- 您现在的位置：买卖IC网 > PDF目录1834 > LTC4098EUDC#TRPBF (Linear Technology)IC CHARGER USB COMP 20-UTQFN PDF资料下载
参数资料
| 型号： | LTC4098EUDC#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER USB COMP 20-UTQFN |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
LTC4098/LTC4098-1
OPERATION
To make the CHRG pin easily recognized by both humans
and microprocessors, the pin is either a DC signal of ON
for charging, OFF for not charging or it is switched at high
frequency (35kHz) to indicate the two possible faults. While
switching at 35kHz, its duty cycle is modulated at a slow
rate that can be recognized by a human.
When charging begins, CHRG is pulled low and remains
low for the duration of a normal charge cycle. When charge
current drops to 1/10th the value programmed by R PROG ,
the CHRG pin is released (Hi-Z). The CHRG pin does not
respond to the C/10 threshold if the LTC4098/LTC4098-1
are in V BUS current limit. This prevents false end-of-charge
indications due to insufficient power available to the battery
charger. If a fault occurs while charging, the pin is switched
at 35kHz. While switching, its duty cycle is modulated
between a high and low value at a very low frequency. The
low and high duty cycles are disparate enough to make
an LED appear to be on or off thus giving the appearance
of “blinking”. Each of the two faults has its own unique
“blink” rate for human recognition as well as two unique
duty cycles for machine recognition.
Table 2 illustrates the four possible states of the CHRG
pin when the battery charger is active.
Table 2. CHRG Signal
Notice that an NTC fault is represented by a 35kHz pulse
train whose duty cycle toggles between 6.25% and 93.75%
at a 1.5Hz rate. A human will easily recognize the 1.5Hz
rate as a “slow” blinking which indicates the out of range
battery temperature while a microprocessor will be able
to decode either the 6.25% or 93.75% duty cycles as an
NTC fault.
If a battery is found to be unresponsive to charging (i.e.,
its voltage remains below 2.85V for 1/2 hour), the CHRG
pin gives the battery fault indication. For this fault, a human
would easily recognize the frantic 6.1Hz “fast” blink of the
LED while a microprocessor would be able to decode either
the 12.5% or 87.5% duty cycles as a bad cell fault.
Because the LTC4098/LTC4098-1 are 3-terminal PowerPath
products, system load is always prioritized over battery
charging. Due to excessive system load, there may not be
sufficient power to charge the battery beyond the bad-cell
threshold voltage within the bad-cell timeout period. In
this case the battery charger will falsely indicate a bad cell.
System software may then reduce the load and reset the
battery charger to try again.
Although very improbable, it is possible that a duty cycle
reading could be taken at the bright-dim transition (low
duty cycle to high duty cycle). When this happens the
MODULATION
DUTY
duty cycle reading will be precisely 50%. If the duty cycle
STATUS
Charging
I BAT < C/10
NTC Fault
Bad Battery
FREQUENCY
0Hz
0Hz
35kHz
35kHz
(BLINK) FREQUENCY
0Hz (Low Z)
0Hz (Hi-Z)
1.5Hz at 50%
6.1Hz at 50%
CYCLES
100%
0%
6.25% or 93.75%
12.5% or 87.5%
reading is 50%, system software should disqualify it and
take a new duty cycle reading.
40981fc
19
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4099EUDC#PBF | IC USB PWR MANAGER/CHRGR 20-QFN |
| LTC4100EG#TR | IC CHARGER SMART BATTERY 24-SSOP |
| LTC4101EG#PBF | IC CNTRLR BATT CHRG 24-SSOP |
| LTC4110EUHF#TRPBF | IC BATTERY BACKUP MANAGER 38-QFN |
| LTC4150IMS#TRPBF | IC COUNTER/GAUGE GAS/BATT 10MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LTC4099EPDC#PBF | 功能描述:IC USB PWR MANAGER/CHRGR 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LTC4099EPDC#TRMPBF | 制造商:Linear Technology 功能描述: |
| LTC4099EPDC#TRPBF | 功能描述:IC USB PWR MANAGER/CHRGR 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LTC4099EPDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Controlled USB Power Manager/Charger with Overvoltage Protection |
发布紧急采购，3分钟左右您将得到回复。