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Table of Contents
User’s Guide
TPS629210E Buck Converter Evaluation Module User's
Guide
ABSTRACT
The TPS629210EEVM is designed to help user easily evaluate the performance of TPS629210E. The user’s
guide includes the following:
• Performance characteristics
• EVM configuration
• Test setup
• Test result
• PCB layout
• Schematic diagram
• Bill of materials
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Performance Specification.................................................................................................................................................... 2
3 EVM Configuration and Modification....................................................................................................................................3
3.1 Input and Output Capacitors.............................................................................................................................................. 3
3.2 Configurable Enable Threshold Voltage.............................................................................................................................3
3.3 MODE/S-CONF Setting......................................................................................................................................................3
3.4 Power Good....................................................................................................................................................................... 3
3.5 Power-Good Pullup Voltage............................................................................................................................................... 3
3.6 Feedforward Capacitor Option........................................................................................................................................... 3
3.7 Output Voltage Setting....................................................................................................................................................... 4
3.8 Loop Response Measurement........................................................................................................................................... 4
4 EVM Test Setup....................................................................................................................................................................... 5
4.1 Input and Output Connectors............................................................................................................................................. 5
4.2 Jumper Configuration.........................................................................................................................................................5
5 Test Results.............................................................................................................................................................................6
6 Board Layout.........................................................................................................................................................................12
7 Schematic and Bill of Materials...........................................................................................................................................15
7.1 Schematic........................................................................................................................................................................ 15
7.2 Bill of Materials.................................................................................................................................................................15
8 References............................................................................................................................................................................ 16
Trademarks
All trademarks are the property of their respective owners.
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Introduction
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1 Introduction
The TPS629210E is high-efficiency and highly flexible synchronous step-down buck converter in a small
1.6-mm × 2.1-mm SOT583 package with –55°C to 150°C extended operating temperature performance. The
TPS629210E can be configured to run 2.5 MHz or 1 MHz in either forced PWM mode or auto PFM/PWM mode.
In 2.5-MHz auto PFM/PWM mode, TI AEE mode automatically adjusts the switching frequency based on both
input and output voltage to hold a high efficiency through the whole operation range without the need of using
different inductors. The device includes a Mode/S-CONF input to select different combinations of following:
• External/internal feedback
• Max switching frequency
• Output discharge enable/disable
• Auto PFM/PWM(with AEE) and forced PWM operations
The TPS629210EEVM(BSR131-008) uses 1-A TPS629210E converter to produce 3.3-V output from a 12-V
