參數(shù)資料
型號(hào)： L6924D013TR
廠商： STMICROELECTRONICS
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16
封裝： 3 X 3 MM, VFQFPN-16
文件頁數(shù)： 3/38頁
文件大小： 1454K
代理商： L6924D013TR
L6924D
Operation description
Doc ID 11908 Rev 9
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 2.5 V) 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’s one (Chapter 7.4 on page 18). 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.
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 reaches 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 (IPRETH and VPRETH)
●
Programmable fast-charging current (ICHG) (Chapter 7.4 on page 18).
●
Programmable end of charge current threshold (IENDTH) (Chapter 7.5 on page 19).
●
Programmable end of charge timer (TMAXCH) (Chapter 7.8 on page 20).
If the full flexibility is not required and a smaller number of external components is preferred,
default values of IPRETH and VPRETH 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 IEND and GND gives information about
the actual charging current (working as a Gas Gauge), and it can be easily fed into a C
ADC.
相關(guān)PDF資料
PDF描述
L6926D 1.4 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8
L6926Q1TR 1.65 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PDSO8
L6926Q1 1.65 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PDSO8
L6928D 1.65 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO8
L6928TR 1.65 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO8
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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