参数资料
| 型号： | LTC4101EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/30页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR BATT CHRG 24-SSOP |
| 标准包装： | 59 |
| 功能： | 充电管理 |
| 电池化学： | 智能电池 |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
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LTC4101
APPLICATIONS INFORMATION
Table 8. Recommended Resistor Values
Adapter
Rating (A)
1.5
1.8
2.0
2.3
2.5
2.7
3.0
3.3
3.6
4.0
–7% Adapter
Rating (A)
1.40
1.67
1.86
2.14
2.33
2.51
2.79
3.07
3.35
3.72
R CL Value*
( Ω )1%
0.068
0.062
0.051
0.047
0.043
0.039
0.036
0.033
0.030
0.027
R CL
Limit (A)
1.47
1.61
1.96
2.13
2.33
2.56
2.79
3.07
3.35
3.72
R CL Power
Dissipation (W)
0.15
0.16
0.20
0.21
0.23
0.26
0.28
0.31
0.33
0.37
R CL Power
Rating(W)
0.25
0.25
0.25
0.25
0.50
0.50
0.50
0.50
0.50
0.50
* Rounded to nearest 5% standard step value. Many non standard values are popular.
V OUT ? 1 ? OUT ?
Δ I L =
Charge Termination Issues
Batteries with constant current charging and voltage-based
charger termination might experience problems with re-
ductions of charger current caused by adapter limiting. It
is recommended that input limiting feature be defeated in
such cases. Consult the battery manufacturer for informa-
tion on how your battery terminates charging.
Setting Output Current Limit (Refer to Figure 1)
The LTC4101 current DAC and the PWM analog circuitry
must coordinate the setting of the charger current. Failure
to do so will result in incorrect charge currents.
Inductor Selection
Higher operating frequencies allow the use of smaller
inductor and capacitor values. A higher frequency gener-
ally results in lower ef?ciency because of MOSFET gate
charge losses. In addition, the effect of inductor value
on ripple current and low current operation must also be
considered. The inductor ripple current Δ I L decreases with
higher frequency and increases with higher V IN .
1 ? V ?
( f ) ( L ) ? V IN ?
Accepting larger values of Δ I L allows the use of low
Table 9. Recommended Resistor Values
I MAX (A) R SENSE ( Ω ) 1% R SENSE (W)
1.023 0.100 0.25
2.046 0.05 0.25
3.068 0.025 0.5
R ILIM ( Ω ) 1%
0
10k
33k
inductances, but results in higher output voltage ripple
and greater core losses. A reasonable starting point for
setting ripple current is Δ I L = 0.4(I MAX ). Remember the
maximum Δ I L occurs at the maximum input voltage. The
inductor value also has an effect on low current operation.
The transition to low current operation begins when the
4.092
Warning
0.025
0.5
Open
inductor current reaches zero while the bottom MOSFET
is on. Lower inductor values (higher Δ I L ) will cause this
to occur at higher load currents, which can cause a dip in
DO NOT CHANGE THE VALUE OF R ILIM DURING OPERA-
ef?ciency in the upper range of low current operation.
TION. The value must remain ?xed and track the R SENSE
value at all times. Changing the current setting can result
in currents that greatly exceed the requested value and
potentially damage the battery or overload the wall adapter
if no input current limiting is provided.
4101fa
22
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