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參數(shù)資料
| 型號： | L4938E |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | ADVANCED VOLTAGE REGULATOR |
| 中文描述： | 高級穩(wěn)壓器 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 101K |
| 代理商： | L4938E |
FUNCTIONAL DESCRIPTION
The L4938E/ED/EPD is a monolithic integrated
dual voltage regulator, based on the STM modu-
lator voltage regulator approach. Several out-
standing features and auxiliary functions are im-
plemented to meet the requirements of supplying
microprocessor systems in automotive applica-
tions. Nevertheless, it is suitable also in other ap-
plications where two stabilized voltages are re-
quired. The modular approach of this device
allows to get easly also other features and func-
tionswhen required.
Standby Regulator
The standby regulator uses an Isolated collector
Vertical PNP transistor as a regulating element.
With this structure very low dropout volotage at
currents up to 100mA is obtained. The dropout
operation of the standby regulator is maintained
down to 3V input supply voltage. The output volt-
age is regulated up to the transient input supply
voltage of 40V. With this feature no functional in-
terruptiondue to overvoltagepulses is generated.
In the standby mode when the output 2 is dis-
abled, the current consumption of the device (qui-
escent current) is less than 90
μ
A (14V supply
voltage).
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. A second regulation path will keep the
output voltage without load below 5.5V even at
high temperatures.
Output 2 Voltage
The output 2 regulator uses the same output
structure as the standby regulator but rated for
the output current of 400mA. The output voltage
is internally fixed to 5V if ADJ is connected to
V
OUT2
.
The output 2 regulator can be switches OFF via
the enable input.
REG1
1.23V
REFERENCE
REG2
1.23V
RESET
1.4V
1.23V
1.23V
SENSE
VS1
VS2
EN
PR
SI
SO
RES
CT
ADJ
OUT2
OUT1
GND
D94AT079A
15V
100K
C
S
(Note 8)
for example
BZX97C15
CT (Note 7)
C
O2
C
O1
V
OUT1
R
SO
Figure 1. ApplicationDiagram.
1.23V
D94AT080
-
+
R
1i
R
2i
OUT2
ADJ
R
1E
R
2E
R
ADJ
total 100K
typical
Figure2.
L4938E - L4938ED - L4938EPD
5/12
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L4938ED | ADVANCED VOLTAGE REGULATOR |
| L4938EPD | ADVANCED VOLTAGE REGULATOR |
| L4938NPD | DUAL MULTIFUNCTION VOLTAGE REGULATOR |
| L4938N | DUAL MULTIFUNCTION VOLTAGE REGULATOR |
| L4938ND | DUAL MULTIFUNCTION VOLTAGE REGULATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| L4938EPD13TR | 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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