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參數(shù)資料
| 型號： | BQ24630RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, PQCC24 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, VQFN-24 |
| 文件頁數(shù)： | 7/33頁 |
| 文件大?。?/td> | 1893K |
| 代理商： | BQ24630RGET |
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ACSET
DPM
AC
V
I
=
20
R
ISET2
TERM
SR
V
I
=
100
R
CHARGE
TTC
t
= C
K
www.ti.com
SLUS894 – JANUARY 2010
PRECHARGE
On power-up, if the battery voltage is below the VLOWV threshold, the bq24630 applies 125mA precharge current
to the battery(1). The precharge feature is intended to revive deeply discharged cells. If the VLOWV threshold is not
reached within 30 minutes of initiating precharge, the charger turns off and a FAULT is indicated on the status
pins.
INPUT ADAPTER CURRENT REGULATION
The total input from an AC adapter or other DC sources is a function of the system supply current and the battery
charging current. System current normally fluctuates as portions of the systems are powered up or down. Without
Dynamic Power Management (DPM), the source must be able to supply the maximum system current and the
maximum charger input current simultaneously. By using DPM, the input current regulator reduces the charging
current when the input current exceeds the input current limit set by ACSET. The current capability of the AC
adaptor can be lowered, reducing system cost.
Similar to setting battery regulation current, adaptor current is sensed by resistor RAC connected between ACP
and ACN. Its maximum value is set by ACSET using Equation 3:
(3)
VACSET, the input voltage range of ACSET is between 0 and 2V. The ACP and ACN pins are used to sense
voltage across RAC with default value of 10m. However, resistors of other values can also be used. A larger the
sense resistor will give a larger sense voltage, and a higher regulation accuracy; but, at the expense of higher
conduction loss.
CHARGE TERMINATION, RECHARGE, AND SAFETY TIMER
The bq24630 monitors the charging current during the voltage regulation phase. When VTTC is valid, termination
is detected while the voltage on the VFB pin is higher than the VRECH threshold AND the charge current is less
(4)
VISET2, the input voltage of ISET2 is between 0 and 2V. The minimum termination current is clamped to be
around 125mA with default 10m
sensing resistor. To avoid early termination during WARM/COOL condition, set
ITERM ≤ ICHARGE/10. As a safety backup, the bq24630 also provides a programmable charge timer. The charge
time is programmed by the capacitor connected between the TTC pin and GND, and is given by Equation 5
(5)
where CTTC (range from 0.047F to 0.47F to give 1-10hr safety timer) is the capacitor connected from TTC pin
to GND, and KTTC is the constant multiplier (1.4min/nF).
A new charge cycle is initiated and safety timer is reset when one of the following conditions occur:
The battery voltage falls below the recharge threshold.
A power-on-reset (POR) event occurs.
CE is toggled.
The TTC pin may be taken LOW to disable termination and to disable the safety timer. If TTC is pulled to VREF,
the bq24630 will continue to allow termination but disable the safety timer. TTC taken low will reset the safety
timer. When ACOV, VCCLOWV and SLEEP mode resume normal, the safety timer will be reset.
(1)
assuming a 10m
sense resistor. 1.25mV will be regulated across SRP-SRN, regardless of the value of the sense resistor.
Copyright 2010, Texas Instruments Incorporated
15
Product Folder Link(s): bq24630
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| BQ24630RGET | 制造商:Texas Instruments 功能描述:BATTERY CHARGER IC |
| BQ24640EVM | 功能描述:電源管理IC開發(fā)工具 Eval Mod for BQ24640 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 |
| BQ24640RVAR | 功能描述:電池管理 Hi Eff Synch Sw-Mode Batt Charge Cntrlr 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 |
| BQ24640RVAT | 功能描述:電池管理 Hi Eff Synch Sw-Mode Batt Charge Cntrlr 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 |
| BQ24650EVM-639 | 功能描述:電源管理IC開發(fā)工具 BQ24650 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 |
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