SC811 Datasheet, PDF (1/23 Pages) Semtech Corporation – Adapter/USB Tri-Mode Single-cell Li-ion Charger

SC811 / SC813
Adapter/USB Tri-Mode
Single-cell Li-ion Charger
POWER MANAGEMENT
Features
Description
„ 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
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 specifications that are similar to a USB
Vbus supply. The SC811 and SC813 differ only in OVP
threshold.
„ 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 — float-charge, automatic
re-charge, or forced re-charge to keep the battery
topped-off after termination without float-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
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 off when charging is complete or to
continue operating as an LDO regulator while float-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
Applications
USB modes, a second programming pin is used to program
„ Mobile phones
„ MP3 players
„ GPS handheld receivers
low power pre-charge current and low and high power
fast-charge currents. This configuration allows indepen-
dent programming of termination current. The two USB
modes dynamically limit the charging load if necessary to
Typical Application Circuit
prevent overloading the USB Vbus supply.
SC811 / SC813
V_ADAPTER
MODE SELECT
2.2 μF
VIN
MODE
STATB
GND
ENB
BAT
IPRGM
IPUSB
2.2 μF
Battery Device
Pack Load
April 7, 2008
© 2008 Semtech Corporation
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