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TLV751 数据表(PDF) 15 Page - Texas Instruments

部件名 TLV751
功能描述  TLV751 Dual, 500-mA, High-Accuracy, LDO in a Small-Size Package
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

TLV751 数据表(HTML) 15 Page - Texas Instruments

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TLV751
www.ti.com
SBVS385B – DECEMBER 2019 – REVISED APRIL 2020
Product Folder Links: TLV751
Submit Documentation Feedback
Copyright © 2019–2020, Texas Instruments Incorporated
7.4 Device Functional Modes
7.4.1 Device Functional Mode Comparison
The Device Functional Mode Comparison table shows the conditions that lead to the different modes of
operation. See the Electrical Characteristics table for parameter values.
Table 1. Device Functional Mode Comparison
OPERATING MODE
PARAMETER
VIN
VEN
IOUT
TJ
Normal operation
VIN > VOUT(nom) + VDO and VIN > VIN(min)
VEN > VEN(HI)
IOUT < IOUT(max)
TJ < TSD(shutdown)
Dropout operation
VIN(min) < VIN < VOUT(nom) + VDO
VEN > VEN(HI)
IOUT < IOUT(max)
TJ < TSD(shutdown)
Disabled
(any true condition
disables the device)
VIN < VUVLO
VEN < VEN(LOW)
Not applicable
TJ > TSD(shutdown)
7.4.2 Normal Operation
The device regulates to the nominal output voltage when the following conditions are met:
The input voltage is greater than the nominal output voltage plus the dropout voltage (VOUT(nom) + VDO)
The output current is less than the current limit (IOUT < ICL)
The device junction temperature is less than the thermal shutdown temperature (TJ < TSD)
The enable voltage has previously exceeded the enable rising threshold voltage and has not yet decreased to
less than the enable falling threshold
7.4.3 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 mode. In this mode, the output voltage
tracks the input voltage. During this mode, the transient performance of the device becomes significantly
degraded because the pass transistor is in the ohmic or triode region, and acts as a switch. 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,
directly after being in a normal regulation state, but not during startup), the pass transistor is driven into the
ohmic or triode region. When the input voltage returns to a value greater than or equal to the nominal output
voltage plus the dropout voltage (VOUT(NOM) + VDO), the output voltage can overshoot for a short period of time
while the device pulls the pass transistor back into the linear region.
7.4.4 Disabled
The output of the device can be shutdown by forcing the voltage of the enable pin to less than the maximum EN
pin low-level input voltage (see the Electrical Characteristics table). When disabled, the pass transistor is turned
off, internal circuits are shutdown, and the output voltage is actively discharged to ground by an internal
discharge circuit from the output to ground.


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