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參數(shù)資料
| 型號： | UCC3952PWTR-1 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | SINGLE-CELL LITHIUM-LON BATTERY PROTECTION IC |
| 中文描述： | 單節(jié)鋰離子電池保護(hù)IC |
| 文件頁數(shù)： | 5/5頁 |
| 文件大?。?/td> | 35K |
| 代理商： | UCC3952PWTR-1 |
5
UCC3952-1/-2/-3/-4
Over Current Monitoring and Protection
Discharge current is continuously monitored via an inter-
nal sense resistor. In the event of excessive current, an
Over Current condition is declared if the high current
(over 3A) persists for over 1ms. This delay allows for
charging of the system bypass capacitors without trip-
ping the overcurrent. A 0.1 F capacitor on the CBPS pin
provides momentary holdup for the IC to assure proper
operation in the event that a hard short suddenly pulls
the cell voltage below the minimum operating voltage.
Once an Over Current condition has been declared, the
internal MOSFET turns off. The only way to return the
pack to normal operation is to remove the load by un-
plugging the pack from the system. The overcurrent is re-
set when an internal pull down brings PACK(–) to within
50mV of BNEG. At this point, the pack returns to its nor-
mal state of operation.
Controlled Charge/Discharge Mode
When the chip senses an over-voltage condition, it pre-
vents any additional charging, but allows discharge. This
is accomplished by activating a linear control loop which
controls the gate of the MOSFET based on the differen-
tial voltage across its drain to source terminals. The lin-
ear loop attempts to regulate the differential voltage
across the MOSFET to 100mV. When a light load is ap-
plied to the part, the loop adjusts the impedance of the
MOSFET to maintain 100mV across it. As the load in-
creases, the impedance of the MOSFET is decreased to
maintain the 100mV control. At heavy loads (still below
“over-current” limit level), the loop will not maintain regu-
lation and will drive the gate of the MOSFET to the bat-
tery voltage (not the charge-pump output voltage). The
MOSFET R
DS(on)
in the over-voltage state will be higher
than R
DS(on)
during normal operation. The voltage drop
(and associated power loss) across the internal MOSFET
in this mode of operation is still significantly lower than
the
typical
solution
of
two
MOSFETs, where the body diode is conducting.
external
back-to-back
When the chip senses an under-voltage condition, it dis-
connects the load from the battery pack and shuts itself
down to minimize current drain from the battery. Several
circuits remain powered and will detect placement of the
battery pack into a charger. Once the charger presence
is detected, the linear loop is activated and the chip al-
lows charging current into the battery. This linear control
mode of operation is in effect until the battery voltage
reaches a level of V
UVR
, at which time normal operation
is resumed.
APPLICATION INFORMATION (cont.)
UNITRODE CORPORATION
7 CONTINENTAL BLVD. MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
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| UCC3952- | Enhanced Single Cell Lithium-Ion Battery Protection IC |
| UCC3952DP-1 | Enhanced Single Cell Lithium-Ion Battery Protection IC |
| UCC3952DP-2 | Enhanced Single Cell Lithium-Ion Battery Protection IC |
| UCC3952PWTR-2 | SINGLE-CELL LITHIUM-LON BATTERY PROTECTION IC |
| UCC3952PWTR-3 | SINGLE-CELL LITHIUM-LON BATTERY PROTECTION IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC3952PWTR-2 | 功能描述:電池管理 Sngl Cell LithiumIon Protection IC 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 |
| UCC3952PWTR-2G4 | 功能描述:電池管理 Sngl Cell LithiumIon Protection IC 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 |
| UCC3952PWTR-3 | 功能描述:電池管理 Sngl Cell LithiumIon Protection IC 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 |
| UCC3952PWTR-3G4 | 功能描述:電池管理 Sngl Cell LithiumIon Protection IC 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 |
| UCC3956DW | 功能描述:電池管理 Switchmode Charge Management IC 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 |
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