Texas Instruments TPS61280-585 User manual

User's Guide

SLVU955A–December 2013–Revised June 2014

TPS61280-585 Evaluation Module

This User's Guide describes the characteristics, operation, and use of the TPS61280 evaluation module

(EVM). This EVM enables test and evaluation of the Texas Instruments' TPS61280 device, a 2.3-MHz

(typ.), up to 4.8-V input, step-up dc-dc converter with integrated Pass-Through Mode. This User's Guide

includes EVM specifications, user software description, the schematic diagram, bill of materials, and board

layout. After the release of the A-version device in the summer of 2014, the EVM is assembled with the

TPS61280A (supports PWM mode during startup which is not available for TPS61280).

Contents

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

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

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

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

2 TPS61280EVM Schematic ................................................................................................. 3

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

3.1 J1 Input Connectors................................................................................................ 4

3.2 J2 Output Connector ............................................................................................... 4

3.3 Other Connectors................................................................................................... 5

3.4 Jumpers.............................................................................................................. 5

4 TPS61280EVM Assembly Drawings and Layout........................................................................ 7

5 List of Materials .............................................................................................................. 9

List of Figures

1 TPS61280EVM-585 Schematic............................................................................................ 3

2 TPS61280EVM-585 Component Placement............................................................................. 7

3 TPS61280EVM-585 Top Copper .......................................................................................... 7

4 TPS61280EVM-585 Inner Layer 1 ........................................................................................ 8

5 TPS61280EVM-585 Inner Layer 2 ........................................................................................ 8

6 TPS61280EVM-585 Bottom Copper ...................................................................................... 8

7 Quick Connection Overview................................................................................................ 9

8 User Interface of TPS61280EVM-585................................................................................... 10

9 I²C Pull-Up Resistor Setting............................................................................................... 11

SLVU955A–December 2013–Revised June 2014 TPS61280-585 Evaluation Module

Introduction

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1 Introduction

The TPS61280 device provides a power-supply solution for products powered by either a three-cell

alkaline, NiCd or NiMH battery, or a single-cell Li-Ion or Li-polymer battery. The wide input voltage range

is ideal for portable power applications such as mobile phones or computer peripherals. In addition, the

TPS61280 can also maintain its output biased at the input voltage level. In this mode, the synchronous

rectifier is current-limited, and allows external loads (for example, an audio amplifier) to be powered with a

restricted supply. In this mode, quiescent current is reduced to 18 μA. Input current in shutdown mode is

less than 5 μA in order to maximize battery life.

1.1 Requirements

The TPS61280EVM is designed to operate over the full input voltage range and produces a fixed output

voltage.

In order to operate this EVM, only a dc power supply able to deliver between 2.3 V and 4.8 V is required.

1.2 Applications

• Single-Cell Ni-Rich, Si-Anode, Li-Ion, LiFePO4 smart-phones or tablet PCs

• 2.5G, 3G, and 4G mini-module data cards

• Current-limited applications featuring high peak power loads

1.3 Features

• 95% Efficiency at 2.3-MHz operation

• VIN range from 2.3 V to 4.8 V

• 2-μA quiescent current in low IQ pass-through mode

• Integrated pass-through mode (35 mΩ)

• Programmable valley inductor current limit and output voltage via I²C interface

• True pass-through mode during shutdown

• Thermal shutdown and overload protection

• Total solution size < 20 mm², sub 1-mm Profil

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J10

J11

150uF

VSELENABLE nBYP

GNDGND

VIN VIN

C12C11C10

2.2k

VIN

GND

GPIO/PG

VIN

S+

S-

GND

C2 C3 C4

GND

GNDGND GND GND

GND

VIN

VOUT

Ferrite Bead

10µF

10uF

C7 C8 C9

GND

ENABLE VSEL nBYP GPIO

GPIO

VSEL

ENABLE

nBYP

SDA

2.2k

VIN

I2C_CONNECTOR

GND

1 2

3 4

5 6

7 8

9 10

A1 GPIO A2

VIN

VSEL

SCL

VOUT B3

VOUT B4

BYP

SDA

C3 SW

AGND D1

PGND D2

PGND D3

PGND D4

TPS61280YFF

SCL

SDA

1.5µF

470nH

VOUT

S+

S-

GND

1 1 1

1 1

1 1 11 1

1Not Installed

2.3V - 4.8V 2.85V - 4.4V

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TPS61280EVM Schematic

2 TPS61280EVM Schematic

Figure 1 illustrates the TPS61280EVM schematic.

