltage Lock-Out (UVLO)
The TPS799xx utilizes an under-voltage lock-out circuit to keep the output shut off until internal circuitry is
operating properly. The UVLO circuit has a de-glitch feature so that it will typically ignore undershoot transients
on the input if they are less than 50μs duration.
Minimum Load
The TPS799xx is stable and well-behaved with no output load. To meet the specified accuracy, a minimum load
of 500μA is required. Below 500μA at junction temperatures near +125°C, the output can drift up enough to
cause the output pull-down to turn on. The output pull-down will limit voltage drift to 5% typically but ground
current could increase by approximately 50μA. In typical applications, the junction cannot reach high
temperatures at light loads since there is no appreciable dissipated power. The specified ground current would
then be valid at no load in most applications.
Thermal Information
Thermal Protection
Thermal protection disables the output when the junction temperature rises to approximately +165°C, allowing
the device to cool. When the junction temperature cools to approximately +145°C the output circuitry is again
enabled. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection
circuit may cycle on and off. This cycling limits the dissipation of the regulator, protecting it from damage due to
overheating.
Power Dissipation
The ability to remove heat from the die is different for each package type, presenting different considerations in
the PCB layout. The PCB area around the device that is free of other components moves the head from the
device to the ambient air. Performance data for JEDEC low- and high-K boards are given in the
Dissipation
Ratings
table. Using heavier copper will increase the effectiveness in removing heat from the device. The
addition of plated through-holes to heat-dissipating layers will also improve the heatsink effectiveness.
P
D
V
IN
V
OUT
I
OUT
(2)
Package Mounting
www.ti.com.
TPS79901, TPS79915, TPS79916, TPS79918
TPS79925, TPS79927, TPS79928, TPS799285
TPS79929, TPS79930, TPS79932, TPS79933
SBVS056C–JANUARY 2005–REVISED MAY 2005
Any tendency to activate the thermal protection circuit indicates excessive power dissipation or an inadequate
heatsink. For reliable operation, junction temperature should be limited to +125°C maximum. To estimate the
margin of safety in a complete design (including heatsink), increase the ambient temperature until the thermal
protection is triggered; use worst-case loads and signal conditions. For good reliability, thermal protection should
trigger at least +35°C above the maximum expected ambient condition of your particular application. This
configuration produces a worst-case junction temperature of +125°C at the highest expected ambient
temperature and worst-case load.
The internal protection circuitry of the TPS799xx has been designed to protect against overload conditions. It
was not intended to replace proper heatsinking. Continuously running the TPS799xx into thermal shutdown will
degrade device reliability.
Power dissipation depends on input voltage and load conditions. Power dissipation is equal to the product of the
output current time the voltage drop across the output pass element, as shown in
Equation 2
:
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS79930DDCR | 功能描述:低壓差穩(wěn)壓器 - LDO 200mA High PSRR LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS79930DDCRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO 200mA High PSRR LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS79930DDCT | 功能描述:低壓差穩(wěn)壓器 - LDO 200mA High PSRR LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS79930DDCTG4 | 功能描述:低壓差穩(wěn)壓器 - LDO 200mA High PSRR LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS79930YZUR | 功能描述:低壓差穩(wěn)壓器 - LDO 200mA High PSRR LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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