Texas Instruments LM63625EVM User manual

1
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LM63625EVM EVM User’s Guide
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User's Guide
SNVU599A–February 2019–Revised October 2019
LM63625EVM EVM User’s Guide
The Texas Instruments LM63625EVM evaluation module (EVM) helps designers evaluate the operation
and performance of the LM63625-Q1 buck regulator. The LM63625-Q1 is a family of easy-to-use
synchronous step-down DC/DC converters capable of driving up to 2.5 A of load current from an input
voltage of 3.5 V to 36 V. The LM63625EVM features a selectable output voltage of 3.3 V or 5 V and a
switching frequency of 2.1 MHz . See the LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A Automotive Step-
down Voltage Converter Data Sheet for additional features, detailed description, and available options.
The EVM options are found in Table 1.
Table 1. Device and Package Configurations
EVM DEVICE FREQUENCY/OUTPUT
CURRENT
LM63625EVM LM63625DQPWPRQ1 2100 kHz / 2.5 A
Contents
1 Setup .......................................................................................................................... 3
2 Operation ..................................................................................................................... 6
3 Performance Curves ........................................................................................................ 6
4 Schematic..................................................................................................................... 9
5 Board Layout................................................................................................................ 10
6 Bill of Materials ............................................................................................................. 13
List of Figures
1 EVM Board Connections.................................................................................................... 3
2 EVM Card Edge Connections.............................................................................................. 4
3 Jumper Locations............................................................................................................ 4
4 FRA Setup.................................................................................................................... 5
5 Efficiency Without Input Filter AUTO Mode, VOUT = 3.3V, fSW = 2.1 MHz............................................. 6

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6 Efficiency Without Input Filter AUTO Mode, VOUT = 5 V, fSW = 2.1 MHz .............................................. 6
7 Load Transient 12 VIN, 3.3 VOUT, 0 A to 1 A, COUT = 2 × 22 µF , IOUT Slew Rate = 1 A/µs........................... 6
8 Load Transient 12 VIN, 3.3 VOUT, 0.1 A to 1 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs......................... 6
9 Load Transient 12 VIN, 3.3 VOUT, 0 A to 2.5 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs......................... 6
10 Load Transient 2 VIN, 3.3 VOUT, 0.1 A to 2.5 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs ........................ 6
11 Load Transient 12 VIN, 5 VOUT, 0 A to 1 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs.............................. 7
12 Load Transient 2 VIN, 5 VOUT, 0.1 A to 1 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs............................. 7
13 Load Transient 12 VIN, 5 VOUT, 0 A to 2.5 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs ........................... 7
14 Load Transient 2 VIN, 5 VOUT, 0.1 A to 2.5 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs........................... 7
15 Output Voltage Ripple Auto Mode 2 VIN, 3.3 VOUT, 0 A.................................................................. 7
16 Output Voltage Ripple Auto Mode 2 VIN, 5 VOUT, 0 A.................................................................... 7
17 IC Temperature = 48.2°C 2 VIN, 3.3 VOUT, IOUT = 2.5 A, fSW = 2.1 MHz ................................................ 8
18 IC Temperature = 49.1°C 2 VIN, 5 VOUT, IOUT = 2.5 A, fSW = 2.1 MHz .................................................. 8
19 LM63625EVM Schematic................................................................................................... 9
20 Top View of EVM........................................................................................................... 10
21 EVM Top Copper Layer ................................................................................................... 11
22 EVM Mid Layer One ....................................................................................................... 11
23 EVM Mid Layer Two ....................................................................................................... 12
24 EVM Bottom Copper Layer ............................................................................................... 12
List of Tables
1 Device and Package Configurations ...................................................................................... 1
2 BOM for LM63625EVM.................................................................................................... 13
Trademarks
All trademarks are the property of their respective owners.

