TLV755P datasheet(12/51 Pages) TI2

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6 Detailed Description

6.1 Overview

The TLV755P low-dropout regulator (LDO) consumes low quiescent current and delivers excellent line and

load transient performance. The TLV755P is optimized for a wide variety of applications by supporting an input

voltage range from 1.45V to 5.5V. To minimize cost and solution size, the device is offered in fixed output

voltages ranging from 0.6V to 5V to support the lower core voltages of modern microcontrollers (MCUs).

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

is –40°C to +125°C.

6.2 Functional Block Diagram

Bandgap

Thermal

Shutdown

UVLO

Logic

Current

Limit

120 Ÿ

GND

OUT

R2 = 550kΩ, R1 = adjustable.

6.3 Feature Description

6.3.1 Undervoltage Lockout (UVLO)

An undervoltage lockout (UVLO) circuit disables the output until the input voltage is greater than the rising UVLO

voltage (VUVLO). This circuit makes sure the device does not exhibit 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 120Ω pulldown resistor.

6.3.2 Enable (EN)

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

forcing the EN pin below VLO. If shutdown capability is not required, connect EN to IN.

The device has an internal pulldown that connects a 120Ω 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 120Ω pulldown resistor. Equation 1 calculates the time constant τ:

120·R

120+R

·C

OUT

(1)

TLV755P

SBVS320D – NOVEMBER 2017 – REVISED SEPTEMBER 2024

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