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參數(shù)資料
| 型號(hào)： | LT3150 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Fast Transient Response, Low Input Voltage, Very Low Dropout Linear Regulator Controller |
| 中文描述： | 快速瞬態(tài)響應(yīng)，低輸入電壓，非常低壓差線性穩(wěn)壓器控制器 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 263K |
| 代理商： | LT3150 |
14
LT3150
3150f
APPLICATIOU
Figures 1 and 2 show voltage coefficient and temperature
coefficient comparisons between Y5V and X5R material.
With the critical pole in the LT3150 feedback loop being set
by the absolute value of the output capacitor, it is obvious
why Linear Technology strongly recommends the use of
ceramic capacitors with X5R or X7R dielectric material.
W
U
U
Figure 1. Ceramic Capacitor DC Bias Characteristics
Figure 2. Ceramic Capacitor Temperature Characteristics
DC BIAS VOLTAGE (V)
C
3150 F01
20
0
–20
–40
–60
–80
–1000
4
8
10
2
6
12
14
X5R
Y5V
16
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10
μ
F
TEMPERATURE (
°
C)
–50
40
20
0
–20
–40
–60
–80
–100
25
75
3150 F02
–25
0
50
100
125
Y5V
C
X5R
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10
μ
F
MOSFET Selection
MOSFET selection criteria include threshold voltage
V
GS(TH)
, maximum continuous drain current I
D
, on-resis-
tance R
DS(ON)
, maximum drain-to-source voltage V
DS
and
package thermal resistance R
TH(JA)
.
Linear Technology recommends the use of a logic-level
threshold MOSFET in LT3150 applications. The V
GS
range,
as defined by the threshold voltage and the load current
range, fits well within the boost regulator’s capability and
the output swing range of the error amplifier. The MOSFET’s
continuous drain current rating must equal or exceed the
maximum load current and the maximum drain-to-source
voltage must exceed the maximum input voltage.
The most critical specification is the MOSFET R
DS(ON)
.
Calculate the required R
DS(ON)
from the following formula:
MOSFET R
DS(ON)
≤
V
V
I
IN MIN
(
3
OUT MIN
(
OUT MAX
(
)
)
)
–
The additional factor of three in the equation’s denomina-
tor accounts for production variation, the temperature
coefficient of R
DS(ON)
, voltage dips in V
IN
during transient
output load steps and other operating point characteris-
tics. Although the factor of three is slightly conservative,
this imposes no cost penalty. As an example, consider the
1.8V to 1.5V at 4A application on the front page. Assuming
the 1.8V input and the 1.5V output each have a
±
5%
tolerance,
R
DS(ON)
=
≤
(0 95 1 8
.
)–(0 95 1 5
3 4
.
)
.
A
23 8
V
V
m
A Siliconix Si4410 MOSFET with an R
DS(ON)
of 20m
is a
close match. Although the Si4410’s 30V maximum V
DS
and 8A maximum I
D
ratings exceed the application’s
requirements, the Si4410’s low cost makes it an excellent
choice.
As the final criteria, consider the thermal resistance R
TH(JA)
of the MOSFET’s package. The temperature rise in the
MOSFET must be kept under control and within the
manufacturer’s maximum junction temperature specifica-
tion. The power dissipated in the MOSFET is calculated by:
P
MOSFET
= (V
IN
– V
OUT
) I
OUT
In the design example, P
MOSFET
= (1.8V – 1.5V) 4A =
1.2W. The Si4410’s R
TH(JA)
is 50
°
C/W for its S0-8 pack-
age, which translates to a 60
°
ambient. MOSFET manufacturers have significantly low-
ered the thermal resistance of modern devices with im-
proved packages. These packages provide exposed
backsides that directly transfer heat to the PCB board.
These packages enable LT3150 applications with much
higher output currents while keeping the MOSFET tem-
perature in control.
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| LT3150CGN | 功能描述:IC REG CTRLR SGL POS ADJ 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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| LT3150CGN#TR | 功能描述:IC REG CTRLR SGL POS ADJ 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| LT3150CGN#TRPBF | 功能描述:IC REG CTRLR SGL POS ADJ 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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