SC806 Datasheet, PDF (1/13 Pages) Semtech Corporation – Miniature High Current Lithium-Ion Battery Charger

POWER MANAGEMENT
Description
The SC806 is a fully integrated, single cell, constant-cur-
rent (cc)/constant-voltage (cv) Lithium-Ion battery charger
in a tiny 3x3 mm thermally enhanced MLP package. The
SC806 can operate as a stand-alone charger or in con-
junction with a Power Management Controller (PMIC).
The SC806 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
SC806 switches to CV regulation mode. In this mode
the output current decays until the termination current is
reached. At this point the SC806 signals the charge cycle
is complete and turns off the output and enters the moni-
tor mode. If the battery voltage drops by 100mV from
the CV voltage a new charge cycle will begin.
The SC806 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.
Typical Application Circuit
SC806
Miniature High Current
Lithium-Ion Battery Charger
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 and termina-
tion current
‹ Battery voltage controlled to 1% accuracy
‹ Battery Charge Current accurate to 5% at 800mA
‹ Soft-start for step load and adapter plug-in
‹ Up to 1A continuous charge current
‹ Input voltage range from 3V to 6V allows seamless
charging from current limited adapter
‹ 0.1µA battery drain current in shutdown and
monitor modes
‹ Over current protection in all charging modes
‹ Automatic loss of battery detection
‹ Adapter Present, Charge Status, and No Battery
output LED drivers
*Patent Pending
Applications
‹ Cellular phones
‹ PDAs
‹ Handheld meters
‹ Charging stations
‹ USB chargers
‹ Digital cameras
‹ GPS Handhelds
‹ Programmable current source
CHARGER VIN
SC806 Typical Application Circuit
C1
.1uF
D2
LED
R2
1k
Charging
Indicator
SC806
D1
3
10
2
8
7
VCC
VOUT
CHRGB NTC
CPB
ITERM
NOBAT IPRGM
DIS
GND
1
9
5
4
6
LED
R1
1k
Adapter
Present
Indicator
NOBAT Indicator
NTC Voltage
R4
3.01k
R3
3.01k
BATTERY
C2
2.2uF
August 10, 2005
1
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