Texas Instruments Evaluation Module for BQ24735, 1-4 Cell Li+ Battery SMBus Charge Controller BQ24735EVM-710 BQ24735EVM-710 Fiche De Données
Codes de produits
BQ24735EVM-710
Introduction
1
Introduction
1.1
EVM Features
•
Evaluation module for bq24725A/735
•
bq24735 adapter and battery together provide power to system to support Intel™ CPU Turbo Boost
mode
mode
•
High-efficiency NMOS-NMOS synchronous buck charger with 750-kHz frequency
•
High-efficiency and low-cost NMOS power path selector and integrated gate driver
•
User-selectable 1-cell, 2-cell, 3-cell, or 4-cell Li-ion battery voltage
•
Programmable battery voltage, charge current, and ac adapter current via SMBus interface
•
Flexible Chargeoption() register control via SMBus interface
•
AC adapter operating range 4.5 V–24 V
•
Test points for key signals available for testing purposes. Easy probe hook-up
•
Jumpers available. Easy-to-change connections
1.2
General Description
The bq24725A/735 evaluation module (EVM) is a complete charger module for evaluating a multicell
synchronous notebook turbo boost charge using the bq24725A/735 devices. It is designed to deliver up to
4 A of charge current to Li-ion or Li-polymer applications. The charge current is programmable by SMBus
interface through the EV2300 interface board.
synchronous notebook turbo boost charge using the bq24725A/735 devices. It is designed to deliver up to
4 A of charge current to Li-ion or Li-polymer applications. The charge current is programmable by SMBus
interface through the EV2300 interface board.
The bq24725A/735EVM does not include the EV2300 interface board. In order to evaluate the
bq24725A/735EVM, a user must order the EV2300 interface board separately.
bq24725A/735EVM, a user must order the EV2300 interface board separately.
The bq24725A/735 is a high-efficiency, synchronous battery charger, offering low component count for
space-constraint, multichemistry battery charging applications.
space-constraint, multichemistry battery charging applications.
The bq24735 supports the Turbo Boost mode by allowing the battery to discharge energy to the system
when system power demand is temporarily higher than adapter maximum power level so that the adapter
does not crash.
when system power demand is temporarily higher than adapter maximum power level so that the adapter
does not crash.
The bq24725A/735 uses two charge pumps to separately drive n-channel MOSFETs (ACFET, RBFET,
and BATFET) for automatic system power source selection.
and BATFET) for automatic system power source selection.
SMBus-controlled input current, charge current, and charge voltage DACs allow for high regulation
accuracies that can be easily programmed by the system power management microcontroller.
accuracies that can be easily programmed by the system power management microcontroller.
To throttle down PWM modulation and reduce the charge current, the bq24725A/735 uses the internal
input current register or the external ILIM pin .
input current register or the external ILIM pin .
The bq24725A/735 charges one, two, three, or four series Li+ cells and is available in a 20-pin, 3.5 x 3.5
mm
mm
2
QFN package. For details, see the bq24725A/735 data sheet (
).
1.3
Input/Output Jack Description
Jack
Description
J1–DCIN
AC adapter, positive output
J1–GND
AC adapter, negative output
J2-SYS
Connected to system
J2-BAT
Connected to battery pack
J2-GND
Ground
J3-ACOK
ACOK pin
J3-IOUT
IOUT pin
J3-3.3V
External voltage supply, 3.3 V
J4–SCL
SCL pin output, SMBus clock line
J4–SDA
SDA pin output, SMBus data line
2
bq24735/725A Battery Charger Evaluation Module
SLUU507A – June 2011 – Revised September 2011
Copyright © 2011, Texas Instruments Incorporated