Load
(+)
(-)
Input
Supply
(-)
(+)
DMM
(-) (+)
DMM
(-) (+)
www.ti.com Setup
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SNVU599A–February 2019–Revised October 2019
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LM63625EVM EVM User’s Guide
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1 Setup
This section describes the test points and connectors on the EVM and how to properly connect, set up,
and use the LM63625EVM . Either the test points on the top of the board or the card edge connector can
be used for connections. See Figure 1 for the top of board connections and Figure 2 for the card edge
connections. The following lists the functions of the connections:
VIN_EMI— Input supply to EVM. Connect to a suitable input supply. See the LM636x5-Q1 3.5-V to 36-V,
1.5-A, and 2.5-A Automotive Step-down Voltage Converter Data Sheet for input supply
requirements.
GND— System ground
VOUT— Output of EVM. Connect to desired load.
VOUTS— Output voltage sense connection (do not use for current; sense only)
VINS— Input voltage sense connection (do not use for current; sense only)
GNDS— Ground sense point for analog measurements (do not use for current; sense only)
Figure 1. EVM Board Connections

5V or 3.3V
Output Voltage
Selection Jumper
FPWM or Auto
Selection Jumper
GND VOUT
GNDS
VOS
TOP FRONT
BOTTOM FRONT
VIS
VIN
Load
(+)(-)
Input
Supply (-)(+)
DMM (-)(+) DMM
(-) (+)
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Figure 2. EVM Card Edge Connections
1.1 Jumpers
See Figure 3 for jumper locations.
•J1 This jumper allows the VOUT_SEL pin input to be connected to either VCC or GND for a fixed
output voltage selection of 3.3 V or 5 V, respectively. Alternatively, the jumper can be left open and a
RVOUTSEL can be populated with 10 kΩto have the part operate with an adjustable output voltage. See
the LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A Automotive Step-down Voltage Converter Data Sheet
for feedback resistor calculation.
•J2 This jumper allows SYNC to be connected in this mode to either VCC or GND. When connected to
VCC, the part operates in forced pulse width modulation (FPWM) mode and when the SYNC pin is
connected to GND, the part operates in auto mode where pulse frequency modulation (PFM) is
engaged.
Figure 3. Jumper Locations

OSC
BA
Signal
Injection
^_/v‰µšš}
network analyzer
^_/v‰µšš}
network analyzer
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1.2 Test Points
•VIN_EMI - Input supply to EVM. Connect to a suitable input supply. See the LM636x5-Q1 3.5-V to 36-
V, 1.5-A, and 2.5-A Automotive Step-down Voltage Converter Data Sheet for input supply
requirements.
•GND - System power ground
•VOUT - Power output of EVM. Connect to desired load.
•VOUTS - Output voltage sense connection. Connect to DMM. It is also used for frequency response
analyzer connection (do not use for current; sense only).
•VINS - Input voltage sense connection. Connect to DMM (do not use for current; sense only).
•GNDS - Ground sense point for analog measurements. Connect to DMM (do not use for current; sense
only).
•EN - Connection for external EN logic input. Connect controlling logic to EN test point for external
enable control.
•RESET - Connected to the RESET pin of the IC. It is used as a flag output. The reset function can be
monitored at this test point. Pullup resistor, RPULLUP, must be populated. A typical value for pullup
resistor is 100 kΩ.
•SYNC - Connected to the SYNC pin of the IC. Connection to an external clock or synchronization
signal enables the IC switching frequency to follow the synchronization signal.
•TPGND1, TPGND2 - System power ground
•OPEN PADS - Connection for frequency response analyzer (on bottom of board). See Figure 4.
Figure 4. FRA Setup

