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參數資料
| 型號： | TPS76828QPWPRG4 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | FAST-TRANSIENT-RESPONSE 1-A LOW-DROPOUT VOLTAGE REGULATORS |
| 中文描述： | 快速瞬態響應1 -低壓差電壓調節器 |
| 文件頁數： | 17/23頁 |
| 文件大小： | 430K |
| 代理商： | TPS76828QPWPRG4 |
www.ti.com
REGULATOR PROTECTION
The TPS768xx PMOS-pass transistor has a built-in back diode that conducts reverse currents when the input
voltage drops below the output voltage (e.g., 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:
PD(max)
TJmax
TA
RJA
where:
T
J
max
is the maximum allowable junction temperature.
R
θ
JA
is the thermal resistance junction-to-ambient for the package, i.e., 172
°
C/W for the 8-terminal
SOIC and 32.6
°
C/W for the 20-terminal PWP with no airflow.
T
A
is the ambient temperature.
(3)
PD
VI
VO
IO
(4)
TPS76815Q, TPS76818Q, TPS76825Q
TPS76827Q, TPS76828Q, TPS76830Q
TPS76833Q, TPS76850Q, TPS76801Q
SLVS211J–JUNE 1999–REVISED OCTOBER 2004
APPLICATION INFORMATION (continued)
The TPS768xx also features internal current limiting and thermal protection. During normal operation, the
TPS768xx limits output current to approximately 1.7 A. 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.
The regulator dissipation is calculated using:
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the
thermal protection circuit.
17
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS76830QD | 功能描述:低壓差穩壓器 - LDO Micropower 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 |
| TPS76830QDG4 | 功能描述:低壓差穩壓器 - LDO Micropower 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 |
| TPS76830QDR | 功能描述:低壓差穩壓器 - LDO Micropower 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 |
| TPS76830QDRG4 | 功能描述:低壓差穩壓器 - LDO Micropower 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 |
| TPS76830QPWP | 功能描述:低壓差穩壓器 - LDO Micropower 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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