Texas Instruments TPS54A20EVM-770 User manual

1
SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
User's Guide
SLVUAM8A–December 2015–Revised March 2019
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation
module
This user’s guide contains information for the TPS54A20EVM-770 evaluation module (PWR770) as well
as for the TPS54A20 dc/dc converter. Also included are the performance specifications, the schematic,
and the bill of materials for the TPS54A20EVM-770.
Contents
1 Introduction ................................................................................................................... 2
2 Test Setup and Results..................................................................................................... 4
3 Board Layout................................................................................................................ 14
4 Schematic and Bill of Materials........................................................................................... 16
List of Figures
1 TPS54A20EVM-770 Efficiency............................................................................................. 6
2 TPS54A20EVM-770 Low Current Efficiency............................................................................. 6
3 TPS54A20EVM-770 Load Regulation .................................................................................... 7
4 TPS54A20EVM-770 Line Regulation ..................................................................................... 7
5 TPS54A20EVM-770 Transient Response................................................................................ 8
6 TPS54A20EVM-770 Loop Response ..................................................................................... 8
7 TPS54A20EVM-770 Output Ripple, 0 A Load........................................................................... 9
8 TPS54A20EVM-770 Output Ripple, 5 A Load........................................................................... 9
9 TPS54A20EVM-770 Output Ripple, 10 A Load........................................................................ 10
10 TPS54A20EVM-770 Input Ripple, 0 A Load............................................................................ 10
11 TPS54A20EVM-770 Input Ripple, 5 A Load............................................................................ 11
12 TPS54A20EVM-770 Input Ripple, 10 A Load .......................................................................... 11
13 TPS54A20EVM-770 Start-Up Relative to VIN........................................................................... 12
14 TPS54A20EVM-770 Start-Up Relative to Enable...................................................................... 12
15 Thermal Image ............................................................................................................. 13
16 TPS54A20EVM-770 Top-Side Assembly ............................................................................... 14
17 TPS54A20EVM-770 Top-Side Layout................................................................................... 14
18 TPS54A20EVM-770 Internal Layer-1 Layout........................................................................... 14
19 TPS54A20EVM-770 Internal Layer-2 Layout........................................................................... 14
20 TPS54A20EVM-770 Bottom-Side Layout............................................................................... 14
21 TPS54A20EVM-770 Schematic.......................................................................................... 16
List of Tables
1 Input Voltage and Output Current Summary............................................................................. 3
2 TPS54A20EVM-770 Performance Specification Summary ............................................................ 3
3 EVM Connectors and Test Points......................................................................................... 5
4 TPS54A20EVM-770 Bill of Materials .................................................................................... 17
Trademarks
SWIFT is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.

!
Introduction www.ti.com
2SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback
Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
1 Introduction
1.1 Before You Begin
The following warnings and cautions are noted for the safety of anyone using or working close to the
TPS54A20EVM-770. Observe all safety precautions.
Warning The TPS54A20EVM-770 circuit module may become hot
during operation due to dissipation of heat. Avoid contact with
the board. Follow all applicable safety procedures applicable
to your laboratory.
Caution Do not leave the EVM powered when unattended.
WARNING
The circuit module has signal traces, components, and component
leads on the bottom of the board. This may result in exposed
voltages, hot surfaces or sharp edges. Do not reach under the
board during operation.
CAUTION
The circuit module may be damaged by over temperature. To avoid damage,
monitor the temperature during evaluation and provide cooling, as needed, for
your system environment.
CAUTION
Some power supplies can be damaged by application of external voltages. If
using more than 1 power supply, check your equipment requirements and use
blocking diodes or other isolation techniques, as needed, to prevent damage to
your equipment.

