Texas Instruments TPS628436-7-8EVM-167 User manual

User’s Guide
TPS628436-7-8EVM-167 Evaluation Module
ABSTRACT
The TPS628436-7-8EVM-167 (BSR167) facilitates the evaluation of the TPS62843 family of 600-mA, step-down
converters with 300-nA IQ in tiny 0.8-mm by 1.05-mm WCSP packages with 0.4-mm pitch. The EVM contains 3
separate circuits to create output voltages between 0.4 V and 3.6 V from higher input voltages between 1.8 V
and 5.5 V. All circuits have a maximum height of 1.0-mm. The TPS62843x is a highly efficient and tiny solution
for point-of-load (POL) converters for space-constrained applications, such as wearables and smartphones.
Table of Contents
1 Introduction.............................................................................................................................................................................2
1.1 Performance Specification................................................................................................................................................. 2
1.2 Modifications...................................................................................................................................................................... 2
2 Setup........................................................................................................................................................................................4
2.1 Input/Output Connector Descriptions................................................................................................................................. 4
2.2 Setup..................................................................................................................................................................................4
3 Board Layout...........................................................................................................................................................................5
4 Schematic................................................................................................................................................................................7
5 List of Materials.......................................................................................................................................................................9
List of Figures
Figure 1-1. Loop Response Measurement Modification.............................................................................................................. 3
Figure 3-1. Top Assembly............................................................................................................................................................ 5
Figure 3-2. Top Layer...................................................................................................................................................................6
Figure 3-3. Bottom Layer............................................................................................................................................................. 6
Figure 4-1. TPS628436 Schematic..............................................................................................................................................7
Figure 4-2. TPS628437 Schematic..............................................................................................................................................7
Figure 4-3. TPS628438 Schematic..............................................................................................................................................8
List of Tables
Table 1-1. BSR167 Circuit Options.............................................................................................................................................. 2
Table 1-2. Performance Specification Summary..........................................................................................................................2
Table 2-1. Input/Output Connectors.............................................................................................................................................4
Table 5-1. TPS628436 List of Materials.......................................................................................................................................9
Table 5-2. TPS628437 List of Materials.......................................................................................................................................9
Table 5-3. TPS628438 List of Materials.......................................................................................................................................9
Trademarks
All trademarks are the property of their respective owners.
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1 Introduction
The TPS62843x is a family of synchronous, step-down converters in a 0.8-mm × 1.05-mm wafer chip-scale
package (WCSP) with a 0.4-mm pitch. The BSR167 EVM contains three completely independent circuits, each
for a different IC version. See Table 1-1 for a summary of the BSR167 EVMs.
The reference designator order is grouped by sub-circuit. Reference designators beginning with 1 (for example,
R1x, J1x, C1x) are part of one sub-circuit. The second digit of each reference designator is the same for the
same component in different sub-circuits. R11, R21, and R31, for example, refer to the same resistor in each
sub-circuit.
Table 1-1. BSR167 Circuit Options
EVM Version IC Installed Output Voltage Setpoint Output Voltage
Setpoint Range Output Current
TPS628436-7-8EVM167
(BSR167-001)
TPS628436 (U11) 0.6 V 0.4-0.8 V (adjustable) 600 mA
TPS628437 (U21) 0.9 V 0.8-1.8 V (adjustable) 600 mA
TPS628438 (U31) 1.8 V 1.8-3.6 V (adjustable) 600 mA
1.1 Performance Specification
Table 1-2 provides a summary of the TPS628436-7-8EVM-167 performance specifications.
Table 1-2. Performance Specification Summary
SPECIFICATION MIN TYP MAX UNIT
Input voltage 1.8 3.6 5.5 V
Output voltage setpoint See Table 1-1 V
Output current 0 See Table 1-1 mA
1.2 Modifications
The printed circuit board (PCB) for this EVM is designed to accommodate all the output voltage versions of this
integrated circuit (IC). Extra input and output capacitors can also be added. Finally, the loop response of the IC
can be measured by configuring the board.
1.2.1 Adjusting the Output Voltage
The output voltage can be adjusted through the choice of Rx1 and Rx2 resistors. Since Rx1 and Rx2 are in
parallel, only Rx1 or Rx2 should be installed one at a time. Rx1 is an 0201 size to represent a typical solution in
actual application. However, such a small size is difficult to replace. Therefore, Rx2 is provided in an 0603 size to
change the output voltage easily. Simply remove Rx1 and place the desired value to Rx2.
1.2.2 Input and Output Capacitors
Cx2 provides an additional input capacitor. This capacitor is not required for proper operation but can be used to
reduce the input voltage ripple.
