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參數(shù)資料
| 型號(hào)： | LTC1844ES5-3.3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 150mA, Micropower, Low Noise, VLDO Linear Regulator |
| 中文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.15 V DROPOUT, PDSO5 |
| 封裝： | PLASTIC, MO-193, THIN, SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 209K |
| 代理商： | LTC1844ES5-3.3 |
7
LTC1844 Series
1844ia
APPLICATIOU
output current change of 1mA to 100mA is –4mV typical
at V
OUT
= 1.25V. At V
OUT
= 5V, load regulation is:
(5V/1.25V)(–4mV) = –16mV
Because the ADJ pin is relatively high impedance (depend-
ing on the resistor divider used), stray capacitance at this
pin can introduce significant phase shift in the error
amplifier loop. The PCB layout should be designed to
absolutely minimize the capacitance seen at the ADJ pin.
To ensure stability over all operating conditions when
utilizing large divider resistors, it may be necessary to use
a small ceramic feedforward capacitor (~1000pF) in par-
allel with the upper divider resistor (see C
FF
in Figure 2). As
an added bonus, this capacitor will improve transient
response.
W
U
U
Bypass Capacitance and Low Noise Performance
A bypass capacitor can optionally be connected from the
BYP pin to ground to lower output voltage noise. A good
quality low leakage capacitor is recommended. This ca-
pacitor will bypass the input of the error amplifier, provid-
ing a low frequency noise pole. The noise pole provided by
this bypass capacitor will lower the output voltage noise to
as low as 30
μ
V
RMS
with the addition of a 0.1
μ
F capacitor.
Initial regulator power-up time is inversely proportional to
the size of the bypass capacitor, slowing to 10ms with a
0.1
μ
F capacitor and 10
μ
F output capacitor. However, the
LTC1844 does not discharge the bypass capacitor when
put into shutdown and thus the shutdown exit delay can be
much shorter (
≈
70
μ
s) than initial power-up time if the
shutdown duration is brief (<10ms). The maximum shut-
down duration required to allow fast shutdown exit is
determined by the capacitor leakage current, thus a low
leakage bypass capacitor is recommended.
Output Capacitance and Transient Response
The LTC1844 regulators are designed to be stable with a
wide range of output capacitors. The ESR of the output
capacitor affects stability, most notably with small capaci-
tors. A minimum output capacitor of 1
μ
F with an ESR of
0.3
or less is recommended to ensure stability. The
LTC1844 is a micropower device and output transient
response will be a function of output capacitance. Larger
values of output capacitance decrease the peak deviations
and provide improved transient response for larger load
current changes. Note that bypass capacitors used to
decouple individual components powered by the LTC1844
will increase the effective output capacitor value. The
shaded region of Figure 3 defines the region over which
the LTC1844 regulators are stable. The maximum ESR
allowed is 0.3
. High ESR tantalum and electrolytic ca-
pacitors may be used, but a low ESR ceramic capacitor
must be in parallel at the output. There is no minimum ESR
requirement.
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
Figure 3. Stability
OUTPUT CAPACITANCE (
μ
F)
0.33
1
3.3
10
33
E
)
0.20
0.25
STABLE REGION
0.30
100
1844 F03
0.15
0.10
0
0.05
0.40
0.35
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1844ES5-BYP#TR | 功能描述:IC REG LDO ADJ .15A TSOT23-5 RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 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:3.3V 輸入電壓:2.5 V ~ 5.5 V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.1V @ 200mA 穩(wěn)壓器數(shù)量:2 電流 - 輸出:300mA 電流 - 限制（最?。?350mA 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-UFQFN 供應(yīng)商設(shè)備封裝:8-MLPQ-UT（1.5x1.5） 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:1358 (CN2011-ZH PDF) 其它名稱(chēng):SC560HULCT |
| LTC1844ES5-BYP#TRM | 功能描述:IC REG LDO ADJ .15A TSOT23-5 RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 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:3.3V 輸入電壓:2.5 V ~ 5.5 V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.1V @ 200mA 穩(wěn)壓器數(shù)量:2 電流 - 輸出:300mA 電流 - 限制（最小）:350mA 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-UFQFN 供應(yīng)商設(shè)備封裝:8-MLPQ-UT（1.5x1.5） 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:1358 (CN2011-ZH PDF) 其它名稱(chēng):SC560HULCT |
| LTC1844ES5-BYP#TRMPBF | 功能描述:IC REG LDO ADJ .15A TSOT23-5 RoHS:是 類(lèi)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(lèi)型:表面貼裝 封裝/外殼:4-UDFN 裸露焊盤(pán)，4-TMLF? 供應(yīng)商設(shè)備封裝:4-TMLF?（1x1） 包裝:Digi-Reel® 其它名稱(chēng):576-3192-6 |
| LTC1844ES5-BYP#TRPBF | 功能描述:IC REG LDO ADJ .15A TSOT23-5 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 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:3.3V 輸入電壓:2.5 V ~ 5.5 V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.1V @ 200mA 穩(wěn)壓器數(shù)量:2 電流 - 輸出:300mA 電流 - 限制（最?。?350mA 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-UFQFN 供應(yīng)商設(shè)備封裝:8-MLPQ-UT（1.5x1.5） 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:1358 (CN2011-ZH PDF) 其它名稱(chēng):SC560HULCT |
| LTC1844ES5-BYPTRMPBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 1.25-6V 0.15A TSOT23-5 |
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