7 Detailed Description

7.1 Overview

The TPS56320x is a 3-A integrated FET synchronous step-down buck converter that operates from 4.2-V to

17-V input voltage (VIN) and 0.6-V to 7-V output voltage. The device employs D-CAP3 control mode that

provides fast transient response with no external compensation components and an accurate feedback voltage.

The proprietary D-CAP3 control mode enables low external component count, ease of design, and optimization

of the power design for cost, size, and efficiency. The topology provides a seamless transition between CCM

operating mode at higher load condition and DCM operation at lighter load condition.

The Eco-mode version allows the TPS563203 to maintain high efficiency at light load. The FCCM mode version

allows the TPS563206 to maintain a fixed switching frequency and lower output voltage ripple. The TPS56320x

is able to adapt to both low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP,

and ultra-low ESR ceramic capacitors.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Adaptive On-Time Control and PWM Operation

The main control loop of the TPS56320x is adaptive on-time pulse width modulation (PWM) controller that

supports a proprietary D-CAP3 control mode. The D-CAP3 control mode combines adaptive on-time control with

an internal compensation circuit for pseudo-fixed frequency and low external component count configuration

with both low-ESR and ceramic output capacitors. It is stable even with virtually no ripple at the output. The

TPS56320x also includes an error amplifier that makes the output voltage very accurate

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TPS563203, TPS563206

SLUSEZ4 – MARCH 2023

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Product Folder Links: TPS563203 TPS563206