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参数资料
| 型号： | LTC4098EUDC#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/32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) |
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LTC4098/LTC4098-1
OPERATION
MOSFET will be in full conduction. If additional conduc-
tance is needed, an external P-channel MOSFET transistor
may be added from BAT to V OUT . The IDGATE pin of the
LTC4098/LTC4098-1 drives the gate of the external P-chan-
nel MOSFET transistor for automatic ideal diode control.
The source of the external P-channel MOSFET should be
connected to V OUT and the drain should be connected to
BAT. Capable of driving a 1nF load, the IDGATE pin can
control an external P-channel MOSFET transistor having
an on-resistance of 30m Ω or lower. Figure 5 shows the
decreased forward voltage compared to a conventional
Schottky diode.
Suspend LDO
The LTC4098/LTC4098-1 provide a small amount of power
to V OUT in suspend mode by including an LDO from V BUS to
V OUT . This LDO will prevent the battery from running down
when the portable product has access to a suspended USB
port. Regulating at 4.6V, this LDO only becomes active when
the switching converter is disabled. In accordance with the
USB specification, the input to the LDO is current limited so
that it will not exceed the low power or high power suspend
specification. If the load on V OUT exceeds the suspend cur-
rent limit, the additional current will come from the battery
via the ideal diodes. The suspend LDO sends a scaled copy
of the V BUS current to the CLPROG pin, which will servo to
approximately 100mV in this mode. Thus, the high power
and low power suspend settings are related to the levels
programmed by the same resistor for 1x and 5x modes.
Battery Charger
The LTC4098/LTC4098-1 include a constant-current/con-
stant-voltage battery charger with automatic recharge,
automatic termination by safety timer, low voltage trickle
charging, bad cell detection and thermistor sensor input
for out-of-temperature charge pausing.
When a battery charge cycle begins, the battery charger
first determines if the battery is deeply discharged. If the
battery voltage is below V TRKL , typically 2.85V, an automatic
trickle charge feature sets the battery charge current to
10% of the programmed value. If the low voltage persists
for more than 1/2 hour, the battery charger automatically
2200
2000
1800
1600
1400
1200
1000
800
600
400
VISHAY Si2333
EXTERNAL
IDEAL DIODE
LTC4098/
LTC4098-1
IDEAL DIODE
ON
SEMICONDUCTOR
MBRM120LT3
terminates and indicates, via the CHRG pin, that the bat-
tery was unresponsive.
Once the battery voltage is above V TRKL , the charger begins
charging in full power constant-current mode. The current
delivered to the battery will try to reach 1030V/R PROG .
Depending on available input power and external load
conditions, the battery charger may or may not be able to
charge at the full programmed rate. The external load will
always be prioritized over the battery charge current. The
200
0
0
60
120 180 240 300 360 420 480
USB current limit programming will always be observed
and only additional power will be available to charge the
FORWARD VOLTAGE (mV) (BAT – V OUT )
40981 F05
battery. When system loads are light, battery charge cur-
rent will be maximized.
Figure 5. Ideal Diode V-I Characteristics
40981fc
17
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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 |
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