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參數(shù)資料
| 型號： | L6924D013TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Battery charger system with integrated power switch for Li-ION/Li-POLYMER |
| 中文描述： | 電池為鋰聚合物集成電源開關(guān)，充電系統(tǒng) |
| 文件頁數(shù)： | 11/38頁 |
| 文件大?。?/td> | 1350K |
| 代理商： | L6924D013TR |
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L6924D
Operation description
11/38
6
Operation description
The L6924D is a fully integrated battery charger that allows a very compact battery
management system for space limited applications. It integrates in a small package, all the
power elements: power MOSFET, reverse blocking diode and the sense resistor.
It normally works as a linear charger when powered from an external voltage regulated adapter.
However, thanks to its very low minimum input voltage (down to 2.5V) the L6924D can also
work as a Quasi-Pulse charger when powered from a current limited adapter. To work in this
condition, is enough to set the device’s charging current higher than the adapter one
(
Chapter 7.4 on page 19
). The advantage of the linear charging approach is that the device has
a direct control of the charging current and so the designer needn’t to rely on the upstream
adapter. However, the advantage of the Quasi-Pulse approach is that the power dissipated
inside the portable equipment is dramatically reduced.
Regards the charging approach, the L6924D charges the battery in three phases:
Pre-Charge constant current:
in this phase (active when the battery is deeply
discharged) the battery is charged with a low current.
Fast-Charge constant current:
in this phase the device charges the battery with the
maximum current.
Constant Voltage:
when the battery voltage is closed to the selected output voltage, the
device starts to reduce the current, until the charge termination is done.
●
●
●
The full flexibility is provided by:
Programmable pre-charging current and voltage thresholds (I
PRETH
and V
PRETH
)
(
Chapter 7.2 on page 18
,
Chapter 7.3 on page 19
).
Programmable fast-charging current (I
CHG
) (
Chapter 7.4 on page 19
).
Programmable end of charge current threshold (I
ENDTH
) (
Chapter 7.5 on page 20
).
Programmable end of charge timer (T
MAXCH
) (
Chapter 7.8 on page 22
).
●
●
●
●
If the full flexibility is not required and a smaller number of external components is preferred,
default values of I
PRETH
and V
PRETH
are available leaving the respective pins floating.
If a PTC or NTC resistor is used, the device can monitor the battery temperature in order
to protect the battery from operating in unsafe thermal conditions.
Beside the good thermal behavior guaranteed by low thermal resistance of the package,
additional safety is provided by the built-in temperature control loop. The IC monitors
continuously its junction temperature. When the temperature reaches approximately
120°C, the thermal control loop starts working, and reduces the charging current, in order
to keep the IC junction temperature at 120°C.
Two open collector outputs are available for diagnostic purpose (status pins ST1 and ST2).
They can be also used to drive external LEDs or to interface with a microcontroller.
The voltage across the resistor connected between I
END
and GND gives information about
the actual charging current (working as a Gas Gauge), and it can be easily fed into a μC
ADC.
●
●
●
●
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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: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:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR |
| L6925013TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR |
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