Cx5, Cx6, and Cx7 are options for additional output capacitors. These capacitors are not mandatory for the
device's proper operation. But it can be used to reduce the output voltage ripple and improve the load transient
response. The total output capacitance must remain within the recommended range in the data sheet for proper
operation.
1.2.3 Loop Response Measurement
The loop response of the EVM can be measured with two simple changes to the circuitry. First, cut the trace
between the VOS pin and the output capacitor on the top layer. This change is shown in Figure 1-1. Second,
place a 10-Ω resistor across the resistor pads on the back of the PCB at Rx3. The pads are spaced to
allow installation of an 0603-sized resistor. With these changes, an ac signal (100-mV, peak-to-peak amplitude
recommended) can be injected into the control loop across the added resistor. Details of measuring the control
loop of DCS-Control devices are found in How to Measure the Control Loop of DCS-Control™ Devices.
Introduction www.ti.com
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Cut Trace as
Shown
Figure 1-1. Loop Response Measurement Modification
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2 Setup
This section describes how to properly use the TPS628436-7-8EVM-167.
2.1 Input/Output Connector Descriptions
Table 2-1. Input/Output Connectors
Input/Output Description
Jx1, Pin 1 and 2 – VIN Positive input connection from the input supply for the EVM.
Jx1, Pin 3 and 4 – S+/S- Input voltage sense connections. Measure the input voltage at this point.
Jx1, Pin 5 and 6 – GND Input return connection from the input supply for the EVM.
Jx2, Pin 1 and 2 – VOUT Output voltage connection.
Jx2, Pin 3 and 4 – S+/S- Output voltage sense connections. Measure the output voltage at this point.
Jx2, Pin 5 and 6 – GND Output return connection.
JPx1 – EN EN pin input jumper. Place the supplied jumper across ON and EN to turn on the IC. Place the jumper
across OFF and EN to turn off the IC.
Note
To achieve a different output voltage, disconnect the power supply of the EVM. Replace the
R11/R21/R31 accordingly (refer to Sec. 6.1 of the data sheet), then power up the device again.
2.2 Setup
To operate the EVM, set jumpers JPx1 to the desired position per Section 2.1. Connect the input supply to Jx1
and connect the load to Jx2.
Setup www.ti.com
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3 Board Layout
This section provides the TPS62843678EVM-167 board layout and illustrations in Figure 3-1 through Figure 3-3.
Figure 3-1. Top Assembly
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Figure 3-2. Top Layer Figure 3-3. Bottom Layer
Board Layout www.ti.com
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4 Schematic
Figure 4-1 illustrates the TPS628436 EVM schematic.
VIN
ON
EN
OFF
GND
VIN
600mA
GND
GND
47uF
C13
4.7uF
C12
VOUT
4.7uF
C16
10.0
R13
10uF
C15
GND
GND
GND
4.7uF
C11
1µH
L11
5
4
1
2
3
6
J11
56.2k
R11
56.2k
R12
10uF
C14 5
4
1
2
3
6
J12
1
2
3
JP11
VIN
B1
EN
C2
SW B2
VOS A2
VSET
C1 GND A1
TPS628436YKAR
U11
0
R14
10uF
C17
Figure 4-1. TPS628436 Schematic
Figure 4-2 illustrates the TPS628437 EVM schematic.
GND
S+
S-
VOUT
0.8V - 1.8VVIN
1.8V to 5.5V
S+
S-
GND
VIN1
ON
EN
OFF
GND1
VIN1
600mA
GND1
GND1
47uF
C23
4.7uF
C21
4.7uF
C22
VOUT1
4.7uF
C26
10.0
R23
10uF
C24
10uF
C25
GND1
GND1
GND1
15.4k
R21
15.4k
R22
1µH
L21
5
4
1
2
3
6
J21
5
4
1
2
3
6
J22
1
2
3
JP21
VIN
B1
EN
C2
SW B2
VOS A2
VSET
C1 GND A1
TPS628437YKAR
U21
0
R24
10uF
C27
Figure 4-2. TPS628437 Schematic
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Figure 4-3 illustrates the TPS628438 EVM schematic.
GND
S+
S-
VOUT
1.8V - 3.6VVIN
1.8V to 5.5V
S+
S-
GND
VIN2
ON
EN
OFF
GND2
VIN2
600mA
GND2
GND2
47uF
C33
4.7uF
C31
4.7uF
C32
VOUT2
4.7uF
C36
10.0
R33
10uF
C34
10uF
C35
GND2
GND2
GND2
1µH
L31
5
4
1
2
3
6
J31
5
4
1
2
3
6
J32
1
2
3
JP31
VIN
B1
EN
C2
SW B2
VOS A2
VSET
C1 GND A1
TPS628438YKAR
U31
0
R34
10uF
C37
10.0k
R32
10.0k
R31
Figure 4-3. TPS628438 Schematic
Schematic www.ti.com
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5 List of Materials
Table 5-1 lists the TPS628436 EVM list of materials.
