參數(shù)資料
型號(hào)： L6924D013TR
廠商： STMICROELECTRONICS
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16
封裝： 3 X 3 MM, VFQFPN-16
文件頁(yè)數(shù)： 16/38頁(yè)
文件大?。?/td> 1454K
代理商： L6924D013TR
L6924D
Application information: monitoring and protection
Doc ID 11908 Rev 9
23/38
8
Application information: monitoring and protection
The L6924D uses a VFQFPN 3 mm x 3 mm 16-pin package with an exposed pad that
allows the user to have a compact application and good thermal behavior at the same time.
The L6924D has a low thermal resistance because of the exposed pad (approximately
75°C/W, depending on the board characteristics). Moreover, a built-in thermal protection
feature prevents the L6924D from having thermal issues typically present in a linear charger.
Thermal control is implemented with a thermal loop that reduces the charge current
automatically when the junction temperature reaches approximately 120 °C. This avoids
further temperature rise and keeps the junction temperature constant. This simplifies the
thermal design of the application as well as protects the device against over-temperature
damage.
The Figure 18 shows how the thermal loop acts (with the dotted lines), when the junction
temperature reaches 120°C.
8.1
NTC thermistor
The device allows designers to monitor the battery temperature by measuring the voltage
across an NTC or PTC resistor. Li-Ion batteries have a narrow range of operating
temperature, usually from 0°C to 50 °C. This window is programmable by an external divider
which is comprised of an NTC thermistor connected to GND and a resistor connected to
VREF. When the voltage on the TH pin exceeds the minimum or maximum voltage threshold
(internal window comparator), the device stops the charge process, and indicates a fault
condition through the status pin.
Figure 18.
Power dissipation both linear and quasi pulse mode with thermal loop
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6924U 功能描述:電池管理 USB Battery Charger System w/integra RoHS:否 制造商:Texas Instruments 電池類(lèi)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
L6924U013TR 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
L6924UTR 功能描述:電池管理 Battery Charger USB Compatible RoHS:否 制造商:Texas Instruments 電池類(lèi)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
L6925 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR
L6925013TR 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR
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