www.ti.com Introduction
3
SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
1.2 Background
The TPS54A20 dc/dc converter is a two-phase synchronous series capacitor buck converter designed to
provide up to a 10-A output. The input (VIN) is rated for 8 V to 14 V. Rated input voltage and output
current range for the evaluation module are given in Table 1. This evaluation module is designed to
demonstrate the small printed-circuit-board areas that may be achieved when designing with the
TPS54A20 regulator. The switching frequency is externally set at a nominal 2 MHz for each side, 4 MHz
effective. The high-side and low-side MOSFETs are incorporated inside the TPS54A20 package along
with the gate drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS54A20
to achieve high efficiencies and helps keep the junction temperature low at high output currents. The
compensation components are internal to the integrated circuit (IC), and an external divider allows for an
adjustable output voltage. Additionally, the TPS54A20 provides adjustable slow start and undervoltage
lockout inputs. The absolute maximum input voltage is 15 V while switching and 17 V for non-switching
conditions.
Table 1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE RANGE OUTPUT CURRENT
RANGE
TPS54A20EVM-770 VIN = 9.2 V to 14 V 0 A to 10 A
1.3 Performance Specification Summary
A summary of the TPS54A20EVM-770 performance specifications is provided in Table 2. Specifications
are given for an input voltage of VIN = 12 V and an output voltage of 1.2 V, unless otherwise specified. The
TPS54A20EVM-770 is designed and tested for VIN = 9.2 V to 14 V. The ambient temperature is 25°C for
all measurements, unless otherwise noted.
Table 2. TPS54A20EVM-770 Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
VIN voltage range 9.2 12 14 V
VIN start voltage 9.39 V
VIN stop voltage 9.14 V
Output voltage setpoint 1.2 V
Output current range VIN = 9.2 V to 14 V 0 10 A
Line regulation IO= 5 A, VIN = 9.2 V to 14 V ±0.04%
Load regulation VIN = 12 V, IO= 0 A to 10 A ±0.03%
Load transient response IO= 0 A to 9 A Voltage change –60 mV
Recovery time 60 µs
IO= 9 A to 0 A Voltage change 60 mV
Recovery time 60 µs
Loop bandwidth VIN = 12 V, IO= 5 A 280 kHz
Phase margin VIN = 12 V , IO= 5 A 45 degree
Input ripple voltage IO= 10 A 90 mVPP
Output ripple voltage IO= 10 A 20 mVPP
Output rise time 512 µs
Operating frequency 2 MHz
Maximum efficiency TPS54A20EVM-770, VIN = 9 V, IO= 5 A 84.7%

