- 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)： | 3/21頁 |
| 文件大小： | 664K |
| 代理商： | BQ25070DQCR |
IM ON
IN
V
= I
1
A
R2
RHOT
(0.125
1)
R1 =
0.125
(R2 + RHOT)
-
-
RHOT
RCOLD
(0.125
0.250)
R2 =
RHOT
0.250
(0.125
1) + RCOLD
0.125
(1
0.250)
-
-
-
-
SLUSA66
– JULY 2011
Fast Charge Mode
Once VBAT > VLOWV, the bq25070 enters constant current (CC) mode where charge current is regulated using the
internal MOSFETs between IN and OUT. The total current is shared between the output load and the battery.
Once the battery voltage charges up to VBAT(OVCH), the CHG output goes high indicating the charge cycle is
complete and the bq25070 switches the battery regulation voltage to VBAT(REG). The battery voltage is allowed to
relax down to VBAT(REG). The charger remains enabled and regulates the output to VBAT(REG). If at any time the
battery falls below VREC, the charge cycle restarts.
CHARGE CURRENT TRANSLATOR (IMON)
When the charger is enabled, internal circuits generate a current proportional to the charge current at the IMON
input. The current out of IMON is 1/1000 (
±10%) of the charge current. This current, when applied to the external
charge current programming resistor, R1 (Figure 12), generates an analog voltage that can be monitored by an
external host to calculate the current sourced from BAT. Connect a 1k
Ω resistor from IMON to GND. The voltage
at IMON is calculated as:
(1)
INPUT OVER VOLTAGE PROTECTION
The bq25070 contains an input over voltage protection circuit that disables the LDO output and charging when
the input voltage rises above VOVP. This prevents damage from faulty adapters. The OVP circuitry contains an
115
μs deglitch that prevents ringing on the input from line transients from tripping the OVP circuitry falsely. If an
adapter with an output greater than VOVP is plugged in, the IC completes soft-start power up and then shuts
down if the voltage remains above VOVP after 115μs. The LDO remains off and charging remains disabled until
the input voltage falls below VOVP.
UNDER-VOLTAGE LOCKOUT (UVLO)
The bq25070 remains in power down mode when the input voltage is below the under-voltage lockout threshold
(VUVLO). During this mode, the control input (CTRL) is ignored. The LDO, the charge FET connected between IN
and OUT are off and the status output (CHG) is high impedance. Once the input voltage rises above VUVLO, the
internal circuitry is turned on and the normal operating procedures are followed.
EXTERNAL NTC MONITORING (TS)
The bq25070 features a flexible, voltage based external battery pack temperature monitoring input. The TS input
connects to the NTC thermistor in the battery pack to monitor battery temperature and prevent dangerous
over-temperature conditions. During charging, the voltage at TS is continuously monitored. If, at any time, the
voltage at TS is outside of the operating range (VCOLD to VHOT), charging is suspended. When the voltage
measured at TS returns to within the operation window, charging is resumed. When charging is suspended due
to a battery pack temperature fault, the CHG output remains low and continues to indicate charging.
The temperature thresholds are programmed using a resistor divider from LDO to GND with the NTC thermistor
connected to the center tap from TS to GND. See Figure 14 for the circuit example. The value of R1 and R2 are
calculated using the following equations:
(2)
(3)
RHOT is the expected thermistor resistance at the programmed hot threshold; RCOLD is the expected thermistor
resistance at the programmed cold threshold.
Copyright
2011, Texas Instruments Incorporated
11
相關(guān)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(guān)代理商/技術(shù)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(chǎn)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(xué):磷酸鐵鋰 電池?cái)?shù):1 電流 - 充電:恒流 - 可編程 可編程特性:- 故障保護(hù):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(yīng)商器件封裝:10-WSON（3x2） 標(biāo)準(zhǔn)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(xué):磷酸鐵鋰 電池?cái)?shù):1 Current Charging:恒流 - 可編程 可編程特性:- 故障保護(hù):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(yīng)商器件封裝:10-WSON（3x2） 標(biāo)準(zhǔn)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(biāo)準(zhǔn)包裝:1 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。