input.
2 Performance Specification
Table 2-1 provides a summary of the TPS629210EEVM performance specifications. All the specifications are
given at an ambient temperature of 25°C.
Table 2-1. TPS629210EEVM Performance Specification Summary
Specification
Test Conditions
Input voltage
MIN
TYP
MAX
5
12
17
Output voltage
3.3
Output current
Input current
VIN = 12 V, VOUT = 3.3 V, IOUT = 0 A, forced PWM, 2.5 MHz,
3.3-μH inductor
5.7
VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A, forced PWM, 2.5 MHz,
3.3-μH inductor
0.302
Set by the Mode/S-CONF pin
2.5
Line regulation
VIN = 5 V–17 V, VOUT= 3.3 V, IOUT = 0 A and 1 A, forced PWM,
2.5/1 MHz, VSET, 3.3-μH inductor
+0.5%, –
0.2%
Load regulation
VIN = 12 V, VOUT = 3.3 V, IOUT = 0 A–1 A, forced PWM and auto
PFM/PWM with AEE, 2.5/1 MHz, VSET, 3.3-μH inductor
+0.7%, –
0.2%
Output ripple
VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A, forced PWM, 2.5 MHz,
3.3-μH inductor
10
VIN = 12 V, VOUT = 3.3 V, IOUT = 0 A–1 A, forced PWM, 2.5 MHz,
3.3-μH inductor
90.43%
VIN = 12 V, VOUT = 3.3 V, IOUT = 0 A–1 A, auto PFM/PWM with
AEE, 2.5 MHz, 3.3-μH inductor
90.77%
VIN = 12 V, VOUT = 3.3 V, IOUT = 10 mA, auto PFM/PWM with
AEE, 2.5 MHz, 3.3-μH inductor
84.66%
V
V
1
Switching frequency
Peak efficiency
2
0
UNIT
A
mA
A
MHz
mV
Output rise time
VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A, forced PWM, 2.5 MHz,
3.3-μH inductor
500
μs
Load transient
VIN = 12 V, VOUT = 3.3 V, IOUT = 0.5 A–1 A, slew rate: 1 A/μs,
forced PWM, VSET, 2.5 MHz, 3.3-μH inductor
±58
mV
Loop bandwidth
VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A, forced PWM, VSET, 2.5
MHz, 3.3-μH inductor
95.89
kHz
Phase margin
VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A, forced PWM, VSET, 2.5
MHz, 3.3-μH inductor
84.4
deg
IC case temperature
VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A, forced PWM, 2.5 MHz,
3.3-μH inductor, 10 minutes soaking
34.6
°C
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EVM Configuration and Modification
3 EVM Configuration and Modification
The EVM is designed to provide access to features of the TPS629210E. The EVM also provides jumpers for
different configurations. Jumper selections must be made prior to enabling the TPS629210E. Additional input
and output capacitors can be added. The input voltage at which the IC turns on can be programmed with a
voltage divider. The TPS629210EEVM allows multiple MODE/S-CONF pin configurations. The loop response
can also be measured.
3.1 Input and Output Capacitors
C2 is provided for additional input capacitance. This capacitor is not required for proper operation but can be
used to reduce the input voltage ripple. C6, C7, C8, and C9 are provided for additional output capacitors. These
capacitors are not required for proper operation but can be used to reduce the output voltage ripple. The total
output capacitance must remain within the recommended range for the TPS629210E.
3.2 Configurable Enable Threshold Voltage
JP1 is provided as option for Enable pin with a precise threshold voltage. R4 and R5 can be adjusted to set a
user-selectable input voltage at which the IC turns on. The EVM pre-configured R4 and R5 to have 6.5-V rising
and 5.85-V falling threshold voltage.
3.3 MODE/S-CONF Setting
JP2 is used to set different MODE/S-CONF configurations. MODE/S-CONF can be connected to VIN and GND
as a traditional HIGH or LOW level. R6 and R7 select the other device configurations including the following:
• Internal/external feedback
• Switching frequency
• Output discharge
• Auto PFM/PWM(with AEE) or forced PWM options
The values of R6 and R7 can be changed per the user’s requirement.
•
•
While using the internal feedback (VSET) configuration for the output voltage setting, either float the FB pin
by cutting the net tie (NT1) included on the back of the board or remove both R1 and R2 for a 3.3-V output
voltage. Other output voltage can be programmed by removing R1 and changing the value of R2. Ensure the
JP2 jumper is placed correctly for proper operation with internal feedback.
WARNING
Do not set the MODE/S-CONF pin for external feedback if either the net tie (NT1) is cut or R1
and R2 are removed. This can cause damage to the device due to lack of external feedback
control.
Dynamic mode option is an advance feature that allows MODE/S-CONF pin to actively switch between forced
PWM and auto PFM/PWM during operation, but this is only possible by driving the MODE/S-CONF pin
between VIN and GND. This feature provides the user with the option of controlling if and when the device
enters power save mode (DCM).
3.4 Power Good
JP3 is provided as an option for power-good test point. If power good is not used, it is recommended to tie to
GND or leave open.
3.5 Power-Good Pullup Voltage
JP4 is provided as an option for power-good pull up voltage. Either VIN or VOUT with a 100-kΩ pullup resistor.
