LX2201
TM
廬
USB Li-Ion Battery Charger
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
The LX2201 Linear Battery Charger is a
multi-state (2 stage) Li-Ion battery charger
(Constant current / Constant voltage) that
can supply up to 2A of charging current into
a single cell Li-Ion battery.
LX2201 is a cost effective , high perfor-
mance USB battery charger. The LX2201
features a 2A high charge current, with
automatic power savings using isolated
battery topology, user programmability in
USB charging, and an extended battery life
with low Rds
ON
in discharge.
In USB mode, the LX2201 has
advantages over competition chargers with
the USB Limit Control circuit and low
Rds
ON
in discharge mode. The USB limit
Control circuit allows simultaneous battery
charging while the device is in operation.
The V
DD
to supply load is independent of
the V
BAT
charging logic. In discharge mode
a low Rds
ON
provides low loss and heavy
transient.
The LX2201 is a low cost, highly
integrated battery charger solution. . It only
requires three external resistors: one for
setting the constant charge current level, one
for setting the termination charge current,
and one for setting V
IN
. It also has a built
in thermostat that will throttle back the
charge current to keep the die temperature
from exceeding 150擄C; this feature insures
the LX2201 delivers the maximum charge
rate for a given thermal environment.
LX2201 support two types of Li-Ion
battery chemistry; 4.1V and 4.2V through
logical input (VM pin).. A high accuracy
current sensing circuit allows batteries to
be fully charged before terminating the
charge cycle.
The LX2201 design
enhances system battery life by avoiding
premature discharge of Li-Ion battery with
a separate battery terminal voltage from
system load when adaptor charging is used,
i.e. trickle charge.
The LX2201 provides a charging status
indicator. The integrated PMOS pass element
features low drop out voltage while providing
an inherent load disconnect with virtually no
drain on the battery when disabled or when
the input power is removed. Additionally a
battery load disconnect switch has been
integrated which provides seamless power
switching when transitioning between charge
and discharge modes.
The LX2201 features a pre-charge
conditioning mode for batteries that have
been deeply discharged and also has a top off
charge mode for batteries that are left on the
charger for extended periods.
The LX2201 is available in a high power
4mm x 4mm, 20-pin MLP, surface mount
package.
KEY FEATURES
2A Charge Current
USB Compliant Charging States
Low Rds
ON
in Discharge Mode
Power Saving and Conditional
Mode for Deep Discharge
Selectable Li-Ion Battery for 4.1V
or 4.2V Applications
Internal Pass Element Can
Function as a Reverse Direction
Load Switch
No Sense Resistor Required
Full Capacity Charging
True Charge Indicator
Wall Supply Regulator Tolerance
5V + 10%
Built In MOSFET Driver For Easy
AC Adapter/USB Implementation
Topping Charge with Voltage
Monitoring Mode
Inherent Load Disconnect
Small, High Power 20-lead MLP
package
APPLICATIONS
WWW .
Microsemi
.C
OM
Batteries with 350mAH to 2AH
Ratings
Cell Phones
PDAs
Charging Cradles
Digital Cameras
Low Cost Single Li-Ion Cell
Chargers
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
USB Lo / Hi
State Select Truth Table
VID0
VM
VID0
VID1
PSW
NC
VID1
0
1
0
To System
Regulator
VDD
BAT
0
0
1
VDD
BAT
VDD
AC/DC Adapter
VDD
LX2201
BAT
VDD > V
BAT
Switch open 鈥?charging
disabled.
Charging 鈥?USB high level if
using V
IN.
Charging 鈥?USB low level if
using V
IN.
Charging 鈥?USB high level if
using V
IN.
BAT
VIN
GND
CUS
CTP
CMP
CCP
USB POWER
1
1
V
BAT
> VDD
Switch open 鈥?discharge
disabled.
Switch open 鈥?discharge
disabled.
Battery Discharging. MOSFET
fully enhanced with current
flow V
BAT
to VDD.
Battery Discharging. MOSFET
fully enhanced with current
flow V
BAT
to VDD.
PACKAGE ORDER INFO
T
A
(擄C)
0 to 70
Copyright
漏
2000
Rev. 1.2b, 2005-04-13
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
STAT
LX2201
LX2201
LQ
Plastic MLP
4x4mm 20-Pin
LX2201CLQ
RoHS Complaint / Pb-free
Note: Available in Tape & Reel.
Append the letters 鈥淭R鈥?to the part number.
(i.e. LX2201CLQ-TR)
Microsemi
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