- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377763 > LTC1730EGN-4 (LINEAR TECHNOLOGY CORP) Lithium-Ion Battery Pulse Charger with Overcurrent Protection PDF資料下載
參數(shù)資料
| 型號： | LTC1730EGN-4 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Lithium-Ion Battery Pulse Charger with Overcurrent Protection |
| 中文描述： | BATTERY CHARGE CONTROLLER, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 157K |
| 代理商： | LTC1730EGN-4 |
LTC1730-4/LTC1730-4.2
10
1730f
Surface mount packages rely primarily on the copper leads
(pins) to conduct the heat from the package to the sur-
rounding PC board copper which is acting as a heat sink.
The ground pin is especially important for conduct
ing heat
as well as providing an electrical connection. Use gener-
ous amounts of copper around the ground pin and also
consider feedthrough vias (plated through holes) to back-
side or inner copper layers to maximize power dissipation.
Table 1 lists the thermal resistance for the SO-8 package.
Measured values of thermal resistance for several differ-
ent board sizes and copper areas are listed. All measure-
ments were taken in still air on 0.062" FR-4 board with one
ounce copper.
Calculating Junction Temperature
Example: Find the maximum junction temperature for a
battery voltage of 4V (V
CC
will collapse to approximately
V
BAT
in the fast charge mode), charge current of 1A and a
maximum ambient temperature of 75
°
C.
The power dissipated by the IC is:
P = (I
BAT
I
BAT
R
DS(ON)
) + (V
CC
I
CC
)
= (1A 1A 0.35
) + (4V 1mA)
= 0.35 + 0.004
= 0.354W
The SO-8 package for the LTC1730 features a special lead
frame with a lower thermal resistance and higher allow-
able power dissipation. The junction-to-ambient thermal
resistance of this package when soldered to a PC board is
approximately 80
°
C/W depending on the copper area. So
the junction temperature rise above ambient will be
approximately:
(0.354W)(80
°
C/W) = 28.3
°
C
The maximum junction temperature is equal to the maxi-
mum junction temperature rise above ambient plus the
maximum ambient temperature or:
T
JMAX
= 75
°
C + 28.3
°
C = 103.3
°
C
Table 1. SO-8 Package Thermal Resistance
COPPER AREA
TOPSIDE
BACKSIDE
2500mm
2
2500mm
2
1000mm
2
2500mm
2
250mm
2
2500mm
2
TOTAL
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
80
°
C/W
80
°
C/W
85
°
C/W
BOARD AREA
2500mm
2
2500mm
2
2500mm
2
*Device is mounted on topside.
Output Voltage Selection (LTC1730EGN-4)
The float voltage at the BAT pin can be selected by the SEL
pin. Shorting the SEL pin to ground will set the float
voltage to 4.1V, while connecting it to V
CC
sets it to 4.2V.
This feature allows the charger to be used with different
types of Li-Ion cells.
ACPR Output Pin (LTC1730EGN-4)
When the input voltage is 40mV higher than the voltage at
the BAT pin, the ACPR pin is pulled low to ground to
indicate that the input supply (wall adapter) is applied.
After the input supply is removed, this pin becomes high
impedance. An internal 80ms delay prevents the LTC1730
from turning off if the voltage at the V
CC
pin rings and gets
too close to V
BAT
because of the parasitic inductance.
FAULT Output Pin (LTC1730EGN-4)
The FAULT pin is pulled to ground when either one of the
following conditions is detected:
1. The voltage at the NTC/SHDN pin is out of the operation
range. With a 10k negative temperature coefficient
thermistor placed near the battery pack, this pin indi-
cates that the temperature of the pack is either too cold
or too hot and the charger is suspended. Once the
temperature is back to the operational range, the FAULT
pin becomes high impedance and the charging re-
sumes.
2. The voltage at the BAT pin stays below 2.45V for 1/4 of
the programmed charge time. If V
BAT
remains low even
with 35mA of trickle charge current for 1/4 of the total
APPLICATIU
W
U
U
相關PDF資料 |
PDF描述 |
|---|---|
| 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 |
| LTC1733EMSE | Monolithic Linear Lithium-Ion Battery Charger with Thermal Regulation |
| LTC1734 | Lithium-Ion Linear Battery Charger in SOT-23(鋰離子線性電池充電器（SOT-23封裝）) |
| LTC1735IS | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LTC1730ES8-4.2#PBF | 功能描述:IC BATT PULSE CHRGR LI-ION 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學: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） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
發(fā)布緊急采購，3分鐘左右您將得到回復。