参数资料
| 型号： | LTC4101EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 26/30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
The following equation shows the minimum C OUT (±20%
tolerance) capacitance values for stability when used with
the compensation shown in the typical application on the
back page.
C OUT(MIN) = 120/L1
The use of aluminum electrolytic for C1, located at the
AC adapter input terminal, is helpful in reducing ringing
during the hot-plug event. Refer to Application Note 88
for more information.
tive terminal makes contact to the connector before the
negative terminal, the SMBus inputs can be forced below
ground with the full battery potential, causing a potential
for latch-up in any of the devices connected to the SMBus
inputs. Therefore it is good design practice to protect the
SMBus inputs as shown in Figure 10.
V DD
In the 4A lithium battery charger (typical application on
back page), the input capacitor (C2) is assumed to absorb
all input switching ripple current in the converter, so it
must have adequate ripple current rating. Worst-case RMS
CONNECTOR
TO BATTERY
TO SYSTEM
ripple current will be equal to one half of output charging
current. C2 is recommended to be equal to or greater than
C4 (output capacitor) in capacitance value.
The output capacitor (C4) is also assumed to absorb
output switching current ripple. The general formula for
capacitor current is:
4101 F13
Figure 10. Recommended SMBus Transient Protection
SafetySignal (Thermistor) Value
The SafetySignal (typical application on back page), is a
multifunction signal that communicates three pieces of
0.29(V BAT ) ? 1– BAT ?
I RMS =
? V ?
? V DCIN ?
(L1)(f)
information in order of importance:
1) Presence of the smart battery
2) The maximum time duration of the wake-up charge
allowed.
For example, V DCIN = 12V, V BAT = 4.2V, L1 = 10μH, and
f = 300kHz, I RMS = 0.26A.
EMI considerations usually make it desirable to minimize
ripple current in the battery leads, and beads or induc-
tors may be added to increase battery impedance at the
300kHz switching frequency. Switching ripple current splits
between the battery and the output capacitor depending
on the ESR of the output capacitor and the battery imped-
ance. If the ESR of C3 is 0.2Ω and the battery impedance
is raised to 4Ω with a bead or inductor, only 5% of the
current ripple will ?ow in the battery.
Protecting SMBus Inputs
The SMBus inputs, SCL and SDA, are exposed to uncon-
trolled transient signals whenever a battery is connected
to the system. If the battery contains a static charge, the
SMBus inputs are subjected to transients which can cause
damage after repeated exposure. Also, if the battery’s posi-
3) An optional and redundant temperature measurement
system.
The value of the resistance to ground communicates all
this information. The resistance ranges and what it does
is covered by the SBS Smart Battery Charger standard in
Section 6. Basically if you have a battery chemistry, such
as Li-ion, that cannot safely withstand an in?nite dura-
tion wake-up charge, the SafetySignal resistance value
needs to be less than 425Ω. The popular value to use is
a ?xed 300Ω resistor. Otherwise the resistance value is
10k which is normally expected to be done using a 10k
NTC resistor.
PCB Layout Considerations
For maximum ef?ciency, the switch node rise and fall times
should be minimized. To prevent magnetic and electrical
?eld radiation and high frequency resonant problems,
proper layout of the components connected to the IC is
4101fa
26
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相关代理商/技术参数 |
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| LTC4110 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Battery Backup System Manager |
| LTC4110EUHF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Battery Backup System Manager |
| LTC4110EUHF#PBF | 功能描述:IC BATTERY BACKUP MANAGER 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC4110EUHF#PBF | 制造商:Linear Technology 功能描述:Battery Management IC |
| LTC4110EUHF#TRPBF | 功能描述:IC BATTERY BACKUP MANAGER 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
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