LX2201 [MICROSEMI]
USB Li-Ion Battery Charger; USB锂离子电池充电器
| 型号： | LX2201 |
| 厂家： | 
Microsemi |
| 描述： | USB Li-Ion Battery Charger |
| 文件： | 总11页 (文件大小：172K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION DATA SHEET
KEY FEATURES
DESCRIPTION
2A Charge Current
The LX2201 Linear Battery Charger is a
LX2201 support two types of Li-Ion
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
multi-state (2 stage) Li-Ion battery charger battery chemistry; 4.1V and 4.2V through
(Constant current / Constant voltage) that logical input (VM pin).. A high accuracy
can supply up to 2A of charging current into current sensing circuit allows batteries to
a single cell Li-Ion battery.
be fully charged before terminating the
The LX2201 design
LX2201 is a cost effective , high perfor- charge cycle.
mance USB battery charger. The LX2201 enhances system battery life by avoiding
features a 2A high charge current, with premature discharge of Li-Ion battery with
automatic power savings using isolated a separate battery terminal voltage from
battery topology, user programmability in system load when adaptor charging is used,
USB charging, and an extended battery life i.e. trickle charge.
with low RdsON in discharge.
The LX2201 provides a charging status
In USB mode, the LX2201 has indicator. The integrated PMOS pass element
advantages over competition chargers with features low drop out voltage while providing
the USB Limit Control circuit and low an inherent load disconnect with virtually no
RdsON in discharge mode. The USB limit drain on the battery when disabled or when
Control circuit allows simultaneous battery the input power is removed. Additionally a
charging while the device is in operation. battery load disconnect switch has been
The VDD to supply load is independent of integrated which provides seamless power
the VBAT charging logic. In discharge mode switching when transitioning between charge
a low RdsON provides low loss and heavy and discharge modes.
Inherent Load Disconnect
Small, High Power 20-lead MLP
package
transient.
The LX2201 features
a
pre-charge
The LX2201 is a low cost, highly conditioning mode for batteries that have
integrated battery charger solution. . It only been deeply discharged and also has a top off
requires three external resistors: one for charge mode for batteries that are left on the
setting the constant charge current level, one charger for extended periods.
APPLICATIONS
Batteries with 350mAH to 2AH
Ratings
for setting the termination charge current,
The LX2201 is available in a high power
Cell Phones
PDAs
Charging Cradles
Digital Cameras
Low Cost Single Li-Ion Cell
Chargers
and one for setting VIN . It also has a built 4mm x 4mm, 20-pin MLP, surface mount
in thermostat that will throttle back the package.
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.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
State Select Truth Table
VDD > VBAT
USB Lo / Hi
VID0 VID1
VBAT > VDD
Switch open – charging
disabled.
Charging – USB high level if
using VIN.
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.
To System
Regulator
0
0
0
1
BAT
BAT
BAT
BAT
CMP
VDD
VDD
VDD
VDD
VIN
AC/DC Adapter
Charging – USB low level if
using VIN.
1
1
0
1
USB POWER
Charging – USB high level if
using VIN.
PACKAGE ORDER INFO
Plastic MLP
4x4mm 20-Pin
Note: Available in Tape & Reel.
Append the letters “TR” to the part number.
(i.e. LX2201CLQ-TR)
LQ
TA(°C)
RoHS Complaint / Pb-free
0 to 70
LX2201CLQ
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Page 1
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
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.................................................................. 150°C
Storage Temperature Range...........................................................-65°C to 150°C
Peak Package Solder Reflow Temp. (40 second max. exposure) ... 260°C (+0, -5)
VIN Maximum DC Current..........................................................................500mA
VIN Maximum Surge Current.............................................................................2A
20
19
18
17
16
VDD
VDD
VDD
VDD
VIN
15
14
13
12
11
1
2
3
4
5
BAT
BAT
BAT
BAT
CMP
Pad Is GND
10
6
7
8
9
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal
.
