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PDF SC805 Data sheet ( Hoja de datos )
| Número de pieza | SC805 | |
| Descripción | Miniature Integrated High Current Lithium-Ion Battery Charger | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC805 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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SC805
Miniature Integrated High Current
Lithium-Ion Battery Charger
POWER MANAGEMENT
Description
Features
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.
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
The SC805 also provides battery detection, and a bat-
tery NTC thermistor interface to disable charging when
*Patent Pending
the battery temperature exceeds safe-to-charge limits. Applications
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.
Typical Application Circuit
Cellular phones
PDA’s
Handheld meters
Charging stations
USB chargers
Digital cameras
Programmable current source
CHARGER VIN
SC805 typical Application Circuit
SC805
C1
1uF
D1
LED
R2
3.01k
1
2
7
8
9
VCC
VOUT
VCCIL CHRGB
EN/NTC ITERM
NOBAT IPRGM
RTIME GND
3
10
5
4
6
Adapter
Present
Indicator
R1
3.01k
RT1
Thermistor
t
R3
3.01k
R4
3.01k
R5
3.01k
Charge
Complete
Indicator
D2
LED
R6
1k
D3
LED
R7
1k
BATTERY
C1
2.2uF
Charging
Indicator
August 22, 2005
1 www.semtech.com
1 page  
www.DataSheet4U.com
POWER MANAGEMENT
Block Diagram
GND
6
NOBAT
8
Reference
Voltages
Vout Ref
Fast Charge Ref
Pre-Charge Ref
Control
Pre-Charge On
Fast-Charge On
Over Temp
Under Voltage
Over Voltage
EN/NTC
7
RTIME
9
CHRGB
10
NTC
Interface
Timer
VOUT
Vout Ref
VCC
1
Fast Charge Ref
Pre-Charge Ref
SC805
VCCIL
2
VOUT
3
IPRGM
4
ITERM
5
2005 Semtech Corp.
5
www.semtech.com
5 Page 
www.DataSheet4U.com
POWER MANAGEMENT
Typical Characteristics
B a tte ry C h a rg e P ro file
4 .4
4 .2
4
3 .8
3 .6
3 .4
3 .2
3
SC805
0 .6
0 .5
0 .4
0 .3
0 .2
0 .1
0
VCHRGB voltage not to
scale, shown to indicate
timing.
V CHARGE
T IM E
V CHRGB
Fast Charge Current -vs- Rprgm Value
900
800
700
FastC harge C urrent
600
500
400
300
200
100
0
90
80
70
60
50
40
30
20
10
0
I CHARGE
Pre-Charge/Termination Current -vs- Rterm
Pre-Charge Current
Rpgrm Value (ohms)
Charge Tim er -vs- Rtim e
9
8
7 Pre-C harge Tim e-out
6 Fast-C harge Tim eout
5
4
3
2
1
0
Rtim e (ohm s)
2005 Semtech Corp.
140 0.25
120
0.2
100
80 0.15
60 0.1
40
20 0.05
00
11
Rterm Value (ohms)
Drop-out Voltage f(Iout)
V drop
R out
100 250 500
Output Current (mA)
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
www.semtech.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SC805.PDF ] | |
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