TLV75801PDBVT datasheet(13/35 Pages) TI1

13 / 35 page

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Band Gap

Thermal

Shutdown

UVLO

Logic

Current

Limit

GND

OUT

TLV758P

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SBVS351C – APRIL 2018 – REVISED MARCH 2019

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7 Detailed Description

7.1 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 ideal 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.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 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).

7.3.2 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)

TLV75801PDBVT Datasheet(PDF) 13 Page - Texas Instruments