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參數(shù)資料
| 型號： | NCV8675DS33G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 350 mA Very Low Iq Low Dropout Linear Regulator with Reset and Reset Delay |
| 中文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 1.266 V DROPOUT, PSSO5 |
| 封裝： | LEAD FREE, D2PAK-5 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 173K |
| 代理商： | NCV8675DS33G |
NCV8675
http://onsemi.com
10
Figure 34. Application Circuits
100 nF
47 nF
GND
I
G
D
IN
2
5
3
4
1
OUT
RO
NCV8675
C
D
C
IN
C
OUT
22 F
R
EXT
5.0 K
V
OUT
V
RO
V
IN
I
OUT
I
RO
I
D
Circuit Description
The NCV8675 is an integrated low dropout regulator that
provides 5.0 V 350 mA, or 3.3 V 350 mA protected output
and a signal for power on reset. The regulation is provided
by a PNP pass transistor controlled by an error amplifier
with a bandgap reference, which gives it the lowest possible
drop out voltage and best possible temperature stability. The
output current capability is 350 mA, and the base drive
quiescent current is controlled to prevent over saturation
when the input voltage is low or when the output is
overloaded. The regulator is protected by both current limit
and thermal shutdown. Thermal shutdown occurs above
150
°
C to protect the IC during overloads and extreme
ambient temperatures. The delay time for the reset output is
adjustable by selection of the timing capacitor. See
Figure 34, Test Circuit, for circuit element nomenclature
illustration.
Regulator
The error amplifier compares the reference voltage to a
sample of the output voltage (V
OUT
) and drives the base of
a PNP series pass transistor by a buffer. The reference is a
bandgap design to give it a temperature-stable output.
Saturation control of the PNP is a function of the load current
and input voltage. Oversaturation of the output power
device is prevented, and quiescent current in the ground pin
is minimized.
Regulator Stability Considerations
The input capacitor (C
IN
) is necessary to stabilize the
input impedance to avoid voltage line influences. The output
capacitor helps determine three main characteristics of a
linear regulator: startup delay, load transient response and
loop stability. The capacitor value and type should be based
on cost, availability, size and temperature constraints.
Ceramic, tantalum, or electrolytic capacitors of 22 F, or
greater, are stable with very low ESR values. Refer to
Figure 2 for specific ESR ratings. The aluminum
electrolytic capacitor is the least expensive solution, but, if
the circuit operates at low temperatures (-25
°
C to -40
°
C),
both the capacitance and ESR of the capacitor will vary
considerably. The capacitor manufacturer's data sheet
usually provides this information. The value for the output
capacitor C
OUT
shown in Figure 13, Test Circuit, should
work for most applications; however, it is not necessarily the
optimized solution.
Reset Output
The reset output is used as the power on indicator to the
microcontroller. This signal indicates when the output
voltage is suitable for reliable operation of the controller. It
pulls low when the output is not considered to be ready. RO
is pulled up to V
OUT
by an external resistor, typically 5.0 k
in value. The input and output conditions that control the
Reset Output and the relative timing are illustrated in
Figure 35, Reset Timing. Output voltage regulation must be
maintained for the delay time before the reset output signals
a valid condition. The delay for the reset output is defined as
the amount of time it takes the timing capacitor on the delay
pin to charge from a residual voltage of 0 V to the upper
timing threshold voltage V
DU
of 1.3 V. The charging current
for this is I
D
of 4 A. By using typical IC parameters with
a 47 nF capacitor on the D Pin, the following time delay is
derived:
t
RD
C
D
* V
DU
I
D
t
RD
47nF * (1.3V)
4 A
15.3ms
Other time delays can be obtained by changing the C
D
capacitor value. The Delay Time can be reduced by
decreasing the capacitance of C
D
. Using the formula above,
Delay can be reduced as desired. Leaving the Delay Pin
open is not desirable as it can result in unwanted signals
being coupled onto the pin.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV8675DS33R4G | 功能描述:低壓差穩(wěn)壓器 - LDO 350mA 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 |
| NCV8675DS50G | 功能描述:低壓差穩(wěn)壓器 - LDO NCV8675 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(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 |
| NCV8675DS50GEVB | 功能描述:電源管理IC開發(fā)工具 DEMO BRD OPN RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| NCV8675DS50R4G | 功能描述:低壓差穩(wěn)壓器 - LDO NCV8675 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(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 |
| NCV8675DT33RKG | 功能描述:低壓差穩(wěn)壓器 - LDO 3.3V/350MA 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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