EN(TOP) EN
EN(BOT)
IN(FALL) EN EN(TOP) EN(FALL)
R V
R = V - V
x
+ xR I
IN(RISE) IN(FALL)
EN(TOP)
EN(FALL) EN(RISE)
V - V
R = I - I
(TON) OUT
R 3 k 15 k x V= +
( )
(BOT) OUT REF
(TOP)
REF
R x V - V
RV =
Introduction www.ti.com
4SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback
Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
1.4 Modifications
These evaluation modules are designed to provide access to the features of the TPS54A20. Some
modifications can be made to this module.
1.4.1 Output Voltage Setpoint
The output voltage is set by the resistor divider network of R9 (R(TOP)) and R7 (R(BOT)). R7 is fixed at 14.3
kΩ. To change the output voltage of the EVM, it is necessary to change the value of resistor R9. Changing
the value of R9 can change the output voltage above the 0.508 V reference voltage VREF. The value of R9
for a specific output voltage can be calculated using Equation 1.
(1)
1.4.2 On Time
The TON pin requires a resistor to set the nominal on-time and to support the input voltage feed forward
circuit. The resistance value used also influences the internal ramp in the controller. UseEquation 2 for
selecting the TON resistor.
(2)
The RTON resistor selected for this design example is 22.1 kΩ. During startup, the converter uses the
nominal on-time programmed through TON. The phase lock loop (PLL) is only activated after startup is
complete. When the PLL is engaged, the on-time is adjusted. If the nominal on-time programmed
through the TON pin is not close to the on-time when the PLL is engaged, the SYNC range of the
device may be reduced. The TON resistor can also be adjusted to tune the controller. Lowering the
RTON value will increase the internal ramp height. This will reduce the converter’s sensitivity to noise
and jitter but it will also reduce the transient response capabilities of the converter.
1.4.3 Adjustable UVLO
The undervoltage lockout (UVLO) can be adjusted externally using R2 (REN(TOP)) and R3 (REN(BOT)). The
EVM is set for a start voltage of 9.385 V and a stop voltage of 9.144 V using R2 = 80.6 kΩand R3 = 12.4
kΩ. Use Equation 3 and Equation 4 to calculate required resistor values for different start and stop
voltages. IEN(FALL) = 4 µA, IEN(RISE) = 1 µA and VEN = 1.23 V
(3)
(4)
2 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54A20EVM-770 evaluation
module. The section also includes test results typical for the evaluation module and covers efficiency,
output voltage regulation, load transients, loop response, output ripple, input ripple, and start-up.
2.1 Input/Output Connections
The TPS54A20EVM-770 is provided with input/output connectors and test points as shown in Table 3. A
power supply capable of supplying greater than 2 A must be connected to J1 through a pair of 20 AWG
wires or better. The load must be connected to J4 through a pair of 20 AWG wires or better. The
maximum load current capability is 10 A. Wire lengths must be minimized to reduce losses in the wires.
Test-point TP1 provides a place to monitor the VIN input voltages with TP2 providing a convenient ground
reference. TP7 is used to monitor the output voltage with TP8 as the ground reference.

www.ti.com Test Setup and Results
5
SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
Table 3. EVM Connectors and Test Points
Reference Designator Function
J1 VIN input voltage connector. (See Table 1 for VIN range).
J2 2-pin header for enable. Connect EN to ground to disable, open to enable.
J3 External VG+ header. To improve converter efficiency, an external 5V supply is recommended to be
connected to the VG+ pin (J3-2) to GND (J3-1).
J4 VOUT, 1.2 V at 10 A maximum.
TP1 VIN test point.
TP2 GND test point at VIN connector.
TP3 PGOOD test point.
TP4 SYNC test point.
TP5 VG+ test point.
TP6 Test point between voltage divider network and output. Used for loop response measurements.
TP7 Output voltage test point.
TP8 GND test point
TP9 Test point at gate of transient load circuit.
TP10 GND test point at input of transient load circuit.
TP11 Test point at top of transient load circuit load resistor
TP12 Test point at bottom (GND) of transient load circuit load resistor
TP13 Analog ground (AGND) test point.

Output Current (A)
Efficiency (%)
0.001 0.01 0.1 1 10
0
10
20
30
40
50
60
70
80
90
100
D002
VIN = 9V
VIN = 12V
VIN = 14V
Output Current (A)
Efficiency (%)
0 1 2 3 4 5 6 7 8 9 10
0
10
20
30
40
50
60
70
80
90
100
D001
VIN = 9V
VIN = 12V
VIN = 14V
Test Setup and Results www.ti.com
6SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback
Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
2.2 Efficiency
The efficiency of this EVM peaks at a load current of about 5 A and then decreases as the load current
increases toward full load. Figure 1 shows the efficiency for the TPS54A20EVM-770 at an ambient
temperature of 25°C.
Figure 1. TPS54A20EVM-770 Efficiency
Figure 2 shows the efficiency for the TPS54A20EVM-770 using a semi-log scale to more easily show
efficiency at lower output currents. The ambient temperature is 25°C.
Figure 2. TPS54A20EVM-770 Low Current Efficiency
The efficiency may be lower at higher ambient temperatures, due to temperature variation in the drain-to-
source resistance of the internal MOSFET.

