User's Guide
SLVU455A – April 2011 – Revised August 2012
TPS62730, TPS62733 Stepdown Converters With Bypass
Mode for Ultralow-Power Wireless Applications
This user’s guide describes the TPS62730 and TPS62733 evaluation module (EVM), how to perform a
stand-alone evaluation or interface with a host or system. The design of the converter is for delivery of up
to 100 mA of continuous current to the output. One can switch the converter into bypass mode by
grounding the ON/BYP pin, or the device switches automatically with the input voltage falling to the output
regulation voltage. The TPS62730 and TPS62733 have a fixed (regulated) output voltage of 2.1 V and
2.3 V, respectively.
1
2
3
4
5
6
Contents
Introduction ..................................................................................................................
Considerations With Evaluating the TPS62730 and TPS62733 ......................................................
Performance Specification Summary .....................................................................................
Test Summary ...............................................................................................................
4.1
Equipment ...........................................................................................................
4.2
Equipment and EVM Setup .......................................................................................
4.3
Test Procedure .....................................................................................................
Schematic, Physical Layouts and Bill of Materials .....................................................................
5.1
Schematic ...........................................................................................................
5.2
Physical Layouts ...................................................................................................
5.3
Bill of Materials .....................................................................................................
Oscilloscope Traces (taken on the TPS62730EVM-726) ..............................................................
2
2
2
2
3
3
4
5
5
5
7
7
List of Figures
1
EVM Schematic and Evaluation Setup ................................................................................... 3
2
TPS62730 and TPS62733 EVM Board Schematic ..................................................................... 5
3
Assembly Layer ............................................................................................................. 5
4
Top Layer .................................................................................................................... 6
5
Bottom Layer
6
CH1: Phase; CH2: Output Ripple, Vin = 3.3 V, and 21-Ω Load ...................................................... 7
7
PFM Mode at Low Load, 40 mA – CH1: Phase; CH2: Output Ripple; 0.2 µs/div .................................. 8
8
PFM Mode at Low Load, 11 mA – CH1: Phase; CH2: Output Ripple; 1 µs/div
9
Transition From Switching Converter to Bypass Mode by Removing Input Power – CH1: Phase Node;
CH2: STAT Pin .............................................................................................................. 9
10
Transition From Converter Switch Mode to Bypass Mode by Pulling ON/BYP Pin Low .......................... 9
11
Transition From Bypass Mode to Converter Switch Mode by Pulling ON/BYP Pin High ........................ 10
12
Start-Up by Hot-Plugging the Input Power Source .................................................................... 10
13
Transient Output Load Step From 50 mA to 100 mA ................................................................. 11
14
Transient Output Load Step From 100 mA to 50 mA ................................................................. 11
................................................................................................................
SLVU455A – April 2011 – Revised August 2012
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8
1
Introduction
1
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Introduction
The TPS62730 and TPS62733 devices are high-frequency synchronous stepdown dc-dc converters
optimized for ultralow-power wireless applications. The devices are optimized to supply TI’s low-power
wireless sub-1-GHz and 2.4-GHz RF transceivers. The TPS62730 and TPS62733 reduce the current
consumption drawn from the battery during TX and RX modes by a highly efficient stepdown voltage
conversion. They provide up to 100-mA output current and allow the use of tiny and low-cost chip
inductors and capacitors. This devices support most Li-ion primary battery chemistries, with an input range
of 1.9 V to 3.9 V dc.
The TPS62730 and TPS62733 feature an ultralow-power bypass mode with a typical 30-nA current
consumption to support low-power modes of modern RF transceivers. In this bypass mode, the input is
connected to the VOUT pin via an internal 2-Ω bypass FET.
The devices automatically enter bypass mode when the input (battery) voltage falls to the bypass
transition threshold.
2
Considerations With Evaluating the TPS62730 and TPS62733
This part has two modes of operation, the switching buck mode and the dc bypass mode. The IC
automatically shuts down the switcher once the input voltage drops to the bypass threshold, which is a few
millivolts above the regulation voltage. This saves bias power to the switcher.
The user can implement bypass mode at higher input voltages by pulling the ON/BYP pin low. There may
be some applications where the input voltage is too high for the system; exercise caution not to perform
this mode transfer for these cases. Do not leave the ON/BYP pin floating (open), or the IC may be in an
unknown state or mode, and the output voltage may be anywhere between the input voltage and the
regulation voltage.
