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| 型号： | LTC4054ES5-4.2#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT; Package: SOT; No of Pins: 5; Temperature Range: -40°C to +125°C |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | LEAD FREE, PLASTIC, TSOT-23, 5 PIN |
| 文件页数： | 4/16页 |
| 文件大小： | 185K |
| 代理商： | LTC4054ES5-4.2#TRPBF |
12
LTC4054-4.2/LTC4054X-4.2
405442xf
APPLICATIO S I FOR ATIO
WU
UU
Solving for IBAT using the quadratic formula2.
I
VV
RC
T
R
BAT
S
BAT
S
BAT
CC
A
JA
CC
=
°
(–
) –
(–
)
(–
)
2 4
120
2
θ
Using RCC = 0.25, VS = 5V, VBAT = 3.75V, TA = 25°C and
θJA = 125°C/W we can calculate the thermally regulated
charge current to be:
IBAT = 708.4mA
While this application delivers more energy to the battery
and reduces charge time in thermal mode, it may actually
lengthen charge time in voltage mode if VCC becomes low
RCC ()
0
CHARGE
CURRENT
(mA)
1000
800
600
400
200
0
0.5
1.0
1.25
405442 F04
0.25
0.75
1.5
1.75
CONSTANT
CURRENT
VBAT = 3.75V
TA = 25°C
θJA = 125°C/W
RPROG = 1.25k
THERMAL
MODE
DROPOUT
VS = 5.25V
VS = 5.5V
VS = 5V
Figure 4. Charge Current vs RCC
enough to put the LTC4054 into dropout. Figure 4 shows
how this circuit can result in dropout as RCC becomes
large.
This technique works best when RCC values are minimized
to keep component size small and avoid dropout. Remem-
ber to choose a resistor with adequate power handling
capability.
VCC Bypass Capacitor
Many types of capacitors can be used for input bypassing,
however, caution must be exercised when using multi-
layer ceramic capacitors. Because of the self-resonant and
high Q characteristics of some types of ceramic capaci-
tors, high voltage transients can be generated under some
start-up conditions, such as connecting the charger input
to a live power source. Adding a 1.5
resistor in series
with an X5R ceramic capacitor will minimize start-up
voltage transients. For more information, refer to Applica-
tion Note 88.
Charge Current Soft-Start
The LTC4054 includes a soft-start circuit to minimize the
inrush current at the start of a charge cycle. When a charge
cycle is initiated, the charge current ramps from zero to the
full-scale current over a period of approximately 100
s.
This has the effect of minimizing the transient current load
on the power supply during start-up.
Note 2: Large values of RCC will result in no solution for IBAT. This indicates that the LTC4054
will not generate enough heat to require thermal regulation.
Figure 3. A Circuit to Maximize Thermal Mode Charge Current
VCC
RPROG
RCC
Li-Ion
CELL
405442 F03
LTC4054-4.2
1
F
VS
BAT
PROG
GND
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4054XES5-4.2#TRMPBF | Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT; Package: SOT; No of Pins: 5; Temperature Range: -40°C to +125°C |
| LTC4054LES5-4.2#TRMPBF | Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT; Package: SOT; No of Pins: 5; Temperature Range: -40°C to +125°C |
| LTC4055EUF#PBF | USB Power Controller and Li-Ion Linear Charger; Package: QFN; No of Pins: 16; Temperature Range: -40°C to +125°C |
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| LTF5022T-3R3N2R5-LC | 1 ELEMENT, 3.3 uH, FERRITE-CORE, GENERAL PURPOSE INDUCTOR, SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4054L | 制造商:LINER 制造商全称:Linear Technology 功能描述:150mA Standalone Linear Li-Ion Battery Charger in ThinSOT |
| LTC4054L-4.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:150mA Standalone Linear Li-Ion Battery Charger in ThinSOT |
| LTC4054LES5-4.2 | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion 10mA to 150mA 4.2V 5-Pin TSOT-23 |
| LTC4054LES5-4.2#PBF | 制造商:Linear Technology 功能描述:Bulk 制造商:Linear Technology 功能描述:CHARGER BATTERY LI-ION 0.8A 5SOT23 制造商:Linear Technology 功能描述:CHARGER, BATTERY, LI-ION, 0.8A, 5SOT23 |
| LTC4054LES5-4.2#TR | 功能描述:IC CHARGR BATTERY L-ION TSOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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