SC801 Datasheet, PDF (1/17 Pages) Semtech Corporation – Fully Integrated High Currnet Lithium-Ion Battery Charger System

5+&
Fully Integrated High Current
Lithium-Ion Battery Charger System
POWER MANAGEMENT
Description
Features
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.
Typical Application Circuit
K Fully integrated charger with FET pass transistor,
reverse-blocking diode, sense resistor and thermal
protection
K 4.1V, 4.2V & Adjustable Output Voltage
K Programmable precharge, fastcharge & termination
current
K Battery voltage controlled to 1% accuracy
K Soft-start for step load and adaptor plug-in
K Up to 1.5A continuous charge current
K Charge current monitor output from microcontroller
or ADC Interface
K Input voltages range from 4.2V to 14V
K 0.1µA Battery leakage in shutdown and monitor
modes
K Operates without a battery in regulated LDO mode
K Small 4mm x 4mm 16 lead MLP package
K Low thermal impedance of 50°C/watt
K Few external components
K Over current protection in all charging modes
K Over voltage protection
K All outputs able to drive LED’s and interface to host
processor
K Remote Kelvin sensing at the battery terminal
K Small input & output filter capacitors
K Status output communicates charging and end of
charge cycle
K Now Available in Lead-Free Packaging
K Charges Li-Ion, Li-Polymer, NiCd and NiMH Batteries
Applications
K Cellular phones
K PDA’s and Handheld computers
K Handheld meters
K Charging stations
K Digital cameras
CHARGER VIN
C1
R1 R2
1uF
14
13
VC C
CP
11
10
3 ^VCC
STAT ₉
7
4
IPRGM OVP
EN
VPR GM
2
1
8
6
5
ITER M
BIP
GND
NC
BSEN
VOUT
VOUT
NC
16
15
12
SC 801
BATTER Y
FAU LT
C2
2.2uF
STATU S
C H AR GER
PR ESEN T
Pre
-
Charge
Current
=

2.8
R₂

•
88
Revision 3, April 2003
Fast
-
Charge
Current
=

1.5
R₁

•
1000
Termination
Current
=

1.5
R₂

•
88
1
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