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參數(shù)資料
| 型號(hào)： | NCV4949 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 100 mA, 5.0 V, Low Dropout Voltage Regulator with Power-On Reset(100 mA, 5.0 V, 具有上電復(fù)位功能的低壓差穩(wěn)壓器) |
| 中文描述： | 一○○毫安，5.0 V固定，低壓差線性穩(wěn)壓器的上電復(fù)位（100毫安，5.0五，具有上電復(fù)位功能的低壓差穩(wěn)壓器） |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 116K |
| 代理商： | NCV4949 |
L4949, NCV4949
http://onsemi.com
7
OPERATING DESCRIPTION
The L4949 is a monolithic integrated low dropout voltage
regulator. Several outstanding features and auxiliary
functions are implemented to meet the requirements of
supplying
microprocessor
applications. Nevertheless, it is suitable also in other
applications where the present functions are required. The
modular approach of this device allows the use of other
features and functions independently when required.
systems
in
automotive
Voltage Regulator
The voltage regulator uses an isolated Collector Vertical
PNP transistor as a regulating element. With this structure,
very low dropout voltage at currents up to 100 mA is
obtained. The dropout operation of the standby regulator is
maintained down to 3.0 V input supply voltage. The output
voltage is regulated up to the transient input supply voltage
of 35 V. With this feature no functional interruption due to
overvoltage pulses is generated.
The typical curve showing the standby output voltage as
a function of the input supply voltage is shown in Figure 14.
The current consumption of the device (quiescent current)
is less than 200 A.
To reduce the quiescent current peak in the undervoltage
region and to improve the transient response in this region,
the dropout voltage is controlled. The quiescent current as
a function of the supply input voltage is shown in Figure 15.
Short Circuit Protection:
The maximum output current is internally limited. In case
of short circuit, the output current is foldback current limited
as described in Figure 13.
0
5.0
20
100
200
I
out
(mA)
Figure 13. Foldback Characteristic of V
out
V
10
V
out
5.0 V
35 V
5.0 V
2.0 V
0 V
V
out
V
CC
Figure 14. Output Voltage versus Supply Voltage
3.0
Figure 15. Quiescent Current versus Supply Voltage
2.5
2.0
1.5
1.0
0
5.0
10
15
20
25
30
V
CC
, SUPPLY VOLTAGE (V)
0.5
0
R
L
= 5.0 k
R
L
= 100
T
J
= 25
°
C
I
Preregulator
To improve the transient immunity a preregulator
stabilizes the internal supply voltage to 6.0 V. This internal
voltage is present at Pin 3 (V
Z
). This voltage should not be
used as an output because the output capability is very small
(
≤
100 A).
This output may be used as an option when better transient
behavior for supply voltages less than 8.0 V is required. In
this case a capacitor (100 nF 1.0 F) must be connected
between Pin 3 and GND. If this feature is not used Pin 3 must
be left open.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV4949A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:100 mA, 5.0 V, Low Dropout Voltage Regulator with Reset and Sense |
| NCV4949ADR2G | 功能描述:低壓差穩(wěn)壓器 - LDO 5.0V 100 MA 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(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 |
| NCV4949ADWR2G | 功能描述:低壓差穩(wěn)壓器 - LDO 5.0V 100 MA 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(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 |
| NCV4949APDR2G | 功能描述:低壓差穩(wěn)壓器 - LDO 5.0V 100 MA 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(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 |
| NCV4949DG | 功能描述:低壓差穩(wěn)壓器 - LDO ANA OSPI MULTIFNCTN 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 |
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