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參數(shù)資料
| 型號(hào)： | LTC1732EMS-4.2#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁(yè)數(shù)： | 2/12頁(yè) |
| 文件大?。?/td> | 170K |
| 代理商： | LTC1732EMS-4.2#TR |
10
LTC1732-4/LTC1732-4.2
Li-Ion Linear Charger Using a PNP Transistor
TYPICAL APPLICATIO S
U
VCC
VIN = 6V
SENSE
DRV
R2
1k
RSENSE
0.2
R3
10k
RPROG
19.6k
4.1V
Li-Ion
CELL
LTC1732-4
BAT
CHRG
9
8
MBRM120T3
C2
10
F
C1
1nF
1732 TA02
C3
1
F
IBAT = 500mA
+
CTIMER
0.1
F
Q1
2N5087
7
1
6
5
3
4
TIMER
PROG
GND
2
SEL
ACPR
10
R1
1k
Q2
ZTX749
Gate Drive
Typically the LTC1732 controls an external P-channel
MOSFET to supply current to the battery. An external PNP
transistor can also be used as the pass transistor instead
of the P-channel MOSFET. Due to the low transconductance
of the current amplifier (CA), a high gain Darlington PNP
transistor is required to avoid excessive charge current
error. The transconductance of the current amplifier is
around 0.6
A/mV. For every 1A of base current, a 1.6mV
of gain error shows up at the inputs of CA. With RPROG =
19.6k (100mV across RSENSE). This represents a 1.6%
error in charge current.
Constant-Current Only Mode
The LTC1732 can be used as a programmable current
source by connecting the TIMER pin to VCC. This is
particularly useful for charging NiMH or NiCd batteries. In
the constant-current only mode, the timer and voltage
APPLICATIONS INFORMATION
WU
U
amplifier are both disabled. An external termination method
is required to properly terminate the charging by floating
the PROG pin.
Stability
The charger is stable without any compensation when a
P-channel MOSFET is used as the pass transistor and
the battery is present. A 10
F tantalum capacitor is
recommended at the BAT pin to keep the ripple voltage
low when the battery is disconnected. A ceramic output
capacitor may also be used, but because of the very low
ESR and high Q characteristics of multilayer ceramic
capacitors, it may be necessary to add a 1
resistor in
series with the ceramic capacitor to improve voltage
mode stability.
If a PNP transistor is used for the pass transistor, a 1000pF
capacitor is required from the DRV pin to VCC. To help
stablize the voltage loop a 10
F tantalum capacitor at the
BAT pin is also recommended when a battery is not
present.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1732EMS-8.4 | 制造商:Linear Technology 功能描述:Charge Controller Li-Ion/NiCD/NiMH 500mA 8.4V 10-Pin MSOP |
| LTC1732EMS-8.4#PBF | 功能描述:IC BATTCHRG CNTRLR LI-ION 10MSOP RoHS:是 類(lèi)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(lèi)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(chēng):497-10526-2 |
| LTC1732EMS-8.4#PBF | 制造商:Linear Technology 功能描述:Battery Management IC |
| LTC1732EMS-8.4#TR | 功能描述:IC BATTCHRG CNTRLR LI-ION 10MSOP RoHS:否 類(lèi)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(lèi)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 |
| LTC1732EMS-8.4#TRPBF | 功能描述:IC CTRLR BATT CHRG LI-ION 10MSOP RoHS:是 類(lèi)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(lèi)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 |
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