© 2008 Semtech Corporation
POWER MANAGEMENT
1
SC811 / SC813
Adapter/USB Tri-Mode
Single-cell Li-ion Charger
Features
Single input charger with three charging modes
Constant voltage — 4.2V, 1% regulation
Fast-charge current regulation — 15% at 70mA,
9% at 700mA
Charging by current regulation, voltage regulation,
and thermal limiting
Input voltage protection — 30V
Current-limited adapter support capability — reduces
power dissipation in charger IC
USB high and low power modes limit charge current
to prevent USB Vbus overload
Instantaneous CC-to-CV transition for faster charging
Programmable battery-dependent currents (adapter
mode fast- and pre-charge, termination)
Programmable source-limited currents (USB-high
mode fast-charge, and USB-low mode fast- and
pre-charge)
Independent programming of termination current
with dual-mode operation
Three termination options — oat-charge, automatic
re-charge, or forced re-charge to keep the battery
topped-o after termination without oat-charging
Soft-start reduces adapter or USB load transients
High operating voltage range of SC811 permits use
of unregulated adapters
Complies with CCSA YD/T 1591-2006
Space saving 2x2x0.6 (mm) MLPD package
WEEE and RoHS compliant
Applications
Mobile phones
MP3 players
GPS handheld receivers
Description
The SC811 and SC813 are highly versatile single input
triple mode (adapter/USB high current, USB low current)
linear single-cell Li-ion battery chargers, each in an 8 lead
2x2 MLPD ultra-thin package. The input will survive sus-
tained input voltage up to 30V to protect against hot plug
overshoot and faulty charging adapters. The SC811 has
9.6V rising, 8.2V falling OVP thresholds for general purpose
charging with low cost adaptors. The SC813 has 6V rising,
5.6V falling OVP thresholds for customers utilizing charg-
ing adapters with speci cations that are similar to a USB
Vbus supply. The SC811 and SC813 differ only in OVP
threshold.
Charging begins automatically when an input source is
applied to the charging input. Thermal limiting protects
against excessive power dissipation. The charger can be
programmed to turn o when charging is complete or to
continue operating as an LDO regulator while oat-charg-
ing the battery.
Three charging modes are provided: adapter mode, USB
low power mode, and USB high power mode. Battery-
capacity-dependent and charging source-dependent
current programming are independently programmed.
Adapter and USB high power modes can charge up to 1A,
with the charging adapter operating either in voltage
regulation or in current limit to obtain the lowest possible
power dissipation. A single current programming pin is
used to program pre-charge, termination, and adapter-
mode fast-charge currents in fixed proportions. In the
USB modes, a second programming pin is used to program
low power pre-charge current and low and high power
fast-charge currents. This con guration allows indepen-
dent programming of termination current. The two USB
modes dynamically limit the charging load if necessary to
prevent overloading the USB Vbus supply.
Device
Load
Battery
Pack
2.2 μF
V
ADAPTER
2.2 μF
MODE SELECT
VIN
IPUSB
IPRGM
MODE
GND
STATB
ENB
BAT
SC811 / SC813
Typical Application Circuit
April 7, 2008