Input Voltage (V)
Line Regulation (%)
9 10 11 12 13 14
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
D004
Output Current (A)
Load Regulation (%)
0 1 2 3 4 5 6 7 8 9 10
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
D003
www.ti.com Test Setup and Results
7
SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
2.3 Output Voltage Load Regulation
Figure 3 shows the load regulation for the TPS54A20EVM-770.
Figure 3. TPS54A20EVM-770 Load Regulation
Measurements are given for an ambient temperature of 25°C.
2.4 Output Voltage Line Regulation
Figure 4 shows the line regulation for the TPS54A20EVM-770.
Figure 4. TPS54A20EVM-770 Line Regulation

Frequency (Hz)
Gain (dB)
Phase (Degrees)
100 200300 500 1000 2000 5000 10000 20000 50000100000 1000000
-60 -180
-50 -150
-40 -120
-30 -90
-20 -60
-10 -30
0 0
10 30
20 60
30 90
40 120
50 150
60 180
EVMU
V = 50 mV / div (ac coupled)
O
Time = 50 µsec / div
I = 5 A / div
O
Load step = 0 A - 9 A, slew rate = 9 A / µsec
Test Setup and Results www.ti.com
8SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback
Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
2.5 Load Transients
Figure 5 shows the TPS54A20EVM-770 response to load transients. The current step is from 0 A to 9 A.
The current step slew rate is 9 A/µs. Total peak-to-peak voltage variation is as shown, including ripple and
noise on the output. The transient waveform is measured using the on-board fast transient circuit.
CAUTION
Q1 may get hot. Limit the power dissipation to 3W or less. Use low duty cycles.
Figure 5. TPS54A20EVM-770 Transient Response
2.6 Loop Characteristics
Figure 6 shows the TPS54A20EVM-770 loop-response characteristics. Gain and phase plots are shown
for VIN voltage of 12 V. Load current for the measurement is 5 A.
Figure 6. TPS54A20EVM-770 Loop Response

V = 20 mV / div (ac coupled)
O
Time = 200 nsec / div
SWA = 5 V / div
SWB = 5 V / div
V = 20 mV / div (ac coupled)
O
Time = 200 nsec / div
SWA = 5 V / div
SWB = 5 V / div
www.ti.com Test Setup and Results
9
SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
2.7 Output Voltage Ripple
Figure 7,Figure 8, and Figure 9 show the TPS54A20EVM-770 output voltage ripple. The load currents are
0A,5Aand10A.VIN = 12 V. The ripple voltage is measured directly across TP7 and TP8.
Figure 7. TPS54A20EVM-770 Output Ripple, 0 A Load
Figure 8. TPS54A20EVM-770 Output Ripple, 5 A Load

V = 50 mV / div (ac coupled)
I
Time = 200 nsec / div
SWA = 5 V / div
SWB = 5 V / div
V = 20 mV / div (ac coupled)
O
Time = 200 nsec / div
SWA = 5 V / div
SWB = 5 V / div
Test Setup and Results www.ti.com
10 SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback
Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
Figure 9. TPS54A20EVM-770 Output Ripple, 10 A Load
2.8 Input Voltage Ripple
Figure 10,Figure 11 and Figure 12 show the TPS54A20EVM-770 input voltage ripple. The load currents
are 0 A, 5 A and 10 A. VIN = 12 V. The ripple voltage is measured directly across TP1 and TP2.
Figure 10. TPS54A20EVM-770 Input Ripple, 0 A Load

V = 50 mV / div (ac coupled)
I
Time = 200 nsec / div
SWA = 5 V / div
SWB = 5 V / div
V = 50 mV / div (ac coupled)
I
Time = 200 nsec / div
SWA = 5 V / div
SWB = 5 V / div
www.ti.com Test Setup and Results
11
SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
Figure 11. TPS54A20EVM-770 Input Ripple, 5 A Load
Figure 12. TPS54A20EVM-770 Input Ripple, 10 A Load

