Texas Instruments TPS65320C-Q1-EVM User manual

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TPS65320C-Q1-EVM User Guide
PowerPAD is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
User's Guide
SLVUAQ5–April 2016
TPS65320C-Q1-EVM User Guide
The TPS65320C-EVM is a fully assembled PCB design for evaluation of TPS65320C-Q1, a switch mode
DC-to-DC step-down converter with an integrated low-dropout voltage regulator (LDO).
Contents
1 Introduction ................................................................................................................... 1
2 Setup and Operation ........................................................................................................ 3
3 Board Layout ................................................................................................................. 5
4 Schematic..................................................................................................................... 8
5 Bill of Materials............................................................................................................... 9
6 Revision History ............................................................................................................ 10
List of Figures
1 EVM Board ................................................................................................................... 2
2 RT Jumper Settings ......................................................................................................... 3
3 Enable Jumper Settings..................................................................................................... 4
4 VIN_LDO Jumper............................................................................................................ 4
5 Top Assembly Layer......................................................................................................... 6
6 Top Layer Routing........................................................................................................... 6
7 Bottom Layer Routing (Flipped)............................................................................................ 7
8 TPS65320C-Q1-EVM Schematic.......................................................................................... 8
List of Tables
1 Device and Package Configurations ...................................................................................... 1
2 Terminal Descriptions ....................................................................................................... 3
3 Regulator Configuration..................................................................................................... 5
1 Introduction
The Texas Instruments TPS65320C-EVM evaluation module (EVM) helps designers evaluate the
operation and performance of the TPS65320C-Q1, a switch-mode DC-to-DC step-down converter with an
integrated low-dropout voltage regulator (LDO). This document describes how to setup and configure the
EVM for operation. The document also provides the board layout, schematic, and bill of materials for the
EVM. See Table 1 and Figure 1.
Table 1. Device and Package Configurations
CONVERTER IC PACKAGE
U1 TPS65320CQPWPRQ1 HTSSOP-14

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Figure 1. EVM Board

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2 Setup and Operation
This section describes the jumpers and connectors on the EVM as well and how to properly connect, set
up and use the TPS65320C-EVM.
2.1 Input and Output Connectors
The EVM terminal descriptions are in Table 2.
Table 2. Terminal Descriptions
TERMINAL DIRECTION DESCRIPTION
VBAT Input This terminal is the power input terminal for the device. Adjacent to this terminal is the VBAT_GND reference ground. Use these
terminals to attach the EVM to a cable harness.
Vout_BUCK Output This terminal is the output terminal for the TPS65320C-Q1
switch-mode regulator. Adjacent to this terminal is the
BUCK_GND reference ground, which is closely coupled with the
VBAT_GND.
Vout_LDO Output This terminal is the output terminal for the TPS65320C-Q1
switch-mode regulator. Adjacent to this terminal is the
BUCK_GND reference ground, which is closely coupled with the
VBAT_GND.
2.2 Jumper Settings
2.2.1 JP4
JP4 is the jumper for selecting the operating switching frequency for the switch-mode regulator. The
jumper will enable the pull-down resistor to set the frequency to approximately 1.6 MHz, 2.0 MHz, or 2.2
MHz, see Figure 2. To apply an external clock, use the bottom pin for the GND connection. In case no
jumper is set, the part defaults to 1.6 MHz.
Figure 2. RT Jumper Settings

