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参数资料
| 型号： | LTC4098EUDC#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 2650 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 20/32页 |
| 文件大小： | 443K |
| 代理商： | LTC4098EUDC#PBF |
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LTC4098/LTC4098-1
27
40981fc
APPLICATIONS INFORMATION
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 1Ω of series resistance.
Furthermore, a 100μF MLCC in series with a 0.3
Ω resistor
or a 100μF OS-CON capacitor from BAT to GND is required
to prevent oscillation when the battery is disconnected.
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, CPROG, the fol-
lowing equation should be used to calculate the maximum
resistance value for RPROG:
RPROG ≤
1
2
π 100kHz CPROG
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| LTC4099 | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Controlled USB Power Manager/Charger with Overvoltage Protection |
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