Texas Instruments TPS6110XEVM-216 User manual

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November 2002 Power Management Products
User’s Guide
SLVU078

IMPORTANT NOTICE
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TI assumes no liability for applications assistance or customer product design. Customers are responsible for
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Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2002, Texas Instruments Incorporated

EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
Thisevaluationkit being soldbyTI is intendedforuse 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.
ShouldthisevaluationkitnotmeetthespecificationsindicatedintheEVMUser’sGuide,thekitmaybereturned
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,ORSTATUTORY,INCLUDINGANYWARRANTY OF MERCHANTABILITY ORFITNESSFORANY
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
receivedmaynotberegulatorycompliant oragency certified (FCC,UL, CE,etc.). Dueto theopen construction
oftheproduct,itistheuser’sresponsibilitytotakeanyandallappropriateprecautionswithregardtoelectrostatic
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’sGuidepriortohandlingtheproduct.Thisnoticecontainsimportantsafetyinformationabouttemperatures
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 2002, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
ItisimportanttooperatethisEVMwithinthe inputvoltage rangeof 0V to3.6Vandtheoutput
voltage range of 1.5 V to 5.5 V at the dc-dc output and 0.9 V to 3.6 V at the LDO output.
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.
Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/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.
Duringnormaloperation,somecircuitcomponentsmayhavecasetemperaturesgreaterthan
100°C. The EVM is designed to operate properly with certain components above 100°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
EVMUser’sGuide.Whenplacingmeasurementprobesnearthesedevices duringoperation,
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 2002, Texas Instruments Incorporated

Contents
v
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Setup of the EVMs 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Evaluation With the TPS6110x EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.1 Enable (EN) and Enable Pushbutton (ENPB) Jumper 2-2. . . . . . . . . . . . . . . . . . . .
2.1.2 LDO Enable (LDOEN) Jumper 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.3 Auto Discharge Enable (ADEN) Jumper 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.4 Power Save Mode Enable (SKIPEN) Jumper 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.5 LBI/LBO Comparator 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.6 Power Good Ooutput 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Bill of Materials, PCB Layout and Schematic 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Bill of Materials 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 PCB Layout 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Schematic 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures
3–1 Component Placement 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–2 Top Layer 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–3 Bottom Layer 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–4 TPS6110x EVM Circuit Diagram 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
1–1 Orderable EVM’s 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 Bill of Materials 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
vi

1-1
Introduction
TheTexasInstrumentsTPS61100toTPS61107evaluationmodules(EVM)for
high-efficiency boost converters help designers to evaluate the different
operatingmodesandtheperformanceofthedevice.RefertoTable 1–1 forthe
various EVMs available in this family.
If any other output voltage configuration is to be evaluated, the TPS61100
adjustable output voltage version can be set up to provide an output voltage
between 1.5 V and 5.5 V at the output of the boost converter and between 0.9
V and 3.3 V at the LDO. Only the appropriate feedback resistor divider has to
be adjusted. Also, other fixed output voltage versions of the devices can be
easily evaluated using the EVM. Refer to the data sheet (SLVS411) for the
various fixed output voltage options available in the TPS6110x device family.
TheTPS6110xhasaninputvoltagerangebetween0.9Vand3.6V.Forproper
operation the maximum input voltage should not exceed the output voltage.
The maximum output current is at least 100 mA depending on the input
voltage.
Table 1–1.Orderable EVM’s
EVM Number Description
TPS61100EVM-216 Adjustableboostoutputvoltage,setto3.3V Adjustable LDO output voltage, set to 1.5 V
TPS61103EVM-216 Boost output voltage fixed at 3.3 V Adjustable LDO output voltage, set to 1.5 V
TPS61106EVM-216 Boost output voltage fixed at 3.3 V LDO output voltage fixed at 1.5 V
TPS61107EVM-216 Boost output voltage fixed at 3.3 V LDO output voltage fixed at 1.8 V
Chapter 1

