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參數(shù)資料
| 型號： | TPS73712 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 1A Low-Dropout Regulator with Reverse Current Protection |
| 中文描述： | 1A低壓差穩(wěn)壓器的反向電流保護(hù) |
| 文件頁數(shù)： | 12/18頁 |
| 文件大小： | 578K |
| 代理商： | TPS73712 |
www.ti.com
THERMAL PROTECTION
Thermal protection disables the output when the
junction temperature rises to approximately +160
°
C,
allowing the device to cool. When the junction
temperature cools to approximately +140
°
C, the
output circuitry is again enabled. Depending on
power dissipation, thermal resistance, and ambient
temperature, the thermal protection circuit may cycle
on and off. This cycling limits the dissipation of the
regulator,
protecting
it
overheating.
POWER DISSIPATION
The ability to remove heat from the die is different for
each
package
type,
considerations in the PCB layout. The PCB area
around the device that is free of other components
moves the heat from the device to the ambient air.
Performance data for JEDEC low- and high-K boards
are shown in the
Power Dissipation Ratings
table.
Using heavier copper will increase the effectiveness
in removing heat from the device. The addition of
plated through-holes to heat-dissipating layers will
also improve the heatsink effectiveness.
P
D
V
IN
V
OUT
I
OUT
(5)
Package Mounting
Solder
pad
TPS737xx are presented in Application Bulletin
Solder Pad Recommendations for Surface-Mount
Devices
(
SBFA015
),
available
Instruments web site at
www.ti.com
.
TPS737xx
SBVS067C–JANUARY 2006–REVISED AUGUST 2006
presenting
different
from
damage
due
to
Any tendency to activate the thermal protection
circuit indicates excessive power dissipation or an
inadequate heatsink. For reliable operation, junction
temperature should be limited to +125
°
C maximum.
To estimate the margin of safety in a complete
design (including heatsink), increase the ambient
temperature until the thermal protection is triggered;
use worst-case loads and signal conditions. For good
reliability, thermal protection should trigger at least
+35
°
C
above
the
maximum
condition of your application. This produces a
worst-case junction temperature of +125
°
C at the
highest
expected
ambient
worst-case load.
Power dissipation depends on input voltage and load
conditions. Power dissipation (P
) is equal to the
product of the output current times the voltage drop
across the output pass element (V
IN
to V
OUT
):
Power dissipation can be minimized by using the
lowest possible input voltage necessary to assure
the required output voltage.
expected
ambient
temperature
and
footprint
recommendations
for
the
The internal protection circuitry of the TPS737xx has
been
designed
to
protect
conditions. It was not intended to replace proper
heatsinking. Continuously running the TPS737xx into
thermal shutdown will degrade device reliability.
against
overload
from
the
Texas
12
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| TPS73718DCQ | 功能描述:低壓差穩(wěn)壓器 - LDO Cap-Free 1A LDO Reg 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 |
| TPS73718DCQG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Sgl Output LDO 1A Fixed 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 |
| TPS73718DCQR | 功能描述:低壓差穩(wěn)壓器 - LDO Cap-Free 1A LDO Reg 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 |
| TPS73718DCQRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Sgl Output LDO 1A Fixed 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 |
| TPS73718DRBR | 功能描述:低壓差穩(wěn)壓器 - LDO Sgl Output LDO,1A, Fixed 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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