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2.2.2 BUCK_EN and LDO_EN
BUCK_EN (JP2) and LDO_EN (JP3) are the jumpers (Figure 3) for enabling the switch-mode converter,
respectively the LDO. The rail will be enabled when the respective jumper is high, and disabled when low.
NOTE: Manual installation may cause ringing, potentially asserting nRST low. A power-cycle is
required if this happens. Please use a signal generator to drive the Enable-pins to avoid this.
Figure 3. Enable Jumper Settings
2.2.3 JP1 (VIN_LDO)
VIN_LDO (JP1) selects the input supply for the LDO, see Figure 4. If the jumper is installed, the LDO is
supplied from the Buck output, as long as the Buck is enabled. If the Buck should be disabled, the Auto-
source function of the TPS65320C-Q1 will automatically use VIN as LDO-supply. Alternatively, another
source could be used to supply the VIN_LDO-pin. This source must not exceed a maximum 20 V and also
must be smaller or equal to VIN. For proper LDO-usage, do not leave VIN_LDO unsupplied.
Figure 4. VIN_LDO Jumper
2.3 Test Points
The following list includes all test points with a short description:
•Gnd1 — This test point is Ground
•BUCK_PM — This test point allows easy access for Gain-Phase-Analysis for BUCK
•BUCK_FB — This test point is for feedback-divider input for BUCK
•SW — This is the Buck phase pin
•SS — This is the soft-start and tracking pin
•COMP — This is for compensation of Buck
•LDO_PM — This test point allows easy access for gain-phase-analysis for LDO
•LDO_FB — This test point is for the feedback-divider input for LDO
•nRST — This is the reset output for LDO

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2.4 Operation
The input voltage range for the converter is 4 V to 40 V. Since the Buck configuration is for a 5 V output, a
higher voltage (approximately 6 V minimum) needs to be applied for normal performance. Also, the part
has an initial start-up-voltage of 6 V minimum, so even if the board is modified for lower-output voltages,
at first power-on, a supply-voltage of a minimum of 6 V needs to be applied once, before it can be
lowered.
For proper operation of the TPS65320C-Q1-EVM, properly configure BUCK_EN, LDO_EN, VIN_LDO, and
J6 using the jumper terminals as follows.
• BUCK_EN – enabled (left)
• LDO_EN – enabled (left)
• JP4 - 2.0 MHz (R10)
• VIN_LDO - installed
In this configuration, both regulators will turn on when power is applied. Disable regulators by moving the
enable jumpers to the right. If the BUCK is disabled, the LDO is supplied from VIN, consider the power-
dissipation at high VIN, VIN_LDO will be at GND-level in this condition. To change the switching
frequency, power-down the device before moving the jumper. To apply an external clock, install jumpers
to set the frequency to the set-point closest to the external clock. In case of a loss of the external clock,
the part falls back to the frequency created by the jumpers.
Configure the regulator using to the following settings in Table 3.
Table 3. Regulator Configuration
REGULATOR OUTPUT VOLTAGE MAXIMUM OUTPUT CURRENT
BUCK 5 V 3.2 A
LDO 3.3 V 0.28 A
NOTE: The output capacitors of the BUCK regulator are 25-V types, supporting up to 18 V of Vout.
In case of higher output voltage, the recommendation is to replace those with capacitors
providing higher-voltage ratings.
At low-switching frequencies, high load-transients and limited allowed deviation of Vout, larger
capacitance-values may be required. If needed, use the footprints of the unassembled electrolytic
capacitors C9 and C10. Low-ESR-capacitors will also further reduce the coupled noise from the buck to
the LDO.
On the EVM, a soft-start capacitor (C6) of 3.3 nF is installed, setting the time to approximately 1 ms. For
other soft-start times, the capacitor may be replaced.
3 Board Layout
Figure 5,Figure 6, and Figure 7 show the board layout for the TPS65320C-Q1-EVM. The EVM offers
resistors and jumpers to program the switching frequency. Jumpers are also provided to enable the
individual regulators.
The TPS65320C-Q1 converter offers high efficiency, but does dissipate power. The PowerPAD™ package
offers an exposed thermal pad to enhance thermal performance. This must be soldered to the copper
landing on the PCB, which is preferably connected to the GND-plane with multiple thermal vias for optimal
performance.

