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參數(shù)資料
| 型號： | LTC1731-8.2 |
| 廠商： | 光寶科技股份有限公司 |
| 英文描述： | LITHIUM - LON LINEAR BATTERY CHARGER CONTROLLER |
| 中文描述： | 鋰-倫敦股票交易所線性電池充電控制器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 175K |
| 代理商： | LTC1731-8.2 |
7
LTC1731-8.2/LTC1731-8.4
sn1731 17318fs
OPERATIOU
The LTC1731-8.2/LTC1731-8.4 are linear battery charger
controllers. The charge current is programmed by the
combination of a program resistor (R
PROG
) from the
PROG pin to ground and a sense resistor (R
SENSE
) be-
tween the V
CC
and SENSE pins. R
PROG
sets a program
current through an internal trimmed 800
resistor that
creates a voltage drop from V
CC
to the input of the current
amplifier (CA). The current amplifier servos the gate of the
external P-channel MOSFET to force the same voltage
drop across R
SENSE
which sets the charge current. When
the potential at the BAT pin approaches the preset float
voltage, the voltage amplifier (VA) will start sinking cur-
rent which shrinks the voltage drop across R
SENSE
, thus
reducing the charge current.
Charging begins when the potential at V
CC
pin rises above
the UVLO level and a program resistor is connected from
the PROG pin to ground. At the beginning of the charge
cycle, if the battery voltage is below 4.95V, the charger
goes into trickle charge mode. The trickle charge current
is 10% of the full-scale current. If the cell voltage stays low
for one quarter of the total charge time, the charge
sequence will terminate.
The charger goes into the fast charge constant-current
mode after the voltage on the BAT pin rises above 4.95V.
In constant-current mode, the charge current is set by the
combination of R
SENSE
and R
PROG
.
When the battery approaches the final float voltage, the
charge current will begin to decrease. When the current
drops to 10% of the full-scale charge current, an internal
comparator will turn off the N-channel MOSFET at the
CHRG pin and connect a weak current source to ground to
indicate a near end-of-charge (
C
/10) condition.
An external capacitor on the TIMER pin sets the total
charge time. After a time-out occurs, the charge cycle is
terminated and the CHRG pin is forced to a high imped-
ance state. To restart the charge cycle, simply remove the
input voltage and reapply it, or float the PROG pin momen-
tarily.
For batteries like lithium-ion that require an accurate final
float potential, the internal 2.457V reference, voltage
amplifier and the resistor divider provide regulation with
±
1% (max) accuracy. For NiMH and NiCd batteries, the
LTC1731-8.2/LTC1731-8.4
can be turned into a current
source by pulling the TIMER pin to V
CC
. When in the
constant-current only mode, the voltage amplifier, timer
and the trickle charge function are all disabled.
The charger can be shut down by floating the PROG pin
(I
CC
≈
1mA). An internal current source will pull it high and
clamp at 3.5V.
When the input voltage is not present, the charger goes
into a sleep mode, dropping I
CC
to 15
μ
A. This greatly
reduces the current drain on the battery and increases the
standby time.
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| LTC1731EMS8-4.1 | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1731EMS8-4.1#PBF | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1731EMS8-4.1#TR | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1731EMS8-4.1#TRPBF | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1731EMS8-4.2 | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
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