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Introduction

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1 Introduction

1.1 EVM Features

• High-efficiency, fully integrated, NMOS-NMOS, synchronous buck charger with 3-MHz frequency

• Integrated power FETs for up to 1.55-A charge rate from either VIN or VBUS inputs

• Programmable battery voltage, charge current, and input current via I

C™ interface

• VIN operating range 4 V – 9 V and VBUS operating range 4 V – 6 V

• Boost-mode operation for USB OTG from VBUS input while charging through VBAT

• LED indication for status signals

• Test points for key signals available for testing purposes. Easy probe hook-up

• Jumpers available. Easy-to-change connections.

1.2 General Description

The bq24140 evaluation module (EVM) is a complete charger module for evaluating compact, flexible,

high-efficiency, USB-friendly, switch-mode charge management and USB-OTG solution for single-cell Li-

ion and Li-polymer batteries used in a wide range of portable applications.

The bq24140, bq24145 integrates a synchronous PWM controller, power MOSFETs, input current

sensing, high-accuracy current and voltage regulation, and charge termination into a small WCSP

package. The charge parameters can be programmed through an I

C interface.

For details, see the bq24140 data sheet. (SLUSAO5).

1.3 I/O Description

Header/Terminal Block Description

J1–VIN AC adapter positive input terminal

J1–GND AC adapter negative input terminal

J2 USB-TO-GPIO box connector

J3-VBUS USB positive input terminal

J3-GND USB negative input terminal

J4-VIN AC adapter positive input header

J5–GND AC adapter negative input header

J6-VBUS USB positive input header

J7-VBAT Battery positive output terminal

J7-GND Battery negative output terminal

J8-VREG Internal regulator positive output terminal

J8-GND Internal regulator negative output terminal

J9-GND USB negative input header

J10-VBAT Battery positive output header

J11-GND Battery negative output header

J12-VREG Internal regulator positive output header

J13-GND Internal regulator negative output header

1.4 Test Point Descriptions

Test Point Description

TP1 VIN

TP2 VBUS

TP3 PMID2

bq24140, Fully Integrated, Dual-Input, Switch-Mode, One-Cell, Li-Ion Charger SLUU495A–October 2011–Revised September 2012

With Full USB Compliance and USB-OTG Support EVM

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