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TLV755P データシート(PDF) 10 Page - Texas Instruments

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部品番号 TLV755P
部品情報  500-mA, Low IQ, Small Size, Low Dropout Regulator
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

TLV755P データシート(HTML) 10 Page - Texas Instruments

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TLV755P
SBVS320 – NOVEMBER 2017
www.ti.com
Product Folder Links: TLV755P
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Copyright © 2017, Texas Instruments Incorporated
(1)
All table conditions must be met.
(2)
The device is disabled when any condition is met.
7.4 Device Functional Modes
Table 1 lists a comparison between the normal, dropout, and disabled modes of operation.
Table 1. Device Functional Modes Comparison
OPERATING MODE
PARAMETER
VIN
EN
IOUT
TJ
Normal(1)
VIN > VOUT(NOM) + VDO
VEN > VHI
IOUT < ICL
TJ < TSD
Dropout(1)
VIN < VOUT(NOM) + VDO
VEN > VHI
TJ < TSD
Disabled(2)
VIN < VUVLO
VEN < VLO
TJ > TSD
7.4.1 Normal Operation
The device regulates to the nominal output voltage when all following conditions are met:
The input voltage is greater than the nominal output voltage plus the dropout voltage (VOUT(NOM) + VDO)
The enable voltage has previously exceeded the enable rising threshold voltage and has not decreased
below the enable falling threshold
The output current is less than the current limit (IOUT < ICL)
The device junction temperature is less than the thermal shutdown temperature (TJ < TSD)
7.4.2 Dropout Operation
If the input voltage is lower than the nominal output voltage plus the specified dropout voltage, but all other
conditions are met for normal operation, the device operates in dropout. In this mode, the output voltage tracks
the input voltage. During this mode, the transient performance of the device degrades because the pass device
is in a triode state and no longer controls the current through the LDO. Line or load transients in dropout can
result in large output-voltage deviations.
When the device is in a steady dropout state (defined as when the device is in dropout, VIN < VOUT(NOM) + VDO,
right after being in a normal regulation state, but not during startup), the pass-FET is driven as hard as possible
when the control loop is out of balance. During the normal time required for the device to regain regulation, VIN
VOUT(NOM) + VDO, VOUT can overshoot VOUT(NOM) during fast transients.
7.4.3 Disabled
The output is shut down by forcing the enable pin below VLO. When disabled, the pass device is turned off,
internal circuits are shut down, and the output voltage is actively discharged to ground by an internal switch from
the output to ground. The active pulldown resistor is on when sufficient input voltage is provided.


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