Texas Instruments TPS6100 EVM Series Manual de usuario

 

May 2000 Power Management Products

User’s Guide

SLVU029

IMPORTANT NOTICE

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How to Use This Manual

iii

Read This First

Preface



About This Manual

This user’s guide describes the evaluation module (EVM) TPS6100x

EVM-156. The TPS6100x family of devices is a single-cell boost converter with

start-up into full load. The TPS6100x family is intended for systems with a

single or dual-battery cell supply and a required output voltage between1.5 V

and 3.3 V.

The guide contains the EVM schematic with an attached bill of material, which

shows the components used with their manufacturers. The layout and the

component placement of the top and bottom side of the board is shown. The

board is assembled on both sides. The following layout considerations point

out the most important layout issues, which must be followed to avoid oscilla-

tions and instability.

The

Setup of the EVM

section describes how to start working with the board.

The next section covers the low-battery feature, which typically works as a bat-

tery supervisor.

How to Use This Manual

This document contains the following chapters:

Chapter 1 – Introduction

Chapter 2 – Schematic and Bill of Material

Chapter 3 – Layout

Chapter 4 – Setup of the EVM

Related Documentation From Texas Instruments

TPS6100x Single-Cell Boost Converter With Start-Up Into Full

Load –

data sheet (literature number SLVS279)

Understanding Boost Power Stages in Switchmode Power Sup-

plies

(literature number SLVA061)

Linear Design Seminar

(literature number SLYD016)

Running Title—Attribute Reference

Contents



1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Schematic and Bill of Material 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Layout 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Top-Side Layout and Component Placement 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Bottom-Side Layout and Component Placement 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Layout Considerations 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Setup of the EVM 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Setup of the EVM 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Low-Battery Function LBI and LBO 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



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

3–1 Topology of a Boost Converter Stage 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1 Setup of the EVM 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–2 Resistive Divider at LBI 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Introduction



The Texas Instruments TPS6100x are low-power single-cell boost converters.

The TPS61002, TPS61003, and TPS61006 are fixed voltage versions with

1.8-V, 2.5-V and 3.3-V output voltage. The TPS61000 can be adjusted with an

external voltage divider to an output voltage between 1.5 V and 3.3 V. Each

of these four versions is supported with its own EVM. The EVM with the adjust-

able output voltage version is adjusted to 3.3-V output voltage.

The maximum output current at an input voltage down to 0.8 V (single battery-

cell supply) is 100 mA. If two battery cells are used as supply, output currents

up to 200 mA can be drawn at an input voltage down to 1.6 V. The device can

be started into a full load with supply voltages down to 0.9 V over the full tem-

perature range.

The high power conversion efficiency of up to 90%, a low quiescent current of

less than 50 µA, and a special power-save mode makes this family of devices

well-suited for battery-powered applications. These EVMs should help to eval-

uate the device directly in the application.

The board can be used, for example, to measure the efficiency of different ex-

ternal components and determine the best for the application. The ripple of the

output voltage be can easily measured, depending on the output capacitor

used. The board is assembled with a 22-µF multilayer ceramic output capaci-

tor from Taiyo Yuden, which has an ultralow ESR to keep the output ripple as

low as possible.

If another fixed-voltage version is of interest, the assembled device can be re-

placed with the desired device. Other fixed voltage versions are TPS61001,

TPS61004, and TPS61005 with 1.5-V, 2.8-V and 3-V output voltage. Free

samples can be ordered from http://www.ti.com. Type in the complete device

name in the

quick search

box and select

Check stock or order

under

Availabil-

ity/Samples

To get more detailed information about the device, see the TPS6100x data

sheet (literature number SLVS279).

Chapter 1

1-2

2-1

Schematic and Bill of Material

    

Figure 2–1.Schematic of the EVM

COMP

GND

LBO

LBI

SWITCH

VBAT

R6 LP1

OUT

J1 J2

C1 C3

R2 R1

Chapter 2

2-2

Table 2–1.Bill of Material

Component Value Functionality

IC1 Texas Instruments:

TPS6100x

10-pin MSOP package

Controller-IC in the boost-converter stage

10 µH,

Coilcraft: DS1608C-103 Inductor for storing energy during on-state of the power transistor

Motorola:

MBRM120LT3 Schottky diode for rectifying current flow, works as a free-wheeling

diode

R1 1 MΩ, 1% Resistor to adjust the threshold voltage, supervised by the

low-battery function

R2 909 kΩ, 1% Resistor to adjust the threshold voltage, supervised by the

low-battery function

R3 178 kΩ, 1%

(only TPS61000-ADA) Resistor to adjust the output voltage for the adjustable version

R4 1 MΩ, 1%

(only TPS61000-ADA) Resistor to adjust the output voltage at the adjustable version

R5 33 kΩ, 5% Resistor to compensate the control loop

R6 470 kΩ, 5% Pullup resistor for the open-drain output of the low-battery output

C1 10 µF, Taiyo Yuden:

JMK316BJ106ML-T Input capacitor to stabilize input voltage

C2 22 µF, Taiyo Yuden:

LMK432BJ226MM-T Output capacitor to supply the load during on state of the power

transistor

C3 100 nF, 10 V Input capacitor for filtering spikes

C5 10 nF, 10 V Capacitor to compensate the control loop

C6 47 pF, 10 V Capacitor to compensate the control loop

J1 3-pin To enable (connect to VBATT) or disable (to GND) the device

J2 3-pin Not used for this family of devices

IN 4-pin To connect the device to the battery and GND →Input

OUT 4-pin To connect the device to the load and GND →Output

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