TPS65022_16 datasheet(32/47 Pages) TI1

Part #	TPS65022

Description	Power Management IC for Li-Ion Powered Systems

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Manufacturer	TI1 [Texas Instruments]

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32 / 47 page

TPS65022

SLVS667B – JULY 2006 – REVISED JANUARY 2016

www.ti.com

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

8.1.1 Input Voltage Connection

The low power section of the control circuit for the step-down converters DCDC1, DCDC2 and DCDC3 is

supplied by the VCC pin while the circuitry with high power such as the power stage is powered from the

VINDCDC1, VINDCDC2, and VINDCDC3 pins. For proper operation of the step-down converters, VINDCDC1,

VINDCDC2, VNDCDC3, and Vcc need to be tied to the same voltage rail. Step-down converters that are planned

to be not used, still need to be powered from their input pin on the same rails than the other step-down

converters and VCC.

LDO1 and LDO2 share a supply voltage pin which can be powered from the VCC rails or from a voltage lower

than VCC, for example, the output of one of the step-down converters as long as it is operated within the input

voltage range of the LDOs. If both LDOs are not used, the VINLDO pin can be tied to GND.

8.1.2 Unused Regulators

If a step-down converter is not used, the input supply voltage pin VINDCDCx must connect to the VCC rail along

with supply input of the other step-down converters. TI recommends closing the control loop such that an

inductor and output capacitor is added in the same way when operated normally. If one of the LDOs is not used,

its output capacitor should be added as well. If both LDOs are not used, the input supply pin and the output pins

of the LDOs (VINLDO, VLDO1, VLDO2) should be tied to GND.

32

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