参数资料
| 型号： | SC824ULTRT |
| 厂商： | Semtech |
| 文件页数： | 1/29页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGEMENT |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC824ULDKR |
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SC824
Single-cell Li-Ion Charger
Tri-Mode with Timer and NTC
POWER MANAGEMENT
Features
Single input 30V protected charger
Adapter, USB High, USB Low modes
Charging by current regulation, voltage regulation,
and thermal limiting
Programmable currents from 70mA to 1A
Fast-charge current regulation — 15% at 70mA,
9% at 700mA
Constant voltage — 4.2V, 1% regulation
Input voltage protection — 30V
Current-limited adapter support capability — reduces
power dissipation in charger IC
USB modes automatically reduce charge current if
needed to prevent USB Vbus overload
Instantaneous CC-to-CV transition for faster charging
Battery temperature NTC thermistor interface
Multi-stage charge timer for safety and alternative
termination, IEEE Std. 1725-2006 compliant
Termination on current or timer — first to occur
Soft-start reduces adapter or USB load transients
High operating voltage range permits use of
unregulated adapters
Complies with CCSA YD/T 1591-2006
High-current USB Dedicated Charger compatible
Ultra-thin 2×2×0.6 (mm) MLPD package
Lead-free and halogen-free
WEEE and RoHS compliant
Applications
Mobile phones
Personal Media Players
Personal Navigation Devices
Typical Application Circuit
Description
The SC824 is a single input triple mode (adapter/USB High,
USB Low) linear single-cell Li-Ion battery charger in a 10
lead 2×2 (mm) MLPD ultra-thin package.
Charging begins automatically when an input source is
applied to the charging input. The input is designed to
survive sustained input voltage up to 30V to protect
against hot plug overshoot and faulty charging adapters.
Thermal limiting protects the SC824 from excessive power
dissipation.
The SC824 provides three modes of charging: adapter
mode, USB low power mode, and USB high power mode.
Adapter mode charges up to 1A with the charging adapter
operating either in voltage regulation or in current limit to
obtain the lowest possible power dissipation. A single
current programming pin is used to program precharge
current, termination current, and fast-charge current in
fixed proportions. The USB modes provide low and high
power fast-charge currents. The two USB modes dynami-
cally limit the charging load if necessary to automatically
prevent overloading the USB Vbus supply.
The SC824 provides a battery NTC thermistor interface to
disable charging when the battery temperature exceeds
programmed thresholds. An optional programmable
multi-stage charge timer protects against a faulty battery,
or terminates charging on timeout if the system load is
too great to terminate charging on current. A 45 minute
top-off period following termination ensures a fully
charged battery. The monitor state restarts a charge cycle
if the battery discharges after the charger has turned off.
SC824
R NPU
V ADAPTER
VIN
EN_NTC
MODE SELECT
CPU GPIO
2.2 μ F
1 μ F
VSYS
MODE
RTIME
BAT
IPRGM
STAT0
R IPRGM
2.2 μ F
R NTC
Thermistor
Device
Load
GND
STAT1
Battery
Pack
October 30, 2009
? 2009 Semtech Corporation
1
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