Figure 1. TPS61280EVM-585 Schematic

SLVU955A–December 2013–Revised June 2014 TPS61280-585 Evaluation Module

Connector and Test Point Descriptions

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3 Connector and Test Point Descriptions

3.1 J1 Input Connectors

3.1.1 Pin 1 and 2: VIN

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

between these pins and pins 5 and 6 (GND). Twist the leads to the input supply and keep them as short

as possible. The input voltage must be between 2.3 V and 4.8 V.

3.1.2 Pin 3: Input Sense VIN

This header is intended to measure the input voltage directly on the input capacitor close to the device.

Therefore, a four-wire power and sense supply can be connected. Twist the leads to the sensing

connector.

Pin 4: Input Sense GND

This header is intended to measure the GND close to the input of the device. Therefore, a four-wire power

and sense supply can be connected. Twist the leads to the sensing connector.

3.1.3 Pin 5 and 6: GND

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

pins and pins 1 and 2 (VIN). Twist the leads to the input supply and keep them as short as possible. The

input voltage must be between 2.3 V and 4.8 V.

3.2 J2 Output Connector

3.2.1 Pin 1 and 2: VOUT

This header is the positive connection of the output voltage. Connect the load between these pins and

pins 5 and 6 (GND).

3.2.2 Pin 3: Output Sense VOUT

This header is intended to measure the output voltage directly on the output capacitors.

3.2.3 Pin 4: Output Sense GND

This header is intended to measure the GND close to the output of the device.

Pin 5 and 6: GND

This is the return connection of the output voltage. Connect the load between these pins and Pin 1 and 2

(VOUT).

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Connector and Test Point Descriptions

3.3 Other Connectors

J9: I²C Connector

This 10-pin header connects the USB-to-GPIO adaptor to the TPS61280EVM-585.

J10: SMA Input Connector

This SMA connector is connected to the input voltage of the converter. It can be used to easily analyze

the noise spectrum of the input voltage with a spectrum analyzer. By default, J10 is not assembled on the

EVM.

3.3.1 J11: SMA Output Connector

This SMA connector is connected to the output voltage of the converter. It can be used to easily analyze

the noise spectrum of the output voltage with a spectrum analyzer. By default, J11 is not assembled on

the EVM.

3.4 Jumpers

3.4.1 J3: Enable Jumper

Placing a jumper across pins EN and ON ties the EN pin to VIN, and enables the device. Placing a jumper

across pins EN and OFF ties the EN pin to GND, which disables the device.

J4: VSEL, Output Voltage Selection

Placing a jumper across pins HIGH and VSEL ties the VSEL pin to VIN, and selects the default output roof

voltage. Placing a jumper across pins LOW and VSEL ties the VSEL pin to GND, and selects the default

output floor voltage.

Table 1. TPS61280 VSEL Settings

Value Description Default Output Voltage

HIGH Selects the Output Roof Voltage as stored in register 0x03 3.15 V

LOW Selects the Output Floor Voltage as stored in register 0x02 3.35 V

J5: nBYP, Forced Bypass Selection

Placing a jumper across pins nBYP and ON ties the nBYP pin to GND and enables the pass-through

mode. Placing a jumper across pins nBYP and OFF ties the nBYP pin to VIN and enables auto DC/DC

boost mode.

Table 2. TPS61280 Mode of Operations

EN Input nBYP Input Device Status

LOW LOW The device is shut down in pass-through mode featuring a shutdown current down to ca. 2 μA typ. The

load current capability is limited (up to ca. 250 mA).

LOW HIGH The device is shut down and the output voltage is reduced to a minimum value (VIN – VOUT ≤3.6 V).

The device shutdown current is approximately 8.5 μA typ.

HIGH LOW The device is active in forced pass-through mode. The device supply current is approximately 15 μA typ.

from the battery. The device is short-circuit protected by a current limit of ca. 7300 mA.

HIGH HIGH The device is active in auto mode (dc/dc boost, pass-through). The device supply current is approximately

50 μA typ. from the battery.

J6: GPIO/PG, General Purpose In/Out and Power Good

This pin can either be configured as a input (mode selection) or as dual role input/open-drain output

(nRST/nFAULT) pin. Per default, the pin is configured as nRST/nFAULT input/output.

Pin GPIO/PG is connected to HIGH per default. This pin is tied to VIN via pull-Up resistor R5.

SLVU955A–December 2013–Revised June 2014 TPS61280-585 Evaluation Module

Connector and Test Point Descriptions

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J7: SCL Pull-Up Resistor

This header enables the possibility to apply the onboard pull-Up resistor R3 as well as to track the I²C

Clock signal on pin 2.

Placing a jumper across pins 1 and 2 ties SCL via resistor R3 to VIN. Per default, the USB-to-GPIO

Interface Adapter has a Pull-Up resistor applied. Therefore this Jumper is not fitted.

