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參數(shù)資料
| 型號(hào)： | L4902A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DUAL 5V REGULATOR WITH RESET AND DISABLE |
| 中文描述： | 5V的雙帶復(fù)位和禁用調(diào)節(jié)器 |
| 文件頁(yè)數(shù)： | 4/9頁(yè) |
| 文件大?。?/td> | 113K |
| 代理商： | L4902A |
TESTCIRCUIT
APPLICATION INFORMATION
In powersuppliesfor
μ
Psystemsit is necessaryto
provide power continuously to avoid loss of infor-
mationin memoriesandin timeof dayclocks,or to
savedatawhen theprimarysupplyisremoved.The
L4902A makes it very easy to supply such equip-
ments ;it providestwovoltageregulators(both 5V
high precision) with common inputs plus a reset
output for the data save function and a Reg. 2
disableinput.
CIRCUIT OPERATION (see Figure 1)
After switch on Reg. 1 saturates until V
01
rises to
the nominal value.
When the input reaches V
IT
and the output 1 is
higherthanV
RT
theoutput2 (V
02
) switcheson and
the reset output (V
R
) also goes high after a pro-
Figure 1
grammabletime T
RD
(timingcapacitor).
V
02
andV
R
areswitchedtogetherat lowlevelwhen
one of the following conditionsoccurs :
- a high level ( V
DT
) is appliedon pin 3 ;
- an input overvoltage;
- an overloadon the output 1 (V
01
V
RT
) ;
- a switch off (V
IN
V
IT
- V
ITH
) ;
and they start again as beforewhen the condition
is removed.
An overload on output 2 does not switch Reg. 2,
and does not influenceReg.1.
TheV
01
outputfeatures:
- 5V internal reference without voltage divider be-
tweenthe output and the error comparator
- very low drop series regulator element utilizing
current mirrors
permit high output impedance and then very low
leakagecurrent even in powerdown condition.
L4902A
4/9
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| L4902AH | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Positive Fixed Voltage Regulator |
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| L4904A | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) Dual 5V 0.05/0.1A RoHS:否 制造商:STMicroelectronics 輸出類(lèi)型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| L4905 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Positive Fixed Voltage Regulator |
| L4909 | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) EXTERNALLY ADJUST MULTIFUNCTION REG RoHS:否 制造商:STMicroelectronics 輸出類(lèi)型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
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