Texas Instruments TPS6204xEVM User manual


    !!"
July 2003 PMP Portable Power
User’s Guide
SLVU089

IMPORTANT NOTICE
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Mailing Address: Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated

EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned
within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE
WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,
IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any
machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 2.5 V to 6 V and the output
voltage range of 0.7 V and 6 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI
field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
xxx°C. The EVM is designed to operate properly with certain components above xxx°C as
long as the input and output ranges are maintained. These components include but are not
limited to linear regulators, switching transistors, pass transistors, and current sense
resistors. These types of devices can be identified using the EVM schematic located in the
EVM User’s Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated

Related Documentation From Texas Instruments
iii
Preface

About This Manual
This user’s guide describes the operation of the TPS6204xEVM low-power dc-
dc evaluation module for high-efficiency, step-down converters.
How to Use This Manual
This document contains the following chapters:
-Chapter 1—Introduction
-Chapter 2—Evaluation With the TPS6204xEVM
-Chapter 3—PCB Layout, BOM, and Schematic
Related Documentation From Texas Instruments
-TPS6204x data sheet (SLVS463)
FCC Warning
This equipment is intended for use in a laboratory test environment only. It gen-
erates, uses, and can radiate radio frequency energy and has not been tested
for compliance with the limits of computing devices pursuant to subpart J of
part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other en-
vironments may cause interference with radio communications, in which case
the user at his own expense will be required to take whatever measures may
be required to correct this interference.

iv

Contents
v

1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 EVM Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Evaluation With the TPS6204xEVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Enable (EN) Jumper 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Mode Selection Jumper 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 PCB Layout, BOM, and Schematic 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 SLVP229EVM Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 TPS62040 and TPS62046 EVMs (SLVP229) Bill of Materials 3-3. . . . . . . . . . . . . . . . . . . . .
3.3 PCB Layout of the TPS62040EVM and TPS62046EVM 3-4. . . . . . . . . . . . . . . . . . . . . . . . . .

3−1 TPS62040EVM and TPS62046EVM (SLVP229) Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . .
3−2 Component Placement 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−3 Top Layer 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−4 Bottom Layer 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−1 EVM Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−1 TPS62040EVM and TPS62046EVM (SLVP229) Bill of Materials 3-3. . . . . . . . . . . . . . . . . . . .

vi

1-1
Introduction

The Texas Instruments TPS62040 and TPS62046 evaluation modules (EVM)
for low-power, high-efficiency, step-down converters help designers evaluate
these devices. The EVMs make it possible to evaluate different modes of the
devices as well as the device performance.
The TPS6204xEVMs are available as the TPS62040 adjustable version set
to 1.8 V and the TPS62046 3.3-V fixed version.
The TPS62040EVM is easily set up to provide any output voltage between
0.7 V to 6 V (or VI) by adjusting the external resistor divider. Refer to the data
sheet (SLVS463) for various fixed voltage options available for the TPS6204x.
The TPS6204x has an input voltage range between 2.5 V and 6 V with an
output current up to 1.2 A.
Any version of the TPS6204x is evaluated by removing and replacing the IC
on the EVM.
Topic Page
1.1 EVM Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

EVM Ordering Information
1-2
1.1 EVM Ordering Information
Table 1−1.EVM Ordering Information
EVM Number Description
TPS62040EVM−229 Adjustable output voltage version set to 1.8 V
TPS62046EVM−229 3.3-V fixed output voltage version

2-1
Evaluation With the TPS6204xEVM
   !"
This chapter details the evaluation process and features of the EVM. For this
purpose, a load is connected to the output pins VOand GND, which allows the
load current to be adjusted between 0 A and 1.2 A.
For accurate output voltage and input voltage measurements, it is important
to measure the voltage on the input and output voltage terminals with a
voltmeter connected directly to the input voltage or output voltage terminals.
This eliminates any measurement errors related to voltage drops along the
input and output terminal wires connected to the power supply or load.
Topic Page
2.1 Enable (EN) Jumper 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Mode Selection Jumper 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Enable (EN) Jumper
2-2
2.1 Enable (EN) Jumper
This jumper is used to enable the device. Connecting the EN pin to ENABLE
enables the part. Connecting the EN pin to DISABLE disables the device.
2.2 Mode Selection Jumper
This jumper is used to choose between PWM and PFM/PWM modes of
operation. Setting the jumper across FIXED FREQ forces the device into the
low noise fixed frequency pulse width modulation (PWM) mode. Setting the
jumper across PWR SAVE enables the power save mode where the device
enters a pulse frequency modulation mode (PFM) at light to medium load
currents, which reduces quiescent current and switching frequency to a
minimum to achieve highest efficiency over the entire load current range.

