Texas Instruments TPS65720EVM User manual

User's Guide

SLVU324–March 2010

TPS65720EVM

The TPS65720EVM-515 evaluation module is a fully assembled and tested circuit for evaluating the

TPS65720 two-channel power management integrated circuit..

Contents

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

1.1 Requirements ....................................................................................................... 2

1.2 1.2 Applications .................................................................................................... 2

1.3 Features ............................................................................................................. 2

2 TPS65720EVM Electrical Performance Specifications ................................................................ 3

3 TPS65720EVM Schematic ................................................................................................ 4

4 Connector and Test Point Descriptions .................................................................................. 5

4.1 Enable Jumpers/Switches ........................................................................................ 5

5 Setup ......................................................................................................................... 7

5.1 Software Setup ..................................................................................................... 7

5.2 Hardware Setup .................................................................................................... 7

5.3 Running the Software ............................................................................................. 7

6 TPS65720EVM Assembly Drawings and Layout ...................................................................... 13

7 Bill of Materials ............................................................................................................. 16

List of Figures

1 TPS65720EVM Schematic ................................................................................................ 4

2 Hardware Board Connection .............................................................................................. 7

3 Starting the Software ....................................................................................................... 8

4 Software Charger View..................................................................................................... 9

5 Software DCDC1/LDO1 View............................................................................................ 10

6 GPIO View.................................................................................................................. 11

7 INTERRUPTS VIEW...................................................................................................... 12

8 TPS65720EVM Component Placement (Viewed From Top)........................................................ 13

9 TPS65720EVM Top Copper (Viewed From Top) ..................................................................... 13

10 TPS65720EVM Bottom Copper (X-Ray View )........................................................................ 14

11 TPS65720EVM Internal 1 (X-Ray View From Top)................................................................... 14

12 TPS65720VM Internal 2 (X-Ray View From Top)..................................................................... 15

List of Tables

1 TPS65720EVM Electrical and Performance Specifications ........................................................... 3

2 HPA515B Bill of Materials................................................................................................ 16

SLVU324–March 2010 TPS65720EVM

Introduction

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1 Introduction

1.1 Requirements

In order to operate this evaluation module (EVM), the following components must be connected and

properly configured. All components and connectors are supplied in the EVM except for the host computer

and the DC power supply. Software must be downloaded from the TI Web site at www.ti.com.

1.1.1 Software

To download the software that is necessary to operate the TPS65720EVM, check the TPS65720 product

folder on the TI Web site.

1.1.2 Host Computer

A personal computer (PC) with a USB port is required to operate this EVM. The TPS65720 software runs

on the PC and communicates with the EVM via the PC's USB port and the USB-to-GPIO interface.

PC Requirements :

• Windows™ 2000 or XP operating system

• USB port

• Minimum of 30 MB of free hard-disk space (100 MB recommended)

• Minimum of 256 MB of RAM

1.1.3 Power Supply Requirements

A DC power supply capable of delivering 5 V at 1 A is required to operate this EVM.

1.2 1.2 Applications

• Bluetooth Headsets

• Handheld Applications

1.3 Features

• Input voltage rating

• Output voltage adjustable via I2C Interface

• Battery charger with power path Management

• 300-mA charge current

• 200-mA step-down converter for TPS65720

• 2.25-MHz Switching Frequency

• 1 General-purpose 200-mA LDO

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TPS65720EVM Electrical Performance Specifications

