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参数资料
| 型号： | LTC4054XES5-4.2#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGR BATTERY L-ION TSOT23-5 |
| 标准包装： | 500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.25 V ~ 6.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC4054XES5-4.2 LTC4054XES5-4.2-ND |
LTC4054-4.2/LTC4054X-4.2
APPLICATIO S I FOR ATIO
V S
R CC
V CC
BAT
enough to put the LTC4054 into dropout. Figure 4 shows
how this circuit can result in dropout as R CC becomes
large.
This technique works best when R CC values are minimized
to keep component size small and avoid dropout. Remem-
1 μ F
LTC4054-4.2
PROG
GND
Li-Ion
CELL
ber to choose a resistor with adequate power handling
capability.
R PROG
V CC Bypass Capacitor
( V S BAT ) – ? ( V S BAT ) 2
?
?
?
θ JA
405442 F03
Figure 3. A Circuit to Maximize Thermal Mode Charge Current
Solving for I BAT using the quadratic formula 2 .
I BAT =
? 4R CC (120 ° C – T A ) ?
– V – V
2 R CC
Using R CC = 0.25 ? , V S = 5V, V BAT = 3.75V, T A = 25 ° C and
θ JA = 125 ° C/W we can calculate the thermally regulated
charge current to be:
I BAT = 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 V CC becomes low
1000
V S = 5V
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 μ s.
This has the effect of minimizing the transient current load
on the power supply during start-up.
CONSTANT
CURRENT
800
600
400 THERMAL
V S = 5.25V
V S = 5.5V
DROPOUT
MODE
200
0
V BAT = 3.75V
T A = 25 ° C
θ JA = 125 ° C/W
R PROG = 1.25k ?
0
0.25
0.5
0.75
1.0
1.25
1.5
1.75
R CC ( ? )
405442 F04
Figure 4. Charge Current vs R CC
Note 2: Large values of R CC will result in no solution for I BAT . This indicates that the LTC4054
will not generate enough heat to require thermal regulation.
405442xf
12
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