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參數(shù)資料
| 型號(hào)： | L4949N |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | MULTIFUNCTION VERY LOW DROPOUT VOLTAGE REGULATOR |
| 中文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 0.5 V DROPOUT, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 191K |
| 代理商： | L4949N |
L4949
6
MOTOROLA ANALOG IC DEVICE DATA
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 systems in automotive
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.
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 13.
The current consumption of the device (quiescent current)
is less than 200
μ
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 14.
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 12.
0
5.0
20
100
200
Iout (mA)
Figure 12. Foldback Characteristic of Vout
V
10
Vout
5.0 V
35 V
5.0 V
2.0 V
0 V
Vout
VCC
Figure 13. Output Voltage versus Supply Voltage
3.0
Figure 14. Quiescent Current versus Supply Voltage
2.5
2.0
1.5
1.0
0
5.0
10
15
20
25
30
VCC, SUPPLY VOLTAGE (V)
0.5
0
RL = 5.0 k
RL = 100
TJ = 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 (VZ). This voltage should not be used as an
output because the output capability is very small (
≤
100
μ
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
μ
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 |
|---|---|
| L4949NG | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 100mA w/Power-On Reset 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 |
| L4952 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:VOLTAGE REGULATOR FOR CAR RADIO APPLICATIONS |
| L4952D | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) 8.6V 0.15A LDO RoHS:否 制造商:STMicroelectronics 輸出類型: 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 |
| L4952D013TR | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) 8.6V 0.15A LDO RoHS:否 制造商:STMicroelectronics 輸出類型: 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 |
| L4952TS | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3.1W Stereo-SE Audio Power Amplifier with DC Volume Control |
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