Texas Instruments TPS65320C-Q1-EVM User manual

SLVUAQ5–April 2016

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

Introduction

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Figure 1. EVM Board

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Setup and Operation

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TPS65320C-Q1-EVM User Guide

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

Setup and Operation

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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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Setup and Operation

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TPS65320C-Q1-EVM User Guide

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.

Board Layout

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Figure 5. Top Assembly Layer

Figure 6. Top Layer Routing

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Board Layout

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TPS65320C-Q1-EVM User Guide

Figure 7. Bottom Layer Routing (Flipped)

0.1µF

1µF

49.9

0.1µF

C12

95.3k

49.9

10µF

C11

GND

3300pF

C15

DNP

GND

DNPL2

DNP

2.2µF

GND

47µF

C10

GND

0.1µF

4.7µF

Vin

Vout_Buck

GND

10pFC6

220k

R10

66.5k

R12

150k

R11

2.4k

GND

nRST

LDO_FB

LDO_PM Buck_FB

Buck_PM

COMP

Gnd1 Gnd1

VBAT_BUCK

VBAT_GND

Vout_BUCK

BUCK_GND

GND GND

Vout_LDO

LDO_IN

100µF

VBAT_BUCK = 6 - 36 V

Vout_LDO = 3.3 V

Iout_max = 280 mA

Vout_Buck = 5 V

Iout_max = 3.2 A

JP4

49.9

1.6MHz / EXT

2.0MHz

2.2MHz

3.3µH

OFF

Vout_Buck

GND

LDO_GND

LDO_EN BUCK_EN

JP3

JP2

95.3k

18.2k

30.1k

28.0k

10pF

C14

BOOT 1

VIN

VIN_LDO

LDO_OUT 4

FB2 5

RST 6

EN2

EN1

RT/CLK

FB1 11

COMP

GND 13

SW 14

EP 15

TPS65320QPWPRQ1

JP1

LDO_IN

VIN_LDO

5600pF

C13

(MAX 20V!)

Vout_Buck

1.5k

R13

D2 DNP

Schematic

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4 Schematic

Figure 8. TPS65320C-Q1-EVM Schematic

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Bill of Materials

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TPS65320C-Q1-EVM User Guide

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

Revision History

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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

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