Texas Instruments TPS6021 Series User manual

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August 2000 Power Management Products

User’s Guide

SLVU030

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Related Documentation From Texas Instruments

iii

Read This First

Preface

Read This First

About This Manual

This user’s guide describes the evaluation module (EVM)

TPS60210EVM-167.ThisEVMhelpstoevaluatetheperformanceoftheregu-

lated low-ripple charge pump dc/dc converter TPS60210. The EVM has the

dimension of a 14-pin dual inline package and the board is a single-layer

board. The board design is optimized for performance and space.

The user’s guide also documents the necessary changes to use the board for

the other devices of the TPS6021x family.

How to Use This Manual

For more information about the EVM, please read Chapter 1, Description of

the EVM. Chapter 2 includes the Physical Data and the Setup of the EVM.

Related Documentation From Texas Instruments

DatasheetofTPS60210/TPS60211/TPS60212/TPS60213(literaturenumber

SLVS296)

Erich Bayer, Alexander Müller, Hans Schmeller, and Günter Sporer: Charge

Pump Technology Optimized for Battery-Operated Systems, EE-Times

Special Seminar Series, Analog & Mixed Signal Technology, Oct. 99

Brigitte Kormann: TPS6014x Charge Pump Evaluation Module Design Guide

(literature number SLVU023)

Brigitte Kormann: TPS6010x/TPS6011x Charge Pump Application Report

(literature number SLVA070)

Running Title—Attribute Reference

Contents

1 Description of the EVM 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Physical Data and Setup of the EVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Schematic of the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Layout of the EVM 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Setup of the EVM 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Evaluation Information 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

2–1 Schematic of the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Placement of the Components 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Single Layer of the EVM 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 Actual Size of the EVM, 17,9 mm ×10,2 mm 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

2–1 Bill of Material for the TPS60210 EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Pin Assignment of the Board to a 14-Pin Dual-In-Line Socket 2-5. . . . . . . . . . . . . . . . . . . . . . .

1-1

Description of the EVM

The Texas Instruments TPS60210 charge pump is a regulated voltage dou-

bler. The TPS60210 delivers 3.3-V output voltage (VO) from a 1.8-V to 3.6-V

inputvoltage(VI).Theoutputcurrent(IO)is100mAminimum,foraninputvolt-

age (VI) of 2.0 V or higher.

For output currents below 2 mA, the device can be operated in the snooze

mode(SNOOZE= 0). Thisis an operatingmode, where thequiescent current

is drastically reduced. In this mode, VOis regulated to 3.3 V ±6%. The low

quiescentcurrentis achievedbydisablingmostoftheinternalcircuitryaslong

asVOishighenough.WhenVOdecreases,thedeviceoperatesforashortpe-

riodoftimeinnormal mode, toboostVO.Theinternalcircuitryis thendisabled

again. This reduces the quiescent current to a typical value of only 2 µA. If the

deviceisprogrammedto operate in snooze modeandtheIOincreasesabove

2 mA, the device enters the startup mode to increase VO.

Additionally, the TPS60210 has a low battery detector (LBI input and LBO

output).Thetripvoltageof the LBIinputistypically1.18V.TheTPS60210can

beprogrammedwithan externalresistivedividertothespecific tripvoltagefor

theapplication.OntheEVM,theresistivedividerontheLBIinputisconnected

to VIand the trip voltage is set to 2.0 V, typically. The LBO output is an

open-drain output and is in a high-impedance state as long as the voltage at

LBIisabovethetripvoltage.A1-MΩpullupresistortoVOisaddedontheEVM

to get a defined high signal as long as the voltage at LBI is above the trip

voltage.

For simple evaluation, a 1-MΩresistor between VIand the SNOOZE pin is

added to operate the TPS60210 in normal mode.

A minimum of four external capacitors for a push-pull voltage doubler charge

pumparerequired.TheEVMisbuiltwiththesefourcapacitors.Forevaluation,

it is possible to use other capacitor values like those given in the application

sectionoftheTPS6021xdatasheet(literaturenumberSLVS296).Thecapaci-

tors on the EVM are ceramic capacitors. The ESR of all other capacitor types

is too high to get good performance.

Chapter 1

1-2

The TPS60210 EVMs can also be used to evaluate the other devices of this

family(TPS60211, TPS60212, and TPS60213). For that purpose, replace the

integrated circuit. For the TPS60211 and TPS60213, the LBI resistors should

be removed and LBI connected to GND. The LBO pullup resistor works as

power good (PG) pullup, and the LBO pad gives the PG signal.

Free samples of the other parts of the TPS6021x family can be ordered from

http://www.ti.com. Use the

SCPart NumberSearch

to go to the productfolder

of the specific device.

2-1

Physical Data and Setup of the EVM

This section shows the schematic, the layout, and setup of the EVM. The

layout of a charge pump circuit is critical; therefore, the given layout can be

used as a reference and helps to reduce design and evaluation time.

Topic Page

2.1 Schematic of the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Layout of the EVM 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Setup of the EVM 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Evaluation Information 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 2

Schematic of the EVM

2-2

2.1 Schematic of the EVM

Figure 2–1 shows the schematic of the EVM. For this EVM, only ceramic ca-

pacitors with X5R or X7R material are used.

Figure 2–1.Schematic of the EVM

OUTPUT

3.3 V, 100 mA

INPUT

1.8 V to 3.6 V

1µFC2

1µF

2.2 µF

2.2 µFR1

10 R3

Low Battery

Warning

C1–

C1+

LBI

TPS60210

OUT

C2–

C2+

LBO

GND

SNOOZE

100 nF

Table 2–1.Bill of Material for the TPS60210 EVM

Component Value Part Number Manufacturer Description

C1, C2 1 µF, 10 V, 0805 LMK212BJ105KG–T Taiyo Yuden Flying capacitors

C3, C4 2.2 µF, 16 V, 1206 EMK316BJ225KL–T Taiyo Yuden Input and output capacitors

C5 100 nF Filter capacitor for the LBI

input signal

IC1 TPS60210 Texas Instruments

R1 402 kΩE96-Series LBI input voltage adjustment

R2 576 kΩE96-Series LBI input voltage adjustment

R3 1 MΩPullup for the open drain

output LBO

R4 1 MΩPullup for the SNOOZE input

Table 2–1 contains the bill of material of the TPS60210EVM-167. The follow-

ing paragraph describes the use of some of the parts.

R1 and R2 adjust the input voltage of the LBI input for low battery detection.

Theresistive divider on the EVM is connected toVI. For thegiven resistor val-

ues, the LBO signal will go active (low) if VIis below 2.0 V. The divided input

voltage is compared to the internal reference voltage of 1.18 V. C5 works as

afiltercapacitorfortheLBIinputvoltage.Thiscapacitorisrecommendedifline

or load transients occur. At the switching point of the LBI comparator, noise

may trigger the LBI, and this may lead to oscillations at the LBO pin. The LBO

output is an open-drain output and requires an external pullup resistor (R3).

ForR3,avaluebetween100kΩand1MΩisrecommended.Ifyourapplication

does not require low battery detection, these four parts can be omitted. In this

case, connect the LBI-pin to ground.

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