LQ PACKAGE
(Top View)
THERMAL DATA
N.C. – No Internal Connection
RoHS / Pb-free 100% Matte Tin Lead Finish
Plastic Micro Lead Frame Quad Package 20-Pin
LQ
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT, θJA
40°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the
above assume no ambient airflow.
FUNCTIONAL PIN DESCRIPTION
Name
Description
BAT
Charging Output - This pin is wired to the positive terminal of the battery. (The negative battery terminal is wired to GND.)
Charge Current Programming Pin - A resistor (RCP) is connected between this pin and GND. The constant current is
CCP
CMP
CTP
65000
=
RCP
determined by the following relationship:
IBAT(MAX)
Compensation Pin – Connect a 0.1uF compensation capacitor from this pin to VDD.
Charge Termination Programming Pin – A resistor (RTP) is connected between this pin and GND. The termination charge
7500
RTP
current is determined by the following relationship:
IBAT(MIN)
=
Maximum VIN Current Programming Pin – A resistor (RUS) is connected between this pin and GND. The Hi Level charge
CUS
1211
current is determined by the following relationship:
IIN(HI))
=
RUS
GND
NC
Common Ground
Not Connected. This pin is connected internally and should be left floating.
PMOS Switch driver – This output is designed to drive the gate of an external PMOS power switch. The driver is pulled low
PSW
VDD
VIDx
VIN
(PMOS on state) when VDD > VBAT
.
Common Power Node – Connects to system power bus.
State Select Input – Applying a two bit TTL compatible signal sets the desired state of the charger corresponding to the Truth
Table.
Voltage Input – Current limited USB input. Apply a USB compliant power input.
Voltage Mode Select - Selects the constant voltage. VM = Low to select 4.2V charge level. VM = High to select 4.1V charge
level.
VM
Status - This pin is a logic high level when the battery is being charged. A low signal indicates either under voltage lockout,
charge completed, or VBAT > VDD, or VID0 = VID1 = 0.
STAT
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Page 2
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C
otherwise noted and the following test conditions: VDD = 5.0V.
≤
TA
≤
70°C except where
LX2201
Typ
Parameter
Symbol
Test Conditions
Units
Min
Max
MAIN CIRCUITRY
`
Input Voltage
VDD
IGND
4.5
6
8
5
V
mA
µA
V
V
V
VDD > VBAT
VDD < VBAT
RCTP = 150K, IBAT > 100mA
4
3
1.25
1.25
2.6
Quiescent Current
CTP Bias Voltage
CCP Bias Voltage
CUS Bias Voltage
VCTP
VCCP
VCUS
CONSTANT VOLTAGE MODE
`
`
VM = Low
VM = High
VIN – VBAT IBAT = 1A
4.16
4.06
4.2
4.1
4.24
4.14
350
Constant Voltage Charge Level
VCVL
V
Maximum Dropout Voltage
mV
VBAT
%
