Texas Instruments TPS62065EVM, TPS62067EVM User Manual

User's Guide

SLVU364–March 2010

TPS62065/67EVM

This user’s guide describes the characteristics, operation, and use of the TPS62065-67EVM-347 evaluation module (EVM). The TPS62065-67EVM-347 is a fully assembled and tested platform for evaluating the performance of both the TPS62065 and TPS62067 2-A step-down converters. This document includes schematic diagrams, printed circuit board (PCB) layout, bill of materials, and test data. Throughout this document, the abbreviations EVM, TPS62065/67EVM, and the term evaluation module are synonymous with the TPS62065-67EVM-347 unless otherwise noted.

Contents

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

2 Electrical Performance Specifications .................................................................................... 2

3 TPS62056/67EVM Schematic ............................................................................................. 3

4 Connector and Test Point Descriptions .................................................................................. 4

5 Test Configuration .......................................................................................................... 6

6 TPS62065/67EVM Test Data .............................................................................................. 8

7 TPS62065/67EVM-347 Assembly Drawings and Layout ............................................................ 12

8 Bill of Materials ............................................................................................................. 18

List of Figures

1 TPS62065EVM Schematic ................................................................................................ 3

2 TPS62067EVM Schematic ................................................................................................ 3

3 Hardware Board Connection .............................................................................................. 6

4 TPS62065, TPS62067 Efficiency vs Load Current..................................................................... 8

5 TPS62065 Startup into 2.2-Ω Load....................................................................................... 8

6 TPS62067 Startup into 2.2-Ω Load....................................................................................... 9

7 TPS62067 Shutdown: No Load........................................................................................... 9

8 TPS62065 Output Voltage Ripple (PFM Mode)....................................................................... 10

9 TPS62065 Output Voltage Ripple (PWM Mode) ...................................................................... 10

10 TPS62065 Gain and Phase vs Frequency............................................................................. 11

11 TPS62065 Gain and Phase vs Frequency............................................................................. 11

12 TPS62065/67EVM Component Placement (Top View) .............................................................. 13

13 TPS62065/67EVM Top-Side Copper (Top View) ..................................................................... 14

14 TPS62065/67EVM Internal Layer 2 (X-Ray View, from Top)........................................................ 15

15 TPS62065/67EVM Internal Layer 1 (X-Ray View, from Top)........................................................ 16

16 TPS62065/67EVM Bottom-Side Copper (Bottom View) ............................................................. 17

List of Tables

1 TPS62065/67EVM Performance Characteristics ....................................................................... 2

2 TPS62065/67EVM Bill of Materials ..................................................................................... 18

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Introduction

1 Introduction

The TPS62065-67EVM-347 is a fully assembled and tested pair of PCBs for evaluating the TPS62065 and TPS62067 2-A step-down converters. The EVM comes configured with both a TPS62065 IC and a TPS62067 IC; there are two PCBs, one for each respective step-down converter IC.

1.1 Features

• Input voltage range: 3.0 V to 6.0 V

• Adjustable output voltage: 0.8 V to VIN

• Up to 2.0-A output current

• 3-MHz switching frequency

• Power Good output (TPS62067EVM only)

• Clock dithering

1.2 TPS62065/67 Applications

The TPS62065 and TPS62067 step-down converters are ideal for these applications:

• POL

• Digital cameras

• PDAs, pocket PCs

• Portable media players

• DSP supply

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2 Electrical Performance Specifications

Table 1 summarizes the TPS62065/67EVM performance specifications.

Table 1. TPS62065/67EVM Performance Characteristics

Parameter Symbol Conditions Min Typ Max Units

Input Characteristics

Input Voltage VIN 3.0 6.0 V Input Undervoltage Lockout

(UVLO)

Output Characteristics

Line Regulation 0 %/V Load Regulation –0.5 %/A Output Current 1 I Forward Current Limit

High-Side and Low Side I MOSFET

Systems Characteristics

Switching Frequency f Peak Efficiency hpkVIN =Nom 95 %

Full Load Efficiency h 1.8 V I

Falling 1.73 1.78 1.83 V

IN_UVLO

Rising 1.9 1.95 1.98 V

1 VIN = 3.0 V to 6.0 V 2000 mA

OUT

VIN = 3.0 V to 6.0 V 2300 2750 3300 mA

LIMF

VIN = 5.0 V, VIN = mA

Notes and

2600 3000 3400 kHz

= 2,000 82 %

OUT

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3 TPS62056/67EVM Schematic

Figure 1 shows the TPS62065EVM schematic. Figure 2 illustrates the TPS62067EVM schematic.

Figure 1. TPS62065EVM Schematic

TPS62056/67EVM Schematic

Figure 2. TPS62067EVM Schematic

NOTE: These diagrams are provided for reference only. See Table 2, the Bill of Materials, for

specific component values.

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Connector and Test Point Descriptions

4 Connector and Test Point Descriptions

4.1 Enable Jumpers/Switches: TPS62065EVM

4.1.1 J10 VIN

This header is the positive connection to the input power supply. The power supply must be connected between J10 and J12 (GND). The leads to the input supply should be twisted and kept as short as possible. The input voltage must be between 3.0 V and 6.0 V.