The EVM has a pullup resistor on the ON/BYP pin to Vin so that it stays in the switching mode if the
jumper is removed and only goes into the bypass mode if the shunt is moved to ground the ON/BYP pin.
This pullup resistor on the EVM loads the input, when in bypass mode, by Vin / 1 MΩ. In a typical
application, a driver controls the ON/BYP pin and does not load the input; thus, do not consider this
current in the quiescent current when in bypass mode.
Also consider (ignore) the pullup resistor for the status output on the EVM when calculating the efficiency
of the converter. The EVM uses a stiff pullup, because loads that may be connected to the STAT pin are
not known. When designing the system, a much higher-value resistor may be appropriate.
3
Performance Specification Summary
SPECIFICATION
TEST CONDITIONS
MIN
Input dc voltage, Vin
Output dc voltage, Vout
TPS62730EVM-726, ON/BYP = HIGH and Vin > VIT BYP
Output dc voltage, Vout
TPS62733EVM-726, ON/BYP = HIGH and Vin > VIT BYP
Output current
4
TYP
1.9
MAX
3.9
2.1
V
V
2.3
0
UNIT
V
100
mA
Test Summary
The TPS62730EVM-726 and TPS62733EVM-726 boards require an adjustable 4-V, ≥150-mA currentlimited power source to provide input power and a resistive load between 100 Ω and 21 Ω. The test-setup
connections and jumper-setting selections are configured for a stand-alone evaluation, but can be
changed to interface with external hardware such as a system load and microcontroller.
2
TPS62730, TPS62733 Stepdown Converters With Bypass Mode for UltralowPower Wireless Applications
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Test Summary
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4.1
Equipment
•
•
•
•
4.2
Adjustable dc power supply between 1.8 V and 4 V with adjustable current limit set to approximately
150 mA
Load: system load or resistive load ≥ 21 Ω
Three Fluke 75 DMMs (equivalent or better)
Oscilloscope, model TDS222 (equivalent or better)
Equipment and EVM Setup
Table 1. Setup I/O Connections and Configuration for Evaluation of TPS62730, TPS62733 EVM
Jack and Component (Silk
Screen)
Connect or Adjustment To:
J1 (Vin)
Power supply positive lead, preset to 3.3 VDC, 150-mA current limit
J2-1 (+ SNS); input
Positive lead of DMM #1
J2-2 (- SNS); input
Negative lead of DMM #1
J3 (GND)
Power supply negative lead (3.3 VDC supply)
J4 (Vout)
Positive lead to system load or load resistance
J5-1 (+ SNS); output
Positive lead of DMM #2
J5-2 (- SNS); output
Negative lead of DMM #2
J6 (GND)
Negative lead to system load or load resistance
J7-1 (STAT)
Positive lead of DMM meter #3
J7-2 (GND)
Negative lead of DMM meter #3
JP1 (ON)
Apply shunt to ON (across pins 1 and 2) for converter operation
JP1 (Bypass)
Do not apply shunt to Bypass (across pins 2 and 3) until procedure calls for change.
Connect the meters, scope probes, output load, shunt, and input power supply as listed in Table 1 and set
the oscilloscope to 200 ns/div, positive trigger, dc-coupled on CH1, ac-coupled and 10 mV/div on CH2.
Use additional channels or move probes as required view Vin, Vstat and Vbypass. Replace the resistive
load with a system load or decade load box if desired to vary the load between 1 kΩ and 21 Ω.
Vout 2.1 V or 2.3 V
S001
Figure 1. EVM Schematic and Evaluation Setup
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Test Summary
4.3
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Test Procedure
1. Make sure that the EVM setup is according to Table 1 and Figure 1, and preset the power supply to
3.3 VDC at a current limit of approximately 150 mA.
2. Turn on the input supply and verify the input voltage is approximately 3.3 VDC (DMM 1) and the output
voltage is at approximately 2.1 or 2.3 VDC for TPS62730 or TPS62733, respectively (DMM 2).
3. Look at CH1 and CH2 and verify that the duty cycle is near 70% and the ripple is less than 10-mV
ripple; see Figure 6 for typical waveforms.
4. Vary the load between 0 and 100 mA [1 kΩ to 21 Ω (TPS62730) or 1 kΩ to 23 Ω (TPS62733)].
Observe the change in the switching waveform from PFM with discontinuous ringing to PWM mode. It
may be necessary to change the time scale on the scope to 1 µs/div for light loads. See Figure 7 and
Figure 8 for various loads. Set the load back to approximately 21 Ω.
