參數(shù)資料
型號： TPS75101QPWPRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 可調正電壓單路輸出LDO穩(wěn)壓器
英文描述： 1.5 V-5 V ADJUSTABLE POSITIVE LDO REGULATOR, PDSO20
封裝： PLASTIC, HTSSOP-20
文件頁數(shù)： 13/30頁
文件大?。?/td> 625K
代理商： TPS75101QPWPRQ1
TPS75101Q1, '75115Q1, '75118Q1, '75125Q1, '75133Q1 WITH POWER GOOD
TPS75301Q1, TPS75315Q1, TPS75318Q1, TPS75325Q1, TPS75333Q1 WITH RESET
FAST TRANSIENT RESPONSE 1.5A LOW DROPOUT VOLTAGE REGULATORS
SGLS159A APRIL 2003 REVISED APRIL 2008
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
regulator protection
The TPS751xxQ or TPS753xxQ 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 TPS751xxQ or TPS753xxQ also features internal current limiting and thermal protection. During normal
operation, the TPS751xxQ or TPS753xxQ limits output current to approximately 3.3 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, PD(max), and the actual dissipation, PD, which must be less than or
equal to PD(max).
The maximum-power-dissipation limit is determined using the following equation:
P
D(max) +
T
J
max
* T
A
RqJA
Where:
TJmax is the maximum allowable junction temperature
TA is the ambient temperature.
RθJA is the thermal resistance junction-to-ambient for the package, i.e., 34.6°C/W for the 20-terminal
PWP with no airflow (see Table 1).
(3)
The regulator dissipation is calculated using:
P
D +
V
I *
V
O
I
O
(4)
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the thermal
protection circuit.
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