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參數(shù)資料
| 型號(hào)： | TC1303B-FJ3EUNTR |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| 中文描述： | 500毫安同步降壓穩(wěn)壓器，300 mA的LDO具有電源就緒輸出 |
| 文件頁數(shù)： | 20/30頁 |
| 文件大?。?/td> | 441K |
| 代理商： | TC1303B-FJ3EUNTR |
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TC1303B
DS21949A-page 20
2005 Microchip Technology Inc.
As an example, for a 3.6V input, 1.8V output with a load
of 400 mA, the efficiency taken from Figure 2-7 is
approximately 84%. The internal power dissipation is
approximately 171 mW.
5.6.2
LDO OUTPUT (V
OUT2
)
The internal power dissipation within the TC1303B
LDO is a function of input voltage, output voltage and
output current. The following equation can be used to
calculate the internal power dissipation for the LDO.
EQUATION 5-7:
The maximum power dissipation capability for a
package can be calculated given the junction-to-
ambient thermal resistance and the maximum ambient
temperature for the application. The following equation
can be used to determine the package’s maximum
internal power dissipation.
5.6.3
LDO POWER DISSIPATION
EXAMPLE
5.7
PCB Layout Information
Some basic design guidelines should be used when
physically placing the TC1303B on a Printed Circuit
Board (PCB). The TC1303B has two ground pins, iden-
tified as A
GND
(analog ground) and P
GND
(power
ground). By separating grounds, it is possible to
minimize the switching frequency noise on the LDO
output. The first priority, while placing external compo-
nents on the board, is the input capacitor (C
IN1
). Wiring
should be short and wide; the input current for the
TC1303B can be as high as 800 mA. The next priority
would be the buck regulator output capacitor (C
OUT1
)
and inductor (L
1
). All three of these components are
placed near their respective pins to minimize trace
length. The C
IN1
and C
OUT1
capacitor returns are con-
nected closely together at the P
GND
plane. The LDO
optional input capacitor (C
IN2
) and LDO output capaci-
tor C
OUT2
are returned to the A
GND
plane. The analog
ground plane and power ground plane are connected
at one point (shown near L
1
). All other signals (SHDN1,
SHDN2, feedback in the adjustable output case)
should be referenced to A
GND
and have the A
GND
plane underneath them.
FIGURE 5-1:
Fixed 10-Pin MSOP.
Component Placement,
There will be some difference in layout for the 10-pin
DFN package due to the thermal pad. A typical fixed-
output DFN layout is shown below. For the DFN layout,
the V
IN1
to V
IN2
connection is routed on the bottom of
the board around the TC1303B thermal pad.
FIGURE 5-2:
Fixed 10-Pin DFN.
Component Placement,
Input Voltage
V
IN
= 5V±10%
LDO Output Voltage and Current
V
OUT
= 3.3V
I
OUT
= 300 mA
Internal Power Dissipation
P
LDO(MAX)
= (V
IN(MAX)
– V
OUT(MIN)
) x I
OUT(MAX)
P
LDO
= (5.5V) – (0.975 x 3.3V))
x 300 mA
P
LDO
= 684.8 mW
P
LDO
V
IN MAX
)
)
V
OUT2 MIN
)
–
(
)
I
OUT2 MAX
)
)
×
=
Where:
P
LDO
= LDO Pass device internal
power dissipation
V
IN(MAX)
= Maximum input voltage
V
OUT(MIN)
= LDO minimum output voltage
TC1303B
1
2
3
6
8
7
9
10
5
4
+V
OUT1
P
GND
+V
IN1
A
GND
A
GND
+V
OUT2
C
OUT1
C
IN2
C
OUT2
C
IN1
P
GND
Plane
A
GND
Plane
L
1
A
GND
to P
GND
+V
IN2
* C
IN2
Optional
- Via
1
2
3
6
8
7
9
10
5
4
+V
OUT1
P
GND
+V
IN1
A
GND
A
GND
+V
OUT2
C
OUT1
C
IN2
C
OUT2
C
IN1
P
GND
Plane
A
GND
Plane
L
1
A
GND
to P
GND
PGND
*
C
IN2
Optional
+V
IN2
TC1303B
- Via
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1303B-IA0EMF | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1303B-IA0EMFTR | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1303B-IA0EUN | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1303B-IA0EUNTR | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1303B-PA0EMF | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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