POWER MANAGEMENT
Description
Fully Integrated High Current
Lithium-Ion Battery Charger System
Features
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Fully integrated charger with FET pass transistor,
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reverse-blocking diode, sense resistor and thermal
protection
4.1V, 4.2V & Adjustable Output Voltage
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
or ADC Interface
Input voltages range from 4.2V to 14V
0.1µA Battery leakage in shutdown and monitor
modes
Operates without a battery in regulated LDO mode
Small 4mm x 4mm 16 lead MLP package
Low thermal impedance of 50°C/watt
°
Few external components
Over current protection in all charging modes
Over voltage protection
All outputs able to drive LEDs and interface to host
processor
Remote Kelvin sensing at the battery terminal
Small input & output filter capacitors
Status output communicates charging and end of
charge cycle
Now Available in Lead-Free Packaging
Charges Li-Ion, Li-Polymer, NiCd and NiMH Batteries
5+&
The SC801 is a fully integrated, single cell, constant-cur-
rent/constant-voltage Lithium-Ion\Li-Polymer battery
charger management system. The SC801 has built in in-
telligence and extreme functionality. When the battery
voltage is below 2.8V the charger operates in a pre-
charge mode with a 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
SC801 delivers up to 1.5A to the battery based on the
IPRGM pin resistor.
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-
tion to determine when to externally terminate the charge
cycle. Once the charge cycle is complete and terminates,
the device enters the charge monitor mode where the
output voltage of the battery is monitored. If this voltage
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.
The output voltage to the battery is controlled to within
1% of the programmed voltage for either 4.1V or 4.2V.
The SC801 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 using external termination.
Applications
Typical Application Circuit
C H AR G ER VIN
14
13
3
7
4
8
6
5
C1
1uF
R1
R2
Cellular phones
PDAs and Handheld computers
Handheld meters
Charging stations
Digital cameras
11
10
9
2
1
16
15
12
F A U LT
C2
2 . 2 uF
S TA TU S
VC C
CP
VC C
S TA T
IPR GM
OVP
EN
VPR GM
I TE R M
BSEN
BIP
VOU T
GN D
VOU T
NC
NC
S C 80 1
C H AR GER
PR ESEN T
B A TTE R Y
2.8
Pre - Charge Current
=
R
•
88
2
Revision 3, April 2003
1.5
1.5
Fast - Charge Current
= •
1000 Termination Current
=
R
R
•
88
1
2
1
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SEMTECH [ SEMTECH CORPORATION ]
