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參數(shù)資料
| 型號： | LT1521CST-3.3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | OCTAL BUS TRANSCEIVER/IOL=48mA O.C. 20-SOIC 0 to 70 |
| 中文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.75 V DROPOUT, PDSO4 |
| 封裝： | PLASTIC, SOT-223, 4 PIN |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 294K |
| 代理商： | LT1521CST-3.3 |
12
LT1521/LT1521-3
LT1521-3.3/LT1521-5
APPLICATIO
S I
FOR
ATIO
U
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled to
ground, pulled to some intermediate voltage or is left open
circuit. Current flow back into the output will vary depend-
ing on the conditions. Many battery-powered circuits
incorporate some form of power management. The fol-
lowing information will help optimize battery life. Table 4
summarizes the following information.
The reverse output current will follow the curve in Figure
3 when the input is pulled to ground. This current flows
through the output pin to ground. The state of the shut-
down pin will have no effect on output current when the
input pin is pulled to ground.
In some applications it may be necessary to leave the input
on the LT1521 unconnected when the output is held high.
This can happen when the LT1521 is powered from a
W
U
U
Figure 3. Reverse Output Current
rectified AC source. If the AC source is removed, then the
input of the LT1521 is effectively left floating. The reverse
output current also follows the curve in Figure 3 if the input
pin is left open. The state of the shutdown pin will have no
effect on the reverse output current when the input pin is
floating.
When the input of the LT1521 is forced to a voltage below
its nominal output voltage and its output is held high, the
output current will follow the curve shown in Figure 3. This
can happen if the input of the LT1521 is connected to a
discharged (low voltage) battery and the output is held up
by either a backup battery or by second regulator circuit.
When the input pin is forced below the output pin or the
output pin is pulled above the input pin, the input current
will typically drop to less than 2
μ
A (see Figure 4). The state
of the shutdown pin will have no effect on the reverse
output current when the output is pulled above the input.
OUTPUT VOLTAGE (V)
0
R
μ
A
50
45
40
35
30
25
20
15
10
5
0
8
LT1521 F03
3
5
7
9
4
6
10
T
J
= 25
°
C
V
= 0V
CURRENT FLOWS
INTO OUTPUT PIN
V
= V
(LT1521-3/LT1521-3.3
LT1521-5)
V
OUT
= V
ADJ
(LT1521)
LT1521
LT1521-3.3
LT1521-3
LT1521-5
2
1
INPUT VOLTAGE (V)
0
I
μ
A
5
4
3
2
1
0
4
LT1521 F04
1
2
3
5
V
OUT
= 3V (LT1521-3)
V
OUT
= 3.3V (LT1521-3.3)
V
OUT
= 5V (LT1521-5)
LT1521-3
LT1521-3.3
LT1521-5
Figure 4. Input Current
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1521CST-5 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LT1521IS8-3 | OCTAL BUS TRANSCEIVER/IOL=48mA O.C. 20-PDIP 0 to 70 |
| LT1521IS8-3.3 | OCTAL BUS TRANSCEIVER/IOL=48mA O.C. 20-PDIP 0 to 70 |
| LT1521IS8-5 | OCTAL BUS TRANSCEIVER/IOL=48mA O.C. 20-SO 0 to 70 |
| LT1521IST-3 | OCTAL BUS TRANSCEIVER/IOL=48mA O.C. 20-SO 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1521CST33TR | 制造商:Linear Technology 功能描述: |
| LT1521CST5 | 制造商:LT 功能描述:* |
| LT1521CST-5 | 功能描述:IC REG LDO 5V .3A SOT223-3 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓模塊:More Information on LDOs 標準包裝:50 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:3.3V 輸入電壓:最高 15V 電壓 - 壓降（標準）:1.1V @ 800mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:800mA 電流 - 限制（最?。?800mA 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-4，D²Pak（3 引線+接片），TO-263AA 供應商設(shè)備封裝:D2PAK-3 包裝:管件 |
| LT1521CST-5#PBF | 功能描述:IC REG LDO 5V .3A SOT223-3 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:1 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:8V 輸入電壓:10.5 V ~ 23 V 電壓 - 壓降（標準）:1.7V @ 40mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:100mA（最小值） 電流 - 限制（最?。?- 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設(shè)備封裝:8-SOIC 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:1075 (CN2011-ZH PDF) 其它名稱:296-24390-1 |
| LT1521CST-5#TR | 功能描述:IC REG LDO 5V .3A SOT223-3 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓模塊:More Information on LDOs 標準包裝:50 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:3.3V 輸入電壓:最高 15V 電壓 - 壓降（標準）:1.1V @ 800mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:800mA 電流 - 限制（最?。?800mA 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-4，D²Pak（3 引線+接片），TO-263AA 供應商設(shè)備封裝:D2PAK-3 包裝:管件 |
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