- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385775 > RT9185BGL5 (Richtek Technology Corporation) Triple, Ultra-Fast CMOS LDO Regulator PDF資料下載
參數(shù)資料
| 型號(hào)： | RT9185BGL5 |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Triple, Ultra-Fast CMOS LDO Regulator |
| 中文描述： | 三，超高速的CMOS LDO穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大?。?/td> | 195K |
| 代理商： | RT9185BGL5 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)當(dāng)前第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)
RT9185
9
DS9185-11 March 2007
www.richtek.com
Equally important to consider is a capacitor's ESR change
with temperature: this is not an issue with ceramics, as
their ESR is extremely low. However, it is very important in
tantalum and aluminum electrolytic capacitors. Both show
increasing ESR at colder temperatures, but the increase
in aluminum electrolytic capacitors is so severe they may
not be feasible for some applications.
Ceramic :
For values of capacitance in the 10
μ
F to 100
μ
F range,
ceramics are usually larger and more costly than tantalums
but give superior AC performance for by-passing high
frequency noise because of very low ESR (typically less
than 10m
Ω
). However, some dielectric types do not have
good capacitance characteristics as a function of voltage
and temperature.
Z5U and Y5V dielectric ceramics have capacitance that
drops severely with applied voltage. A typical Z5U or Y5V
capacitor can lose 60% of its rated capacitance with half of
the rated voltage applied to it. The Z5U and Y5V also exhibit
a severe temperature effect, losing more than 50% of
nominal capacitance at high and low limits of the
temperature range.
X7R and X5R dielectric ceramic capacitors are strongly
recommended if ceramics are used, as they typically
maintain a capacitance range within
±
20% of nominal over
full operating ratings of temperature and voltage. Of course,
they are typically larger and more costly than Z5U/Y5U
types for a given voltage and capacitance.
Tantalum :
Solid tantalum capacitors are recommended for use on
the output because their typical ESR is very close to the
ideal value required for loop compensation. They also work
well as input capacitors if selected to meet the ESR
requirements previously listed.
Tantalums also have good temperature stability: a good
quality tantalum will typically show a capacitance value
that varies less than 10~15% across the full temperature
range of 125
°
C to -40
°
C. ESR will vary only about 2X going
from the high to low temperature limits.
The increasing ESR at lower temperatures can cause
oscillations when marginal quality capacitors are used (if
the ESR of the capacitor is near the upper limit of the
stability range at room temperature).
Aluminum :
This capacitor type offers the most capacitance for the
money. The disadvantages are that they are larger in
physical size, not widely available in surface mount, and
have poor AC performance (especially at higher
frequencies) due to higher ESR and ESL.
Compared by size, the ESR of an aluminum electrolytic is
higher than either Tantalum or ceramic, and it also varies
greatly with temperature. A typical aluminum electrolytic
can exhibit an ESR increase of as much as 50X when going
from 25
°
C down to -40
°
C.
It should also be noted that many aluminum electrolytics
only specify impedance at a frequency of 120Hz, which
indicates they have poor high frequency performance. Only
aluminum electrolytics that have an impedance specified
at a higher frequency (between 20kHz and 100kHz) should
be used for the device. Derating must be applied to the
manufacturer's ESR specification, since it is typically only
valid at room temperature.
Any applications using aluminum electrolytics should be
thoroughly tested at the lowest ambient operating
temperature where ESR is maximum.
Thermal Considerations
The RT9185 is a triple channel CMOS regulator designed
to provide two output voltage from one package. Each
output pin the RT9185 can deliver a current of up to 1.5A,
0.8A and 0.3A respectively over the full operating junction
temperature range. However, the maximum output current
must be derated at higher ambient temperature to ensure
the junction temperature does not exceed 125
°
C. With all
possible conditions, the junction temperature must be within
the range specified under operating conditions. Each
regulator contributes power dissipation to the overall power
dissipation of the package. Power dissipation can be
calculated based on the output current and the voltage
drop across each regulator.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| RT9185BGM5 | Triple, Ultra-Fast CMOS LDO Regulator |
| RT9185BGS | Triple, Ultra-Fast CMOS LDO Regulator |
| RT9185BPL5 | Triple, Ultra-Fast CMOS LDO Regulator |
| RT9185BPM5 | Triple, Ultra-Fast CMOS LDO Regulator |
| RT9185BPS | Triple, Ultra-Fast CMOS LDO Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RT9186AGF | 功能描述:IC REG LDO ADJ .5A 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:50 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.3V 輸入電壓:最高 15V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 800mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:800mA 電流 - 限制（最?。?800mA 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-4，D²Pak（3 引線+接片），TO-263AA 供應(yīng)商設(shè)備封裝:D2PAK-3 包裝:管件 |
| RT9186AGQV | 功能描述:IC REG LDO ADJ .5A 8VDFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.1V 輸入電壓:最高 7.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:5A（最小值） 電流 - 限制（最?。?5.1A 工作溫度:-40°C ~ 100°C 安裝類型:通孔 封裝/外殼:TO-220-5 供應(yīng)商設(shè)備封裝:TO-220-5 包裝:管件 配用:296-20624-ND - EVAL MOD FOR TPS72518 其它名稱:296-15154-5 |
| RT9187CGB | 制造商:Richtek Technology Corporation 功能描述:600mA, Ultra-Low Dropout, Ultra-Fast CMOS LDO Regulator |
| RT9187G | 功能描述:IC REG LDO ADJ 1A SOT-23 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:MIC5365/66 Ultra-small LDO Regulators 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3V 輸入電壓:最高 5.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.155V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最小）:200mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:4-UDFN 裸露焊盤，4-TMLF? 供應(yīng)商設(shè)備封裝:4-TMLF?（1x1） 包裝:Digi-Reel® 其它名稱:576-3192-6 |
| RT9187GQV | 功能描述:IC REG LDO ADJ 1A 8VDFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:MIC5365/66 Ultra-small LDO Regulators 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3V 輸入電壓:最高 5.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.155V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?200mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:4-UDFN 裸露焊盤，4-TMLF? 供應(yīng)商設(shè)備封裝:4-TMLF?（1x1） 包裝:Digi-Reel® 其它名稱:576-3192-6 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。