Texas Instruments TPS61020EVM User manual


   
November 2003 Power Management Products
User’s Guide
SLVU100

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 0.9 V to 6 V and output
voltage range of 1.8 V to 5.5 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
60°C. The EVM is designed to operate properly with certain components above 60°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
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About This Manual
This user’s guide describes the operation of the TPS61020EVM low-power,
dc−dc evaluation module (EVM) for a high-efficiency, boost converter. The
guide includes setup instructions for the hardware, a schematic diagram, a bill
of materials (BOM), and PCB layout drawings for the evaluation module.
How to Use This Manual
This document contains the following chapters:
-Chapter 1—Introduction
-Chapter 2—Evaluation with the TPS61020EVM
-Chapter 3—Schematic, BOM, and PCB layout
Related Documentation From Texas Instruments
TPS61020 data sheet (SLVS451)
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
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1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 EVM Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Evaluation With the TPS61020EVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Maximum Output Current 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Enable (EN) Jumper 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Mode Selection Jumper (PS) 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Efficiency of TPS61020EVM 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Schematic, BOM, and PCB Layout 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 HPA025 EVM Schemataic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Bill of Materials 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 PCB Layout of the TPS61020EVM 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−1 Maximum Output Current vs Input Voltage 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−2 Efficiency for 3.3 VOUT 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−1 TPS61020EVM (HPA025) Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−2 Component Placement 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−3 Top Layer 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−4 Bottom Layer 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−1 EVM Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−1 TPS61020EVM (HPA025) Bill of Materials 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
vi

1-1
Introduction
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The Texas Instruments TPS61020 evaluation module (EVM) for low-power,
high-efficiency, boost converter helps designers evaluate the TPS61020
device. The EVM makes it possible to evaluate different device modes as well
as the device performance.
The TPS61020EVM is set to 3.3 V. The TPS61020EVM can be easily set up
to provide any output voltage between 1.8 V and 5.5 V by adjusting the external
resistor divider. Refer to the datasheet (SLVS451) for the output voltage
calculation. The TPS61020 has an input voltage range between 0.9 V and
6.5 V.
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
TPS61020EVM-025 Adjustable output voltage version set to 3.3 V.

2-1
Evaluation With the TPS61020EVM
   !
This chapter details the evaluation process and features of the EVM. For this
purpose, a load is connected to the output pins Vout and GND, allowing the
load current to be adjusted between 0 A and the maximum current shown in
Figure 2−1.
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 Maximum Output Current 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Enable (EN) Jumper 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Mode Selection Jumper (PS) 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Efficiency of TPW61020EVM 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Maximum Output Current
2-2
2.1 Maximum Output Current
Figure 2−1.Maximum Output Current vs Input Voltage
0
200
400
600
800
1000
1200
1400
0.9 1.7 2.5 3.3 4.1
Maximum Output Current − mA
4.9 6.55.7
VI− Input Voltage − V
VO= 3.3 V VO= 5 V
VO= 1.8 V
2.2 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.
2.3 Mode Selection Jumper (PS)
This jumper is used to choose between PWM and PWR SAV modes of
operation. Setting the jumper across PWM forces the device into the low noise
fixed frequency pulse width modulation (PWM) mode. Setting the jumper
across PWR SAV 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.

Efficiency of TPS61020EVM
2-3
Evaluation With the TPS61020EVM
2.4 Efficiency of TPS61020EVM
Figure 2−2.Efficiency for 3.3 VOUT
IL− Load Current − mA
50
55
60
65
70
75
80
85
90
95
100
10 100 200 300 400 500 600 700 800 900
Efficiency
2.4 VI
1.8 VI
0.9 VI
Physically smaller inductors can be used to save board space, or reduce
height at the expense of lower efficiency. Conversely, physically larger induc-
tors give better efficiency.

2-4

3-1
Schematic, BOM, and PCB Layout
"# $%!#  $ &'
This chapter includes the schematic shown in Figure 3−1, bill of materials
table, and layout for the EVM.
Topic Page
3.1 HPA025 EVM Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Bill of Materials 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 PCB Layout of the TPS61020EVM 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3

HPA025 EVM Schemataic
3-2
3.1 HPA025 EVM Schemataic
Figure 3−1 shows the HPA025 EVM schematic diagram. The bill of materials
for the TPS61020EVM is shown in Table 3−1. More details about the design
and component selection for the dc-dc converter can be found in the data
sheet.
Figure 3−1.TPS61020EVM (HPA025) Schematic
LBO
VOUT
9
8+
VIN 1 2
2
J1
J2 1
0.9 − 6.5 V
EN
DISABLE
PWM
PS
PER SAV
JP1
JP2
C1
10 µFR1
0 Ω
R2
1 M Ω
GND
L1
6.2 µHEN
10
7
6
PGND
SW
PS
LBI
VBAT
PwPd
Vout
FB
LBO
GND
U1
TPS61020DRC 1
2
3
4
5R3
1 MΩ
R4
178 kΩ
C2
2.2 µFC3
47 µF
R5
1 MΩ
1
2
J3
GND
1
2
J5
1
2
J4
3.2 Bill of Materials
Table 3−1.TPS61020EVM (HPA025)Bill of Materials
Count Ref Des Description Size MFR Part Number
1 C1 Capacitor, ceramic, 10 µF, 10 V, X5R, ±10% 805 Murata GRM21BR61A106KE19L
1 C2 Capacitor, ceramic, 2.2 µF, 16−V, X5R, ±10% 805 TDK C2012X5R1C225KT
1 C3 Capacitor, tantalum, 47 µF, 16 V, 110 mΩ, 20% 6032 (C) Vishay 594D476X0016C2T
5 J1−J5 Header, 2 pin, 100 mil spacing, (36-pin strip) 0.100 x 2 Sullins PTC36SAAN
2JP1, JP2 Header, 3-pin, 100 mil spacing, (36-pin strip) 0.100 x 3 Sullins PTC36SAAN
1 L1 Inductor, SM Toroid, 6.2 µH, 1.8 A, 43 mΩ74480 Sumida CDRH5D28−6R2
1 R1 Resistor, Chip, 0 Ω, 1/10 W, 1% 805 Std Std
3R2, R3,
R5 Resistor, Chip, 1.00 MΩ, 1/10 W, 1% 805 Std Std
1 R4 Resistor, Chip, 178 kΩ, 1/10 W, 1% 805 Std Std
1 U1 IC, synchronous boost converter, adjustable
voltage DRC10 TI TPS61020DRC
1 — PCB, 1.8 In x 1.5 In x 0.062 In Any HPA025
2 — Shunt, 100 mil, black 0.100 3M 929950−00

PCB Layout of the TPS61020EVM
3-3
Schematic, BOM, and PCB Layout
3.3 PCB Layout of the TPS61020EVM
The figures below show the layout for the EVM.
Figure 3−2.Component Placement
Figure 3−3.Top Layer
Figure 3−4.Bottom Layer

3-4