參數(shù)資料
型號(hào)： L4949EP
廠商： 意法半導(dǎo)體
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： MULTIFUNCTION VERY LOW DROP VOLTAGE REGULATOR
中文描述： 多功能很好低壓降穩(wěn)壓器
文件頁(yè)數(shù)： 4/10頁(yè)
文件大?。?/td> 77K
代理商： L4949EP
APPLICATION INFORMATION
Supply Voltage Transient
High supply voltage transients can cause a reset
output signaldisturbation.
For supply voltages greater than 8V the circuit
shows a high immunity of the reset output against
supply transientsof morethan100V/
μ
s.
For supply voltages less than 8V supply tran-
sients of more than 0.4V/
μ
s can cause a reset
signal disturbation.
To improve the transient behaviour for supply
voltages less than 8V a capacitor at pin 3 can be
used.
A capacitor at pin 3 (C3
≤
1
μ
F) reduces also the
output noise.
FUNCTIONAL DESCRIPTION
The L4949E is a monolithic integrated voltage
regulator, based on the STM modular voltage
regulator approch. Several outstanding features
and auxiliary functions are implemented to meet
the requirements of supplying microprocessor
systems in automotiveapplications. Nevertheless,
it is suitable also in other applications where the
present functions are required. The modular ap-
proach of this device allows to get easily also
other featuresand functions when required.
Voltage Regulator
The voltage regulator uses an Isolated Collector
Vertical PNP transistor as a regulating element.
Figure1:
FoldbackCharacteristic of V
O
REG
1.23V
REF
SI
SO
RES
GND
D96AT219
PREREGULATOR 5V
V
S
2
μ
+
RESET
2V
SENSE
V
S
1.23V
V
OUT
V
Z(optional)
V
BAT
CT
V
OUT
APPLICATION CIRCUIT
For stability: C
S
≥
1
μ
F, C
O
≥
4.7
μ
F, ESR < 10
at 10KHz
Recommended for application:C
S
= C
O
= 10
μ
F to 100
μ
F
L4949E
4/10
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L4949EP013TR 功能描述:低壓差穩(wěn)壓器 - LDO 5V Multifunction 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
L4949EP-E 功能描述:低壓差穩(wěn)壓器 - LDO Multi Low Drop Volt 5V to 28V 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
L4949EPTR-E 功能描述:低壓差穩(wěn)壓器 - LDO Multi Low Drop Volt 5V to 28V 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
L4949N 功能描述:低壓差穩(wěn)壓器 - LDO 5V 100mA w/Power-On 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
L4949NG 功能描述:低壓差穩(wěn)壓器 - LDO 5V 100mA w/Power-On 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
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