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參數資料
| 型號： | TPS776XX |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | FAST-TRANSIENT-RESPONSE 500mA LOW-DROPOUT VOLTAGE REGULATORS |
| 中文描述： | 快速瞬態響應500mA的低壓差電壓調節器 |
| 文件頁數： | 15/28頁 |
| 文件大小： | 791K |
| 代理商： | TPS776XX |
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Regulator Protection
The TPS775xx and TPS776xx PMOS-pass transistors have a built-in back diode that conducts reverse currents
when the input voltage drops below the output voltage (for example, during power down). Current is conducted
from the output to the input and is not internally limited. When extended reverse voltage is anticipated, external
limiting may be appropriate.
Power Dissipation and Junction Temperature
Specified regulator operation is assured to a junction temperature of +125
°
C; the maximum junction temperature
should be restricted to +125
°
C under normal operating conditions. This restriction limits the power dissipation
the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits,
calculate the maximum allowable dissipation, P
D(max)
, and the actual dissipation, P
D
, which must be less than or
equal to P
D(max)
.
The maximum-power-dissipation limit is determined using the following equation:
P
=
D(max)
R
q
JA
T
J(max)
T
-
A
1
derating factor
from the dissipation rating tables
T
A
is the ambient temperature
The regulator dissipation is calculated using:
P = (V
V
) x I
-
IN
OUT
OUT
TPS775xx, TPS776xx
SLVS232I–SEPTEMBER 1999–REVISED AUGUST 2007
APPLICATION INFORMATION (continued)
The TPS775xx and TPS776xx also feature internal current limiting and thermal protection. During normal
operation, the TPS775xx and TPS776xx limit output current to approximately 1.7A. When current limiting
engages, the output voltage scales back linearly until the overcurrent condition ends. While current limiting is
designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the
package. If the temperature of the device exceeds +150
°
C(typ), thermal-protection circuitry shuts it down. Once
the device has cooled below +130
°
C(typ), regulator operation resumes.
where:
T
J(max)
is the maximum allowable junction temperature
R
θ
JA
is the thermal resistance junction-to-ambient for the package, and is calculated as
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the
thermal protection circuit.
15
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| TPS77701D | 功能描述:低壓差穩壓器 - LDO Fast-Tran-Res 750-mA 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS77701DG4 | 功能描述:低壓差穩壓器 - LDO Fast-Tran-Res 750-mA 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS77701DR | 功能描述:低壓差穩壓器 - LDO Fast-Tran-Res 750-mA 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS77701DRG4 | 功能描述:低壓差穩壓器 - LDO Fast-Tran-Res 750-mA 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS77701PWP | 功能描述:低壓差穩壓器 - LDO Fast-Tran-Res 750-mA 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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