LX2202 Datasheet, PDF (1/12 Pages) Microsemi Corporation – 2A Li-Ion Linear Charger and Power Control

LX2202
TM
® _{2A Li-Ion Linear Charger and Power Control}
PRODUCTION DATA SHEET
DESCRIPTION
The LX2202 Linear Battery Charger is a
multi-state (2 stage) Li-Ion battery charger
(Constant current / Constant voltage) that is
designed to minimize battery charge time
(even from current limited sources such as
USB) and provide a simplified interface to
control battery discharge.
LX2202 features up to 2A charging
current from an AC adapter and an isolated
battery topology to minimize charge time
from current limited sources such as USB.
A thermal control loop maintains a safe
operating temperature at all times.
The LX2202 provides a seamless
complete battery interface. When the input
power source is removed, the LX2202
provides the discharge path for the battery
with extremely low discharge impedance.
This eliminates the need for external
discharge switch and voltage supervisors.
In USB mode, the LX2202 provides
three levels of current limit: 100mA,
500mA, and off.
The LX2202 (compared to the LX2201)
has improved charge and discharge mode
detection circuitry. A UVLO feature prevents
battery charging when VDD is less than 3.6V.
The LX2202 uses three resistors to
program the constant charge current level, for
setting the termination charge current, and for
varying the USB charge current limits.
LX2202 support two types of Li-Ion
battery chemistry; 4.1V and 4.2V through
logical input (VM pin). The LX2202
provides a charging status indicator.
The LX2202 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 LX2202 is available in a high power
4mm x 4mm, 20-pin MLP, surface mount
package.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
ƒ Up to 2A Charge Current
ƒ Internal Pass Element Can
Function as a Reverse Direction
Load Switch
ƒ USB Compliant Charging States
using optional USB input
ƒ Isolated Battery Topology
ƒ Low Rds_ON in Discharge Mode
ƒ Full Capacity Charging
ƒ True Charge Indicator
ƒ Wall Supply Regulator Tolerance
5V + 10%
ƒ Topping Charge with Voltage
Monitoring Mode
ƒ Improved charge/discharge mode
detection circuitry
ƒ Small, High Power 20-lead MLP
package
ƒ Selectable Li-Ion Battery for 4.1V
or 4.2V Applications
APPLICATIONS
ƒ Batteries up to 4AH Ratings (C/2)
ƒ Cell Phones
ƒ PDAs
ƒ Charging Cradles
ƒ Digital Cameras
ƒ Low Cost Single Li-Ion Cell Chargers
Power On/Off
Main Internal
Power Bus
B220
Wall Adapter
10µF
PRODUCT HIGHLIGHT
VDD
NU
VDD
BAT
VDD LX2202 BAT
VDD
BAT
USB
CMP
2.55k
105k 72.3k
0.1µF
To VDD
10µF
Charge
Indicator
2.49k
VID0
0
0
1
1
VID1
0
1
0
1
State Select Truth Table
VDD > V_BAT
Switch open – charging
V_BAT > VDD
Switch open – discharge
disabled.
disabled.
Charging – USB high level if Switch open – discharge
using USB.
disabled.
Charging – USB low level if
using USB.
Charging – USB high level if
using USB.
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(°C)
Plastic MLP
LQ _{4x4mm 20-Pin}
RoHS Compliant / Pb-free
-40 to 125
LX2202CLQ
Note: Available in Tape & Reel.
Append the letters “TR” to the part number.
(i.e. LX2202CLQ-TR)
Copyright © 2004
Rev. 1.0, 2005-03-18
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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