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参数资料
| 型号： | LT3652HVIMSE#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PDSO12 |
| 封装： | LEAD FREE, PLASTIC, MSOP-12 |
| 文件页数： | 6/24页 |
| 文件大小： | 250K |
| 代理商： | LT3652HVIMSE#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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3652HVIMSE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power Tracking 2A Battery Charger |
| LT3652IDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power Tracking 2A Battery Charger for Solar Power |
| LT3652IDD#PBF | 功能描述:IC BATTERY CHARGER 2A 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT3652IDD#TRPBF | 功能描述:IC BATTERY CHARGER 2A 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT3652IDDPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power Tracking 2A Battery Charger for Solar Power |
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