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TM ®
LX2201
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 performance 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 RdsON in discharge. In USB mode, the LX2201 has advantages over competition chargers with the USB Limit Control circuit and low RdsON in discharge mode. The USB limit Control circuit allows simultaneous battery charging while the device is in operation. The VDD to supply load is independent of the VBAT charging logic. In discharge mode a low RdsON 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 VIN . It also has a built in thermostat that will throttle back the charge current to keep the die temperature from exceeding 150°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 RdsON 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’s 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 > VBAT Switch open – charging disabled. Charging – USB high level if using VIN. Charging – USB low level if using VIN. Charging – USB high level if using VIN.
BAT
VIN
GND CUS CTP
CMP
CCP
USB POWER
1
1
VBAT > VDD Switch open – discharge disabled. Switch open – discharge disabled. Battery Discharging. MOSFET fully enhanced with current flow VBAT to VDD. Battery Discharging. MOSFET fully enhanced with current flow VBAT to VDD.
PACKAGE ORDER INFO
TA(°C) 0 to 70
Copyright © 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
LQ
Plastic MLP 4x4mm 20-Pin LX2201CLQ
RoHS Complaint / Pb-free
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX2201CLQ-TR)
Microsemi
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TM ®
LX2201
USB Li-Ion Battery Charger
P RODUCTION D ATA S HEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
WWW . Microsemi . C OM
Supply Voltage (VIN)..........................................................................-0.3V to 7V Analog Input Signals (VIDx, VM, SNS) .............................................-0.3V to 7V Battery Charging Current (IBAT).........................................................................2A Discharge Current (IVDD)....................................................................................3A Operating Junction Temperature....................................