Top Off Charge Droop Threshold
VDRP
96
97
1
98
VCVL
CONSTANT CURRENT MODE
BAT Constant Current Accuracy
BAT Constant Current Level
ICCL
IBAT
RCCP = 64.9K
VBAT < (VCVL – 100mV)
0.85
0.35
1.15
2
A
A
IBAT
%
Conditioning Current
ICOND
3.0
4.75
6.0
VBAT < VCTV ; @25°C
ICCL
V
BAT
%
Conditioning Current Mode
Threshold Voltage
Charge Termination Current
Accuracy
VCTV
IBAT
60
35
64
50
68
65
VCVL
mA
RCTP = 150K ; @25°C
USB CURRENT LIMIT
`
`
USB Low Current Limit
USB High Current Limit
LOGIC
IIN
IIN
VIN = 5V, VDD < VIN, VID1 = Lo, RUSB = 2.55K
VIN = 5V, VDD < VIN, VID1 = Hi, RUSB = 2.55K
85
425
93
463
100
500
mA
mA
STAT Logic High Output
STAT Logic Low Output
VSTAT
VSTAT
VIN = 5.0V, ISTAT = -5mA
VIN = 5.0V, ISTAT = 25µA
Logic High
Logic Low
Logic High
4.5
5
0.4
V
V
2.0
2.0
State Select Threshold
VM Select Threshold
VVID
VVM
V
V
0.8
0.8
150
Logic Low
THERMAL SHUTDOWN
Maximum Junction Temperature
`
`
TJ
VIN = 5.0V, IOUT = 1A, Temperature Rising
130
140
°C
BI-DIRECTIONAL PASS ELEMENT CONTROL
Discharge Switch On Resistance
Charging Threshold
RDS(ON)
VCHG
VDCH
tsw
IBAT = -1A
VIN > VBAT + VCHG
VIN > VBAT + VDCH
Charge–to–discharge or Discharge–to–charge
130
5
5
150
10
10
m
Ω
0
0
mV
mV
µs
Discharging Threshold
Pass Element Switch Mode Delay
PSW FET DRIVER
5
`
High Output Voltage
Low Output Voltage
OR-ing Resistance
Switch Delay
(VDD > VBAT to VDD < VBAT
VPSW
VPSW
RPSW
VIN < VBAT, IPSW = 0, VBAT = 4.2V
VIN > VBAT, IPSW = 0
4.1
4.2
0
10
V
V
0.2
15
5
0
K
Ω
tPSW
CPSW = 1000pF, to VPSW = (VBAT – 1V)
500
1000
Ns
)
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Page 3
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION DATA SHEET
SIMPLIFIED BLOCK DIAGRAM
PSW
VID0
CHARGE/
DISCHARGE
CONTROL
STAT
VDD
VIN
0.1
BAT
CHARGE
TERMINATION
CONTROL
CTP
USB
LIMIT
CONTROL
CUS
VID1
CONSTANT
VOLTAGE
CONTROL
VM
CMP
TEMPERATURE
CONTROL
CONSTANT
CURRENT
CONTROL
CCP
GND
Figure 1 – Simplified Block Diagram
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Page 4
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION DATA SHEET
APPLICATION CIRCUITS
LX2201 CONTROL FLOW DIAGRAM
RETURN TO START IF
START
VIN > VBAT OR VIDX CHANGE STATE.
NO
V
DD > VBAT
YES
NO
VID0 = 1
YES
NO
VID0 = 1
YES
NO
SWITCH
OFF
VID0 = 1
CONDITION
CHARGE
MODE
NO
YES
V
BAT>60%
YES
DISCHARGE
MODE
I
USB DETERMINED BY THE
STATE OF VID1.
CONSTANT CURRENT
CHARGE MODE
REDUCE
CHARGE
CURRENT
NO
NO
TEMP < 140
YES
REDUCE
CHARGE
CURRENT
NO
TEMP < 140
YES
REDUCE
CHARGE
CURRENT
I
IN <
I
USB
YES
REDUCE
CHARGE
CURRENT
NO
I
IN < IUSB
YES
NO
I
BAT<IMIN
YES
NO
V
BAT> VCV
YES
VOLTAGE
MONITORING
MODE (STATE).
CONSTANT VOLTAGE
CHARGE MODE
NO
V
BAT<97%
YES
RETURN TO THE TOP
OF THE CHART.
