TPS65400-Q1 datasheet(11/76 Pages) TI

No de pièce	TPS65400-Q1

Description	TPS65400 4.5- to 18-V Input Flexible Power Management Unit With PMBus/I2C Interface

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TPS65400

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SLVSCQ9B – NOVEMBER 2014 – REVISED SEPTEMBER 2015

8 Detailed Description

8.1 Overview

The TPS65400 is an integrated PMU optimized for applications that require small form factor and high-power

conversion efficiency enabling small space-constrained equipment with high-ambient operating temperature

without cooling. It provides high-power efficiency at a system level by enabling a single-stage conversion from an

intermediate distribution bus with an optimized combination of regulators.

The TPS65400 consists of four high-current buck-switching regulators (SW1, SW2, SW3, and SW4) with

integrated FETs. The switching power supplies are intended for powering high-current digital circuits such as the

processor, FPGA, ASIC, memory, and digital I/Os. SW1 and SW2 support 4 A each, and SW3 and SW4 support

2 A each. Each regulator’s switching frequency is independently adjustable up to 2.2 MHz.

Current limit programmability on each switcher enables optimization of inductor ratings for a particular application

configuration not requiring the maximum current capability.

The TPS65400 can be powered from a single-input voltage rail between 4.5 and 18 V, making it suitable for

applications running off a 5- or 12-V intermediate power distribution bus.

Sequencing requirements can be met using the individual enable pins or by programming the sequence through

the I2C bus into the onboard EEPROM. Output voltages can be set through external resistor networks and VREF

can be programmed from 0.6 to 1.87 V in 10-mV steps. All control and status info can be accessed through a

PMBus-compatible I2C bus.

The TPS65400 provides a high level of flexibility for monitoring and control through the I2C bus while providing

the option of programmability through the use of external components and voltage levels for systems not using

I2C.

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