6 Detailed Description

6.1 Overview

The TLV758P low-dropout regulators (LDO) consumes low quiescent current and delivers excellent line and

load transient performance. These characteristics, combined with low noise and good PSRR with low dropout

voltage, make this device designed for portable consumer applications.

This regulator offers foldback current limit, shutdown, and thermal protection. The operating junction temperature

for this device is –40°C to +125°C.

6.2 Functional Block Diagram

+

–

Band Gap

Thermal

Shutdown

UVLO

Logic

Current

Limit

95

IN

EN

GND

OUT

FB

6.3 Feature Description

6.3.1 Undervoltage Lockout (UVLO)

The TLV758P uses an undervoltage lockout (UVLO) circuit that disables the output until the input voltage

is greater than the rising UVLO voltage (VUVLO). This circuit ensures that the device does not exhibit any

unpredictable behavior when the supply voltage is lower than the operational range of the internal circuitry.

When VIN is less than VUVLO, the output is connected to ground with a pulldown resistor (RPULLDOWN).

6.3.2 Shutdown

The enable pin (EN) is active high. Enable the device by forcing the EN pin to exceed VEN(HI). Turn off the device

by forcing the EN pin to drop below VEN(LO). If shutdown capability is not required, connect EN to IN.

The TLV758P has an internal pulldown MOSFET that connects an RPULLDOWN resistor to ground when the

device is disabled. The discharge time after disabling depends on the output capacitance (COUT) and the load

resistance (RL) in parallel with the pulldown resistor (RPULLDOWN). Equation 1 calculates the time constant:

τ = ( RPULLDOWN × RL) / (RPULLDOWN + RL)

(1)

6.3.3 Foldback Current Limit

The device has an internal current limit circuit that protects the regulator during transient high-load current faults

or shorting events. The current limit is a hybrid brick-wall-foldback scheme. The current limit transitions from a

brick-wall scheme to a foldback scheme at the foldback voltage (VFOLDBACK). In a high-load current fault with

the output voltage above VFOLDBACK, the brick-wall scheme limits the output current to the current limit (ICL).

When the voltage drops below VFOLDBACK, a foldback current limit activates that scales back the current as the

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TLV758P

SBVS351D – APRIL 2018 – REVISED OCTOBER 2023

Copyright © 2023 Texas Instruments Incorporated

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Product Folder Links: TLV758P