4.1.2 J11 S+/S–

J11 S+/S– are the sense connections for the input of the converter. Connect a voltmeter, or the sense connection of a power supply or oscilloscope, to this header.

4.1.3 J12 GND

This header is the return connection to the input power supply. Connect the power supply between J12 and J10 (VIN). The leads to the input supply should be twisted and kept as short as possible. The input voltage must be between 3.0 V and 6.0 V.

4.1.4 J13 VOUT

This header is the positive output of the step-down converter. The output voltage of the TPS62065 is adjustable with feedback resistors R10 and R11. On the EVM, the output voltage is set to 1.8 V by default.

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NOTE: A feed-forward capacitor is required. Refer to the TPS6206x data sheet (SLVS833) for

detailed information.

4.1.5 J14 S+/S–

J14 S+/S– are the sense connections for the output of the converter. Connect a voltmeter, or the sense connection of an electronic load or oscilloscope, to this header.

4.1.6 J15 GND

J15 is the return connection of the converter. A load can be connected between J15 and J13 (V converter is capable of carrying a load current up to 2000 mA.

4.1.7 JP10 EN

This jumper enables/disables the TPS62065 on the EVM. Shorting jumper JP10 between the center pin and On turns on the unit. Shorting the jumper between center pin and Off turns the unit off. A 1-MΩ pull-up resistor is connected between VIN and EN. Removing jumper JP10 turns on the converter.

4.1.8 JP11 MODE

This jumper enables/disables the power-saving mode under light loads. Shorting jumper JP11 between the center pin and PWM disables the power-saving mode; If the power save mode is disabled, the converter operates in forced PWM mode over the entire load current range. Shorting the jumper between the center pin and PWM/PSM enables the power-saving mode. The device operates in power-saving mode under light load conditions. See the TPS6206x data sheet (SLVS833) for a detailed description of this configuration. A 1-MΩ pulldown resistor is connected between GND and MODE. By removing JP11, the converter operates in power-saving mode under light load conditions.

OUT

). The

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4.1.9 J16 VOUT (SMA)

This SMA connector is connected to the output voltage of the TPS62065. It can be used to easily analyze the noise spectrum of the output voltage with a spectrum analyzer. By default, J16 is not assembled on the EVM.

4.2 Enable Jumpers/Switches: TPS62067EVM

4.2.1 J20 VIN

4.2.2 J21 S+/S–

J21 S+/S– are the sense connections for the converter input. Connect a voltmeter, or the sense connection of a power supply or an oscilloscope, to this header.

4.2.3 J22 GND

This header is the return connection to the input power supply. Connect the power supply between J22 and J20 (VIN). The leads to the input supply should be twisted and kept as short as possible. The input voltage must be between 3.0 V and 6.0 V.

Connector and Test Point Descriptions

4.2.4 J23 VOUT

This header is the positive output of the step-down converter. The output voltage of the TPS62067 is adjustable with the feedback resistors R20 and R21. On the EVM, the output voltage is set to 3.3 V by default.

NOTE: There is a feed-forward capacitor required. Refer to the TPS6206x data sheet (SLVS833)

for detailed information.

4.2.5 J24 S+/S–

J24 S+/S– are the sense connections for the converter output. Connect a voltmeter, or the sense connection of an electronic load or an oscilloscope, to this header.

4.2.6 J25 GND

J25 is the return connection of the converter. A load can be connected between J25and J23 (V converter is capable of a load up to 2,000 mA load current.

4.2.7 J26 PG

PG (Power Good) is an open-drain output. A 1-MΩ pull-up resistor is connected between VIN and PG. This circuit is active once the device is enabled. It is driven by an internal comparatir that is connected to the FB voltage. The PG output provides a high-level output once the FB voltage reaches 95% of its nominal value. The PG output provides a low-level output when the FB voltage falls below 90% of its nominal value.

OUT

). The

NOTE: This function is only available on the TPS62067EVM.

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J12

J13

J11

J14

J10

J15

JP10

ONENOFF

VIN

GND

VOUT

GND

S+

S-

TPS62065/67EVM-347

PowerSupply

Load

Oscilloscope

Test Configuration

4.2.8 JP20 EN

This jumper enables/disables the TPS62067 device on the EVM. Shorting jumper JP20 between the center pin and On turns on the unit. Shorting the jumper between center pin and Off turns the unit off. A 1-MΩ pull-up resistor is connected between VIN and EN. Removing jumper JP20 also turns on the converter.

4.2.9 J27 VOUT (SMA)

This SMA connector is connected to the output voltage of the TPS62067. It can be used to easily analyze the noise spectrum of the output voltage with a spectrum analyzer. By default, J27 is not assembled on the EVM.

5 Test Configuration

5.1 Hardware Setup

Figure 3 illustrates a typical hardware test configuration.

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TPS62065/67EVM SLVU364–March 2010

Figure 3. Hardware Board Connection

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Texas Instruments TPS62065EVM, TPS62067EVM User Manual

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