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参数资料
| 型号： | LTC4065LXEDC#TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | 2 X 2 MM, 0.75 MM HEIGHT, EXPOSED PAD, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件页数： | 4/16页 |
| 文件大小： | 168K |
| 代理商： | LTC4065LXEDC#TRM |
12
LTC4065L/LTC4065LX
4065lxfa
Undervoltage Charge Current Limiting (UVCL)
The LTC4065L includes undervoltage charge (
VUVCL1)
current limiting that prevents full charge current until the
input supply voltage reaches approximately 200mV above
the battery voltage. This feature is particularly useful if the
LTC4065L is powered from a supply with long leads (or
any relatively high output impedance).
For example, USB-powered systems tend to have highly
variable source impedances (due primarily to cable quality
and length). A transient load combined with such imped-
ance can easily trip the UVLO threshold and turn the
charger off unless undervoltage charge current limiting is
implemented.
Consider a situation where the LTC4065L is operating
under normal conditions and the input supply voltage
begins to droop (e.g., an external load drags the input
supply down). If the input voltage reaches VBAT + VUVCL1
(approximately 220mV above the battery voltage),
undervoltage charge current limiting will begin to reduce
the charge current in an attempt to maintain
VUVCL1
between the VCC input and the BAT output of the IC. The
LTC4065L will continue to operate at the reduced charge
current until the input supply voltage is increased or
voltage mode reduces the charge current further.
USB and Wall Adapter Power
Although the LTC4065L allows charging from a USB port,
a wall adapter can also be used to charge Li-Ion batteries.
Figure 3 shows an example of how to combine wall adapter
and USB power inputs. A P-channel MOSFET, MP1, is
used to prevent back conducting into the USB port when
a wall adapter is present and Schottky diode, D1, is used
to prevent USB power loss through the 1k pull-down
resistor.
Stability Considerations
The LTC4065L contains two control loops: constant-
voltage and constant-current. 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 1
F from BAT to
GND. Furthermore, a 4.7
F capacitor with a 0.2 to 1
series resistor from BAT to GND is required to keep ripple
voltage low when the battery is disconnected.
High value capacitors with very low ESR (especially ce-
ramic) may reduce the constant-voltage loop phase mar-
gin. Ceramic capacitors up to 22
F may be used in parallel
with a battery, but larger ceramics should be decoupled
with 0.2
to 1 of series resistance.
Figure 3. Combining Wall Adapter and USB Power
APPLICATIO S I FOR ATIO
WU
UU
VCC
MP1
1k
800
3
IBAT
4
6
Li-Ion
BATTERY
SYSTEM
LOAD
4065L F03
LTC4065L
BAT
USB
POWER
5V WALL
ADAPTER
PROG
+
D1
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相关代理商/技术参数 |
参数描述 |
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| LTC4066 | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB Power Controller and Li-Ion Linear Charger with Low Loss Ideal Diode |
| LTC4066-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB Power Controller and Li-Ion Linear Charger with Low Loss Ideal Diode |
| LTC4066EPF#PBF | 功能描述:IC USB POWER MANAGER 24-UTQFN RoHS:是 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 |
| LTC4066EPF#TRPBF | 功能描述:IC USB POWER MANAGER 24-UTQFN RoHS:是 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 |
| LTC4066EUF#PBF | 功能描述:IC USB POWER MANAGER 24-QFN RoHS:是 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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