- 您现在的位置：买卖IC网 > PDF目录225341 > TPS726126 (Texas Instruments, Inc.) "Single Output LDO PDF资料下载
参数资料
| 型号： | TPS726126 |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | "Single Output LDO |
| 中文描述： | 单输出 LDO、1.0A、固定电压 (1.26V)、任意电容、低输入电压、集成 SVS |
| 文件页数： | 15/16页 |
| 文件大小： | 445K |
| 代理商： | TPS726126 |
www.ti.com
A
B
C
TJ
A
RθJC
TC
B
RθCS
TA
C
RθSA
(a)
(b)
DDPAK Package
SOT223 Package
CIRCUIT BOARD COPPER AREA
B
A
C
T
J +
T
A )
P
Dmax x R
θJC ) RθCS ) RθSA
(2)
T
J +
T
A )
P
Dmax x R
θJA
(3)
RθJA +
T
J–TA
P
Dmax
(4)
TPS726126
TPS72615, TPS72616
TPS72618, TPS72625
SLVS403F – MAY 2002 – REVISED MAY 2005
THERMAL INFORMATION (continued)
ambient temperature (TA) and the increase in temperature due to the regulator's power dissipation. The
temperature rise is computed by multiplying the maximum expected power dissipation by the sum of the thermal
resistances between the junction and the case θJC), the case to heatsink θCS), and the heatsink to ambient
θSA). Thermal resistances are measures of how effectively an object dissipates heat. Typically, the larger the
device, the more surface area available for power dissipation and the lower the object's thermal resistance.
Figure 19 illustrates these thermal resistances for (a) a SOT223 package mounted in a JEDEC low-K board, and
(b) a DDPAK package mounted on a JEDEC high-K board.
Figure 19. Thermal Resistances
Equation 2 summarizes the computation:
The RθJC is specific to each regulator as determined by its package, lead frame, and die size provided in the
regulator's data sheet. The RθSA is a function of the type and size of heatsink. For example, black body radiator
type heatsinks can have RθCS values ranging from 5°C/W for very large heatsinks to 50°C/W for very small
heatsinks. The RθCS is a function of how the package is attached to the heatsink. For example, if a thermal
compound is used to attach a heatsink to a SOT223 package, RθCSof 1°C/W is reasonable.
Even if no external black body radiator type heatsink is attached to the package, the board on which the
regulator is mounted provides some heatsinking through the pin solder connections. Some packages, like the
DDPAK and SOT223 packages, use a copper plane underneath the package or the circuit board's ground plane
for additional heatsinking to improve their thermal performance. Computer-aided thermal modeling can be used
to compute very accurate approximations of an integrated circuit's thermal performance in different operating
environments (e.g., different types of circuit boards, different types and sizes of heatsinks, and different air flows,
etc.). Using these models, the three thermal resistances can be combined into one thermal resistance between
junction and ambient θJA). This RθJAis valid only for the specific operating environment used in the computer
model.
Equation 2 simplifies into Equation 3:
Rearranging Equation 3 gives Equation 4:
Using Equation 3 and the computer model generated curves shown in Figure 20 and Figure 23, a designer can
quickly compute the required heatsink thermal resistance/board area for a given ambient temperature, power
dissipation, and operating environment.
8
相关PDF资料 |
PDF描述 |
|---|---|
| TPS726126DCQ | LOW INPUT VOLTAGE, 1-A LOW-DROPOUT LINEAR REGULATORS WITH SUPERVISOR |
| TPS726126DCQR | LOW INPUT VOLTAGE, 1-A LOW-DROPOUT LINEAR REGULATORS WITH SUPERVISOR |
| TPS72615KTTR | LOW INPUT VOLTAGE, 1-A LOW-DROPOUT LINEAR REGULATORS WITH SUPERVISOR |
| TPS72615KTTT | LOW INPUT VOLTAGE, 1-A LOW-DROPOUT LINEAR REGULATORS WITH SUPERVISOR |
| TPS72616DCQR | LOW INPUT VOLTAGE, 1-A LOW-DROPOUT LINEAR REGULATORS WITH SUPERVISOR |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS726126DCQ | 功能描述:低压差稳压器 - LDO Low Input Voltage Any Cap 1A 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 |
| TPS726126DCQG4 | 功能描述:低压差稳压器 - LDO Low Input Voltage Any Cap 1A 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 |
| TPS726126DCQR | 功能描述:低压差稳压器 - LDO Low Input Voltage Any Cap 1A 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 |
| TPS726126DCQRG4 | 功能描述:低压差稳压器 - LDO Low Input Voltage Any Cap 1A 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 |
| TPS72615DCQ | 功能描述:低压差稳压器 - LDO Low Input Voltage Any Cap 1A 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。