1-2

2-1
Setup of the EVMs
Setup of the EVMs
Itis important to establishallconnectionstothe EVM before the powersupply
for the EVM is turned on.
-Connect a power supply (0.9 V to VOUT, depending on the output voltage
of the EVM) to the INPUT header
-Connect a voltmeter to the OUTPUT header
-Verify that all jumper s are set to their desired value (EN, ENPB, SKIPEN,
ADEN, LDOEN). Default setting is EN, SKIPEN, ADEN and LDOEN to
VBAT and ENPB to GND.
-Turn on the power supply and verify the output voltage
Topic Page
2.1 Evaluation With the TPS6110x EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Evaluation With the TPS6110x EVM
2-2
2.1 Evaluation With the TPS6110x EVM
This chapter details the evaluation process and features of the EVM. For this
evaluation,aloadisconnectedtotheoutputterminalinordertoadjusttheload
current between 0 mA and 250 mA.
For accurate output voltage and input voltage measurements, it is important
to measure the voltage on the input and output voltage terminals with Kelvin
contacts or with a voltmeter connected directly to the input voltage or output
voltage terminals. This will eliminate any measurement errors related to
voltage drops along the input and output terminal wires connected to the
power supply or load.
2.1.1 Enable (EN) and Enable Pushbutton (ENPB) Jumper
Thesejumpersareused toenablethedevice.Connecting theenablepin(EN)
toVBATorconnectingtheenablepushbutton(ENPB)toGNDenablesthepart.
The device is only disabled when ENPB is set to VBAT and EN is set to GND.
Bothenable pins are usedtoimplementenablewith a pushbutton andastatic
signal for example from a microcontroller. For more details refer to the data
sheet.
2.1.2 LDO Enable (LDOEN) Jumper
This jumper is used to enable the integrated LDO of the device. Connecting
the LDO enable pin (LDOEN) to VBAT enables the LDO section of the part.
Disabling the integrated LDO can be done by setting this jumper to GND.
2.1.3 Auto Discharge Enable (ADEN) Jumper
This jumper enables the device to discharge the output capacitor after the
deviceisdisabledbysettingENtoGND.IfADENissettoVBAT,thecapacitors
connected to VOUT is discharged by an internal switch with a resistance of
about400Ω.Thedischargetimedependsonthetotaloutputcapacitance.The
residual output voltage is less than 0.4V after auto discharge.
When disabling the auto discharge function by setting the jumper to GND, the
output capacitors will only be discharged by the load and/or by the leakage
currents in every connected part.
2.1.4 Power Save Mode Enable (SKIPEN) Jumper
Thisjumperenablesthedevicetoenterinpowersavemodeatlightload,when
it is set to VBAT. The device automatically stops switching when the output
voltage reached its upper threshold, and starts switching again, when the
lower threshold of the output voltage is reached.
When disabling the power save function by setting the jumper to GND, the
devicestaysoperatinginfixed frequency mode,regardlessoftheloadcurrent
value. In this mode, however reverse current will flow back to the input during
light load operation increasing power losses. The operating frequency stays
constant, which implies low output voltage ripple.

Evaluation With the TPS6110x EVM
2-3
Setup of the EVMs
2.1.5 LBI/LBO Comparator
The LBO1 and LBO2 terminals are open drain outputs and have pullup
resistors, R7 and R8, connected to the output. The signal on these pins can
go low as soon as the input voltage at LBI falls below the threshold of 500 mV.
Refertothemoredetaileddescriptionandthetruthtableinthedatasheet.Both
LBO outputs stay at high-impedance when the input voltage at LBI is above
the appropriate thresholds. A resistor divider (R1, R2) is used on the EVM to
monitor the supply voltage.
More details about setting the low battery threshold voltage can be found in
the data sheet (literature number SLVS411).
2.1.6 Power Good Output
ThePGpinisanopendrainoutputwithapullupresistor,R9,connectedtothe
output.Thesignalonthispingoeshighassoonastheoutputvoltageisgreater
than typically 92% of the nominal voltage. The signal goes low as soon as the
outputvoltagefallsbelowthistypicalthreshold.Thereisanimplementeddelay
time of 30 µs to prevent the power good output from ringing.

