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參數(shù)資料
| 型號(hào)： | SC1454XIMSTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual 150mA Ultra Low Dropout, Low Noise Regulator |
| 中文描述： | 雙150mA的超低壓差，低噪聲穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 7/14頁(yè) |
| 文件大?。?/td> | 261K |
| 代理商： | SC1454XIMSTRT |
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7
2005 Semtech Corp.
www.semtech.com
SC1454
POWER MANAGEMENT
Applications Information (Cont.)
impedance allowable to maintain T
J
≤
125°C:
(
P
)
MAX
(
D
=
This target value can be achieved by using one square
inch of board copper connected to the GND pin (pin 3),
which connects directly to the device substrate.
Increasing this area or the use of multi layer boards will
lower the junction temperature and improve overall
output voltage accuracy.
Layout Considerations
While layout for linear devices is generally not as critical
as for a switching application, careful attention to detail
will ensure reliable operation.
1) Attaching the part to a larger copper footprint will
enable better heat transfer from the device, especially
on PCBs where there are internal ground and power
planes.
2) Place the input, output and bypass capacitors close
to the device for optimal transient response and device
behaviour.
3) Connect all ground connections directly to the ground
plane. If there is no ground plane, connect to a common
local ground point before connecting to board ground.
R1 and R2 should be selected such that the current
flowing through them is
≥
10μA (thus R2
≤
120k
).
Thermal Considerations
The worst-case power dissipation for this part is given
by:
(
I
V
+
(1)
For all practical purposes, equation (1) can be reduced
to the following expression:
(
)
)
MIN
(
OUTB
)
MAX
(
IN
V
V
+
(2)
Looking at a typical application:
V
IN(MAX)
= 4.2V
V
OUTA
V
OUTB
= 3.3V - 2% (worst case) = 3.234V
I
OUTA
= I
OUTB
= 150mA
T
Inserting these values into equation (2) above gives us:
Using this figure, we can calculate the maximum thermal
)
)
MAX
(
Q
)
MAX
(
IN
I
V
V
P
=
)
MAX
(
OUTB
I
(
2
)
(
2
)
W
334
.
145
.
189
.
15
.
234
.
15
.
94
.
+
P
)
MAX
(
D
=
=
+
=
)
(
)
W
/
C
120
334
°
.
85
125
T
T
)
MAX
(
A
)
MAX
(
)
MAX
(
JA
=
=
θ
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC1454 | Dual 150mA Ultra Low Dropout, Low Noise Regulator |
| SC1454XIMSTR | Dual 150mA Ultra Low Dropout, Low Noise Regulator |
| SC1456XIMSTRT | Dual 150mA Ultra Low Dropout, Low Noise Regulator |
| SC1456 | Dual 150mA ULTRA LOW DROPOUT, LOW NOISE REGULATOR |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1456 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual 150mA ULTRA LOW DROPOUT, LOW NOISE REGULATOR |
| SC1456_05 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual 150mA Ultra Low Dropout, Low Noise Regulator |
| SC1456XIMSTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual 150mA Ultra Low Dropout, Low Noise Regulator |
| SC1456XIMSTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual 150mA Ultra Low Dropout, Low Noise Regulator |
| SC1457 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:150mA Ultra Low Dropout Regulator with Undervoltage Flag |
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