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Figure 5. Top Assembly Layer
Figure 6. Top Layer Routing

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Figure 7. Bottom Layer Routing (Flipped)

0.1µF
C1
1µF
C7
49.9
R2
0.1µF
C12
95.3k
R3
49.9
R1
10µF
C11
GND
GND
GND
GND
GND
3300pF
C15
DNP
C8
DNP
GND
GND
DNPL2
DNP
2.2µF
C2
GND
47µF
C9
47µF
C10
GND
0.1µF
C4
4.7µF
C5
Vin
Vout_Buck
GND
D1
GND
GND
10pFC6
220k
R10
66.5k
R12
150k
R11
2.4k
R9
GND
SW
nRST
LDO_FB
LDO_PM Buck_FB
Buck_PM
SS
COMP
Gnd1 Gnd1
VBAT_BUCK
VBAT_GND
Vout_BUCK
BUCK_GND
GND GND
Vout_LDO
LDO_IN
100µF
C3
VBAT_BUCK = 6 - 36 V
Vout_LDO = 3.3 V
Iout_max = 280 mA
Vout_Buck = 5 V
Iout_max = 3.2 A
12
34
56
JP4
49.9
R8
1.6MHz / EXT
2.0MHz
2.2MHz
3.3µH
L1
ON
OFF
ON
OFF
Vout_Buck
GND
LDO_GND
LDO_EN BUCK_EN
1
2
3
JP3
1
2
3
JP2
95.3k
R4
18.2k
R6
30.1k
R5
28.0k
R7
10pF
C14
BOOT 1
VIN
2
VIN_LDO
3
LDO_OUT 4
FB2 5
RST 6
EN2
7
EN1
8
RT/CLK
9
SS
10
FB1 11
COMP
12
GND 13
SW 14
EP 15
U1
TPS65320QPWPRQ1
1
2
JP1
LDO_IN
VIN_LDO
5600pF
C13
(MAX 20V!)
Vout_Buck
1.5k
R13
D2 DNP
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4 Schematic
Figure 8. TPS65320C-Q1-EVM Schematic

www.ti.com Bill of Materials
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5 Bill of Materials
(1) Unless otherwise noted in the Alternate Part Number and/or Alternate Manufacturer columns, all parts may be substituted with equivalents.
DESIGNATOR QUANTITY VALUE DESCRIPTION PACKAGE
REFERENCE PART NUMBER MANUFACTURER ALTERNATE PART NUMBER(1) ALTERNATE MANUFACTURER
!PCB 1 Printed Circuit Board HVL144 Any – –
C1, C4, C12 3 0.1uF CAP, CERM, 0.1 µF, 100
V, ±10%, X7R, 0805 0805 C0805C104K1RACTU Kemet
C2 1 2.2uF CAP, CERM, 2.2 µF, 100
V, ±10%, X7R, 1210 1210 C1210C225K1RACTU Kemet
C3 1 100uF CAP, AL, 100 µF, 63 V,
±20%, 0.35 ohm, SMD SMT Radial G EEE-FK1J101P Panasonic N/A N/A
C5 1 4.7uF CAP, CERM, 4.7 µF, 100
V, ±20%, X7R, 2220 2220 C5750X7R2A475M TDK
C6 1 10pF CAP, CERM, 10 pF, 50 V,
±5%, C0G/NP0, 0603 0603 C0603C100J5GACTU Kemet
C7 1 1uF CAP, CERM, 1 µF, 50 V,
±10%, X7R, 0805 0805 GRM21BR71H105KA12L MuRata
C9, C10 2 47uF CAP, CERM, 47 µF, 25 V,
±20%, X7S, 6x5x5mm 6x5x5mm CKG57NX7S1E476M500JH TDK N/A N/A
C11 1 10uF CAP, CERM, 10 µF, 16 V,
±10%, X7S, AEC-Q200
Grade 1, 0805
0805 GCM21BC71C106KE36L MuRata
C13 1 5600pF CAP, CERM, 5600 pF,
100 V, ±5%, X7R, 0603 0603 06031C562JAT2A AVX
C14 1 10pF CAP, CERM, 10 pF, 50 V,
± 5%, C0G/NP0, 0603 0603 06035A100JAT2A AVX
C15 1 3300pF CAP, CERM, 3300 pF,
100 V, ± 5%, X7R, 0603 0603 06031C332JAT2A AVX
D1 1 40V Diode, Schottky, 40 V, 4
A, SMC SMC SL44-E3/57T Vishay- Semiconductor N/A N/A
H1, H2, H3, H4 4 Bumpon, Hemisphere,
0.44 X 0.20, Clear Transparent Bumpon SJ-5303 (CLEAR) 3M
JP1 1 Header, 2.54 mm, 2x1,
Gold, TH Header, 2.54 mm, 2x1, TH GBC02SAAN Sullins Connector Solutions
JP2, JP3 2 1x3 Header, 100mil, 3x1,
Gold, TH PBC03SAAN PBC03SAAN Sullins Connector Solutions
JP4 1 Header, 100mil, 3x2,
Gold, TH Sullins 100mil, 2x3, 230 mil above insulator PBC03DAAN Sullins Connector Solutions
L1 1 3.3uH Inductor, Shielded,
Composite, 3.3 µH, 5.5 A,
0.026 ohm, SMD
4.0x3.1x4.0mm XAL4030-332MEB Coilcraft N/A N/A
R1, R2, R8 3 49.9 RES, 49.9, 1%, 0.1 W,
0603 0603 CRCW060349R9FKEA Vishay-Dale
R3, R4 2 95.3k RES, 95.3 k, 1%, 0.1 W,
0603 0603 CRCW060395K3FKEA Vishay-Dale