J8: SDA Pull-Up Resistor

This header enables the possibility to apply the onboard pull-Up resistor R4 as well as to track the I²C

Data signal on pin 2.

Placing a jumper across pins 1 and 2 ties SDA via resistor R4 to VIN. Per default, the USB-to-GPIO

Interface Adapter has a Pull-Up resistor applied. Therefore, this jumper is not fitted.

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TPS61280EVM Assembly Drawings and Layout

4 TPS61280EVM Assembly Drawings and Layout

Figure 2 through Figure 6 show the design of the TPS61280EVM-585 PCBs. The EVM has been designed

using a four-layer, 1-ounce copper-clad PCB with all components in an active area on the top side of the

board. Moving components to both sides of the PCB can offer additional size reduction for space-

constrained systems.

All layers are viewed from top side.

Figure 2. TPS61280EVM-585 Component Placement

Figure 3. TPS61280EVM-585 Top Copper

SLVU955A–December 2013–Revised June 2014 TPS61280-585 Evaluation Module

TPS61280EVM Assembly Drawings and Layout

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Figure 4. TPS61280EVM-585 Inner Layer 1

Figure 5. TPS61280EVM-585 Inner Layer 2

Figure 6. TPS61280EVM-585 Bottom Copper

8TPS61280-585 Evaluation Module SLVU955A–December 2013–Revised June 2014

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Host

Computer

USB Cable

USB

Interface

Adapter

Green LED

Indicates

Power

10-Pin

Ribbon

Cable

EVM Board

USB Interface Adaptor Quick Connection Diagram

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List of Materials

5 List of Materials

Table 3 lists the EVM components as configured according to the schematic shown in Figure 1.

Table 3. TPS61280 Bill of Materials

Count RefDes Value Description Size Part Number MFR

TPS61280 Solution Required Components

1 C5 1.5µF Capacitor, Ceramic, 6.3V +/- 20%, X5R 0402 GRM155R60J155ME80D MuRata

2 C6, C7 10µF Capacitor, Ceramic, 6.3V, +/- 20%, X5R 0603 GRM188R60J106ME84D MuRata

1 L1 470nH Inductor, Ferrite, 3.7A, 29mΩ2512 1239AS-H-R47M Toko

1 U1 TPS61280A IC, Step-Up DC/DC Converter with Pass-Through Mode 4x4 WCSP TPS61280AYFF Texas Instruments

TPS61280EVM-585 Evaluation Components

1 C1 150µF Capacitor, Tantalum, 6.3V +/-10%, 70mΩ7343-20 T495V157K006ATE070 Kemet

3 R3, R4, R5 2.2kΩResistor, +/-5%, 100mW 0603 RC0603JR-072K2L Yageo America

2 J1, J2 Header, 6x1, 100mil spacing TSW-106-07-G-S Samtec

6 J3, J4, J5, J6, Header, 2x1, 100mil spacing TSW-102-07-G-S Samtec

J7, J8

1 J9 Connector, 5x2, Shrouded, 100mil spacing 5103308-1 TE Connectivity

Software User Interface

Software Setup

The software is available at the TI.com website (SLVC543).

Download and unzip the file. Run setup.msi and follow the instructions appearing during the installation.

After the installation is completed, run the software by going to:

START -> All Programs -> Texas Instruments -> TPS61280 EVM -> TPS61280 EVM

Interface Hardware Setup

Connect the USB-to-GPIO adapter to your PC using the supplied USB cable. Connect the TPS61280EVM

connector J9 to the USB-to-GPIO adapter using the supplied 10-pin ribbon cable. The connectors on the

ribbon cable are keyed to prevent incorrect installation.

Figure 7 shows a quick adapter connection overview.

Figure 7. Quick Connection Overview

User Interface Operation

SLVU955A–December 2013–Revised June 2014 TPS61280-585 Evaluation Module

List of Materials

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Figure 8. User Interface of TPS61280EVM-585

Control Section

This section in the left, upper region reflects the User Control Registers. Here all adjustments can be done

on the user level.

5.0.1 Status Section

This section located in the left, lower region reflects the Status Register of the device.

The right part of the Interface shows a register-wise view of all parameters. This section reflects the

settings displayed in the left part as described in Section 5.0.1.

Here single registers can be read, or written to the device (if applicable).

Hardware Pull-Up Resistor Selection

Clicking on the SETUP Button in the top, a Pull-Up Resistor selection appears. Here the internal resistors

of the USB-to-GPIO interface can be switched ON/OFF. The status is displayed in the status bar.

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