- 您现在的位置：买卖IC网 > PDF目录297493 > TC1303B-EF1EMF (Microchip Technology Inc.) 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output PDF资料下载
参数资料
| 型号： | TC1303B-EF1EMF |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| 中文描述： | 500毫安同步降压稳压器，300 mA的LDO具有电源就绪输出 |
| 文件页数： | 13/30页 |
| 文件大小： | 441K |
| 代理商： | TC1303B-EF1EMF |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页当前第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
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 (VOUT2)
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 AGND (analog ground) and PGND (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 (CIN1). 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 (COUT1)
and inductor (L1). All three of these components are
placed near their respective pins to minimize trace
length. The CIN1 and COUT1 capacitor returns are con-
nected closely together at the PGND plane. The LDO
optional input capacitor (CIN2) and LDO output capaci-
tor COUT2 are returned to the AGND plane. The analog
ground plane and power ground plane are connected
at one point (shown near L1). All other signals (SHDN1,
SHDN2, feedback in the adjustable output case)
should be referenced to AGND and have the AGND
plane underneath them.
FIGURE 5-1:
Component Placement,
Fixed 10-Pin MSOP.
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 VIN1 to VIN2 connection is routed on the bottom of
the board around the TC1303B thermal pad.
FIGURE 5-2:
Component Placement,
Fixed 10-Pin DFN.
Input Voltage
VIN =5V±10%
LDO Output Voltage and Current
VOUT =3.3V
IOUT =300 mA
Internal Power Dissipation
PLDO(MAX) =(VIN(MAX) – VOUT(MIN)) x IOUT(MAX)
PLDO = (5.5V) – (0.975 x 3.3V))
x 300 mA
PLDO =684.8 mW
P
LDO
V
IN MAX
)
() VOUT2 MIN
()
–
() I
OUT2 MAX
)
()
×
=
Where:
PLDO
= LDO Pass device internal
power dissipation
VIN(MAX) = Maximum input voltage
VOUT(MIN)= LDO minimum output voltage
TC1303B
1
2
6
8
7
9
10
5
4
3
+VOUT1
PGND
+VIN1
AGND
+VOUT2
COUT1
CIN2
COUT2
CIN1
PGND Plane
AGND Plane
L1
AGND to PGND
+VIN2
* CIN2 Optional
- Via
1
2
6
8
7
9
10
5
4
3
+VOUT1
PGND
+VIN1
AGND
+VOUT2
COUT1
CIN2
COUT2
CIN1
PGND Plane
AGND Plane
L1
AGND to PGND
PGND
* CIN2 Optional
+VIN2
TC1303B
- Via
相关PDF资料 |
PDF描述 |
|---|---|
| TC1303B-EF1EUNTR | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-EF1EUN | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC2178APFREQ | TCXO, SINE OUTPUT, 5 MHz - 155 MHz |
| TC2178AQFREQ | TCXO, CLIPPED SINE OUTPUT, 5 MHz - 155 MHz |
| TC2178ALFREQ | TCXO, SINE OUTPUT, 5 MHz - 155 MHz |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1303B-IA0EMF | 功能描述:低压差稳压器 - LDO PWM/LDO combo w/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 |
| TC1303B-IA0EMFTR | 功能描述:低压差稳压器 - LDO PWM/LDO combo w/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 |
| TC1303B-IA0EUN | 功能描述:低压差稳压器 - LDO PWM/LDO combo w/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 |
| TC1303B-IA0EUNTR | 功能描述:低压差稳压器 - LDO PWM/LDO combo w/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 |
| TC1303B-PA0EMF | 功能描述:低压差稳压器 - LDO PWM/LDO combo w/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 |
发布紧急采购，3分钟左右您将得到回复。