2 TPS65720EVM Electrical Performance Specifications

Table 1. TPS65720EVM Electrical and Performance Specifications

Parameter Symbol Notes and Conditions Min Typ Max Unit

Input Characteristics

Input Voltage AC VAC 4.35 28 V

Input Voltage DCDC1 VIN_DCDC1 2.1 5.6 V

Input Voltage LDO1 VIN_LDO1 1.8 6.6 V

Bit <AC input current1, AC input current0> = 00 90 95 100

Input Current IAC,max mA

Bit <AC input current1, AC input current0> = 01 or 10 450 475 500

UVLO VUVLO VAC rising 3.2 3.3 3.45 V

UVLO Hysteresis VHYS-UVLO VAC falling 200 300 mV

Output Characteristics

Voltage Range at SYS VSYS 2.2 5.6 V

Output Voltage DCDC1 VDCDC1 VIN = Nom, IOUT = Nom 1.2 V

VIN = 2.3 V to 5.6 V, PFM operation, 1 3 %

0 mA to IOUT, max

Output Voltage Accuracy DCDC1 VIN = 2.3 V to 5.6 V, PWM operation, -2 2 %

0 mA to IOUT, max

Load Regulation PWM operation 0.5 %

Output Current DCDC1 IOUT,DCDC1 VIN = Min to Max 200 mA

Forward Current Limit High-side ILIMF VIN = 2.3 V to 5.6 V 425 600 775 mA

and Low-side MOSFET

Dropout Voltage LDO1 VIN,LDO = 2.05 V, IOUT = 200 mA 180 mA

Default Output Voltage LDO1 VLDO1 VIN = Nom, IOUT = Nom 1.85 V

Output Voltage Accuracy LDO1 -1.5 2.5 %

Output Current of LDO1 200 mA

Line Regulation LDO1 -1 1 %

Load Regulation LDO1 VIN = Nom, VOUT = VOUT2-5% -1 2 %

Systems Characteristics

Switching Frequency FSW 2030 2250 2480 kHz

Peak Efficiency hpk VIN =Nom 92 %

Full Load Efficiency hVIN = 3.6, VOUT = 2.05, IOUT = 400 mA 89 %

MIPSA25202R2

SLVU324–March 2010 TPS65720EVM

TPS65720EVM Schematic

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3 TPS65720EVM Schematic

For Reference Only, See Table 2 for specific values.

Figure 1. TPS65720EVM Schematic

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Connector and Test Point Descriptions

4 Connector and Test Point Descriptions

4.1 Enable Jumpers/Switches

4.1.1 J1 – VIN

This header is the positive connection to the input power supply. The power supply must be connected

between J1 and J2 (GND). The leads to the input supply must be twisted and kept as short as possible.

The input voltage has to be between 4.35 V and 6 V.

4.1.2 J2 – GND

This header is the return connection to the input power supply. Connect the power supply between J2 and

J1 (VIN). The leads to the input supply must be twisted and kept as short as possible. The input voltage

has to be between 4.35 V and 6 V.

4.1.3 J3 – BAT / GND / TS

Connect your battery positive connection to pin 1 of J3, negative connection to pin 2 of J3. The battery

thermistor can be connected to pin 3 of J3. if an external thermistor is used, R2 must be removed.

4.1.4 J4 – SYS

This header is the positive output of the power path.

4.1.5 J5 – GND

This header is the negative output of the power path.

4.1.6 J6 – VIN_LDO1 / GND

This header is the input supply for the LDO1 on the EVM. VINLDO1 is directly connected to SYS with R4.

It also can be connected to VDCDC1 with R5. An external power supply can be connected between J6

pin1 (VINLDO) and pin2 (GND). Note that the resistors R4 and R5 must be removed when supplying the

LDO1 from an external power supply.

4.1.7 J7 – VDCDC1

This header is the positive output of VDCDC1 step-down converter. The output voltage of DCDC1 can be

adjusted to any voltage between 0.6 V and VINDCDC1 with the external voltage divider R7 and R8.

The default setting is 1.2 V. VDCDC1 is capable of sourcing up to 200 mA. A load can be connected

between J7 and J8 (GND).

4.1.8 J8 – GND

J8 is the return connection of VDCDC1 output rail. A load can be connected between J8 and J7

(VDCDC1).

4.1.9 J9 – VLDO

This header is the positive output of LDO1 linear regulator. The default output voltage of LDO1 is 1.85 V.

VLDO1 can be adjusted via I2C interface in the range between .

LDO1 is capable of sourcing up to 300 mA. A load can be connected between J9 and J10 (GND).

4.1.10 J10 – GND

J10 is the return connection of LDO1 output rail. A load can be connected between J10 and J9

(VDCDC1).

SLVU324–March 2010 TPS65720EVM

Connector and Test Point Descriptions

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4.1.11 J11 /INT / RESET / GND

J11 pin 1 is connected to the open-drain output /INT. J11 pin 2 is connected to the open-drain output

RESET. All open-drain outputs are pulled up with a resistor to the pullup voltage PULLUP. Pullup is

connected to VLDO1 with R10 on the EVM. Pullup also can be connected to VIN and VDCDC1 with the

resistors R20 and R21. J13 pin 3 is connected to GND.

4.1.12 J12 SYS/GPIO0/GPIO1/GPIO2/GPIO3/SYS

Four GPIOs are available on this header.

• J12 pin 1 is connected to the SYS voltage.