3.6 Feedforward Capacitor Option
C10 is provided as an optional of a feedforward capacitor (CFF). It helps to improve the loop stability if
needed. A more detailed discussion on the optimization for stability versus transient response can be found
in the Optimizing Transient Response of Internally Compensated dc-dc Converter With Feedforward Capacitor
and Feedforward Capacitor to Improve Stability and Bandwidth With the TPS621-Family and TPS821-Family
application reports.
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EVM Configuration and Modification
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3.7 Output Voltage Setting
The TPS629210EEVM is configured for external feedback as default with an output voltage of 3.3 V set by R1
and R2. Additionally, if the internal feedback (VSET) configuration is used, the user can cut net tie NT1 located
on the back of the board (shown in Figure 3-1). This will float the FB pin resulting in a 3.3-V output voltage using
the internal VSET. Resistors R1 and R2 can also be changed to set the output voltage between 0.6 V and 5.5 V.
See the TPS629210E data sheet for recommended values. R2 was populated with 34 k such that if the internal
(VSET) is chosen while R1 is removed, the device will regulate to 1.8-V output voltage.
WARNING
If the output voltage is increased, make sure the voltage rating of output capacitor C5 is sized
appropriately.
Figure 3-1. Internal Feedback (VSET) Configuration Board Modification
3.8 Loop Response Measurement
The loop response can be measured after simple changing to the board. First, cut net tie (NT2) and install a
10-Ω 0603 resistor on the bottom of board (shown inFigure 3-2). An AC signal (10-mV, peak-to-peak amplitude
is recommended) can be injected into the control loop across the added 10-Ω resistor.
Figure 3-2. Bode Plot Measurement Board Modification
4
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EVM Test Setup
4 EVM Test Setup
This section describes how to properly test the EVM.
4.1 Input and Output Connectors
Table 4-1. Input and Output Connector
Connector
J1
J2
Pins
Description
Pin 1 and Pin 2
VIN positive input for input supply
Pin 3 and Pin 4
S+ and S– input voltage sense. Input voltage measure points
Pin 5 and Pin 6
GND return for input supply
Pin 1 and Pin 2
VOUT output voltage connection
Pin 3 and Pin 4
S+ and S– output voltage sense. Output voltage measure points
Pin 5 and Pin 6
GND output return connection
4.2 Jumper Configuration
4.2.1 JP1 Enable
Table 4-2. Enable Pin Configuration
Jumper Short Location
Description
Pin 2 and Pin 3
Turn on the device as default.
Pin 3 and Pin 4
Turn off the device.
Pin 1 and Pin 2, Pin 3 and Pin 4
Set the programmable Enable threshold voltage with R4 and R5.
Pin 3 and Pin 4
Pin 1 can be used for an external supply voltage with a R4 and R5 resistor divider.
4.2.2 JP2 MODE/S-CONF
Table 4-3. MODE/S-CONF Pin Configuration
Jumper Short Location
Description
Pin 1 and Pin 3
Forced PWM, 2.5 MHz, external FB, output discharge enabled
Pin 3 and Pin 5
Auto PFM/PWM with AEE, 2.5 MHz, external FB, output discharge enabled
Pin 2 and Pin 4
124 k to GND, forced PWM, 1 MHz, internal FB (VSET), output discharge disabled
Pin 4 and Pin 6
64.9 k to GND, auto PFM/PWM, 1 MHz, internal FB (VSET), output discharge enabled
4.2.3 JP3 Power Good
The PGOOD output is on pin 1 of this header with a convenient ground on pin 2. If PG is not used, short pin 1
and pin 2 by a jumper
4.2.4 JP4 PG Pullup Voltage
Table 4-4. PG Pullup Voltage Option
Jumper Short Location
Description
Pin 1 and Pin 2
PG pulls up to the output voltage
Pin 2 and Pin 3
PG pulls up to the input voltage.
No jumper
JP4 pin2 can pull up to different external voltage. This external voltage must remain
below 18 V.
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Test Results
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5 Test Results
This section provides the test results of the TPS629210EEVM.
