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TLV70245DBVR Datasheet(PDF) 12 Page - Texas Instruments

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Part No. TLV70245DBVR
Description  300-mA, Low-IQ, Low-Dropout Regulator
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TLV70245DBVR Datasheet(HTML) 12 Page - Texas Instruments

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TLV702
SLVSAG6C – SEPTEMBER 2010 – REVISED MARCH 2015
www.ti.com
Feature Description (continued)
7.3.3 Dropout Voltage
The TLV702 uses a PMOS pass transistor to achieve low dropout. When (VIN – VOUT) is less than the dropout
voltage (VDO), the PMOS pass device is in the linear (triode) region of operation and the input-to-output
resistance is the RDS(on) of the PMOS pass element. VDO scales approximately with output current because the
PMOS device behaves as a resistor in dropout.
As with any linear regulator, PSRR and transient response are degraded as (VIN – VOUT) approaches dropout.
This effect is shown in Figure 13.
7.3.4 Undervoltage Lockout
The TLV702 uses a UVLO circuit to keep the output shut off until internal circuitry is operating properly.
7.4 Device Functional Modes
7.4.1 Normal Operation
The device regulates to the nominal output voltage under the following conditions:
The input voltage is greater than the nominal output voltage added to the dropout voltage.
The output current is less than the current limit.
The input voltage is greater than the UVLO voltage.
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 mode. In this condition, the output
voltage is the same as the input voltage minus the dropout voltage. The transient performance of the device is
significantly degraded because the pass device is in a triode state and no longer regulates the output voltage of
the LDO. Line or load transients in dropout may result in large output voltage deviations.
Table 1 lists the conditions that lead to the different modes of operation.
Table 1. Device Functional Mode Comparison
PARAMETER
OPERATING MODE
VIN
IOUT
Normal mode
VIN > VOUT (nom) + VDO
IOUT < ICL
Dropout mode
VIN < VOUT (nom) + VDO
IOUT < ICL
Current limit
VIN > UVLO
IOUT > ICL
12
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