Table 5-1. TPS628436 List of Materials
DES QTY DESCRIPTION PART NUMBER MANUFACTURER
C11 1 CAP, CERM, 4.7 µF, 6.3 V, ±20%, X5R, 0402 GRM155R60J475ME47D Murata
C13 1 CAP, CERM, 47 µF, 6.3 V, ±20%, X5R, 0805 GRM21BR60J476ME15L Murata
C14 1 CAP, CERM, 10 µF, 6.3 V, ±20%, X5R, 0402 GRM155R60J106ME15D Murata
L11 1 Inductor, Shielded, Metal Composite, 1 µH, 2.7 A, 0.057 ohm, SMD DFE201610E-1R0M=P2 Cyntec
R11 1 RES, 56.2 kΩ, 1%, 0.05 W, 0201 Std Std
U11 1 1.8-V to 5.5-V, 600mA 0.4-0.775V, 300-nA IQ Step Down Converter,
DSBGA6 TPS628436YKAR Texas Instruments
Table 5-2 lists the TPS628437 EVM BOM.
Table 5-2. TPS628437 List of Materials
DES QTY DESCRIPTION PART NUMBER MANUFACTURER
C21 1 CAP, CERM, 4.7 µF, 6.3 V, ±20%, X5R, 0402 GRM155R60J475ME47D Murata
C23 1 CAP, CERM, 47 µF, 6.3 V, ±20%, X5R, 0805 GRM21BR60J476ME15L Murata
C24 1 CAP, CERM, 10 µF, 6.3 V, ±20%, X5R, 0402 GRM155R60J106ME15D Murata
L21 1 Inductor, Shielded, Metal Composite, 1 µH, 2.7 A, 0.057 ohm, SMD DFE201610E-1R0M=P2 Murata
R21 1 RES, 15.4 kΩ, 1%, 0.05 W, 0201 Std Std
U21 1 1.8-V to 5.5-V, 600mA 0.4-0.775V, 300-nA IQ Step Down Converter,
DSBGA6 TPS628437YKAR Texas Instruments
Table 5-3 lists the TPS628438 EVM BOM.
Table 5-3. TPS628438 List of Materials
DES QTY DESCRIPTION PART NUMBER MANUFACTURER
C31 1 CAP, CERM, 4.7 µF, 6.3 V, ±20%, X5R, 0402 GRM155R60J475ME47D Murata
C33 1 CAP, CERM, 47 µF, 6.3 V, ±20%, X5R, 0805 GRM21BR60J476ME15L Murata
C34 1CAP, CERM, 10 µF, 6.3 V, ±20%, X5R, 0402 GRM155R60J106ME15D Murata
L31 1 Inductor, Shielded, Metal Composite, 1 µH, 2.7 A, 0.057 ohm, SMD DFE201610E-1R0M=P2 Murata
R31 1 RES, 10.0 k, 1%, 0.05 W, 0201 Std Std
U31 1 1.8-V to 5.5-V, 600mA 0.4-0.775V, 300-nA IQ Step Down Converter,
DSBGA6 TPS628438YKAR Texas Instruments
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STANDARD TERMS FOR EVALUATION MODULES
1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or
documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance
with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.
1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility
evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not
finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For
clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions
set forth herein but rather shall be subject to the applicable terms that accompany such Software
1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,
or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production
system.
2Limited Warranty and Related Remedies/Disclaimers:
2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License
Agreement.
2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by
neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have
been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications
or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control
techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.
User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)
business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.
2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit
User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty
period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or
replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be
warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day
warranty period.
WARNING
Evaluation Kits are intended solely for use by technically qualified,
professional electronics experts who are familiar with the dangers
and application risks associated with handling electrical mechanical
components, systems, and subsystems.
User shall operate the Evaluation Kit within TI’s recommended
guidelines and any applicable legal or environmental requirements
as well as reasonable and customary safeguards. Failure to set up
and/or operate the Evaluation Kit within TI’s recommended
guidelines may result in personal injury or death or property
damage. Proper set up entails following TI’s instructions for
electrical ratings of interface circuits such as input, output and
electrical loads.
NOTE:
EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION
KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.