Time = 2 msec / div
EN = 1 V / div
V = 500 mV / div
O
V = 10=0 V / div
IN
Time = 2 msec / div
EN = 1 V / div
V = 500 mV / div
O
V = 10=0 V / div
IN
Test Setup and Results www.ti.com
12 SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback
Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
2.9 Powering Up
Figure 13 and Figure 14 show the start-up waveforms for the TPS54A20EVM-770. In Figure 13, the output
voltage ramps up as soon as the input voltage reaches the UVLO threshold as set by the R2 and R3
resistor divider network. In Figure 14, the input voltage is initially applied and the output is inhibited by
using a jumper at J2 to tie EN to GND. When the jumper is removed, EN is released. When the EN
voltage reaches the enable-threshold voltage, the start-up sequence begins and the output voltage ramps
up to the externally set value of 1.2 V. The input voltage for these plots is 12 V and the load is 1 Ω.
Figure 13. TPS54A20EVM-770 Start-Up Relative to VIN
Figure 14. TPS54A20EVM-770 Start-Up Relative to Enable

Maximum Case Temperature = 76.3 °C
www.ti.com Test Setup and Results
13
SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
2.10 Thermal Image
The EVM thermal image is shown in Figure 15. The input voltage is 12 V and the output current is 10A.
The EVM was allowed to operate at full 10 A load for > 45 minutes before the image was captured.
Figure 15. Thermal Image

Board Layout www.ti.com
14 SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback
Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
3 Board Layout
This section provides a description of the TPS54A20EVM-770 board layout and layer illustrations.
3.1 Layout
The board layout for the TPS54A20EVM-770 is shown in Figure 16 through Figure 20. The top-side layer
of the EVM is laid out in a manner typical of a user application. The top, bottom, and internal layers are 2-
oz. copper.
The top layer contains the main power traces for VIN, VOUT, SWA and SWB. Also on the top layer are
connections for the remaining pins of the TPS54A20 and a large area filled with ground. The internal
layer-1 is dedicated ground plane. The internal layer-2 contain an additional large ground copper area as
well as an additional VOUT copper fill. The bottom layer is another ground plane with an additional trace for
the output voltage feedback. The top-side ground traces are connected to the bottom and internal ground
planes with multiple vias placed around the board including five vias directly under the TPS54A20 device
to provide a thermal path from the top-side ground plane to the bottom-side ground plane.
The input decoupling capacitors and bootstrap capacitor are all located as close to the IC as possible.
Additionally, the voltage setpoint resistor divider components are kept close to the IC. The voltage divider
network ties to the output voltage at the point of regulation, the copper VOUT trace at the TP7 test point. For
the TPS54A20, an additional input bulk capacitor may be required, depending on the EVM connection to
the input supply. Critical analog circuits such as the voltage set point divider, frequency set resistor, and
compensation components are terminated to ground using a wide ground trace separate from the power
ground pour.
Figure 16. TPS54A20EVM-770 Top-Side Assembly Figure 17. TPS54A20EVM-770 Top-Side Layout

www.ti.com Board Layout
15
SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
Figure 18. TPS54A20EVM-770 Internal Layer-1 Layout Figure 19. TPS54A20EVM-770 Internal Layer-2 Layout
Figure 20. TPS54A20EVM-770 Bottom-Side Layout

