- 您现在的位置：买卖IC网 > PDF目录1833 > LTC4012IUF-3#TRPBF (Linear Technology)IC CTLR BATT CHARGER CC/CV 20QFN PDF资料下载
参数资料
| 型号： | LTC4012IUF-3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/28页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BATT CHARGER CC/CV 20QFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页当前第22页第23页第24页第25页第26页第27页第28页
LTC4012-3
APPLICATIONS INFORMATION
20 ? Q G
C 1 = , C 2 = 20 ? C 1
R IN shouldnotbelessthan2.37kormorethan6.04k.Val-
ues of R IN greater than 3.01k may cause some reduction in
programmed current accuracy. Use these equations and
guidelines, as represented in Table 5, to help select the cor-
rect inductor value. This table was developed for C-grade
parts to maintain maximum ?I L near 0.6 ? I MAX with f PWM at
550kHz and V BAT = 0.5 ? V CLP (the point of maximum ?I L ),
assuming that inductor value could also vary by 25% at
I MAX . For I-grade parts, reduce maximum ?I L to less than
0.4 ? I MAX , but only if the IC will actually be used to charge
batteries over the wider I-grade temperature range. In that
case, a good starting point can be found by multiplying
the inductor values shown in Table 5 by a factor of 1.6 and
rounding up to the nearest standard value.
Table 5. Minimum Typical Inductor Values
L1
V CLP (Typ) I MAX R SENSE R IN R PROG
<10V ≥10μH 1A 100mΩ 3.01k 26.7k
10V to 20V ≥20μH 1A 100mΩ 3.01k 26.7k
>20V ≥28μH 1A 100mΩ 3.01k 26.7k
<10V ≥5.1μH 2A 50mΩ 3.01k 26.7k
10V to 20V ≥10μH 2A 50mΩ 3.01k 26.7k
>20V ≥14μH 2A 50mΩ 3.01k 26.7k
<10V ≥3.4μH 3A 33mΩ 3.01k 26.7k
TGATE BOOST Supply
Use the external components shown in Figure 11 to develop
a bootstrapped BOOST supply for the TGATE FET driver.
A good set of equations governing selection of the two
capacitors is:
4 . 5 V
where Q G is the rated gate charge of the top external NFET
with V GS = 4.5V. The maximum average diode current is
then given by:
I D = Q G ? 665kHz
To improve efficiency by increasing V GS applied to the
top FET, substitute a Schottky diode with low reverse
leakage for D1.
PWM jitter has been observed in some designs operating
at higher V IN /V OUT ratios. This jitter does not substantially
affect DC charge current accuracy. A series resistor with a
value of 5Ω to 20Ω can be inserted between the cathode
of D1 and the BOOST pin to remove this jitter, if present.
A resistor case size of 0603 or larger is recommended to
lower ESL and achieve the best results.
10V to 20V
≥6.8μH
3A
33mΩ
3.01k
26.7k
LTC4012-3
C1
INTV DD 17
C2
>20V ≥9.5μH 3A 33mΩ 3.01k 26.7k
<10V ≥2.5μH 4A 25mΩ 3.01k 26.7k
10V to 20V ≥5.1μH 4A 25mΩ 3.01k 26.7k
>20V ≥7.1μH 4A 25mΩ 3.01k 26.7k
To guarantee that a chosen inductor is optimized in any
given application, use the design equations provided and
perform bench evaluation in the target application, par-
ticularly at duty cycles below 20% or above 80% where
PWM frequency can be much less than the nominal value
of 550kHz.
BOOST 20
D1
1N4148
0.1μF
2μF
L1
SW 18
4012-3 F11
Figure 11. TGATE Boost Supply
TO
R SENSE
40123fb
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4050EMS-4.1#TR | IC BATT CHRG CNTRL LI-ION 10MSOP |
| LTC4052EMS8E-4.2#TRPBF | IC CHARGER PULSE LI-ION 8-MSOP |
| LTC4053EDD-4.2#TRPBF | IC CHARGER BATTERY USB 10-DFN |
| LTC4054ES5-4.2#TRMPBF | IC CHARGR BATTERY L-ION TSOT23-5 |
| LTC4055EUF-1#TRPBF | IC USB PWR MNGR BATT CHRGR 16QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4020EUHF#PBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020EUHF#TRPBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020IUHF#PBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020IUHF#TRPBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4050 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN |
发布紧急采购，3分钟左右您将得到回复。