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參數(shù)資料
| 型號： | LTC4010EFE |
| 廠商： | Linear Integrated Systems |
| 英文描述： | High Efficiency Standalone Nickel Battery Charger |
| 中文描述： | 高效率的獨(dú)立鎳電池充電器 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 205K |
| 代理商： | LTC4010EFE |
17
LTC4010
4010p
APPLICATIOU
and is 500mV above BAT. The READY output is asserted
when the LTC4010 completes charge qualification.
When the LTC4010 determines charging should begin, it
starts a precharge cycle because V
CELL
is less than 900mV.
As long as the temperature remains within prescribed
limits, the LTC4010 charges (TGATE switching), applying
limited current to the battery with the PWM in order to
bring the average cell voltage to 900mV.
When the precharge state timer expires, the LTC4010 be-
gins fast charge if V
CELL
is greater than 900mV. The PWM,
charge timer and internal termination control are sus-
pended if pause is asserted (V
CELL
< 200mV), but all status
outputs continue to indicate charging is in progress. The
fast charge state continues until the selected voltage or
temperature termination criteria are met. Figure 9 sug-
gests termination based on
T/
t, which for NiMH would
be an increase of 1
°
C per minute.
Because NiMH charging terminated due to
T/
t and the
fast charge cycle had lasted more than t
MAX
/12 minutes,
the LTC4010 begins a top-off charge with a current of
I
PROG
/10. Top-off is an internally timed charge of t
MAX
/3
minutes with the CHRG output continuously asserted.
Finally, the LTC4010 enters the automatic recharge state
where the CHRG output is deasserted. The PWM is dis-
abled but V
CDIV
remains asserted to monitor V
CELL
. The
charge timer will be reset and fast charging will resume if
V
CELL
drops below 1.325V. The LTC4010 enters shutdown
when the DC adapter is removed, minimizing current draw
from the battery in the absence of an input power source.
While not a part of the sample waveforms of Figure 9,
temperature qualification is an ongoing part of the charg-
ing process, if an external thermistor network is detected
by the LTC4010. Should prescribed temperature limits be
exceeded during any particular charging state, charging
would be suspended until the sensed temperature re-
turned to an acceptable range.
W
U
U
Battery-Controlled Charging
Because of the programming arrangement of the LTC4010,
it may be possible to configure it for battery-controlled
charging. In this case, the battery pack is designed to
provide customized information to an LTC4010-based
charger, allowing a single design to service a wide range
of application batteries. Assume the charger is designed to
provide a maximum charge current of 800mA (R
SENSE
=
125m
). Figure 10 shows a 5V NiCd battery pack for
which 800mA represents a 0.75C rate. When connected to
the charger, this pack would provide battery temperature
information and correctly configure both fast charge ter-
mination parameters and time limits for the internal NiCd
cells.
A second possibility is to configure an LTC4010-based
charger to accept battery packs with varying numbers of
cells. By including R2 of the average cell voltage divider
network shown in Figure 3, battery-based programming
of the number of series-stacked cells could be realized
without defeating LTC4010 detection of battery insertion
or removal. Figure 11 shows a 2.5V NiMH battery pack that
programs the correct number of series cells when it is
connected to the charger, along with indicating chemistry
and providing temperature information.
Any of these battery pack charge control concepts could
be combined in a variety of ways to service custom
application needs.
Figure 10. NiCd Battery Pack with Time Limit Control
5
1200mAhr
NiCd CELLS
BATTERY
PACK
V
TEMP
3
CHEM
8
TIMER
NC
66.5k
4010 F10
+
–
10k
NTC
Figure 11. NiMH Battery Pack Indicating Number of Cells
5
1500mAhr
NiMH CELLS
BATTERY
PACK
V
TEMP
6
V
CELL
R2
3
CHEM
4010 F11
+
–
10k
NTC
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4011 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4011_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4011CFE | 功能描述:IC BATT CHARGER HIEFF 20TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| LTC4011CFE#PBF | 功能描述:IC BATT CHARGER HIEFF 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTC4011CFE#TR | 功能描述:IC BATT CHARGER HIEFF 20TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
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