3-1
PCB Layout, BOM, and Schematic
# $%& #'"&  (
As for all switch mode power supplies, the PCB layout is a very important step
in the power supply design process. The following figures show the layout for
the adjustable and fixed output voltage EVMs. A bill of materials and a
schematic are provided.
Topic Page
3.1 SLVP229 EVM Schematic 3-2
3.2 BIll of Materials 3-3
3.3 PCB Layout of the TPS62040EVM and TPS62046EVM 3-4
Chapter 3

SLVP229EVM Schematic
3-2
3.1 SLVP229EVM Schematic
Figure 3−1 shows the SLVP229 EVM schematic diagram. The bill of materials
for the TPS62040EVM and TPS62046EVM is shown in Table 3−1. More
details about the design and component selection for the dc-dc converter are
found in the data sheet.
Figure 3−1.TPS62040EVM and TPS62046EVM (SLVP229) Schematic
J1
FB
1
2
3
4
5
10
9
8
7
6
11
JP2
JP11 1
2
1
2
J1
VIN
GND
C3
22 µFEN
VIN
PWP
AGND
VIN
PGND
PGND
SW
SW
MOD
U1
TPS6204xDGQ
L1
6.2 µH
R1
R2
C4
22 µF
C1
C2
J3
1
2
J4
1
2
VOUT
GND
See BOM for Values
1

TPS62040EVM and TPS62046EVM (SLVP229) Bill of Materials
3-3
PCB Layout, BOM, and Schematic
3.2 TPS62040EVM and TPS62046EVM (SLVP229) Bill of Materials
Table 3−1.TPS62040EVM and TPS62046EVM (SLVP229) Bill of Materials
QUANTITY
Ref
DESCRIPTION
SIZE
MFR
PART NUMBER
TPS62040 TPS62046
Ref
Des DESCRIPTION SIZE MFR PART NUMBER
2 2 C3,
C4 Capacitor, ceramic, 22 µF, 6.3 V, X5R, 10% 1210 Murata GRM32DR60J226KA01
1
C1
Capacitor, ceramic, 33−pF, 50 V,
C0G, 5% 805 Murata GRM2165C1H330JZ01
Open
C1
Capacitor, ceramic, xxx µF, vv−V 805
1
C2
Capacitor, ceramic, 120 pF, 50 V,
C0G, 5% 805 Murata GRM2165C1H121JZ01
Open
C2
Capacitor, ceramic, xxx µF, vv−V 805
4 4 J1−J4 Header, 2 pin, 100 mil spacing,
(36-=pin strip) 0.100 ×2 Sullins PTC36SAAN
2 2 JP1,
JP2 Header, 3 pin, 100 mil spacing, (36-pin strip) 0.100 ×3 Sullins PTC36SAAN
1 1 L1 Inductor, SM toroid, 6.2 µH,
1.8 A, 45 mΩ
0.224 Sumida CDRH5D28−6R2
1
R1
Resistor, chip, 475 kΩ, 1/10−W, 1% 805 Std Std
1R1 Resistor, chip, 0 Ω, 1/10 W, 5% 805 Std Std
1
R2
Resistor, chip, 182 kΩ, 1/10 W, 1% 805 Std Std
Open R2 Resistor, chip, xx Ω,, 1/10 W, 1% 805 Std Std
1
U1
IC, high-effficiency step-down dc-dc
converter, adj V DGS10 TI TPS62040DGQ
1U1 IC, high-effficiency step-down dc-dc
converter, 3.3 V DGS10 TI TPS62046DGQ
1 1 −− PCB, 1.75 In ×1 In ×0.062 In Any SLVP229
2 2 −− Shunt, 100 mil, black 0.100 3M 929950−00

PCB Layout of the TPS62040EVM and TPS62046EVM
3-4
3.3 PCB Layout of the TPS62040EVM and TPS62046EVM
Figure 3−2, Figure 3−3, and Figure 3−4 show the layout for the adjustable and
fixed output voltage EVMs.
Figure 3−2.Component Placement
Figure 3−3.Top Layer
Figure 3−4.Bottom Layer