4
7,8
1,2,3
5,6,
Q1
0.02
R12
0.02
R13
TP8
TP10
TP7
TP9
1
2
J4
PGND
PGND
VG+
TON
VGA
SWB
BTB
BTA
0
R10
22.1k
R5
SWA
100uF
6.3V
C11
DNP
100uF
6.3V
C12
DNP
3.32k
R8
22pF
50V
C8
SSFSEL
ILIM
FB
PGOOD
SYNC
EN
47uF
25V
C23
DNP
PGND
PGND
1
2
J1
47uF
25V
C22
DNP
VIN
PGND
TP1
TP2
TP5
TP6
1uF
10V
C4
0.047uF
10V
C5
0.047uF
10V
C7
1uF
16V
C3
22.1k
R4
DNP
2.2uF
16V
C6
AGND
AGND
1
2
J3
47.0k
R1
DNP
TP4
TP11
TP12
22uF
35V
C24
10uF
25V
C2
220nH
L1
220nH
L2
10uF
25V
C1
51.1
R11
TP3
47.5k
R6
VG+
1
2
J2
80.6k
R2
12.4k
R3
14.3k
R7
20.0k
R9
47uF
10V
C9
47uF
10V
C10
TPS54A20RNJR
VIN
3
PGOOD
15
SYNC
14
SS/FSEL
6
EN
4
ILIM
5
VGA
7
TON
19
VG+
16
VG-
17
AGND
1PGND 2
FB 18
SWB 12
BOOTB 10
SWA 13
SCAP 20
SCAP 9
BOOTA 8
NC 11
U1
SCAP
PGND
AGND
TP13
Vin = 9.2 V - 14 V
Vout = 1.2 V, 10 A
Copyright © 2017, Texas Instruments Incorporated
Schematic and Bill of Materials www.ti.com
16 SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback
Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
4 Schematic and Bill of Materials
This section presents the TPS54A20EVM-770 schematic and bill of materials.
4.1 Schematic
Figure 21 is the schematic for the TPS54A20EVM-770.
Figure 21. TPS54A20EVM-770 Schematic

www.ti.com Schematic and Bill of Materials
17
SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
4.2 Bill of Materials
Table 4 presents the bill of materials for the TPS54A20EVM-770.
Table 4. TPS54A20EVM-770 Bill of Materials
Designator Quantity Value Description Package Part Number Manufacturer
PCB 1 Printed Circuit Board PWR770 Any
C1, C2 2 10uF CAP, CERM, 10 uF, 25 V, +/- 20%, X5R, 0603 0603 C1608X5R1E106M080AC TDK
C3 1 1uF CAP, CERM, 1 uF, 16 V, +/- 10%, X7R, 0603 0603 C1608X7R1C105K080AC TDK
C4 1 1uF CAP, CERM, 1 uF, 10 V, +/- 10%, X5R, 0402 0402 GRM155R61A105KE15D MuRata
C5, C7 2 0.047uF CAP, CERM, 0.047 uF, 10 V, +/- 10%, X5R, 0402 0402 C1005X5R1A473K050BA TDK
C6 1 2.2uF CAP, CERM, 2.2 uF, 16 V, +/- 10%, X7R, 1206 1206 GRM31MR71C225KA35L MuRata
C8 1 22pF CAP, CERM, 22 pF, 50 V, +/- 5%, C0G/NP0, 0603 0603 06035A220JAT2A AVX
C9, C10 2 47uF CAP, CERM, 47 uF, 10 V, +/- 20%, X5R, 0805 0805 GRM21BR61A476ME15 MuRata
C24 1 22uF CAP, CERM, 22 uF, 35 V, +/- 20%, X5R, 0805 0805 C2012X5R1V226M125AC TDK
J1, J4 2 Terminal Block, 5.08 mm, 2x1, Brass, TH 2x1 5.08 mm Terminal Block ED120/2DS On-Shore Technology
J2, J3 2 Header, 100mil, 2x1, Gold, TH Header, 100mil, 2x1, TH HTSW-102-07-G-S Samtec
L1, L2 2 220nH Inductor, 220 nH, 7.2 A, 0.0075 ohm, SMD 3.2x2.5mm MLA-FY12NR22N-M3-RU Mag Layers
Q1 1 30V MOSFET, N-CH, 30 V, 65 A, DQJ0008A (VSONP-8) DQJ0008A CSD17527Q5A Texas Instruments
R2 1 80.6k RES, 80.6 k, 1%, 0.1 W, 0603 0603 CRCW060380K6FKEA Vishay-Dale
R3 1 12.4k RES, 12.4 k, 1%, 0.1 W, 0603 0603 CRCW060312K4FKEA Vishay-Dale
R5 1 22.1k RES, 22.1 k, 1%, 0.1 W, 0603 0603 RC0603FR-0722K1L Yageo America
R6 1 47.5k RES, 47.5 k, 1%, 0.1 W, 0603 0603 RC0603FR-0747K5L Yageo America
R7 1 14.3k RES, 14.3 k, 1%, 0.1 W, 0603 0603 CRCW060314K3FKEA Vishay-Dale
R8 1 3.32k RES, 3.32 k, 1%, 0.1 W, 0603 0603 CRCW06033K32FKEA Vishay-Dale
R9 1 20.0k RES, 20.0 k, 1%, 0.1 W, 0603 0603 CRCW060320K0FKEA Vishay-Dale
R10 1 0 RES, 0, 5%, 0.1 W, 0603 0603 ERJ-3GEY0R00V Panasonic
R11 1 51.1 RES, 51.1, 0.1%, 0.1 W, 0603 0603 RT0603BRD0751R1L Yageo America
R12, R13 2 0.02 RES, 0.02, 1%, 3 W, 2512 2512 CRA2512-FZ-R020ELF Bourns
SH-J1 1 1x2 Shunt, 100mil, Gold plated, Black Shunt SNT-100-BK-G Samtec
TP1, TP7, TP11 3 Test Point, Multipurpose, Red, TH Red Multipurpose Testpoint 5010 Keystone
TP2, TP8, TP10, TP12,
TP13 5 Test Point, Multipurpose, Black, TH Black Multipurpose Testpoint 5011 Keystone
TP3 1 Test Point, Multipurpose, Blue, TH Blue Multipurpose Testpoint 5127 Keystone
TP4 1 Test Point, Multipurpose, Orange, TH Orange Multipurpose
Testpoint 5013 Keystone
TP5 1 Test Point, Multipurpose, Yellow, TH Yellow Multipurpose
Testpoint 5014 Keystone
TP6 1 Test Point, Multipurpose, Brown, TH Brown Multipurpose
Testpoint 5125 Keystone

