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參數(shù)資料
APPLICATION NOTE
SUPPLYVOLTAGETRANSIENTS
High supply voltage transients can cause a reset
output signaldisturbation.
For supply voltage greater than 8V the circuit
shows a high immunity of the reset output against
supply transientsof morethan100V/
μ
s.
For supply voltage lower than 8V, supply tran-
sients of more than 0.4V/
μ
s. can cause a reset
signal disturbation.
FoldbackCharacteristics Of Vo
FUNCTIONAL DESCRIPTION
The L4925 is a monolithic integrated voltage
regulator, based on the STM modular voltage
regulator approach. Several outstanding features
and auxiliary functions are implemented to meet
the requirements of supplying microprocessor
systems in automotiveapplications.
Nevetrheless, it is suitable also in other applica-
tions where the present functions are required.
The modular approachof thisdevice allows to get
easily also other features and functions when re-
quired.
VOLTAGE REGULATOR
The voltage regulator uses an Isolated Collector
Vertical PNP transistor as a regulating element.
With this structure very low dropout voltage at
currents up to 500mAis obtained.
The dropout operation of the standby regulator is
maintained down to 3V input supply voltage. The
output voltage is regulated up to the transient in-
put supply voltage of 35V. With this feature no
functional interruption due to overvoltage pulses
is generated.
The typical curve showing the standby output
voltageas a functionof the input supply voltageis
shown in fig. 1.
The current consumption of the device (quiescent
current) is less than 250
μ
A.
To reduce the quiescent current peak in the un-
dervoltageregion and to improve the transient re-
sponse in this region, the dropout voltage is con-
trolled.
The quiescent current as a functionof the supply
input voltage is shown in fig. 2.
Figure 1:
OutputVoltage vs. Input Voltage
Figure2:
QuiescentCurrent vs. Supply Voltage
L4925
4/8
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L4931 | Very Low Drop Voltage Regulators with Inhibit(帶禁止低壓差電壓穩(wěn)壓器) |
| L4936E | ADVANCED VOLTAGE REGULATOR |
| L4936EH | ADVANCED VOLTAGE REGULATOR |
| L4936N | DUAL MULTIFUNCTION VOLTAGE REGULATOR |
| L4936NH | DUAL MULTIFUNCTION VOLTAGE REGULATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L4925H | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Positive Fixed Voltage Regulator |
| L4925L | 功能描述:低壓差穩(wěn)壓器 - LDO V Low-Drop Volt Reg 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 |
| L4925PD | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 0.5A w/Reset 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 |
| L4925PD013TR | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 0.5A w/Reset 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 |
| L4926 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Positive Fixed Voltage Regulator |
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