Figure 5-1. Efficiency, VIN= 12 V, VOUT = 3.3 V, FSW = 2.5 MHz and 1 MHz
Figure 5-2. Load Regulation, VIN = 12 V, VOUT = 3.3 V, FSW = 2.5 MHz and 1 MHz
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Test Results
Figure 5-3. Line Regulation, VIN = 5 V–17 V, VOUT = 3.3 V, IOUT = 0 A and 1 A, FSW = 2.5 MHz and 1 MHz
Figure 5-4. Loop Response Forced PWM VSET, VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A
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Test Results
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Figure 5-5. Output Voltage Ripple Auto PFM/PWM, VIN = 12 V, VOUT = 3.3 V, IOUT = 0 A
Figure 5-6. Output Voltage Ripple Forced PWM, VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A
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Test Results
Figure 5-7. Input Voltage Ripple Forced PWM, VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A
Figure 5-8. Enable Start-Up Forced PWM, VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A
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Test Results
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Figure 5-9. Enable Shutdown Forced PWM, VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A
Figure 5-10. Enable Pre-Bias Start-Up Forced PWM, VIN = 12 V, VOUT = 3.3 V, IOUT = 0 A
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Test Results
Figure 5-11. Load Transient Forced PWM VSET, VIN = 12 V, VOUT = 3.3 V, IOUT= 0.5 A–1 A, Slew Rate = 1
A/μs
Figure 5-12. Thermal Performance Forced PWM, VIN = 12 V, VOUT = 3.3 V, IOUT = 1 A, FSW = 2.5 MHz
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Board Layout
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6 Board Layout
This section provides the EVM board layout and illustrations.
Figure 6-1. Top Assembly
Figure 6-2. Top Layer
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Board Layout
Figure 6-3. Internal Layer 1
Figure 6-4. Internal Layer 2
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Board Layout
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Figure 6-5. Bottom Layer
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Schematic and Bill of Materials
7 Schematic and Bill of Materials
This section provides the EVM schematic and bill of materials (BOM).
7.1 Schematic
J3
1
2DNP
U1
1
2
3
4
5
6
VIN
3V to 17V
S+
SGND
6
VIN
SW
4
SW
L1
VOUT 1
4.7uF
C4
100nF
EN
7
VOS
EN
FB/VSET
MODE 8
J1
MODE/S-CONF
PG
GND
3
3.3µH
1
FB/VSET
2
PG
DNPC7
22uF
DNPC8
22uF
DNPC9
47uF
S+
SGND
J2
VOS
R1
154k
TPS629210DRLR-ET
ON
EN
OFF
DNPC6
22µF
5
R4
549k
1
2
3
4
C5
22uF
NT2
Net-Tie
VOUT
2
3
4
5
6
XGL3530-332MEC
C3
DNPC2
10uF
C1
47uF
DNPC10
22pF
NT1
VIN
VOUT
1
2 PGPU
VIN
3
VOUT
PG_PULL-UP
VIN
Net-Tie
JP4
R2
34.0k
JP1
R5
100k
R3
100k
JP3
GND
PG
VIN
MODE
APFM
1
3
5
PG
GND
R6
JP2
FPWM
1
2
2
4
6
