參數(shù)資料
型號: L4922
廠商: 意法半導(dǎo)體
英文描述: Very Lowdrop Adjustable Regulators(帶復(fù)位的低壓差穩(wěn)壓器)
中文描述: 非常Lowdrop可調(diào)穩(wěn)壓器(帶復(fù)位的低壓差穩(wěn)壓器)
文件頁數(shù): 2/6頁
文件大?。?/td> 80K
代理商: L4922
PIN CONNECTION
(Top view)
FUNCTIONAL DESCRIPTION
The operating principle of the voltage regulator is
based on the reference, the error amplifier, the
driver and the power PNP. This stageuses an Iso-
lated Collector Vertical PNPtransistor whichallows
to obtainverylow dropoutvoltage(typ. 450mV)and
lowquiescentcurrent(I
Q
=20mAtypicallyatI
o
= 1A).
Thanks to these featuresthe device is particularly
suited when the power dissipation must be limited
as,for example, in automotiveor industrialapplica-
tionssuppliedby battery.
The three gain stages (operational amplifier,
driver and power PNP) require the externalcapaci-
tor (Co
min
= 22
μ
F) to guaranteethe global stability
of the system.
Theantisaturationcircuitallowstoreducedrastically
the current peakwhich takes placeduring thestart
up.
The reset function is LOW active when the output
voltage level is lower thanthe reset threshold volt-
ageV
RthOFF
(typ.value:V
o
–150mV).Whentheout-
putvoltageis higherthanV
RthON
theresetbecomes
HIGHafteradelaytimesettablewiththeexternalca-
pacitor C
d
. Typically t
d
= 20ms, C
d
= 0.1
μ
F. The re-
set and delay threshold hysteresis improve the
noise immunity allowing to avoid false switchings.
The typicalresetoutputwaveformis shownin fig.1.
ABSOLUTE MAXIMUM RATINGS
Symbol
V
i
V
r
V
D
T
J
T
op
T
stg
Parameter
Value
35
–18
60
–40 to 150
–40 to 125
–55 to 150
Unit
V
V
V
°
C
°
C
°
C
DC Input Voltage
DC Reverse Voltage
Positive Load Dump Protection (t = 300ms)
Junction Temperature Range
Operating Temperature Range
Storage Temperature Range
THERMAL DATA
Symbol
R
th j-case
Parameter
Value
3.5
Unit
°
C/W
Thermal Resistance Junction-case
Max.
Note:
The circuit is ESD protected according to MIL-STD-883C
L4922
2/6
相關(guān)PDF資料
PDF描述
L4923 Low Drop Regulator With Reset and Inhibit(帶禁止和復(fù)位的低壓差穩(wěn)壓器)
L4925 Very Low Drop Voltage Regulator(低壓差穩(wěn)壓器)
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L4923 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WITH RESET AND INHIBIT 5V.1A VERY LOW DROP REGULATOR
L4925 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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
L4925H 制造商:未知廠家 制造商全稱: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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20