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參數(shù)資料
| 型號： | ADP3330ART-33 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護(hù) |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 137K |
| 代理商： | ADP3330ART-33 |
ADP3330
–9–
REV. A
Printed Circuit Board Layout Considerations
All surface mount packages rely on the traces of the PC board
to conduct heat away from the package.
In standard packages the dominant component of the heat
resistance path is the plastic between the die attach pad and the
individual leads. In typical thermally enhanced packages one or
more of the leads are fused to the die attach pad, significantly
decreasing this component. To make the improvement mean-
ingful, however, a significant copper area on the PCB must be
attached to these fused pins.
The patented chip-on-lead frame design of the ADP3330
uniformly minimizes the value of the dominant portion of the
thermal resistance. It ensures that heat is conducted away by all
pins of the package. This yields a very low 165
°
C/W thermal
resistance for an SOT-23-6 package, without any special board
layout requirements, just relying on the normal traces con-
nected to the leads. This yields a 17% improvement in heat
dissipation capability as compared to a standard SOT-23-6
package. The thermal resistance can be decreased by, approxi-
mately, an additional 10% by attaching a few square cm of
copper area to the V
IN
pin of the ADP3303 package.
It is not recommended to use solder mask or silkscreen on the
PCB traces adjacent to the ADP3330’s pins since it will increase
the junction to ambient thermal resistance of the package.
Error Flag Dropout Detector
The ADP3330 will maintain its output voltage over a wide
range of load, input voltage and temperature conditions. If the
output is about to lose regulation by reducing the supply voltage
below the combined regulated output and dropout voltages,
the
ERR
flag will be activated. The
ERR
output is an open
collector, which will be driven low.
Once set, the
ERR
flag’s hysteresis will keep the output low
until a small margin of operating range is restored either by
raising the supply voltage or reducing the load.
Shutdown Mode
Applying a TTL high signal to the shutdown (
SD
) pin, or tying
it to the input pin, will turn the output ON. Pulling
SD
down to
0.4 V or below, or tying it to ground, will turn the output OFF.
In shutdown mode, quiescent current is reduced to much less
than 1
μ
A.
Low Power, Low Dropout Applications
ADP3330 is well suited for applications such as cellular phone
handsets that require low quiescent current and low dropout
voltage features. ADP3330 draws 34
μ
A typical under light load
situations (i.e., load current = 100
μ
A), which results in low
power consumption when the cell phone is in standby mode.
Figure 23 shows an application in which the ADP3330 is used
in a handset to provide 2.75 V nominal output voltage. The cell
phone is powered from 3 cell NiCd or 1 cell Li-Ion battery.
ADP3330 guarantees an accuracy of 1.4%, even when the input/
output differential is merely 250 mV (worst case). This implies
that the output is regulated and within specification even when
the battery voltage has reached its end-of-discharge voltage of
3 V. The output voltage never falls below 2.7 V, even under
worst case load and temperature conditions. The low dropout
feature coupled with the high accuracy of the ADP3330 ensures
that the system is reliably powered until the end of the life of the
battery, which results in increased system talk time.
MINIMUM BATTERY
VOLTAGE 3.0V
NOMINAL OUTPUT
VOLTAGE 2.75V
2.712V
ABSOLUTE MINIMUM
OUTPUT VOLTAGE
2.700V
END OF DISCHARGE VOLTAGE
OF 3 CELL NiCd OR 1 CELL
Li-Ion BATTERY
250mV MAXIMUM INPUT-OUTPUT
OVERHEAD FOR 200mA OUTPUT
CURRENT
–1.4% OUTPUT
VOLTAGE ACCURACY
12mV TRANSIENT, LINE AND
LOAD RESPECTIVE MARGIN
Figure 23.LDO Budgeting for a 3 Cell NiCd/1 Cell
Li-Ion Supply
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| ADP3330ART-36 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
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| ADP3333ARM-15 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3330ART-33-RL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Accuracy Ultralow IQ, 200 mA, SOT-23, anyCAP Low Dropout Regulator |
| ADP3330ART-36 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Accuracy Ultralow IQ, 200 mA, SOT-23, anyCAP⑩ Low Dropout Regulator |
| ADP3330ART-3-REEL | 制造商:Analog Devices 功能描述: |
| ADP3330ART-3-REEL7 | 制造商:Analog Devices 功能描述:LDO REG 3V 0.3A 6PIN SOT-23 - Tape and Reel 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:IC VOLTAGE REGULATOR |
| ADP3330ART-5 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Accuracy Ultralow IQ, 200 mA, SOT-23, anyCAP⑩ Low Dropout Regulator |
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