_

+

Current

Sense

R

1

R

2

V

IN

GND

V

OUT

I

LIM

Bandgap

Reference

V

R =840kW

2

TLV704

SBVS148D – OCTOBER 2010 – REVISED JANUARY 2015

www.ti.com

7 Detailed Description

7.1 Overview

output load current and temperature range. The devices are ensured to operate over a temperature range of

–40°C to 125°C.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Regulator Protection

The TLV704 series of LDO regulators use a PMOS-pass transistor that has a built-in back diode that conducts

reverse current when the input voltage drops below the output voltage (for example, during power down). Current

is conducted from the output to the input and is not internally limited. If extended reverse voltage operation is

anticipated, external limiting is appropriate.

The TLV704 features internal current limiting. During normal operation, the TLV704 limits output current to

approximately 250 mA. When current limiting engages, the output voltage scales back linearly until the

overcurrent condition ends. Do not exceed the rated maximum operating junction temperature of 125°C.

Continuously running the device under conditions where the junction temperature exceeds 125°C degrades

device reliability.

The ability to remove heat from the die is different for each package type, presenting different considerations in

the printed circuit board (PCB) layout. The PCB area around the device that is free of other components moves

the heat from the device to the ambient air. Performance data for JEDEC high-K boards are given in the Thermal

Information table. Using heavier copper increases the effectiveness in removing heat from the device. The

addition of plated through-holes to heat-dissipating layers also improves heatsink effectiveness. Power

output current and the voltage drop across the output pass element, as shown in Equation 2.

10

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