Schematic and Bill of Materials www.ti.com
18 SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback
Copyright © 2015–2019, Texas Instruments Incorporated
TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
Table 4. TPS54A20EVM-770 Bill of Materials (continued)
Designator Quantity Value Description Package Part Number Manufacturer
TP9 1 Test Point, Multipurpose, White, TH White Multipurpose
Testpoint 5012 Keystone
U1 1 Small, 10MHz 10A, 8V to 14V Input, SWIFT Series Capacitor
Step-Down Converter, RNJ0020A (VQFN-HR-20) RNJ0020A TPS54A20RNJR Texas Instruments
C11, C12 0 100uF CAP, CERM, 100 uF, 6.3 V, +/- 20%, X5R, 1206 1206 JMK316BJ107ML-T Taiyo Yuden
C22, C23 0 47uF CAP, CERM, 47 uF, 25 V, +/- 20%, X5R, 1206_190 1206_190 C3216X5R1E476M160AC TDK
R1 0 47.0k RES, 47.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0747KL Yageo America
R4 0 22.1k RES, 22.1 k, 1%, 0.1 W, 0603 0603 RC0603FR-0722K1L Yageo America

www.ti.com Revision History
19
SLVUAM8A–December 2015–Revised March 2019
Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated
Revision History
Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (December 2015) to A Revision ................................................................................................ Page
• Changed 1 kΩto 14.3 kΩ................................................................................................................ 4
• Updated Figure 6.......................................................................................................................... 8
• Updated Figure 16 through Figure 20................................................................................................. 14
• Updated Figure 21....................................................................................................................... 16
• Updated Table 4......................................................................................................................... 17

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.