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SC805IMLTRT 参数 Datasheet PDF下载

SC805IMLTRT图片预览
型号: SC805IMLTRT
PDF下载: 下载PDF文件 查看货源
内容描述: 微型集成高电流锂离子电池充电器 [Miniature Integrated High Current Lithium-Ion Battery Charger]
分类和应用: 电源电路电池电源管理电路光电二极管
文件页数/大小: 15 页 / 283 K
品牌: SEMTECH [ SEMTECH CORPORATION ]
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Miniature Integrated High Current
Lithium-Ion Battery Charger
POWER MANAGEMENT
Description
The SC805 is a fully integrated, single cell, constant-cur-
rent (CC)/constant-voltage (CV) Lithium-Ion battery
charger in a tiny 3x3 mm thermally enhanced lead free
MLP package. The SC805 can operate as a stand-alone
charger or in conjunction with a Power Management Con-
troller (PMIC).
The SC805 has a pre-charge function for trickle charging
deeply discharged batteries. The fast charge current is
enabled automatically when the battery voltage reaches
the required threshold. When the battery reaches the
constant voltage or CV portion of the charge curve the
SC805 switches to CV regulation mode. In this mode
the output current decays as the battery charges until
the termination current is reached and the SC805 sig-
nals the charge cycle is complete. The SC805 can be
configured to continue charging for a predetermined time
before turning off, or to turn off immediately upon termi-
nation. After turning off its output, The SC805 enters
monitor mode. If the battery voltage drops by 100mV
from the CV voltage a new charge cycle will begin. The
timer function also protects against charging faulty bat-
teries by turning off if the pre-charge time exceeds 1/4
of the total programmed charge duration.
The SC805 also provides battery detection, and a bat-
tery NTC thermistor interface to disable charging when
the battery temperature exceeds safe-to-charge limits.
The SC805 can also function as a general purpose cur-
rent source or as a current source for charging nickel-
cadmium (NiCd) and nickel-metal-hydride (NiMH) batter-
ies.
SC805
Features
Fully integrated charger with FET pass transistor,
reverse-blocking diode, sense resistor and thermal
protection
High Accuracy Charge Current*
Tiny 3mm x 3mm 10 lead MLP package
Programmable precharge, fastcharge & termination
current
Battery voltage controlled to 1% accuracy
Built in timer for protection and complete charging
NTC interface with battery detection
Soft-start for step load and adaptor plug-in
Up to 1A continuous charge current
Input voltage range from 3V to 6V allows seamless
charging from current limited adapter
Provides adapter voltage VCCIL to power external
accessories
Battery Present detection and output indicator
Operates in charger or LDO-mode without battery
0.1µA battery drain current in shutdown and
monitor modes
Over current protection in all charging modes
CHRGB output communicates charging and end of
charge cycle
*Patent Pending
Applications
Cellular phones
PDA’s
Handheld meters
Charging stations
USB chargers
Digital cameras
Programmable current source
Charge
Complete
Indicator
Typical Application Circuit
SC805
VCC
VOUT
VCCIL CHRGB
EN/NTC ITERM
NOBAT IPRGM
RTIME
GND
SC805 typical Application Circuit
CHARGER VIN
C1
1uF
D1
LED
R2
3.01k
1
2
7
8
9
3
10
5
4
6
R4
3.01k
D2
LED
R5
3.01k
D3
LED
BATTERY
C1
R6
1k
R7
1k
2.2uF
Adapter
Present
Indicator
R1
3.01k
RT1
Thermistor
R3
3.01k
t
Charging
Indicator
August 22, 2005
1
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