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PDF SC803 Data sheet ( Hoja de datos )
| Número de pieza | SC803 | |
| Descripción | Fully Integrated High Current Lithium-Ion Battery Charger System | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC803 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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SC803
Fully Integrated High Current
Lithium-Ion Battery Charger System
POWER MANAGEMENT
Description
Features
The SC803 is a fully integrated, single cell, constant-cur- Fully integrated charger with FET pass transistor,
rent constant-voltage Lithium-Ion battery charger man-
reverse-blocking diode, sense resistor and thermal
agement system. The SC803 has built in intelligence and
protection
extreme functionality. When the battery voltage is below Complete voltage ranges of 4.1V, 4.2V &
2.8V the charger operates in a pre-charge mode with a
adjustable
charging current of up to 125mA based on the ITERM
pin resistor. This pre-charge mode is set to limit power
dissipation due to an undercharged battery. When the
battery voltage exceeds 2.8V, the charger enters a fast
charge mode. In this mode, the SC803 delivers up to
1.5A to the battery based on the IPRGM pin resistor.
Programmable precharge, fastcharge & termination
current
Battery voltage controlled to 1% accuracy
Soft-start for step load and adaptor plug-in
Up to 1.5A continuous charge current
Charge current monitor output from microcontroller
The part also features current termination, ending the
charge cycle when the battery is charged and the charge
current drops below the current programmed by the
ITERM pin resistor. In addition, the charge current can
be monitored by the voltage on the IPRGM pin allowing a
microcontroller or ADC to access the current informa-
or ADC Interface
Input voltages range from 4.2V to 7V
0.1µA Battery drain current in shutdown and
monitor modes
Operates without a battery in regulated LDO mode
Small 4mm x 4mm 16 lead MLP package
tion to determine when to externally terminate the charge Low thermal impedance of 50°C/watt
cycle. Once the charge cycle is complete and terminates, Few external components
the device enters the charge monitor mode where the Over current protection in all charging modes
DataShee
output voltage of the battery is monitored. If this DvoalttaaSgheeet4U.cOovmer voltage protection with fault pin output
drops below the recharge threshold the device will enter
the fast charge mode again, to bring the battery to its
fully charged state. Both the shutdown and monitor
modes drain no more than 1uA from the battery guaran-
teed.
All outputs able to drive LED’s and interface to host
processor
Remote Kelvin sensing at the battery terminal
Small input & output filter capacitors
Status output communicates charging and end of
The output voltage to the battery is controlled to within
charge cycle
1% of the programmed voltage for either 4.1V or 4.2V. Applications
The SC803 can also function as a general purpose cur- Cellular phones
rent source or as a current source for charging nickel-
cadmium (NiCd) and nickel-metal-hydride (NiMH) batter-
ies using external termination.
PDA’s
Handheld meters
Charging stations
Handheld computers
Typical Application Circuit
Digital cameras
Programmable current source
CHARGER VIN
C1 R1 R2
1uF
14
13
3
7
4
8
6
5
VCC
CP
VCC
STAT
IPRGM OVP
EN VPRGM
ITERM BSEN
BIP VOUT
GND
VOUT
NC NC
11
10
9
2
1
16
15
12
SC803
BATTERY
DataSheet4U.com
Pre−Charge
Current
=
2.8
R2
•
88
Revision 4, November 2004
Fast
−
Charge
Current
=
1.5
R1
•
1000
1
DataSheet4 U .com
FAULT
STATUS
CHARGER
PRESENT
C2
2.2uF
Termination
Current
=
1.5
R2
•
88
www.semtech.com
1 page  
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POWER MANAGEMENT
Block Diagram
SC803
VCC
13,14
EN 7
OVP 9
GND 6
et4U.com
STAT 10
CP 11
BIP 8
BSEN 1
VPRGM 2
EN
Control
1.2V
Reference
and OT SD
EN
Status
UV
OV
+ 1.2V
- 4.2V
4.1V
3.0V
Vout
Fast Charge
Enable
Charge
Pump
-
+
Vprog
Detect
4.2V
4.1V
3.0V
DataSheet4U.c1o.2Vm
V_FB -
+
+
-
- Termination
1.2V +
100 1
100 0.1
15,16 VOUT
DataShee
4
ITERM
3
IPRGM
DataSheet4U.com
2004 Semtech Corp.
DataSheet 4 U .com
5
www.semtech.com
5 Page 
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POWER MANAGEMENT
LDO Mode Timing Diagram
et4U.com
LDO Mode
Vcc
5V
4.2V
6.5V
6.3V
BIP Low
Vout
Iout
1ms 1ms
4ms
4.2V
ILIMIT
1ms 1ms 4ms
Precharge
Limit
Soft Start
1ms
CP
OVP
Stat
High Z
DataSheet4U.com
EN
ILIMIT
SC803
DataShee
DataSheet4U.com
2004 Semtech Corp.
DataSheet4 U .com
11
www.semtech.com
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet SC803.PDF ] | |
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