• J12 pin 2 is connected to GPIO0.

• J12 pin 3 is connected to GPIO1.

• J12 pin 4 is connected to GPIO2.

• J12 pin 5 is connected to GPIO3.

4.1.13 J13

J13 is the interface connector for the I2C interface. Connect a 10-pin ribbon cable between J13 and the

USB-to-GPIO interface.

4.1.14 JP1

JP1 connects the cathode of the LED D2 to GPIO2. If GPIO2 is configured as a current sink JP1 can be

removed to measure the current through the LED with an ammeter.

If GPIO2 is configured as an input or output, JP1 must be removed to disconnect the LED D2.

4.1.15 JP2

JP2 connects the cathode of the LED D1 to GPIO3. If GPIO3 is configured as a current sink, JP2 can be

removed to measure the current through the LED with an ammeter.

4.1.16 JP3 HOLD_DCDC1

Connect a shorting jumper between HOLD_DCDC1 and SYS to enable DCDC1. Note that if a power

supply is connected to AC, DCDC1 is enabled independent of the status of HOLD_DCDC1.

If the IC is supplied from BAT, DCDC1 is enabled when PB_IN is pulled low. To keep DCDC1 enabled,

HOLD_DCDC1 must be pulled high before /PB_IN is released high.

4.1.17 JP4 HOLD_LDO1

Connect a shorting jumper between HOLD_LDO1 and SYS to enable LDO1. Note that if a power supply is

connected to AC, LDO is enabled independent of the status of HOLD_LDO1.

If the IC is supplied from BAT, LDO is enabled when /PB_IN is pulled low. To keep LDO1 enabled,

HOLD_LDO11 must be pulled high before PB_IN is released high.

4.1.18 S1 – PB_IN

This is the pushbutton Input. Pressing S1 pulls PB_IN to GND and therefore enables DCDC1 and LDO1.

To keep DCDC1 / LDO1 enabled, the individual HOLD pins must be pulled high before PB_IN is released

high.

If a power supply is present at AC, both DCDC1 and LDO1 are enabled independent of the HOLD pins.

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TPS65720EVM-515

Host Computer

USB to GPIO Interface

DC Power Supply

J1 J2

J13

Lithium Ion

Battery

TS +

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Setup

5 Setup

5.1 Software Setup

To download the software, go the TPS65720 product folder on the TI Web site (www.ti.com).

Download the software, and execute it to install the software.

5.2 Hardware Setup

Figure 2. Hardware Board Connection

5.3 Running the Software

Click on the TPS65720_1EVM icon to start the software. If no icon appears on the host computer, then

use the start button in the lower left corner of the screen to browse the program folders to find the

software. The default directory for software installation is Program Files\Texas

Instruments\TPS65720_1EVM.

Once the software is started, a dialog box appears (see Figure 3) and asks the user to select whether a

TPS65720 or TPS65721 is connected.

SLVU324–March 2010 TPS65720EVM

Setup

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Figure 3. Starting the Software

Once the used device is selected, the software starts up (see Figure 4).

By clicking on the Tabs CHARGER , DCDC1/LDO1, GPIO, and INTERRUPTS, the user can navigate

through the different Views

The window that first appears allows control of all charger settings and shows all the charger status Flags.

In the CHARGER Tab, users can enable/disable the charger and change charger parameters as regulated

output voltage on the Power Path (VSYS), Charge Voltage, Safety Timers, etc.

In the Lower right corner of the window, all charger related User Registers are displayed.

See the TPS65720 data sheet for detailed description on these registers.

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Setup

Figure 4. Software Charger View

The DCDC1/LDO1 control window (see Figure 5) allows control of operating mode (PWM/PFM) for the

DC/DC converter, output voltage of LDO1 (TPS65720 only) and shows the Status Flags related to DCDC1

and LDO1.

In the lower right corner of the window, all DCDC1/LDO1-related User Registers are displayed.

See the TPS65720 data sheet for detailed description on these registers.

SLVU324–March 2010 TPS65720EVM

Setup

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Figure 5. Software DCDC1/LDO1 View

The GPIO control window (see Figure 6) allows control of the fours GPIOs of the TPS65720/1. The GPIOs

can be configured as input or output. In addition, GPIO2 and GPIO3 can be configured as current sink to

drive an external LED.

In the lower right corner of the window, all GPIO-related User Registers are displayed.

See the TPS65720 data sheet for detailed description on these registers.

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