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參數(shù)資料
| 型號： | LT3652HVEDD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PDSO12 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 250K |
| 代理商： | LT3652HVEDD#PBF |
LT3652HV
14
3652hvf
APPLICATIONS INFORMATION
The minimum average diode current rating (IDIODE(MAX))
is calculated with maximum output current (ICHG(MAX)),
maximum operational VIN, and output at the precondition
threshold (VBAT(PRE), or 0.7 VBAT(FLT)):
IDIODE(MAX) > ICHG(MAX) (VIN(MAX) – VBAT(PRE)) / VIN(MAX)) (A)
For example, a rectifier diode for a 7.2V, 2A charger with
a 25V maximum input voltage would require:
IDIODE(MAX) > 2 (25 – 0.7[7.2]) / 25), or
IDIODE(MAX) > 1.6A
Battery Float Voltage Programming
The output battery float voltage (VBAT(FLT)) is programmed
by connecting a resistor divider from the BAT pin to VFB.
VBAT(FLT) can be programmed up to 18V.
Figure 4. Feedback Resistors from BAT to VFB
Program Float Voltage
BAT
+
VFB
RFB2
RFB1
LT3652HV
3652 F04
Because the battery voltage is across the VBAT(FLT) pro-
gramming resistor divider, this divider will draw a small
amount of current from the battery (IRFB) at a rate of:
IRFB = 3.3 / RFB2
Precision resistors in high values may be hard to ob-
tain, so for some lower VBAT(FLT) applications, it may be
desirable to use smaller-value feedback resistors with an
additional resistor (RFB3) to achieve the required 250k
equivalent resistance. The resulting 3-resistor network,
as shown in Figure 5, can ease component selection
and/or increase output voltage precision, at the expense of
additional current through the feedback divider.
For a three-resistor network, RFB1 and RFB2 follow the
relation:
RFB2/RFB1 = 3.3/(VBAT(FLT) – 3.3)
Example:
For VBAT(FLT) = 3.6V:
RFB2/RFB1 = 3.3/(3.6 - 3.3) = 11.
Setting divider current (IRFB) = 10μA yields:
RFB2 = 3.3/10μA
RFB2 = 330k
Solving for RFB1:
RFB1 = 330k/11
RFB1 = 30k
The divider equivalent resistance is:
RFB1||RFB2 = 27.5k
BAT
+
VFB
RFB2
RFB3
RFB1
LT3652HV
3652 F05
Figure 5. A Three-Resistor Feedback Network Can
Ease Component Selection
Using a resistor divider with an equivalent input resistance
at the VFB pin of 250k compensates for input bias current
error. Required resistor values to program desired VBAT(FLT)
follow the equations:
RFB1 = (VBAT(FLT) 2.5 105) / 3.3
(Ω)
RFB2 = (R1 (2.5 105)) / (R1- (2.5 105))
(Ω)
The charge function operates to achieve the final float
voltage of 3.3V on the VFB pin. The auto-restart feature
initiates a new charging cycle when the voltage at the VFB
pin falls 2.5% below that float voltage.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3652HVEDD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Power Tracking 2A Battery Charger |
| LT3652HVEMSE#PBF | 功能描述:IC BATTERY CHARGER 2A 12-MSOP 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，電量檢測計/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 |
| LT3652HVEMSE#PBF | 制造商:Linear Technology 功能描述:BATTERY CHARGER IC LEAD ACID LI-ION L 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, LITHIUM, 2A, MSOP12 |
| LT3652HVEMSE#TRPBF | 功能描述:IC BATTERY CHARGER 2A 12-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| LT3652HVEMSE-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Power Tracking 2A Battery Charger |
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