參數(shù)資料
型號(hào)： TPS77327DGKR
廠商： Texas Instruments, Inc.
英文描述： 250-mA LDO REGULATORS WITH 8-PIN MSOP PACKAGING
中文描述： 250毫安LDO穩(wěn)壓器有8引腳MSOP封裝
文件頁(yè)數(shù)： 19/24頁(yè)
文件大?。?/td> 347K
代理商： TPS77327DGKR
TPS77301/315/316/318/327/328/333/350 WITH RESET OUTPUT
TPS77401
/
415
/
418
/
427
/
428
/
433
/
450 WITH POWER GOOD OUTPUT
250-mA LDO REGULATORS WITH 8-PIN MSOP PACKAGING
SLVS281E
–
FEBRUARY 2000
–
REVISED JULY 2001
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
regulator protection
The TPS773xx or TPS774xx 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.
The TPS773xx or TPS774xx also features internal current limiting and thermal protection. During normal
operation, the TPS773xx or TPS774xx limits output current to approximately 0.9 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.
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., 266.2
°
C/W for the 8-terminal
MSOP with no airflow.
T
A
is the ambient temperature.
The regulator dissipation is calculated using:
PD
VI
VO
IO
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the
thermal protection circuit.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS77327DGKRG4 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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(dòng)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
TPS77328DGK 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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(dòng)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
TPS77328DGKG4 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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(dòng)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
TPS77328DGKR 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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(dòng)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
TPS77328DGKRG4 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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(dòng)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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