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| 型号： | SC804AMLTRT |
| 厂商： | Semtech Corporation |
| 英文描述： | Fully Integrated 4.4V Lithium-Ion Battery Charger System with Timer |
| 中文描述： | 完全集成的4.4V锂离子电池充电器系统的计时器 |
| 文件页数： | 21/21页 |
| 文件大小： | 550K |
| 代理商： | SC804AMLTRT |
9
2005 Semtech Corp.
www.semtech.com
SC804A
PRELIMINARY
POWER MANAGEMENT
DRAFT
in the event of a faulty battery and to maximize charging
capacity. The RTIM pin is connected to VCC to select the
internal timer, and to GND to disable the timer.
Connecting a resistor between RTIM and GND will program
the total charge time according to the following equation:
R
RTIM
1
Charge time =
(
————
)
× ———
3.08
3600
With charge time expressed in hours.
The timer is
programmable over the range of 2 to 6 hours. The internal
timer selection results in a charge time of 3 hours. The
SC804A will automatically turn off the output when the
charge timer times out.
NTC Interface
The NTC pin provides an interface to a battery pack
Negative Temperature Coefcient (NTC) thermistor. The
typical NTC network has a xed resistor from VCC to the
NTC pin, and the battery pack NTC thermistor connected
from the NTC pin to ground. In this conguration, an
increasing battery temperature produces a decreasing
NTC pin voltage, and a decreasing battery temperature
produces an increasing NTC pin voltage.
This conguration is shown in the typical application
schematic on page 1 of this datasheet. When the NTC
voltage from the divider is greater than the high (cold)
threshold or less than the low (hot) threshold, the SC804A
suspends the charge cycle by turning off the output, halting
(but not resetting) the charge timer, and indicating a fault
on the FLTB pin. Hysteresis is included for both high and
low NTC thresholds to avoid chatter at the NTC trip points.
When the NTC pin voltage returns to the valid range, the
SC804A automatically resumes the charge cycle. The
charge timer will time-out when the SC804A output on-
time exceeds the timer setting regardless of how long it
has been disabled due to the NTC temperature.
An input voltage between VT
NTCH×V
VCC and the CTO input
voltage V
CTO (VTNTCC×VVCC if CTO is tied to GND) enables
charging. An input voltage outside this range suspends
charging and drives FLTB pin active (low). The internal
NTC thresholds of VT
NTCH and VTNTCC were designed to
work with standard thermistors available from numerous
vendors.
NTC pin voltage below VT
NTCDIS (nominally 0.6V) disables
Applications Information (Cont.)
AFC voltage. (Note that AFC voltages above VIPRGM will
produce I
VOUT exceeding that programmed as per the Fast-
Charge Mode (CC) section.) For any applied AFC voltage,
FCI must not drop below 130mA, and FCI must always
remain at least 80mA greater than PCI.
Termination Current
Once the battery voltage reaches V
CV the SC804A will
transition from constant current mode to constant voltage
mode. The current through the battery will decrease while
the voltage remains constant as the battery becomes fully
charged. When the current falls below the programmed
termination current set by the termination resistor
connected to the ITERM pin, the SC804A will disable
CHRGB. If the timer is enabled the output will continue
to oat-charge in CV mode until the timer expires. If the
timer is disabled, the output will turn off as soon as the
termination current level is reached. The equation to set
the termination current is given by:
ITERM can be programmed to be as high as 300mA or as
low as 50mA, though accuracy is not guaranteed below
100mA. ITERM must be programmed to be less than FCI
for correct operation of the charge cycle.
Monitor Mode
When a charge cycle is complete, the SC804A output
turns off and the device enters monitor mode. If the
voltage of the battery falls below the recharge threshold
(V
CV - VReQ), the charger will clear the charge timer and
re-initiate a charge cycle. The maximum current drain of
the battery during monitor mode will be no more than 1
μA
over temperature. The status of the charger output as a
function of the timer and IOUT is tabulated below.
Charge Timer
The timer on the SC804A has two functions: to protect
Timer
Iout
Output State
T < Timeout
N/A
On
T > Timeout
N/A
Off
Disabled
< Itermination
Off
V
ITERM_Typ
ITERM =
× 100
R
ITERM
相关PDF资料 |
PDF描述 |
|---|---|
| SC804A | Fully Integrated 4.4V Lithium-Ion Battery Charger System with Timer |
| SC804EVB | Fully Integrated Lithium-Ion Battery Charger System with Timer |
| SC804IMLTRT | Fully Integrated Lithium-Ion Battery Charger System with Timer |
| SC804 | Fully Integrated Lithium-Ion Battery Charger System with Timer |
| SC805EVB | Miniature Integrated High Current Lithium-Ion Battery Charger |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SC804EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Fully Integrated 4.4V Lithium-Ion Battery Charger System with Timer |
| SC804IML.TRT | 功能描述:IC LI-ION BATTERY CHRGR 16MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 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 |
| SC804IMLTRT | 制造商:Semtech Corporation 功能描述:Battery Charger Li-Ion 1500mA 4.2V 16-Pin MLPQ EP T/R |
| SC805 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Miniature Integrated High Current Lithium-Ion Battery Charger |
| SC805A | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Miniature Integrated High Current Lithium-Ion Battery Charger |
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