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参数资料
型号： TC1313-BC1EMF
厂商： Microchip Technology Inc.
英文描述： 500 mA Synchronous Buck Regulator, + 300 mA LDO
中文描述： 500毫安同步降压稳压器，300 mA的LDO
文件页数： 18/28页
文件大小： 392K
代理商： TC1313-BC1EMF
TC1313
DS21974A-page 18
2005 Microchip Technology Inc.
For 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 137 mW.
5.6.2
LDO OUTPUT (V
OUT2
)
The internal power dissipation within the TC1313 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 TC1313 on a Printed Circuit
Board (PCB). The TC1313 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
TC1313 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-Output 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 TC1313 thermal pad.
FIGURE 5-2:
Fixed-Output 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
OUT2(MIN)
) x I
OUT2(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
= Maximum input voltage
= LDO minimum output
voltage
V
IN(MAX)
V
OUT(MIN)
TC1313
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
TC1313
- Via
相关PDF资料
PDF描述
TC1313-BC1EMFTR 500 mA Synchronous Buck Regulator, + 300 mA LDO
TC1313-BC1EUN 500 mA Synchronous Buck Regulator, + 300 mA LDO
TC1313-BC1EUNTR 500 mA Synchronous Buck Regulator, + 300 mA LDO
TC1313-BC2EMF 500 mA Synchronous Buck Regulator, + 300 mA LDO
TC1313-BC2EMFTR 500 mA Synchronous Buck Regulator, + 300 mA LDO
相关代理商/技术参数
参数描述
TC1313-DG0EMF 功能描述:低压差稳压器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
TC1313-DG0EMFTR 功能描述:低压差稳压器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
TC1313-PP0EMF 功能描述:低压差稳压器 - LDO PWM LDO combo PG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
TC1313-PP0EMFTR 功能描述:低压差稳压器 - LDO PWM LDO combo PG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
TC1313-RD1EMF 功能描述:低压差稳压器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
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