124k
R7
EXTFB
INTFB
GND
64.9k
GND
Figure 7-1. TPS629210EEVM Schematic
7.2 Bill of Materials
Table 7-1. TPS629210EEVM Bill of Materials
Designator
Qty
Value
Description
Package
Part Number
Manufacturer
C1
1
47 μF
CAP, TA, 47 μF, 35 V, ±10%, 0.3 Ω,
SMD
7343-43
T495X476K035ATE300
Kemet
C3
1
4.7 μF
Cap Ceramic 4.7-μF 25-V X7R 10% 1206
Pad SMD 1206 +125°C Automotive
T/R
CGA5L1X7R1E475K160A TDK
C
C4
1
0.1 μF
CAP, CERM, 0.1 μF, 25 V, ±10%,
X7R, 0603
0603
C0603C104K3RACTU
Kemet
C5
1
22 μF
CAP, CERM, 22 μF, 6.3 V, ±20%,
X7T, AEC-Q200 Grade 1, 0805
0805
GCM21BD70J226ME36L
MuRata
J1, J2
2
Header, 2.54 mm, 6 × 1, Gold, TH
Header, 2.54
mm, 6 × 1, TH
61300611121
Wurth Elektronik
JP1
1
Header, 2.54 mm, 4 × 1, Gold, TH
Header, 2.54
mm, 4 × 1, TH
61300411121
Wurth Elektronik
JP2
1
Header, 2.54 mm, 3 × 2, Gold, TH
Header, 2.54
mm, 3 × 2, TH
61300621121
Wurth Elektronik
JP3
1
Header, 2.54 mm, 2 × 1, Gold, TH
Header, 2.54
mm, 2 × 1, TH
61300211121
Wurth Elektronik
JP4
1
Header, 2.54 mm, 3 × 1, Gold, TH
Header, 2.54
mm, 2 × 1, TH
61300311121
Wurth Elektronik
L1
1
Molded Power Inductor, Shielded,
3.3-μH 20%, 5.4-A, 37.4 mΩ DCR
Max, AEC-Q200, T/R
SMT_IND_3M
M2_3MM5
XGL3530-332MEC
Coilcraft
LBL1
1
Thermal Transfer Printable Labels,
0.650" W × 0.200" H - 10,000 per
roll
PCB Label
0.650 × 0.200
inch
THT-14-423-10
Brady
R1
1
154 k
RES, 154 k, 1%, 0.1 W, 0603
0603
RC0603FR-07154KL
Yageo
R2
1
34.0 k
RES, 34.0 k, 1%, 0.1 W, 0603
0603
RC0603FR-0734KL
Yageo
R3, R5
2
100 k
RES, 100 k, 1%, 0.1 W, 0603
0603
RC0603FR-07100KL
Yageo
R4
1
549 k
RES, 549 k, 1%, 0.1 W, 0603
0603
RC0603FR-07549KL
Yageo
R6
1
124 k
RES, 124 k, 1%, 0.1 W, 0603
0603
RC0603FR-07124KL
Yageo
R7
1
64.9 k
RES, 64.9 k, 1%, 0.1 W, 0603
0603
RC0603FR-0764K9L
Yageo
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References
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Table 7-1. TPS629210EEVM Bill of Materials (continued)
Designator
Qty
U1
1
C2
0
C6
Value
Description
Package
Part Number
Manufacturer
3-V to 17-V, Synchronous Buck
Converters in 1.6-mm × 2.1-mm
SOT583 Package
SOT583
TPS629210DRLR-ET
Texas
Instruments
10 μF
CAP, CERM, 10 μF, 25 V, ±20%,
X7R, 1206_190
1206_190
C3216X7R1E106M160AE TDK
0
22 μF
CAP, CERM, 22 µF, 6.3 V, ±20%,
X7T, AEC-Q200 Grade 1, 0805
0805
CGA4J1X7T0J226M
C7, C8
0
22 μF
CAP, CERM, 22 μF, 10 V, ±20%,
X7S, 0805
0805
C2012X7S1A226M125AC TDK
C9
0
47 μF
CAP, CERM, 47 μF, 6.3 V, ±20%,
X7R, 1210
1210
GRM32ER70J476ME20L
MuRata
C10
0
22 pF
CAP, CERM, 22 pF, 50 V, ±5%,
C0G/NP0, 0603
0603
GRM1885C1H220JA01D
MuRata
J3
0
Header, 2.54 mm, 2 × 1, Gold, TH
Header, 2.54
mm, 2 × 1, TH
61300211121
Wurth Elektronik
TDK
8 References
Texas Instruments, TPS629210E, 3 V to 17 V, 1-A Low Iq Buck Converter in SOT583 Package data sheet
16
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