TPS6521825_V01 datasheet(21/109 Pages) TI1

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TPS6521825

www.ti.com

SLDS260 – NOVEMBER 2019

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Detailed Description

5.1

Overview

The TPS6521825 provides three step-down converters, three load switches, three general-purpose I/Os,

two battery backup supplies, one buck-boost converter, and one LDO. The system can be supplied by a

regulated 5-V supply. A coin-cell battery can be added to supply the two always-on backup supplies. The

device is characterized across a –40°C to +105°C temperature range, which makes it suitable for various

industrial applications.

The I2C interface provides comprehensive features for using TPS6521825. All rails, load switches, and

GPIOs can be enabled and disabled. Voltage thresholds for the UVLO and supervisor can be customized.

Power-up

and

power-down

sequences

can

also

programmed

through

I2C.

Interrupts

for

overtemperature, overcurrent, and undervoltage can be monitored for the load-switches (LSx).

The integrated voltage supervisor monitors DCDC 1-4 and LDO1. It has two settings; the standard

settings only monitor for undervoltage, while the strict settings implement tight tolerances on both

undervoltage and overvoltage. A power-good signal is provided to report the regulation state of the five

rails.

The three hysteretic step-down converters can each supply up to 1.8 A of current. The default output

voltages for each converter can be adjusted through the I2C interface. DCDC1 and DCDC2 feature

dynamic voltage scaling with adjustable slew rate. The step-down converters operate in a low power mode

at light load, and can be forced into PWM operation for noise sensitive applications.

The battery backup supplies consist of two low power step-down converters optimized for very light loads

and are monitored with a separate power-good signal (PGOOD_BU). The converters can be configured to

operate as always-on supplies with the addition of a coin cell battery. The state of the battery can be

monitored over I2C.

TPS6521825 Folha de dados(PDF) 21 Page - Texas Instruments