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DESIGNATOR QUANTITY VALUE DESCRIPTION PACKAGE
REFERENCE PART NUMBER MANUFACTURER ALTERNATE PART NUMBER(1) ALTERNATE MANUFACTURER
R5 1 30.1k RES, 30.1 k, 1%, 0.1 W,
0603 0603 CRCW060330K1FKEA Vishay-Dale
R6 1 18.2k RES, 18.2 k, 1%, 0.1 W,
0603 0603 CRCW060318K2FKEA Vishay-Dale
R7 1 28.0k RES, 28.0 k, 1%, 0.1 W,
0603 0603 CRCW060328K0FKEA Vishay-Dale
R9 1 2.4k RES, 2.4 k, 5%, 0.1 W,
0603 0603 CRCW06032K40JNEA Vishay-Dale
R10 1 220k RES, 220 k, 1%, 0.1 W,
0603 0603 RC0603FR-07220KL Yageo America
R11 1 150k RES, 150 k, 1%, 0.1 W,
0603 0603 CRCW0603150KFKEA Vishay-Dale
R12 1 66.5k RES, 66.5 k, 1%, 0.1 W,
0603 0603 CRCW060366K5FKEA Vishay-Dale
R13 1 1.5k RES, 1.5 k, 5%, 0.1 W,
0603 0603 CRCW06031K50JNEA Vishay-Dale
SH-JP1, SH-JP2, SH-
JP3, SH-JP4 4 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M SNT-100-BK-G Samtec
TP1, TP12, TP13,
TP14, TP15, TP16 6 PCB Pin, Swage Mount, TH PCB Pin(2505-2) 2505-2-00-44-00-00-07-0 Mill-Max
TP2, TP3, TP4, TP5,
TP6, TP7, TP8, TP9,
TP10, TP11
10 SMT Test Point, Miniature,
SMT Testpoint_Keystone _Miniature 5015 Keystone
U1 1 40-V Step-Down
Converter With Eco-mode
and LDO Regulator,
PWP0014E
PWP0014E TPS65320QPWPRQ1 Texas Instruments
C8 0 47uF CAP, AL, 47 µF, 80 V,
±20%, 0.7 ohm, SMD SMT Radial G EEE-FK1K470P Panasonic
D2 0 40V Diode, Schottky, 40 V, 0.2
A, SOT-23 SOT-23 BAS40-7-F Diodes Inc.
FID1, FID2, FID3,
FID4, FID5, FID6 0 Fiducial mark. There is nothing to buy or mount. Fiducial N/A N/A
L2 0 10uH Inductor, Shielded,
Ferrite, 10 µH, 5.8 A,
0.019 ohm, SMD
12.5x12.5mm B82477P4103M000 TDK
6 Revision History
DATE REVISION NOTES
April 2016 * Initial Release