- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄295161 > BQ25070DQCR (TEXAS INSTRUMENTS INC) 1 A BATTERY CHARGE CONTROLLER, PDSO10 PDF資料下載
參數(shù)資料
| 型號： | BQ25070DQCR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A BATTERY CHARGE CONTROLLER, PDSO10 |
| 封裝： | 2 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 6/21頁 |
| 文件大小： | 664K |
| 代理商： | BQ25070DQCR |
J
A
JA
D
T
=
P
q
-
SLUSA66
– JULY 2011
APPLICATION INFORMATION
SELECTION OF INPUT/OUTPUT CAPACITORS
In most applications, all that is needed is a high-frequency decoupling capacitor on the input power pin. For
normal charging applications, a 0.1
μF ceramic capacitor, placed in close proximity to the IN pin and GND pad
works best. In some applications, depending on the power supply characteristics and cable length, it may be
necessary to increase the input filter capacitor to avoid exceeding the OVP voltage threshold during adapter hot
plug events where the ringing exceeds the deglitch time.
The charger in the bq25070 requires a capacitor from OUT to GND for loop stability. Connect a 1
μF ceramic
capacitor from BAT to GND close to the pins for best results. More output capacitance may be required to
minimize the output droop during large load transients.
The LDO also requires an output capacitor for loop stability. Connect a 0.1
μF ceramic capacitor from LDO to
GND close to the pins. For improved transient response, this capacitor may be increased.
THERMAL CONSIDERATIONS
The bq25070 is packaged in a thermally enhanced QFN package. The package includes a thermal pad to
provide an effective thermal contact between the IC and the printed circuit board (PCB). Full PCB design
guidelines for this package are provided in the application note entitled: QFN/SON PCB Attachment Application
Note (SLUA271).
The most common measure of package thermal performance is thermal impedance (
θJA) measured (or modeled)
from the chip junction to the air surrounding the package surface (ambient). The mathematical expression for
θJA
is:
Where:
(4)
TJ = chip junction temperature
TA = ambient temperature
PD = device power dissipation
Factors that can greatly influence the measurement and calculation of
θJA include:
Whether or not the device is board mounted
Trace size, composition, thickness, and geometry
Orientation of the device (horizontal or vertical)
Volume of the ambient air surrounding the device under test and airflow
Whether other surfaces are in close proximity to the device being tested
The device power dissipation, PD, is a function of the charge rate and the voltage drop across the internal
PowerFET. It can be calculated from the following equation when a battery pack is being charged:
PD = (VIN – VOUT) × IOUT
Due to the charge profile of LiFePO4 batteries the maximum power dissipation is typically seen at the beginning
of the charge cycle when the battery voltage is at its lowest. See the charging profile, Figure 13. If the board
thermal design is not adequate the programmed fast charge rate current may not be achieved under maximum
input voltage and minimum battery voltage, as the thermal loop can be active, effectively reducing the charge
current to avoid excessive IC junction temperature.
PCB LAYOUT CONSIDERATIONS
It is important to pay special attention to the PCB layout. The following provides some guidelines:
To obtain optimal performance, the decoupling capacitor from IN to GND (thermal pad) and the output filter
capacitors from OUT to GND (thermal pad) should be placed as close as possible to the bq25070, with short
trace runs to both IN, OUT and GND (thermal pad).
14
Copyright
2011, Texas Instruments Incorporated
相關PDF資料 |
PDF描述 |
|---|---|
| BQ3285ESSNTR | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285ESS-N | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285ESSN | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285LCSS | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285ECSS | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| BQ25070DQCT | 功能描述:電池管理 1A,Sgl cell,Linear Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| BQ25070EVM-740 | 功能描述:電源管理IC開發(fā)工具 BQ25070 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| BQ25071DQCR | 功能描述:IC LINEAR BATT CHRGR SGL 10WSON 制造商:texas instruments 系列:- 包裝:帶卷（TR） 零件狀態(tài):有效 電池化學:磷酸鐵鋰 電池數(shù):1 電流 - 充電:恒流 - 可編程 可編程特性:- 故障保護:超溫，過壓 充電電流 - 最大值:1A 電池組電壓:3.5V 電壓 -?供電（最高）:10.2V 接口:USB 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:10-WFDFN 裸露焊盤 供應商器件封裝:10-WSON（3x2） 標準包裝:3,000 |
| BQ25071DQCT | 功能描述:IC LINEAR BATT CHRGR SGL 10WSON 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 電池化學:磷酸鐵鋰 電池數(shù):1 Current Charging:恒流 - 可編程 可編程特性:- 故障保護:超溫，過壓 充電電流 - 最大值:1A Battery Pack Voltage:3.5V 電壓 -?供電（最高）:10.2V 接口:USB 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:10-WFDFN 裸露焊盤 供應商器件封裝:10-WSON（3x2） 標準包裝:1 |
| BQ25071EVM-658 | 功能描述:BQ25071 - Power Management, Battery Charger Evaluation Board 制造商:texas instruments 系列:- 零件狀態(tài):有效 主要用途:電源管理，電池充電器 嵌入式:- 使用的 IC/零件:BQ25071 主要屬性:- 輔助屬性:LED 狀態(tài)指示器 所含物品:板 標準包裝:1 |
發(fā)布緊急采購，3分鐘左右您將得到回復。