參數(shù)資料
型號： L4937NPD
廠商： 意法半導(dǎo)體
英文描述： Dual 5V Multifunction Voltage Regulator(雙5V多功能電壓穩(wěn)壓器)
中文描述： 雙5V的多功能穩(wěn)壓器（雙5V的多功能電壓穩(wěn)壓器）
文件頁數(shù)： 5/9頁
文件大小： 78K
代理商： L4937NPD
FUNCTIONAL DESCRIPTION
TheL4937NDisbasedontheSGS-THOMSONMi-
croelectronicsmodularvoltageregulatorapproach.
Several out-standing features and auxiliary func-
tionsareprovidedto meettherequirementsof sup-
plyingthemicroprocessorsystemsusedinautomo-
tiveapplications.
Furthermorethe deviceis suitablealso in otherap-
plications requiringtwostabilized voltages.
The modular approach allows other features and
functionsto berealized easily whenrequired.
STANDBYREGULATOR
The standby regulator uses an Isolated Collector
Vertical PNP transistor as the regulating element.
This structure allows a very low dropoutvoltage at
currents up to 50mA. The dropout operationof the
standby regulator is maintained down to 2V input
supply voltage. The output voltage is regulatedup
tothetransientinputsupplyvoltageof40V.Thisfea-
ture avoidsfunctionalinterruptions whichcouldbe
generatedby overvoltagepulses.
Figure1 :
OutputVoltagevs. InputVoltage.
The typical curve of the standbyoutputvoltageas a
functionof theinputsupplyvoltageisshowninfig.1.
The current consumption of the device (quiescent
current) is less than 260
μ
A when output 2 is dis-
abled(standbymode). The dropoutvoltageis con-
trolled to reduce the quiescent current peak in the
undervoltage region and to improve the transient
responsein thisregion.
Thequiescentcurrentisshowninfig.2asafunction
of thesupplyinputvoltage2.
OUTPUT2 VOLTAGE
The output2 regulatorusesthe sameoutputstruc-
tureasthestandbyregulator,butratedforanoutput
current of 500mA.
The output2 regulatorworks in trackingmode with
the standby output voltage as a reference voltage
when the output2.
The output 2 regulator can be switched off via the
Enableinput.
Note :
1: Foldbackcharacteristic
ELECTRICAL CHARACTERISTICS
(continued)
RESET
Symbol
V
Rt
V
Rth
t
RD
t
RR
V
RL
Parameter
Test Conditions
Min.
V
o1
-0.4
50
55
1
Typ.
4.7
100
100
10
Max.
V
o1
-0.1
200
180
50
0.4
Unit
V
mV
ms
μ
s
V
ResetLow Threshold Voltage
ResetThreshold Hysteresis
ResetPulse Delay
ResetReaction Time
ResetOutput LOW Voltage
C
T
= 100nF;t
R
> 100
μ
s
C
T
= 100nF
R
RES
= 10K
to V
01
V
S
= 1.5V
V
RES
= 5V
I
LRES
V
CTh
V
CTh,hyst
ResetOutput HIGH Leakage
Delay Comparator Threshold
Delay Comparator Threshold
Hysteresis
1
μ
A
V
mV
2.0
100
L4937NPD
5/9
相關(guān)PDF資料
PDF描述
L4937 DUAL MULTIFUNCTION VOLTAGE REGULATOR
L4937N DUAL MULTIFUNCTION VOLTAGE REGULATOR
L4938E ADVANCED VOLTAGE REGULATOR
L4938ED ADVANCED VOLTAGE REGULATOR
L4938EPD ADVANCED VOLTAGE REGULATOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L4938E 功能描述:低壓差穩(wěn)壓器 - LDO Dual 5V Very 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(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
L4938ED 功能描述:低壓差穩(wěn)壓器 - LDO Dual 5V Very 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(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
L4938ED013TR 功能描述:低壓差穩(wěn)壓器 - LDO Dual 5V Very 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(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
L4938EDTR-E 制造商:STMicroelectronics 功能描述:PTS SMARTPOWER - Tape and Reel 制造商:STMicroelectronics 功能描述:Advanced Voltage Reg 3.8V to 4.7V 65uA
L4938EPD 功能描述:低壓差穩(wěn)壓器 - LDO Dual 5V Very 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(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
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