Figure 2 – Control Flow Diagram
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Page 5
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION
D
ATA
S
HEET
APPLICATION SCHEMATICS
USB Lo / Hi
To System
Power Bus
VDD
VDD
VDD
VDD
VIN
BAT
BAT
BAT
BAT
CMP
10uF
LX2201
AC/DC Adapter
0.1uF
USB POWER
150k
75k
2.5k
10uF
Figure 3 – AC Adapter and USB Supply (Charge and Discharge Modes)
APPLICATION SCHEMATICS (CONTINUED)
Off / On
To System
Power Bus
VDD
VDD
VDD
VDD
VIN
BAT
BAT
BAT
BAT
CMP
10uF
LX2201
AC/DC Adapter
10uF
0.1uF
100K
TO BAT
499k
TO VDD
576k
499k
DMMT3906W
150k
75k
2.5k
499k
Figure 4 – AC Adapter with charging voltage headroom regulation (for use with a current limited power supply)
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Integrated Products Division
Page 6
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION DATA SHEET
54
52
50
48
46
44
42
40
101.5
101
100.5
100
99.5
99
98.5
98
-55
-35
-15
5
25
45
65
85
-55
-35
-15
5
25
45
65
85
Ambient Temperature (°C)
Ambient Temperature (°C)
Chart 1 – Charging Current Accuracy over Temperature
Chart 2 – Termination Current over Temperature
463.2
463
92.9
92.8
92.7
92.6
92.5
92.4
92.3
92.2
92.1
92
462.8
462.6
462.4
462.2
462
4
4.5
5
5.5
6
6.5
4
4.5
5
5.5
6
6.5
VIN Voltage (V)
VIN Voltage (V)
Chart 3 – USB High Current over VIN Voltage
Chart 4 – USB Low Current over VIN Voltage
1000
800
600
400
200
5
4
3
2
1
103
102.5
102
101.5
101
100.5
100
99.5
99
0
50
100
150
200
250
4
4.5
5
5.5
6
6.5
Time (minutes)
VDD Voltage (V)
Chart 6 – Battery Current & Voltage vs. Time
Chart 5 – Charging Current over VDD Voltage
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Page 7
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION DATA SHEET
THEORY OF OPERATION
G
ENERAL
DESCRIPTION
TOP OFF CHARGE MODE
The LX2201 is designed to charge a single cell Lithium
Once the charger has completed a charge cycle, if
Ion battery using two steps: a constant current step
followed by a constant voltage step. The basic charger
function uses the VDD pins as an input and BAT pins as
the output. The LX2201 charger has a programmable
maximum current (programmable by the resistor value
between pin CCP to GND) which is the maximum
charging current during the Constant Current Mode of the
charging profile. The low dropout of the pass element
allows the battery to be charged from a loosely regulated
power supply. In the Constant Voltage Mode, the battery
terminal voltage can be regulated to 4.1V or 4.2V by
strapping the VM pin to VDD or GND, respectively. The
charger will terminate constant voltage charging once the
current drops below the minimum current setting
(programmable by the resistor value between pin CTP to
GND).
power remains applied, the LX2201 enters a Voltage
Monitoring mode. In this mode the LX2201 monitors the
battery terminal voltage and applies a top off charge if the
battery voltage drops by more than 3% of full scale. This
feature is especially important for charging systems in
equipment where usage is infrequent.
USB CHARGE
MODE
The LX2201 is fully compliant with, and supports, the
USB specifications – the Low Power Peripheral (100mA)
and High Power Peripherals (500mA). VID1 logic input
selects USB charge currents. The LX2201 senses the
current flowing from the VIN terminal to the VDD
terminal; then it limits the VIN current by reducing the
current flowing from VDD to VBAT
.
Note: the USB
Charge Limit circuit does not limit the input current and
only scales the charging current.
The LX2201 has an integrated thermostat with a linear
thermal regulation loop that will throttle back the charging
current to prevent the internal die temperature from
exceeding 150ºC. This feature prevents damage to the
system board when the IC exceeds its thermal temperature.
DISCHARGE MODE
In discharge mode, VID0 is, indicate discharge mode
enable. The system load is connected to VDD. The input
power is connected to VDD through an internal diode.
When the input power is removed, the battery current
flows from VBAT to VDD. The circuit of Figure 3 shows
the LX2201 in a discharge mode configuration with both
AC adapter and USB inputs. The USB input is diode
ORed to the VDD pin and uses a MOSFET to reduce the
diode drop across the ORing diode. The LX2201 provides
a signal “PSW” to control the MOSFET for charge and
discharge modes. When both AC and USB power are
applied the PSW signal is overridden by the AC adapter
diode and the MOSFET is turned off
CURRENT CHARGE MODE
A conditioning current is applied to batteries that are
deeply discharged and have a terminal voltage less than
60% of the constant voltage level. The conditioning current
is 5% of the CCP programmable constant current level
(except where it might be limited in the USB states). Once
the battery terminal voltage exceeds the 60% level, the full
constant current level is applied (unless charging current is
limited by one of the other charger control loops).
