Texas Instruments TPS62806-7-8EVM083 Manual de usuario

SLUUC01–January 2019

TPS62806-7-8EVM083 Evaluation Module

User's Guide

SLUUC01–January 2019

TPS62806-7-8EVM083 Evaluation Module

The TPS62806-7-8EVM083 (BSR083-001) facilitates the evaluation of the TPS6280x family of 600-mA,

step-down converters with 2.3-µA IQin tiny 1.05-mm by 0.7-mm WCSP packages with 0.35-mm pitch. The

EVM contains 3 separate circuits to create output voltages between 0.4 V and 3.3 V from higher input

voltages between 1.8 V and 5.5 V. All circuits have a maximum height of 1 mm. The TPS6280x is a highly

efficient and tiny solution for point-of-load (POL) converters for space-constrained applications, such as

wearables and smart phones.

Contents

1 Introduction ................................................................................................................... 2

2 Setup .......................................................................................................................... 4

3 TPS62806-7-8EVM083 Test Results...................................................................................... 5

4 Board Layout ................................................................................................................. 5

5 Schematic and List of Materials.......................................................................................... 10

List of Figures

1 Loop Response Measurement Modification.............................................................................. 3

2 TPS62808 Thermal Performance (VIN = 5 V, VOUT = 1.8 V, IOUT = 600 mA) .......................................... 5

3 Top Assembly................................................................................................................ 6

4 Top Layer..................................................................................................................... 7

5 Bottom Layer................................................................................................................. 8

6 TPS62806-7-8EVM083 Angled View ..................................................................................... 9

7 TPS62806-7-8EVM083 Overhead View.................................................................................. 9

8 TPS62806 Schematic...................................................................................................... 10

9 TPS62807 Schematic...................................................................................................... 10

10 TPS62808 Schematic...................................................................................................... 10

List of Tables

1 BSR083 Circuit Options..................................................................................................... 2

2 Performance Specification Summary ..................................................................................... 2

3 TPS62806 List of Materials ............................................................................................... 11

4 TPS62807 List of Materials ............................................................................................... 11

5 TPS62808 List of Materials ............................................................................................... 11

Trademarks

All trademarks are the property of their respective owners.

Introduction

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1 Introduction

The TPS6280x is a family of synchronous, step-down converters in a 1.05- × 0.7-mm wafer chip-scale

package (WCSP) with 0.35-mm pitch. The BSR083 EVM contains 3 completely independent circuits, each

for a different IC version. See Table 1 for a summary of the BSR083 EVMs.

The reference designator order is grouped together by sub-circuit. Reference designators beginning with

'1' (for example, R1x, J1x, C1x) are part of one sub-circuit. The second digit of each reference designator

is the same for the same component in different sub-circuits. R11, R21, and R31, for example, refer to the

same resistor in each sub-circuit.

Table 1. BSR083 Circuit Options

EVM Version IC Installed Output Voltage Setpoint

(VSEL/MODE = open at

startup)

Output Voltage

Setpoint (VSEL/MODE

= PFM at startup)

Output Voltage

Setpoint Range Output Current

TPS62806-7-8EVM083

(BSR083-001)

TPS62806 (U11) 0.6 V 0.7 V 0.4 - 0.775 V (adjustable) 600 mA

TPS62807 (U21) 0.9 V 1.2 V 0.8 - 1.55 V (adjustable) 600 mA

TPS62808 (U31) 3.3 V 1.8 V 1.8 - 3.3 V (adjustable) 600 mA

1.1 Performance Specification

Table 2 provides a summary of the TPS62806-7-8EVM083 performance specifications.

Table 2. Performance Specification Summary

SPECIFICATION MIN TYP MAX UNIT

Input voltage 1.8 3.6 5.5 V

Output voltage setpoint See Table 1 V

Output current 0 See Table 1 mA

1.2 Modifications

The printed-circuit board (PCB) for this EVM uses the adjustable output voltage versions of this integrated

circuit (IC). Additional input and output capacitors can also be added. Finally, the loop response of the IC

can be measured.

1.2.1 Adjusting the Output Voltage

The output voltage is adjusted though the choice of Rx1 and Rx2 resistors. Since Rx1 and Rx2 are in

parallel, only Rx1 or Rx2 should be installed at the same time. Rx1 is an 0201 size to represent a typical

final solution. However, such a small size is difficult to manually replace. Therefore, Rx2 is provided in an

0603 size to easily change the output voltage. Simply remove Rx1 and install Rx2 in the desired value.

Cut Trace as

Shown

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Introduction

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TPS62806-7-8EVM083 Evaluation Module

1.2.2 Input and Output Capacitors

Cx2 is provided for an additional input capacitor. This capacitor is not required for proper operation but

can be used to reduce the input voltage ripple.

Cx5, Cx6, and Cx7 are provided for additional output capacitors. These capacitors are not required for

proper operation but can be used to reduce the output voltage ripple and to improve the load transient

response. The total output capacitance must remain within the recommended range in the data sheet for

proper operation.

1.2.3 Loop Response Measurement

The loop response of the EVM can be measured with two simple changes to the circuitry. First, cut the

trace between the VOS pin and the output capacitor on the top layer. This change is shown in Figure 1.

Second, install a 10-Ωresistor across the resistor pads on the back of the PCB at Rx3. The pads are

spaced to allow installation of an 0603-sized resistor. With these changes, an ac signal (10-mV, peak-to-

peak amplitude recommended) can be injected into the control loop across the added resistor. Details of

measuring the control loop of DCS-Control devices are found in How to Measure the Control Loop of

DCS-Control™ Devices.

