Texas Instruments bq24725EVM, Руководство пользователя

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Introduction
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• Jumpers available. Easy-to-change connections.
1.2 General Description
The bq24725EVM evaluation module (also referred to as HPA-542) is a complete charger module for
evaluating a multicell synchronous notebook charge using the bq24725 devices. It is designed to deliver
up to 4 A of charge current to Li-ion or Li-polymer applications.
The bq24725 does not include the EV2300 interface board. To evaluate the bq24725, the EV2300
interface board must be ordered separately.
The bq24725 has a highly integrated battery charge controller designed to work with external host
commands. The charge voltage, charge current, input current, and flexible charge option are
programmable with a SMBus interface.
The bq24725 supports high-efficiency and low-cost NMOS power path selector and has an integrated gate
driver for both adapter-side and battery-side power path selector switch.
The dynamic power management (DPM) function modifies the charge current depending on system load
conditions, avoiding ac adapter overload.
High-accuracy current sense amplifiers enable accurate measurement of the ac adapter current, allowing
monitoring of overall system power.
For details, see bq24725 data sheet ( SLUS702 ).
1.3 I/O 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
J4 – GND External power supply, negative output
1.4 Controls and Key Parameters Setting
Jack Description Factory Setting
JMP1 Connect battery voltage to VCC pin Jumper installed
1.5 Recommended Operating Conditions
Min Typ Max Unit Notes
Supply voltage, V
IN
Input voltage from ac adapter input 18 19 - 20 22 V
Battery voltage, V
BAT
Voltage applied at VBAT terminal 0 6 - 20 V
16.8
Supply current, I
AC
Maximum input current from ac adapter 0 4.5 A
input
Charge current, I
chrg
Battery charge current 1 3 4 A
Operating junction temperature 0 125 ° C
range, T
J
2 bq24725EVM Evaluation Module SLUU439A – August 2010 – Revised May 2011
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