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參數(shù)資料
| 型號： | LTC3026EMSE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1.5A Low Input Voltage VLDO Linear Regulator |
| 中文描述： | 0.4 V-2.6 V ADJUSTABLE POSITIVE LDO REGULATOR, 0.25 V DROPOUT, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 201K |
| 代理商： | LTC3026EMSE |
LTC3026
11
3026f
OPERATIOU
Boost Converter Component Selection
A 10
μ
H chip inductor with a peak saturation current (I
SAT
)
of at least 150mA is recommended for use with the internal
boost converter. The inductor value can range between
4.7
μ
H to 40
μ
H, but values less than 10
μ
H result in higher
switching frequency, increased switching losses, and
lower max output current available at the BST pin. See
Table 1 for a list of component suppliers.
It is also recommended that the BST pin be bypassed to
ground with a 4.7
μ
F or greater ceramic capacitor. Larger
values of capacitance will not reduce the size of the BST
ripple much, but will decrease the ripple frequency pro-
portionally. The BST pin should maintain 1
μ
F of capaci-
tance at all times to ensure correct operation (See “Output
Capacitance and Transient Response” section about ca-
pacitor selection). High ESR tantalum and electrolytic
capacitors may be used, but a low ESR ceramic must be
used in parallel for correct operation.
Thermal Considerations
The power handling capability of the device will be limited
by the maximum rated junction temperature (125
°
C). The
majority of the power dissipated in the device will be the
output current multiplied by the input/output voltage
differential: (I
OUT
)(V
IN
– V
OUT
). Note that the BST current
is less than 200
μ
A even under heavy loads, so its power
consumption can be ignored for thermal calculations.
The LTC3026 has internal thermal limiting designed to
protect the device during momentary overload conditions.
For continuous normal conditions, the maximum junction
temperature rating of 125
°
C must not be exceeded. It is
SUPPLIER
Coilcraft
Murata
Taiyo Yuden
TDK
PART NUMBER
0603PS-103KB
LQH2MCN100K02
LB2016T100M
NLC252018T-100K
WEBSITE
www.coilcraft.com
www.murata.com
www.t-yuden.com
www.TDK.com
Table 1. Inductor Vendor Information
important to give careful consideration to all sources of
thermal resistance from junction to ambient. Additional
heat sources mounted nearby must also be considered.
For surface mount devices, heat sinking is accomplished
by using the heat-spreading capabilities of the PC board
and its copper traces. Copper board stiffeners and plated
through holes can also be used to spread the heat gener-
ated by power devices.
A junction-to-ambient thermal coefficient of 40
°
C/W is
achieved by connecting the exposed pad of the MSOP or
DFN package directly to a ground plane of about 2500mm
2
.
Calculating Junction Temperature
Example: Given an output voltage of 1.2V, an input voltage
of 1.8V
±
4%, an output current range of 0mA to 1A and a
maximum ambient temperature of 50
°
C, what will the
maximum junction temperature be
The power dissipated by the device will be approximately:
I
OUT(MAX)
(V
IN(MAX)
– V
OUT
)
where:
I
OUT(MAX)
= 1A
V
IN(MAX)
= 1.87V
so:
P = 1A(1.87V – 1.2V) = 0.67W
Even under worst-case conditions LTC3026’s BST pin
power dissipation is only about 1mW, thus can be ig-
nored. The junction to ambient thermal resistance will be
on the order of 40
°
C/W. The junction temperature rise
above ambient will be approximately equal to:
0.67W(40
°
C/W) = 26.8
°
C
The maximum junction temperature will then be equal to
the maximum junction temperature rise above ambient
plus the maximum ambient temperature or:
T
A
= 26.8
°
C + 50
°
C = 76.8
°
C
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3026EMSE#PBF | 功能描述:IC REG LDO ADJ 1.5A 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:1 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:8V 輸入電壓:10.5 V ~ 23 V 電壓 - 壓降（標準）:1.7V @ 40mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:100mA（最小值） 電流 - 限制（最?。?- 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:1075 (CN2011-ZH PDF) 其它名稱:296-24390-1 |
| LTC3026EMSE#PBF | 制造商:Linear Technology 功能描述:Linear Voltage Regulator IC |
| LTC3026EMSE#TR | 制造商:Linear Technology 功能描述:LDO Regulator Pos 0.4V to 2.6V 1.5A 10-Pin MSOP EP T/R |
| LTC3026EMSE#TRPBF | 功能描述:IC REG LDO ADJ 1.5A 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:800 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:2.5V 輸入電壓:最高 16V 電壓 - 壓降（標準）:0.7V @ 4A 穩(wěn)壓器數(shù)量:1 電流 - 輸出:4A 電流 - 限制（最?。?4.2A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-6，D²Pak（5 引線+接片），TO-263BA 供應(yīng)商設(shè)備封裝:TO-263-5 包裝:帶卷 (TR) 其它名稱:AP1184K525L-13AP1184K525LDITR |
| LTC3026EMSE-1#PBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 0.4V to 2.6V 1.5A 10-Pin MSOP EP 制造商:Linear Technology 功能描述:IC REG LDO ADJ 1.5A 10MSOP |
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