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參數(shù)資料
| 型號(hào)： | LTC4070EDDB#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-8 |
| 文件頁(yè)數(shù)： | 16/16頁(yè) |
| 文件大?。?/td> | 214K |
| 代理商： | LTC4070EDDB#TRPBF |
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LTC4070
9
4070fc
applicaTions inForMaTion
Figure 3. 2-Cell Battery Charger
Figure 4. 2-Cell Battery Charger with Boosted Drive
LTC4070
ADJ
RIN
GND
WALL
ADAPTER
FLOAT
IF NOT NEEDED
FLOAT
IF NOT NEEDED
FLOAT
Li-Ion
BATTERY
NTCBIAS
NTC
VCC
VCC1
+
4070 F03
LTC4070
ADJ
GND
Li-Ion
BATTERY
NTCBIAS
NTC
VCC
VCC2
+
LTC4070
ADJ
RIN
GND
WALL
ADAPTER
FLOAT
IF NOT NEEDED
FLOAT
IF NOT NEEDED
FLOAT
Li-Ion
BATTERY
NTCBIAS
DRV
Q1
NTC
VCC
VCC1
VCC2
+
4070 F04
LTC4070
ADJ
GND
Li-Ion
BATTERY
NTCBIAS
Q1, Q2: Si3469DV
DRV
Q2
NTC
VCC
+
Figure 2. Single-Cell Charger with Boosted Drive
4070 F02
LTC4070
ADJ
Q1: FDN352AP
RIN
110
4W
GND
24V WALL
ADAPTER
Li-Ion
BATTERY
NTCBIAS
DRV
Q1
NTC
VCC
+
FLOAT
IF NOT NEEDED
Figure 2 shows a charge circuit that can boost the charge
current as well as the shunt current with an external
P-channel MOSFET, Q1. In this case, if the wall adapter
voltage (VWALL) is 24V and the minimum battery voltage
(VBAT) is 3V, then the initial charge current is set to 191mA
by selecting RIN = 110. Note that this resistor dissipates
over4Wofpower,soselecttheresistortakingpowerrating
into account. When the battery voltage reaches the float
voltage, the LTC4070 and the external P-channel MOSFET
begin to shunt current from the wall adapter. Eventually,
the LTC4070 and the external P-channel MOSFET shunts
all available current (182mA) and no current flows to the
battery. Take the full shunt current and power into account
when selecting the external MOSFET.
TheLTC4070canalsobeusedtoregulateseries-connected
battery stacks as illustrated in Figures 3 and 4. Here two
LTC4070devicesareusedtochargetwobatteriesinseries;
with or without boosted drive. A single resistor sets the
maximum charge/shunt current. The GND pin of the top
device is simply connected to the VCC pin of the bottom
device. Care must be taken in observing the status output
pins of the top device as these signals are not ground ref-
erenced. Also, the wall adapter must have a high enough
voltage rating to charge both cells.
NTC Protection
TheLTC4070measuresbatterytemperaturewithanegative
temperaturecoefficientthermistorthermallycoupledtothe
battery.NTCthermistorshavetemperaturecharacteristics
which are specified in resistance-temperature conversion
tables. Internal NTC circuitry protects the battery from
excessive heat by reducing the float voltage for each
10°C rise in temperature above 40°C (assuming a Vishay
thermistor with a B25/85 value of 3490).
The LTC4070 uses a ratio of resistor values to measure
batterytemperature.TheLTC4070containsaninternalfixed
resistorvoltagedividerfromNTCBIAStoGNDwithfourtap
points; NTCTH1-NTCTH4. The voltages at these tap points
are periodically compared against the voltage at the NTC
pin to measure battery temperature. To conserve power,
thebatterytemperatureismeasuredperiodicallybybiasing
the NTCBIAS pin to VCC about once every 1.5 seconds.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4070EMS8E | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Li-Ion/Polymer Shunt Battery Charger System |
| LTC4070EMS8E#PBF | 功能描述:IC LIION/POLY BATT CHARGER 8MSOP 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(cè)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 |
| LTC4070EMS8E#PBF | 制造商:Linear Technology 功能描述:BATTERY CHARGER IC |
| LTC4070EMS8E#TRPBF | 功能描述:IC BATT CHRGR LIION/POLY 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):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(pán) 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤(pán) 包裝:管件 |
| LTC4070EMS8EPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Li-Ion/Polymer Shunt Battery Charger System |
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