參數(shù)資料
型號(hào)： TPS7348y
廠商： Texas Instruments, Inc.
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： Low-Dropout Voltage Regulators(帶RESET功能，低壓差PMOS穩(wěn)壓器)
中文描述： 低壓差穩(wěn)壓器（帶復(fù)位功能，PMOS的低壓差穩(wěn)壓器）
文件頁(yè)數(shù)： 33/37頁(yè)
文件大?。?/td> 839K
代理商： TPS7348Y
TPS7301Q, TPS7333Q, TPS7348Q, TPS7350Q
LOW-DROPOUT VOLTAGE REGULATORS
WITH INTEGRATED DELAYED RESET FUNCTION
SLVS124D – JUNE 1995 – REVISED JANUARY 1997
33
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
undervoltage supervisor function (continued)
Transient loads or line pulses can also cause a reset to occur if proper care is not taken in selecting the input
and output capacitors. Load transients that are faster than 5
μ
s can cause a reset if high-ESR output capacitors
(greater than approximately 7
) are used. A 1-
μ
s transient causes a reset when using an output capacitor with
greater than 3.5
of ESR. It is interesting to note that the output-voltage spike during the transient can drop
well below the reset threshold and still not trip if the transient duration is short. A 1-
μ
s transient must drop at
least 500 mV below the threshold before tripping the reset circuit. A 2-
μ
s transient trips RESET at just 400 mV
below the threshold. Lower-ESR output capacitors help by reducing the drop in output voltage during a transient
and should be used when fast transients are expected.
NOTE:
V
IT+
= V
IT–
+Hysteresis
output noise
The TPS73xx has very low output noise, with a spectral noise density < 2
μ
V/
√
Hz. This is important when
noise-susceptible systems, such as audio amplifiers, are powered by the regulator.
regulator protection
The TPS73xx PMOS-pass transistor has a built-in back diode that safely conducts reverse currents 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 is anticipated, external limiting might be
appropriate.
The TPS73xx also features internal current limiting and thermal protection. During normal operation, the
TPS73xx limits output current to approximately 1 A. 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 165
°
C, thermal-protection circuitry shuts it down. Once the device has cooled, regulator
operation resumes.
相關(guān)PDF資料
PDF描述
TPS7350Y Low-Dropout Voltage Regulators(帶延遲復(fù)位功能的低壓差穩(wěn)壓器)
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TPS730XX_07 LOW-NOISE, HIGH PSRR, RF 200-mA LOW-DROPOUT LINEAR REGULATORS
TPS73615DBV Cap-Free, NMOS, 400mA Low-Dropout Regulator with Reverse Current Protection
TPS73612DBV Cap-Free, NMOS, 400mA Low-Dropout Regulator with Reverse Current Protection
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TPS73501DRVT 功能描述:低壓差穩(wěn)壓器 - LDO Sgl Output LDO,500mA Adj,Low Quies Crnt 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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