2-4

3-1
Bill of Materials, PCB Layout and Schematic
Bill of Materials, PCB Layout and Schematic
Thischaptercontainsbill ofmaterials,PCBlayoutoftheEVM,andschematic.
Topic Page
3.1 Bill of Materials 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 PCB Layout 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Schematic 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3

Bill of Materials
3-2
3.1 Bill of Materials
The bill of materials for the TPS6110x EVM is shown in Table 3–1 with
adjustable and fixed output voltage versions.
Moredetailsaboutthedesignandcomponentselectionforthedc-dcconverter
can be found in the data sheet.
Table 3–1.Bill of Materials
Reference Description Manufacturer Comments
C4 100 µF 10 V, Low ESR Tantalum size D Vishay Vishay 591D–107X0010U2T
C3 10 µF X5R 6.3 V, capacitor SMD1206 TDK TDK C3216X5R0J106M
C5, C6 2.2 µF X5R 6.3 V, capacitor SMD0805 TDK TDK C2012X5R1A225M
L1 10 µH, WE-PD Type S Wurth
Elektronik Wurth Elektronik: 744 778 10 Also possible: Sumida CDRH73-100
or Coiltronics DR73-100
R10 0 Ω, resistor SMD0805
R4 180 kΩ,1%, resistor SMD0805 TPS61100EVM and TPS61103EVM
R6 180 kΩ,1%, resistor SMD0805 TPS61100EVM
R3 1 MΩ,1%, resistor SMD0805 TPS61100EVM
R7, R8, R9 1 MΩ, 1%, resistor SMD0805
R1 390 kΩ, 1%, resistor SMD0805
R5 390 kΩ, 1%, resistor SMD0805 TPS61100EVM and TPS61103EVM
R5 0 Ω, resistor SMD0805 TPS61106EVM and TPS61107EVM
R2 470 kΩ, 1%, resistor SMD0805
R11 Not assembled
LDOOUT Header 1×4, 0.1Ipitch
OUTPUT Header 1×4, 0.1Ipitch
INPUT Header 1×4, 0.1Ipitch
J6 Header 1×3, 0.1Ipitch
EN Header 1×3, 0.1Ipitch With Jumper set to VBAT
ENPB Header 1×3, 0.1Ipitch With Jumper set to GND
LDOEN Header 1×3, 0.1Ipitch With Jumper set to VBAT
ADEN Header 1×3, 0.1Ipitch With Jumper set to VBAT
SKIPEN Header 1×3, 0.1Ipitch With Jumper set to VBAT
GND Header 1×2, 0.1Ipitch
U1 TPS61100PW, RGE24 TI TPS61100EVM-216
TPS61103PW, RGE24 TI TPS61103EVM-216
TPS61106PW, RGE24 TI TPS61106EVM-216
TPS61107PW, RGE24 TI TPS61107EVM-216

PCB Layout
3-3
Bill of Materials, PCB Layout and Schematic
3.2 PCB Layout
As for all switch mode power supplies the PCB layout is a critical step in the
power supply design process. The figures below show the layout for the
adjustable and fixed output voltage EVMs. Please refer to the data sheet for
further layout guidelines. The required board area for the complete dc-to-dc
converter solution takes up less than 320 mm2(16 mm ×20 mm) on a double
sided PCB, as it is indicated by the rectangular on the component placement
plot.
Figure 3–1.Component Placement
Figure 3–2.Top Layer

Schematic
3-4
Figure 3–3.Bottom Layer
3.3 Schematic
Figure 3–4.TPS6110x EVM Circuit Diagram
R7
TPS6110xRGE
OUTPUT
GND
VBAT
LBI
ADEN
EN
SWN
ENPB
ENLDO
SKIPEN
VOUT
LDOIN
FB
LDOOUT
PGOOD
LBO1
LBO2
SWP
LDOSENSE
PGND
C6C4
C5
R8R9
U1
R1
R2
C3
L1
10µF
10µH
2.2µF100µF
2.2µF
LBO1
LBO2
PGOOD
INPUT
SKIPEN
ADEN
EN
ENPB
ENLDO
R11
R10
R6
R3
R5
R4
LDOOUT