VOUT (100 mV/div)
VIN (10 V/div)
IOUT (1 A/div)
Time = 200 µs/div
VOUT (50 mV/div)
VIN (10 V/div)
IOUT (1 A/div)
Time = 200 µs/div
Output Current (A)
Efficiency (%)
0.1 0.2 0.3 0.4 0.5 0.7 1 2 3
50
55
60
65
70
75
80
85
90
95
100
LM63
VIN = 12V
VIN = 24V
Output Current (A)
Efficiency (%)
0.1 0.2 0.3 0.4 0.5 0.7 1 2 3
50
55
60
65
70
75
80
85
90
95
100
LM63
VIN = 12V
VIN = 24V
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2 Operation
Once the above connections are made and the appropriate jumpers are set, the EVM is ready to use. The
EN pin is pulled up to VIN with a 100-kΩresistor.
The output voltage of the EVM can be selected by the VOUT jumper to either 3.3 V or 5 V. Other values
of output voltage can be programmed by removing the jumper on J1 before powering on the device and
changing the value of RFBT and RFBB on the EVM. In addition, it is possible that the values of the inductor
and the output capacitance need to be changed. See the LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A
Automotive Step-down Voltage Converter Data Sheet for more information.
The EVM has been designed for maximum flexibility regarding component selection. This allows the user
to place preferred components such as the inductor, the capacitors, or both, on the board and test the
performance of the regulator. This way the power supply system can be tested before committing the
design to production.
3 Performance Curves
Figure 5. Efficiency Without Input Filter
AUTO Mode, VOUT = 3.3V, fSW = 2.1 MHz Figure 6. Efficiency Without Input Filter AUTO Mode, VOUT = 5 V, fSW = 2.1 MHz
Figure 7. Load Transient 12 VIN, 3.3 VOUT, 0 A to 1 A,
COUT = 2 × 22 µF , IOUT Slew Rate = 1 A/µs Figure 8. Load Transient 12 VIN, 3.3 VOUT, 0.1 A to 1 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs

VOUT (500 mV/div)
VIN (10 V/div)
IOUT (1 A/div)
Time = 200 µs/div
VOUT (200 mV/div)
VIN (10 V/div)
IOUT (1 A/div)
Time = 200 µs/div
VOUT (200 mV/div)
VIN (10 V/div)
IOUT (1 A/div)
Time = 200 µs/div
VOUT (100 mV/div)
VIN (10 V/div)
IOUT (1 A/div)
Time = 200 µs/div
VOUT (200 mV/div)
VIN (10 V/div)
IOUT (1 A/div)
Time = 200 µs/div
VOUT (200 mV/div)
VIN (10 V/div)
IOUT (1 A/div)
Time = 200 µs/div
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Figure 9. Load Transient 12 VIN, 3.3 VOUT, 0 A to 2.5 A,
COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs Figure 10. Load Transient 2 VIN, 3.3 VOUT, 0.1 A to 2.5 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs
Figure 11. Load Transient 12 VIN, 5 VOUT, 0 A to 1 A,
COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs Figure 12. Load Transient 2 VIN, 5 VOUT, 0.1 A to 1 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs
Figure 13. Load Transient 12 VIN, 5 VOUT, 0 A to 2.5 A,
COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs Figure 14. Load Transient 2 VIN, 5 VOUT, 0.1 A to 2.5 A,
COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs

VOUT_AC_Coupled
(10 mV/div)
SW (10 V/div)
IOUT (1 A/div)
Time = 20 ms/div
VOUT_AC_Coupled
(10 mV/div)
SW (10 V/div)
IOUT (1 A/div)
Time = 20 ms/div
Performance Curves www.ti.com
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Figure 15. Output Voltage Ripple
Auto Mode 2 VIN, 3.3 VOUT, 0 A Figure 16. Output Voltage Ripple Auto Mode 2 VIN, 5 VOUT, 0 A
Figure 17. IC Temperature = 48.2°C
2 VIN, 3.3 VOUT, IOUT = 2.5 A, fSW = 2.1 MHz Figure 18. IC Temperature = 49.1°C 2 VIN, 5 VOUT, IOUT = 2.5 A, fSW = 2.1 MHz

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4 Schematic
Figure 19. LM63625EVM Schematic

CAUTION
Caution Hot surface.
Contact may cause burns.
Do not touch.
Board Layout www.ti.com
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5 Board Layout
Figure 20. Top View of EVM