参数资料
| 型号： | SC810ULTRT |
| 厂商： | Semtech |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGEMENT |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC810ULDKR |
SC810
Applications Information
Charger Operation
The SC810 is a single cell Li-ion battery charger. It imple-
ments a Constant Current (CC), Constant Voltage (CV)
charging algorithm with Thermal Limiting (TL).
When a valid input supply is first detected, a charge cycle
is initiated and the STATB open-drain output goes low. If
the battery voltage is less than the pre-charge threshold
voltage, the pre-charge current is supplied. Pre-charge
current is 20% of the programmed fast-charge current.
When the battery voltage exceeds the pre-charge thresh-
old, typically within seconds for a standard battery with a
starting cell voltage greater than 2V, the fast-charge CC
mode begins. The charge current soft-starts in three steps
(20%, 60%, and 100% of programmed fast-charge current)
to reduce adapter load transients. CC current is pro-
grammed by the IPRGM resistance to ground.
The charger begins CV regulation when the battery
voltage rises to the fully-charged single-cell Li-ion regula-
(UVLO) threshold will not be recognized until the ringing
has ceased. The UVLO rising threshold is set higher than
the voltage of a fully charged Li-ion single cell battery,
ensuring that only a charging source capable of fully
charging the battery has been applied. If the charging
current loads the adapter beyond its current limit, the
input voltage will be pulled down to just above the
battery voltage. This is referred to as Current-Limited-
Adapter (CLA) operation. The UVLO falling threshold is
set close to the battery voltage pre-charge threshold to
permit low-dissipation charging from a current limited
adapter.
Constant Current Mode Fast-charge Current
Programming
The CC mode is active when the battery voltage is above
VT PreQ and less than V CV . The programmed CC regulation
fast-charge (FQ) current is inversely proportional to the
resistance between IPRGM and GND according to the
equation
tion voltage (V CV ), nominally 4.2V. In CV regulation, the
output voltage is regulated, and as the battery charges,
the charge current gradually decreases. The STATB output
I FQ
V IPRGM _ Typ
R IPRGM
1000
goes high when I BAT drops below the termination thresh-
old current, which is 10% of the IPRGM pin programmed
fast-charge current. This is known as charge termination.
Optional Float-charging or Monitoring
Depending on the state of the ENB input, upon termina-
tion, the SC810 either operates indefinitely as a voltage
regulator (float-charging) or it turns off its output. If the
output is turned off upon termination, the device enters
the monitor state. In this state, the output remains off
until the BAT pin voltage decreases by the re-charge
threshold (VT ReQ = 100mV typically). A re-charge cycle
then begins automatically and the process repeats. A
forced re-charge cycle can also be periodically com-
manded by the processor to keep the battery topped-off
without float-charging. See the Monitor State section for
details. Re-charge cycles are not indicated by the STATB
pin.
Charging Input Pin Properties
The fast-charge current can be programmed for a
minimum of 70mA (R IPRGM = 29.4kΩ) and a maximum of
995mA (R IPRGM = 2.05kΩ), nominally.
Current regulation accuracy is dominated by gain error at
high current settings, and offset error at low current set-
tings. The range of expected fast-charge output current
versus programming resistance is shown in Figures 1a
and 1b. The figures show the nominal current versus
nominal R IPRGM resistance as the center plot and two theo-
retical limit plots indicating maximum and minimum
current versus nominal programming resistance. These
plots are derived from models of the expected worst-case
contribution of error sources depending on programmed
current. The current range includes the uncertainty due
to 1% tolerance resistors. The dots on each plot indicate
the currents obtained with the Electronic Industries
Association (EIA) E96 standard value 1% tolerance resis-
tors. Figures 1a and 1b show low and high resistance
ranges, respectively.
Glitch filtering is performed on the VIN pin, so an input
voltage that is ringing across its Under-Voltage Lockout
10
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| SC811ULTRT | 功能描述:IC BATTERY MANAGEMENT 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 |
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