参数资料
型号: LTC4098EUDC#PBF
厂商: Linear Technology
文件页数: 27/32页
文件大小: 0K
描述: IC CHARGER USB COMP 20-UTQFN
标准包装: 91
系列: Bat-Track™, PowerPath™
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: 20-WFQFN 裸露焊盘
供应商设备封装: 20-QFN-EP(3x4)
包装: 管件
LTC4098/LTC4098-1
APPLICATIONS INFORMATION
R PROG ≤
Battery Charger Stability Considerations
The LTC4098/LTC4098-1’s battery charger contains both a
constant-voltage and a constant-current control loop. The
constant-voltage loop is stable without any compensation
when a battery is connected with low impedance leads.
Excessive lead length, however, may add enough series
inductance to require a bypass capacitor of at least 1μF
from BAT to GND.
High value, low ESR multilayer ceramic chip capacitors
reduce the constant-voltage loop phase margin, possibly
resulting in instability. Ceramic capacitors up to 22μF may
be used in parallel with a battery, but larger ceramics should
be decoupled with 0.2 Ω to 1 Ω of series resistance.
Furthermore, a 100μF MLCC in series with a 0.3 Ω resistor
In constant-current mode, the PROG pin is in the feed-
back loop rather than the battery voltage. Because of the
additional pole created by any PROG pin capacitance,
capacitance on this pin must be kept to a minimum. With
no additional capacitance on the PROG pin, the charger
is stable with program resistor values as high as 25k.
However, additional capacitance on this node reduces the
maximum allowed program resistor. The pole frequency at
the PROG pin should be kept above 100kHz. Therefore, if
the PROG pin has a parasitic capacitance, C PROG , the fol-
lowing equation should be used to calculate the maximum
resistance value for R PROG :
1
2 π ? 100kHz ? C PROG
or a 100μF OS-CON capacitor from BAT to GND is required
to prevent oscillation when the battery is disconnected.
40981fc
27
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