- 您現在的位置：買賣IC網 > PDF目錄377763 > LTC1730-4 (LINEAR TECHNOLOGY CORP) Lithium-Ion Battery Pulse Charger(4.1V鋰離子電池脈沖充電器) PDF資料下載
參數資料
| 型號： | LTC1730-4 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Lithium-Ion Battery Pulse Charger(4.1V鋰離子電池脈沖充電器) |
| 中文描述： | 1 A BATTERY CHARGE CONTROLLER, PDSO16 |
| 封裝： | SSOP-16 |
| 文件頁數： | 6/12頁 |
| 文件大?。?/td> | 166K |
| 代理商： | LTC1730-4 |
LTC1730-4/LTC1730-4.2
6
OPERATIOU
Stop Charging
The charger is off when any of the following conditions
exist. The voltage at the V
CC
pin is less than 40mV above
V
BAT
(sleep mode), or the potential at the NTC/SHDN pin
is lower than 50mV (shutdown mode). The charge pump
and the internal pass transistor are both turned off. The
internal resistor divider is also disconnected to reduce the
current drain on the battery when in sleep mode.
Input Voltage (Wall Adapter)
The input voltage to the LTC1730 must have some
method of current limit capability.
The current limit level
should be lower than the maximum charge current set by
the sense resistor (I
MAX
= 100mV/R
SENSE
). If a wall
adapter without current limit is used, or the current limit
level is above I
MAX
, the charger will turn on and then turn
off immediately after the overcurrent condition is de-
tected. This cycle will be resumed every 400ms (C
TIMER
=
0.1
μ
F) until the total charge time has run out. If overcurrent
protection is not needed, short the SENSE pin to V
CC
.
Trickle Charge and Defective Battery Detection
At the begining of the charge cycle, if the cell voltage is low
(less than 2.45V) the charger goes into a 40mA trickle
charge mode. If the low cell voltage persists for one
quarter of the total charge time, the battery is considered
defective and the charge cycle will be terminated. The
CHRG pin output is then forced to a high impedance state.
Battery Charge Current
The battery charge current is determined by the current
limit of the input supply (wall adapter).
However, this
current should not exceed the maximum charge current,
I
MAX
. If an overcurrent condition is detected, the charging
is terminated immediately, the GATE pin is pulled down to
ground and the charge pump is turned off. The charging
will resume after a 400ms time off with C
TIMER
= 0.1
μ
F.
Programming the Timer
The programmable timer is used to terminate the charge
and sets the minimum ON/OFF time and the overcurrent
APPLICATIU
W
U
U
When the cell voltage exceeds 2.45V, the charger goes
into the fast charge mode. In this mode, the charge pump
is turned on and ramps up the gate voltage of the pass
transistor. The voltage at the V
CC
pin will then ramp-down
to V
BAT
plus the voltage drop across the pass transistor
and R
SENSE
, thus reducing the power dissipation of the
pass transistor. The charge current is determined by the
current limit of the input supply.
Once the battery voltage reaches the final float voltage, the
pass transistor turns off for 100ms (minimum off-time). It
remains off if the battery voltage stays above the float
voltage after the 100ms off-time. After the off-time, if the
battery voltage drops below the float voltage, the pass
transistor is turned back on for at least 380ms (minimum
on-time). As the battery is approaching full charge, the off-
time will get longer and the on-time will stay at 380ms. The
voltage at the BAT pin will be higher than the final float
voltage due to the ESR associated with the battery pack.
This voltage level should not turn on the overvoltage
protection circuitry often located in the battery pack. When
the duty cycle at the GATE pin drops to 10%, a comparator
will turn off the N-FET at the CHRG pin and connect a weak
current source (40
μ
A) to ground to indicate an end-of-
charge (
C
/10) condition. The pulse charging will continue
until a time-out occurs.
An external capacitor at the TIMER pin sets the total charge
time, the minimum on- and off-time and the overcurrent
retry period. After a time-out has occurred, the charging
will be terminated immediately and the CHRG pin is forced
to a high impedance state. To restart the charge cycle,
momentarily force the voltage at the NTC/SHDN pin to less
than 50mV or remove and reapply the input voltage
source. After the charging stops, if the battery voltage
drops below 3.8V/cell, due to external loading or internal
leakage, a charge cycle will automatically resume.
The charger can be shut down by pulling the NTC/SHDN
pin to ground. When the input voltage is not present, the
charger goes into a sleep mode, dropping battery drain
current to less than 1
μ
A.
相關PDF資料 |
PDF描述 |
|---|---|
| LTC1730ES8-4.2 | Lithium-Ion Battery Pulse Charger with Overcurrent Protection |
| LTC1730-4.2 | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT01; No. of Contacts:5; Connector Shell Size:14; Connecting Termination:Solder; Circular Shell Style:Cable Receptacle; Body Style:Straight |
| LTC1730EGN-4 | Lithium-Ion Battery Pulse Charger with Overcurrent Protection |
| LTC1731-4.2 | Lithium-Ion Linear Battery Charger Controller(4.2V鋰離子線性電池充電器) |
| LTC1733 | Monolithic Linear Lithium-Ion Battery Charger with Thermal Regulation |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC1730EGN-4 | 功能描述:IC BATT PULSE CHRGR LI-ION16SSOP 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 |
| LTC1730EGN-4#PBF | 功能描述:IC BATT PULSE CHRGR LI-ION16SSOP 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 |
| LTC1730EGN-4#TR | 功能描述:IC BATT PULSE CHRGR LI-ION16SSOP 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 |
| LTC1730EGN-4#TRPBF | 功能描述:IC BATT PULSE CHRGR LI-ION16SSOP 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 |
| LTC1730ES8-4.2 | 功能描述:IC BATT PULSE CHRGR LI-ION 8SOIC 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。