參數(shù)資料
型號(hào)： TPS79018DBVR
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
中文描述： 三端固定電壓調(diào)節(jié)器
文件頁(yè)數(shù)： 14/16頁(yè)
文件大小： 280K
代理商： TPS79018DBVR
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50 mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299A – SEPTEMBER 2000 – REVISED SEPTEMBER 2000
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
external capacitor requirements (continued)
The external bypass capacitor, used in conjunction with an internal resistor to form a low-pass filter, should be
a low ESR ceramic capacitor. For example, the TPS79030 exhibits only 56
μ
V
RMS
of output voltage noise using
a 0.01
μ
F ceramic bypass capacitor and a10
μ
F ceramic output capacitors. Note that the output will start up
slower as the bypass capacitance increases due to the RC time constant at the bypass pin that is created by
the internal 150 k
resistor and external capacitor.
power dissipation and junction temperature
Specified regulator operation is assured to a junction temperature of 125
°
C; the maximum junction temperature
should be restricted to 125
°
C under normal operating conditions. This restriction limits the power dissipation
the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits,
calculate the maximum allowable dissipation, P
D(max)
, and the actual dissipation, P
D
, which must be less than
or equal to P
D(max)
.
The maximum-power-dissipation limit is determined using the following equation:
PD(max)
TJmax
TA
RJA
Where:
T
J
max
is the maximum allowable junction temperature.
R
θ
JA
is the thermal resistance junction-to-ambient for the package, i.e., 285
°
C/W for the 5-terminal
SOT23.
T
A
is the ambient temperature.
The regulator dissipation is calculated using:
PD
VI
VO
IO
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the
thermal protection circuit.
regulator protection
The TPS790xx PMOS-pass transistor has a built-in back diode that conducts reverse current when the input
voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the
input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might
be appropriate.
The TPS790xx features internal current limiting and thermal protection. During normal operation, the TPS790xx
limits output current to approximately 350 mA. When current limiting engages, the output voltage scales back
linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure,
care should be taken not to exceed the power dissipation ratings of the package. If the temperature of the device
exceeds approximately 165
°
C, thermal-protection circuitry shuts it down. Once the device has cooled down to
below approximately 140
°
C, regulator operation resumes.
相關(guān)PDF資料
PDF描述
TPS79025DBVR THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
TPS79028DBVR THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
TPS79030DBVR THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
TPS79030DBVT THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
TPS79718DCKR VOLT REGULATOR|FIXED|+1.8V|CMOS|TSSOP|6PIN|PLASTIC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS79018DBVRG4 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise 50-mA 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS79018DBVT 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise 50-mA 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS79018DBVTG4 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise 50-mA 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS79025DBVR 功能描述:低壓差穩(wěn)壓器 - LDO 50mA 2.5V 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS79025DBVRG4 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise 50-mA 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)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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