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參數(shù)資料
| 型號： | L4949ED |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準電壓源/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 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 77K |
| 代理商： | L4949ED |
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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| L4949EP | MULTIFUNCTION VERY LOW DROP VOLTAGE REGULATOR |
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| L4959 | MULTIFUNCTION VOLTAGE REGULATOR FOR HOME AUDIO |
| L4960 | Isolated Flyback Switching Regulator with 9V Output |
| L4960H | Isolated Flyback Switching Regulator with 9V Output |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L4949ED013TR | 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L4949ED013TR-1LF | 制造商:STMicroelectronics 功能描述:REG LDO LIN FIX POS 5V 0.1A 8SOIC - Tape and Reel |
| L4949ED013TR-5 | 制造商:STMicroelectronics 功能描述:REG LDO LIN FIX POS 5V 0.1A 8SOIC NON ROHS - Tape and Reel |
| L4949ED013TR-VI | 制造商:STMicroelectronics 功能描述:REG LDO LIN FIX POS 5V 0.1A 8SOIC LEADED - Tape and Reel |
| L4949ED-E | 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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