TPS40322_16 datasheet(12/47 Pages) TI1

Part #	TPS40322

Description	Dual Output or Two-Phase Synchronous Buck Controller

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Manufacturer	TI1 [Texas Instruments]

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TPS40322

SLUSAF8E – JULY 2011 – REVISED JANUARY 2016

www.ti.com

7 Detailed Description

7.1 Overview

The TPS40322 is a flexible synchronous buck controller. It can be used as a dual-output controller, or as a two-

phase, single-output controller. It operates with a wide input range from 3 V to 20 V and can generate an

accurate regulated output as low as 600 mV.

In dual output mode, voltage mode control with input feedforward architecture is implemented. With this

architecture, the benefits are less noise sensitivity, no control instability issues for small DCR applications, and a

smaller minimum controllable on-time, often desired for high conversion ratio applications.

In two-phase, single-output mode, a current-sharing loop is implemented to ensure a balance of current between

phases. Because the induced error current signal to the loop is much smaller when compared to the PWM ramp

amplitude, the control loop is modeled as voltage mode with input feedforward.

DESIGN NOTE

When the device is operating in dual output mode, DIFFO must be floating or tied to BP6.

12

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