Figure 1. Loop Response Measurement Modification

Setup

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2 Setup

This section describes how to properly use the TPS62806-7-8EVM083.

2.1 Input/Output Connector Descriptions

Jx1, Pin 1 and 2 – VIN Positive input connection from the input supply for the EVM.

Jx1, Pin 3 and 4 – S+/S- Input voltage sense connections. Measure the input voltage at this point.

Jx1, Pin 5 and 6 – GND Input return connection from the input supply for the EVM.

Jx2, Pin 1 and 2 – VOUT Output voltage connection.

Jx2, Pin 3 and 4 – S+/S- Output voltage sense connections. Measure the output voltage at this point.

Jx2, Pin 5 and 6 – GND Output return connection.

JPx1 – VSEL/MODE

VSEL/MODE pin input jumper. Before startup, leave the jumper floating to

select the output voltage corresponding to the installed Rx1 or Rx2 value.

Alternatively, connect the jumper between VSEL/MODE and PFM to select

the output voltage corresponding to that shown in Table 1. After startup,

connect this jumper between VSEL/MODE and PFM to operate with highest

efficiency or between VSEL/MODE and PWM to operate with lowest ripple.

JPx2 – EN EN pin input jumper. Place the supplied jumper across ON and EN to turn

on the IC. Place the jumper across OFF and EN to turn off the IC.

NOTE: Changes to JPx1 during operation only affect the operating mode (PFM or PWM) and have

no effect on the output voltage. To achieve a different output voltage, it is required to disable

and re-enable the device.

2.2 Setup

To operate the EVM, set jumpers JPx1 and JPx2 to the desired position per Section 2.1. Connect the

input supply to Jx1 and connect the load to Jx2.

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TPS62806-7-8EVM083 Test Results

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TPS62806-7-8EVM083 Evaluation Module

3 TPS62806-7-8EVM083 Test Results

The TPS62806-7-8EVM083 was used to take all the data in TPS6280x 1.8-V to 5.5-V, 0.6A / 1-A, 2.3-μA

IQStep Down Converter in a 6 Pin, 0.35 mm Pitch WCSP Package. See the device data sheet for the

performance of this EVM.

Figure 2 shows the thermal performance of the EVM.

Figure 2. TPS62808 Thermal Performance (VIN =5V,VOUT = 1.8 V, IOUT = 600 mA)

4 Board Layout

This section provides the TPS62806-7-8EVM083 board layout and illustrations in Figure 3 through

Figure 5. The Gerbers are available on the EVM product page: TPS62806-7-8EVM083.

Board Layout

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Figure 3. Top Assembly

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Board Layout

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TPS62806-7-8EVM083 Evaluation Module

Figure 4. Top Layer

Board Layout

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Figure 5. Bottom Layer

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Board Layout

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TPS62806-7-8EVM083 Evaluation Module

Figure 6. TPS62806-7-8EVM083 Angled View

Figure 7. TPS62806-7-8EVM083 Overhead View

GND

S+

S-

VOUT

1.8V - 3.3V

VIN

1.8V to 5.5V

S+

S-

GND

VIN2

OFF

PWM

VSEL/MODE

PFM

GND2

VIN2

600mA

GND2

47uF

C33

4.7uF

C31

4.7uF

C32

DNP

VOUT2

4.7uF

C36

DNP

10uF

C37

DNP

10.0

R33

DNP

10uF

C34

10uF

C35

GND2

249k

R31

GND2

249k

R32

DNP

GND2

TPS62808YKAR

VOS A2

SW B2

VSEL/MODE

GND A1

VIN

U31

1µH

L31

J31

J32

JP31

JP32

GND

S+

S-

VOUT

0.8V - 1.55V

VIN

1.8V to 5.5V

S+

S-

GND

VIN1

OFF

PWM

VSEL/MODE

PFM

GND1

VIN1

600mA

GND1

47uF

C23

4.7uF

C21

4.7uF

C22

DNP

VOUT1

4.7uF

C26

DNP

10uF

C27

DNP

10.0

R23

DNP

10uF

C24

10uF

C25

DNP

GND1

15.4k

R21

15.4k

R22

DNP

TPS62807YKAR

VOS A2

SW B2

VSEL/MODE

GND A1

VIN

U21

1µH

L21

J21

J22

JP21

JP22

GND

S+

S-

VOUT

0.4V - 0.775V

VIN

1.8V to 5.5V

S+

S-

GND

VIN

OFF

PWM

VSEL/MODE

PFM

GND

VIN

600mA

GND

47uF

C13

4.7uF

C12

DNP

VOUT

4.7uF

C16

DNP

10uF

C17

DNP

10.0

R13

DNP

10uF

C15

DNP

GND

4.7uF

C11

1µH

L11

J11

JP11

VIN

TPS62806YKAR

VOS A2

SW B2

VSEL/MODE

GND A1

VIN

U11

56.2k

R11

56.2k

R12

DNP

10uF

C14 5

J12

JP12

Schematic and List of Materials

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5 Schematic and List of Materials

This section provides the TPS62806-7-8EVM083 schematic and List of materials.

5.1 Schematic

Figure 8 illustrates the TPS62806 EVM schematic.

Figure 8. TPS62806 Schematic

Figure 9 illustrates the TPS62807 EVM schematic.

Figure 9. TPS62807 Schematic

Figure 10 illustrates the TPS62808 EVM schematic.

Figure 10. TPS62808 Schematic

Tabla de contenidos

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