TLV755P datasheet(16/49 Pages) TI1

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Input Voltage

Output Voltage

Output Voltage in

normal regulation.

Dropout

VOUT = VIN - VDO

VIN = VOUT(nom) + VDO

Response time for

LDO to get back into

regulation.

Load current discharges

output voltage.

Time

Figure 7-1. Start-Up Into Dropout

Line transients out of dropout can also cause overshoot on the output of the regulator. These overshoots are

caused by the error amplifier having to drive the gate capacitance of the pass transistor and bring the gate

back to the correct voltage for proper regulation. Figure 7-2 illustrates what is happening internally with the gate

voltage and how overshoot is caused during operation. When the LDO is placed in dropout, the gate voltage

(VGS) is pulled all the way down to ground to give the pass transistor the lowest on-resistance as possible.

However, if a line transient occurs when the device is in dropout, the loop is not in regulation and causes the

output to overshoot until the loop responds and the output current pulls the output voltage back down into

regulation. If these transients are not acceptable, then continue to add input capacitance in the system until the

transient is slow enough to reduce the overshoot.

TLV755P

SBVS320D – NOVEMBER 2017 – REVISED SEPTEMBER 2024

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TLV755P Datasheet(PDF) 16 Page - Texas Instruments