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參數資料
| 型號： | MC33275DT-2.5RK |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | LOW DROPOUT MICROPOWER VOLTAGE REGULATOR |
| 中文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.5 V DROPOUT, PSSO3 |
| 封裝： | DPAK-4 |
| 文件頁數： | 7/12頁 |
| 文件大小： | 197K |
| 代理商： | MC33275DT-2.5RK |
MC33275
http://onsemi.com
7
APPLICATIONS INFORMATION
LOAD
C
out
V
out
V
in
C
in
GND
MC33275–XX
Figure 14. Typical Application Circuit
The MC33275 regulators are designed with internal
current limiting and thermal shutdown making them
user–friendly. Figure 14 is a typical application circuit. The
output capability of the regulator is in excess of 300 mA,
with a typical dropout voltage of less than 260 mV. Internal
protective features include current and thermal limiting.
EXTERNAL CAPACITORS
These regulators require only a 0.33 F (or greater)
capacitance between the output and ground for stability for
2.5 V, 3.0 V, and 3.3 V output voltage options. Output
voltage options of 5.0 V require only 0.22 F for stability.
The output capacitor must be mounted as close as possible
to the MC33275. If the output capacitor must be mounted
further than two centimeters away from the MC33275, then
a larger value of output capacitor may be required for
stability. A value of 0.68 F or larger is recommended. Most
type of aluminum, tantalum, or multilayer ceramic will
perform adequately. Solid tantalums or appropriate
multilayer ceramic capacitors are recommended for
operation below 25
°
C. An input bypass capacitor is
recommended to improve transient response or if the
regulator is connected to the supply input filter with long
wire lengths, more than 4 inches. This will reduce the
circuit’s sensitivity to the input line impedance at high
frequencies. A 0.33 F or larger tantalum, mylar, ceramic,
or other capacitor having low internal impedance at high
frequencies should be chosen. The bypass capacitor should
be mounted with shortest possible lead or track length
directly across the regulator’s input terminals. Figure 15
shows the ESR that allows the LDO to remain stable for
various load currents.
0
100
E
LOAD CURRENT (mA)
100
200
300
10
1.0
0.1
Figure 15. ESR for V
out
= 3.0V
V
out
= 3.0 V
C
out
= 1.0 F
C
in
= 1.0 F
50
150
250
Stable Region
Applications should be tested over all operating
conditions to insure stability.
THERMAL PROTECTION
Internal thermal limiting circuitry is provided to protect
the integrated circuit in the event that the maximum junction
temperature is exceeded. When activated, typically at
150
°
C, the output is disabled. There is no hysteresis built
into the thermal protection. As a result the output will appear
to be oscillating during thermal limit. The output will turn
off until the temperature drops below the 150
°
C then the
output turns on again. The process will repeat if the junction
increases above the threshold. This will continue until the
existing conditions allow the junction to operate below the
temperature threshold.
Thermal limit is not a substitute for proper
heatsinking.
The internal current limit will typically limit current to
450 mA. If during current limit the junction exceeds 150
°
C,
the thermal protection will protect the device also.
Current
limit is not a substitute for proper heatsinking.
OUTPUT NOISE
In many applications it is desirable to reduce the noise
present at the output. Reducing the regulator bandwidth by
increasing the size of the output capacitor will reduce the
noise on the MC33275.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MC33275DT-3.0 | 功能描述:低壓差穩壓器 - LDO 3.0V 300mA 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MC33275DT-3.0G | 功能描述:低壓差穩壓器 - LDO 3.0V 300mA 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MC33275DT-3.0RK | 功能描述:低壓差穩壓器 - LDO 3.0V 300mA 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MC33275DT-3.0RKG | 功能描述:低壓差穩壓器 - LDO 3.0V 300mA 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MC33275DT-3.3 | 功能描述:低壓差穩壓器 - LDO 3.3V 300mA 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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