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參數(shù)資料
| 型號(hào)： | 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)： | 8/33頁 |
| 文件大?。?/td> | 1893K |
| 代理商： | BQ24630RGET |
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SLUS894 – JANUARY 2010
www.ti.com
POWER UP
The bq24630 uses a SLEEP comparator to determine the source of power on the VCC pin, since VCC can be
supplied either from the battery or the adapter. If the VCC voltage is greater than the SRN voltage, bq24630 will
enable the ACFET and disable BATFET. If all other conditions are met for charging, bq24630 will then attempt to
charge the battery (See Enabling and Disabling Charging). If the SRN voltage is greater than VCC, indicating
that the battery is the power source, bq24630 enables the BATFET, and enters a low quiescent current (<15mA)
SLEEP mode to minimize current drain from the battery.
If VCC is below the UVLO threshold, the device is disabled, ACFET turns off and BATFET turns on.
ENABLE AND DISABLE CHARGING
The following conditions have to be valid before charge is enabled:
CE is HIGH
The device is not in Under-Voltage-Lockout (UVLO) and not in VCCLOWV mode
The device is not in SLEEP mode
The VCC voltage is lower than the AC over-voltage threshold (VCC < VACOV)
30 ms delay is complete after initial power-up
The REGN LDO and VREF LDO voltages are at the correct levels
Thermal Shut (TSHUT) is not valid
TS fault is not detected
One of the following conditions will stop on-going charging
CE is LOW
Adapter is removed, causing the device to enter UVLO, VCCLOWV, or SLEEP mode
Adapter is over voltage
The REGN or VREF LDOs are overloaded
TSHUT IC temperature threshold is reached (145°C on rising-edge with 15°C hysteresis)
TS voltage goes out of range indicating the battery temperature is too hot or too cold
TTC saftey timer times out
SYSTEM POWER SELECTOR
The bq24630 automatically switches adapter or battery power to the system load. The battery is connected to the
system by default during power up or during SLEEP mode. The battery is disconnected from the system and
prevents shoot-through currents when the selectors switch.
The ACDRV is used to drive a pair of back-to-back p-channel power MOSFETs between adapter and ACP with
sources connected together and to VCC. The FET connected to adapter prevents reverse discharge from the
battery to the adapter when turned off. The p-channel FET with the drain connected to the adapter input provides
reverse battery discharge protection when off; and also minimizes system power dissipation, with its low-RDSON,
compared to a Schottky diode. The other p-channel FET connected to ACP separates battery from adapter, and
provides a limited dI/dt when connecting the adapter to the system by controlling the FET turn-on time. The
BATDRV controls a p-channel power MOSFET placed between BAT and system.
When adapter is not detected, the ACDRV is pulled to VCC to keep ACFET off, disconnecting the adapter from
system. BATDRV stays at ACN-6V to connect battery to system.
Approximately 30ms after the device comes out of SLEEP mode, the system begins to switch from battery to
adapter. The break-before-make logic keeps both ACFET and BATFET off for 10s before ACFET turns on. This
prevents shoot-through current or any large discharging current from going into the battery. The /BATDRV is
pulled up to ACN and the ACDRV pin is set to VCC-6V by an internal regulator to turn on p-channel ACFET,
connecting the adapter to the system.
When the adapter is removed, the system waits until VCC drops back to within 200mV above SRN to switch from
adapter back to battery. The break-before-make logic still keeps 10ms dead time. The ACDRV is pulled up to
VCC and the BATDRV pin is set to ACN-6V by an internal regulator to turn on p-channel BATFET, connecting
the battery to the system.
16
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): bq24630
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相關(guān)代理商/技術(shù)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(píng)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(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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