CHARGE TERMINATION MODE
To increase system battery life and avoid float charging,
the LX2201 turns off the pass element once the battery has
been fully charged. The charge termination state occurs at
the end of constant voltage mode. The charge status
changes state when charging is completed.
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Page 8
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION DATA SHEET
APPLICATION NOTE
CURRENT
L
IMITED
P
OWER
SUPPLIES
USB COMPLIANCE
When using input power supplies that are current limited
To be compliant with the USB specification, the +5V
current must be less than 100mA in the low power mode
and less than 500mA in the high power mode. If the
LX2201 is configured as shown in Figure 3, it is possible
for the system to consume more than the maximum
allowed USB current (in which case the battery charging
current will have been fully scaled back). If it is not
possible to regulate the load current when charging from a
USB power source and strict adherence to the USB power
budget is required. In this case the system load can be
applied directly to the battery and the LX2201 will prevent
the load + battery from drawing more power than is
allowed for USB compliance. A better approach that
provides battery isolation may be used; in this approach,
the op amp circuit provides a current limiter that prevents
the system from exceeding the USB power limits. The
battery is only discharged if the AC adapter or USB inputs
are removed or current limited.
or have high source impedance, the battery charging current
and/or load current can pull the VDD pin down very close
to the battery terminal voltage. This may cause the LX2201
to enter an indeterminate state where it switches between
charge and discharge modes. To prevent this, the PNP
differential amplifier circuit of figure 4 can be added; this
circuit adds an additional control loop that regulates the
charger headroom to 300mV by scaling back the battery
charging current.
The internal power switch within the LX2201 requires
the power supply have a minimal level of strength to switch
from discharge mode to charge mode. If the power source is
severely current limited, the LX2201 may not open the
discharge switch. In this case, a small amount of current
will be allowed to flow into the battery unregulated. If left
in this state indefinitely, the current will eventually raise the
battery terminal voltage to the point where the batteries
internal protection circuitry will open the circuit. Typically,
the LX2201 requires a minimum of 80mA in USB mode
and 200mA using the VDD input to force the switchover to
charge mode. Alternatively, if weak power sources are
used, the switchover from discharge to charge mode can be
forced by momentarily setting VID0 and VID1 to a low
state, which will open the discharge switch allowing the
VDD voltage to rise so the LX2201 can enter charge mode.
L
AYOUT GUIDELINES
•
It is important when laying out the LX2201 to
place 10µF ceramic capacitors close to the VDD
and VBAT IC terminals to filter switching transients.
•
It is important to provide a low thermal impedance
path from the thermal pad on the bottom of the
LX2201 package to the ground plane of the circuit
board to maximize the heat dissipation.
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Page 9
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION DATA SHEET
PACKAGE DIMENSIONS
20-Pin MLPQ Plastic 4x4mm (114x114DAP)
LQ
D
b
M
ILLIMETERS
I
NCHES
Dim
MIN
0.80
0.00
MAX
MIN
MAX
L
A
A1
A3
b
D
D2
E
E2
e
L
1.00 0.031 0.039
0.05 0.000 0.002
0.20 REF
0.008 REF
D2
E
0.18
2.59
2.59
0.30
0.30 0.007 0.088
4.00 BSC
0.157 BSC
2.79 0.102 0.110
4.00 BSC
0.157 BSC
E2
e
2.79 0.102 0.110
0.50 BSC
0.019 BSC
0.50 0.011 0.019
A1
A
A3
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Page 10
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX2201
®
USB Li-Ion Battery Charger
TM
P
RODUCTION DATA SHEET
NOTES
PRODUCTION DATA – Information contained in this document is proprietary to
Microsemi and is current as of publication date. This document may not be modified in
any way without the express written consent of Microsemi. Product processing does not
necessarily include testing of all parameters. