TLV755P datasheet(12/47 Pages) TI1

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120·R

120+R

·C

OUT

Bandgap

Thermal

Shutdown

UVLO

Logic

Current

Limit

120

GND

OUT

TLV755P

SBVS320A – NOVEMBER 2017 – REVISED MAY 2018

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7 Detailed Description

7.1 Overview

The TLV755P belongs to a family of next-generation, low-dropout regulators (LDOs). This device 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 1.45 V to 5.5 V. To minimize cost and

solution size, the device is offered in fixed output voltages ranging from 0.6 V to 5 V 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.

7.2 Functional Block Diagram

NOTE: R2 = 550 kΩ, R1 = adjustable.

7.3 Feature Description

7.3.1 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 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 120-Ω pulldown resistor.

7.3.2 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 120-Ω 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 120-Ω pulldown resistor. Equation 1 calculates the time constant τ:

(1)

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