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參數(shù)資料
| 型號： | Si9181 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Micropower 350-mA CMOS LDO Regulator With Error Flag/Power-On-Reset(350mA微功耗CMOS低壓差穩(wěn)壓器（帶電源錯誤標記和加電復(fù)位）) |
| 中文描述： | 微350毫安的CMOS LDO穩(wěn)壓器在錯誤旗/上電復(fù)位（350mA的微功耗的CMOS低壓差穩(wěn)壓器（帶電源錯誤標記和加電復(fù)位）） |
| 文件頁數(shù)： | 10/10頁 |
| 文件大?。?/td> | 130K |
| 代理商： | SI9181 |
Si9181
Vishay Siliconix
New Product
www.vishay.com FaxBack 408-970-5600
10
Document Number: 71119
S-01484—Rev. B, 03-Jul-00
The Si9181 is a low drop out, low quiescent current, and very
linear regulator family with very fast transient response. It is
primarily designed for battery powered applications where
battery run time is at a premium. The low quiescent current
allows extended standby time while low drop out voltage
enables the system to fully utilize battery power before
recharge. The Si9181 is a very fast regulator with bandwidth
exceeding 50 kHz while maintaining low quiescent current at
light load conditions. With this bandwidth, the Si9181 is the
fastest LDO available today. The Si9181 is stable with any
output capacitor type from 1 F to 10.0 F. However, X5R or
X7R ceramic capacitors are recommended for best output
noise and transient performance.
V
IN
V
IN
is the input supply pin. The bypass capacitor for this pin
is not critical as long as the input supply has low enough source
impedance. For practical circuits, a 1.0- F or larger ceramic
capacitor is recommended. When the source impedance is
not low enough and/or the source is several inches from the
Si9181, then a larger input bypass capacitor is needed. It is
required that the equivalent impedance (source impedance,
wire, and trace impedance in parallel with input bypass
capacitor impedance) must be smaller than the input
impedance of the Si9181 for stable operation. When the
source impedance, wire, and trace impedance are unknown,
it is recommended that an input bypass capacitor be used of
a value that is equal to or greater than the output capacitor.
V
OUT
V
OUT
is the output voltage of the regulator. Connect a bypass
capacitor from V
OUT
to ground. The output capacitor can be
any value from 1.0 F to 10.0 F. A ceramic capacitor with
X5R or X7R dielectric type is recommended for best output
noise, line transient, and load transient performance.
GND
Ground is the common ground connection for V
IN
and V
OUT
.
It is also the local ground connection for C
NOISE
, DELAY,
SENSE or ADJ, and SD.
SENSE or ADJ
SENSE is used to sense the output voltage. Connect SENSE
to V
OUT
for the fixed voltage version. For the adjustable output
version, use a resistor divider R1 and R2, connect R1 from
V
OUT
to ADJ and R2 from ADJ to ground. R2 should be in the
25-k to 150-k range for low power consumption, while
maintaining adequate noise immunity.
The formula below calculates the value of R1, given the
desired output voltage and the R2 value,
(1)
R1
V
OUT
V
ADJ
R2
V
ADJ
V
ADJ
is nominally 1.215 V.
SHUTDOWN (SD)
SD controls the turning on and off of the Si9181. V
OUT
is
guaranteed to be on when the SD pin voltage equals or is
greater than 1.5 V. V
OUT
is guaranteed to be off when theSD
pin voltage equals or is less than 0.4 V. During shutdown
mode, the Si9181 will draw less than 2- A current from the
source. To automatically turn on V
OUT
whenever the input is
applied, tie the SD pin to V
IN
.
ERROR
ERROR is an open drain output that goes low when V
OUT
is
less than 5% of its normal value. As with any open drain output,
an external pull up resistor is needed. When a capacitor is
connected from DELAY to GROUND, the error signal transition
from low to high is delayed (see Delay section). This delayed
error signal can be used as the power-on reset signal for the
application system. (Refer to Figure 4.)
The ERROR pin is disconnected if not used.
DELAY
A capacitor from DELAY to GROUND sets the time delay for
ERROR going from low to high state. The time delay can be
calculated using the following formula:
(2)
T
delay
V
ADJ
C
delay
I
delay
The DELAY pin should be an open circuit if not used.
C
NOISE
For low noise application, connect a high frequency ceramic
capacitor from C
NOISE
to ground. A 0.01- F or a 0.1- F X5R
or X7R is recommended.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| Si91821DH-AD-T1 | Micropower 300-mA CMOS LDO Regulator With Error Flag |
| Si91821DH-AD-T1-E3 | Micropower 300-mA CMOS LDO Regulator With Error Flag |
| Si91821DH-18-T1 | Micropower 300-mA CMOS LDO Regulator With Error Flag |
| Si91821DH-18-T1-E3 | Micropower 300-mA CMOS LDO Regulator With Error Flag |
| Si91821DH-25-T1 | Micropower 300-mA CMOS LDO Regulator With Error Flag |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI9181_05 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:Micropower 350-mA CMOS LDO Regulator With Error Flag/Power-On-Reset |
| SI9181DB | 功能描述:電源管理IC開發(fā)工具 SI9181 Demo Board 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 |
| SI9181DQ-15-T1 | 功能描述:低壓差穩(wěn)壓器 - LDO 350mA 1.5V 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(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 |
| SI9181DQ-15-T1-3 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:Micropower 350-mA CMOS LDO Regulator With Error Flag/Power-On-Reset |
| SI9181DQ-15-T1-E3 | 功能描述:低壓差穩(wěn)壓器 - LDO 350mA 1.5V 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(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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