6 Detailed Description

6.1 Overview

The TLV757P is a next-generation, low-dropout regulator (LDO). This device consumes low quiescent current

and delivers excellent line and load transient performance. The TLV757P is optimized for a wide variety of

applications by supporting an input voltage range from 1.4V to 5.5V. To minimize cost and solution size, the

device is offered in fixed output voltages ranging from 0.6V to 5V. This range supports 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

IN

EN

GND

OUT

R1

R2

A.

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 pull-down 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:

t

=

120·R

L

120+R

L

·C

OUT

(1)

The EN pin is independent of the input pin. However, if the EN pin is driven to a higher voltage than VIN, the

current into the EN pin increases. This effect is illustrated in Figure 5-24. When the EN voltage is higher than

TLV757P

SBVS322C – OCTOBER 2017 – REVISED MARCH 2024

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