5. Vary the input voltage from 3.3 VDC to 3.9 VDC and back to 2.4 VDC to see the change in duty cycle.
6. Reduce the input voltage from 2.4 VDC to 1.9 VDC and verify that the switcher automatically goes into
bypass mode, disabling the switcher and turning on the internal bypass FET. The output should be the
input voltage minus the IR drop across the pass FET (approximately 2 Ω). The STAT pin should go to
the high-impedance state with R1 pulling it to the output voltage. Conditions for the capture of Figure 9
were: CH2 moved to the J7 (STAT) header relative to ground, 1 V/div, dc-coupled, the time scale set
to 50 µs/div (a slower time scale may be required, depending on power-supply decay), singlesequence trigger on CH2, and input power removed. The figure shows the switch node going into
PFM, then disabling switching, and then indicating bypass mode by R1 pulling the STAT pin up to the
output voltage (approximately 2.2 VDC).
CAUTION
The following step disables the buck converter and switches the input voltage
to the output. Make sure not to exceed the maximum system input voltage in
this step or the later steps that place the JP1 shunt in the bypass position.
7. Move the shunt on jumper JP1 from the ON position to the Bypass position. Notice that this action
disables the switcher and switches the input voltage to the output via the bypass switch. The output
should be the input voltage minus the IR drop across the pass FET (approximately 2 Ω). The STAT pin
should go to the high-impedance state with R1 pulling it to the output voltage. Move the shunt on
jumper JP1 to the ON position.
8. For steps 9 through 13, one can view the figure and determine the oscilloscope setup.
9. See Figure 10 for the transition from converter switch mode to bypass mode by pulling the ON/BYP pin
low.
10. Remove the bypass jumper to see the transition from bypass mode to converter switch mode; see
Figure 11.
11. See Figure 12 for typical hot-plug power up.
12. See Figure 13 for the transient output-load step from 50 mA to 100 mA.
13. See Figure 14 for the transient output-load step from 100 mA to 50 mA.
4
TPS62730, TPS62733 Stepdown Converters With Bypass Mode for UltralowPower Wireless Applications
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Schematic, Physical Layouts and Bill of Materials
www.ti.com
5
Schematic, Physical Layouts and Bill of Materials
5.1
Schematic
S002
Figure 2. TPS62730 and TPS62733 EVM Board Schematic
5.2
Physical Layouts
TEXAS
I NSTRUMENTS
K001
Figure 3. Assembly Layer
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Schematic, Physical Layouts and Bill of Materials
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K002
Figure 4. Top Layer
K003
Figure 5. Bottom Layer
6
TPS62730, TPS62733 Stepdown Converters With Bypass Mode for UltralowPower Wireless Applications
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Oscilloscope Traces (taken on the TPS62730EVM-726)
www.ti.com
5.3
Bill of Materials
Table 2. HPA726 Bill of Materials
COUNT
RefDes
Value
Description
Size
Part Number
MFR
2
C1, C2
2.2 µF
Capacitor, Ceramic, 6.3V, X5R, 20%
0402
GRM155R60J225ME15D
muRata
0
C4
Open
Capacitor, Ceramic, 6.3V, X5R, 20%
0603
Std
Std
1
1
C3
22 µF
Capacitor, Ceramic, 16V, X5R, 20%
1206
GRM31CR61C226ME15L
muRata
1
1
L1
2.2 µH
Inductor, SMT, 0.8A, 0.23 ohm
0805
LQM21PN2R2NGC
MuRata
1
1
R1
10 kΩ
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
1
R2
1 MΩ
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
0
U1
TPS62730DRY
IC, Step Down Converter with Bypass
Mode for Low Power Wireless, 2.1V
Output
1,5 mm × 1 mm
TPS62730DRY
TI
0
1
U1
TPS62733DRY
IC, Step Down Converter with Bypass
Mode for Low Power Wireless, 2.3V
Output
1,5 mm × 1 mm
TPS62733DRY
TI
-001
-002
2
0
6
Oscilloscope Traces (taken on the TPS62730EVM-726)
G001
Figure 6. CH1: Phase; CH2: Output Ripple, Vin = 3.3 V, and 21-Ω Load
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Oscilloscope Traces (taken on the TPS62730EVM-726)
www.ti.com
G002
Figure 7. PFM Mode at Low Load, 40 mA – CH1: Phase; CH2: Output Ripple; 0.2 µs/div
G003
Figure 8. PFM Mode at Low Load, 11 mA – CH1: Phase; CH2: Output Ripple; 1 µs/div
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Oscilloscope Traces (taken on the TPS62730EVM-726)
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G004
Figure 9. Transition From Switching Converter to Bypass Mode by Removing Input Power – CH1: Phase
Node; CH2: STAT Pin
G005
Figure 10. Transition From Converter Switch Mode to Bypass Mode by Pulling ON/BYP Pin Low
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Oscilloscope Traces (taken on the TPS62730EVM-726)
www.ti.com
G006
Figure 11. Transition From Bypass Mode to Converter Switch Mode by Pulling ON/BYP Pin High
G007
Figure 12. Start-Up by Hot-Plugging the Input Power Source
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TPS62730, TPS62733 Stepdown Converters With Bypass Mode for UltralowPower Wireless Applications
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Oscilloscope Traces (taken on the TPS62730EVM-726)
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G008
Figure 13. Transient Output Load Step From 50 mA to 100 mA
G009
Figure 14. Transient Output Load Step From 100 mA to 50 mA
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS
Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:
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.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
the date of delivery for a full refund. THE FOREGOING LIMITED 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. 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.
Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This
notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety
programs, please visit www.ti.com/esh or contact TI.
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. 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.
REGULATORY COMPLIANCE INFORMATION
As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal
Communications Commission (FCC) and Industry Canada (IC) rules.
For EVMs not subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT,
DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer
use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing
devices pursuant to part 15 of FCC or ICES-003 rules, which are designed to provide reasonable protection against radio frequency
interference. Operation of the equipment 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.
General Statement for EVMs including a radio
User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and
power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local
laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this
radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and
unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory
authorities, which is responsibility of user including its acceptable authorization.
For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant
Caution
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the
equipment.
FCC Interference Statement for Class A EVM devices
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at his own expense.
FCC Interference Statement for Class B EVM devices
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
For EVMs annotated as IC – INDUSTRY CANADA Compliant
This Class A or B digital apparatus complies with Canadian ICES-003.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the
equipment.
Concerning EVMs including radio transmitters
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this
device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired
operation of the device.
Concerning EVMs including detachable antennas
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain
approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should
be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.
This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum
permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain
greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.
Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada.
Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de
l'utilisateur pour actionner l'équipement.
Concernant les EVMs avec appareils radio
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est
autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout
brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain
maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à
l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente
(p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.
Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel
d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans
cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.
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【Important Notice for Users of this Product in Japan】
】
This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan
If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product:
1.
2.
3.
Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and
Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of
Japan,
Use this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this
product, or
Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with
respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note
that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan.
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(address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan
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【ご使用にあたっての注】
本開発キットは技術基準適合証明を受けておりません。
本製品のご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。
1.
2.
3.
電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用いただく。
実験局の免許を取得後ご使用いただく。
技術基準適合証明を取得後ご使用いただく。
なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。
上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。
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EVALUATION BOARD/KIT/MODULE (EVM)
WARNINGS, RESTRICTIONS AND DISCLAIMERS
For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished
electrical equipment and not intended for consumer use. It is intended solely for use for preliminary feasibility evaluation in
laboratory/development environments by technically qualified electronics experts who are familiar with the dangers and application risks
associated with handling electrical mechanical components, systems and subsystems. It should not be used as all or part of a finished end
product.
Your Sole Responsibility and Risk. You acknowledge, represent and agree that:
1.
2.
3.
4.
You have unique knowledge concerning Federal, State and local regulatory requirements (including but not limited to Food and Drug
Administration regulations, if applicable) which relate to your products and which relate to your use (and/or that of your employees,
affiliates, contractors or designees) of the EVM for evaluation, testing and other purposes.
You have full and exclusive responsibility to assure the safety and compliance of your products with all such laws and other applicable
regulatory requirements, and also to assure the safety of any activities to be conducted by you and/or your employees, affiliates,
contractors or designees, using the EVM. Further, you are responsible to assure that any interfaces (electronic and/or mechanical)
between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to
minimize the risk of electrical shock hazard.
You will employ reasonable safeguards to ensure that your use of the EVM will not result in any property damage, injury or death, even
if the EVM should fail to perform as described or expected.
You will take care of proper disposal and recycling of the EVM’s electronic components and packing materials.
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user guidelines. Exceeding the specified EVM ratings (including but not limited to input and output voltage, current, power, and
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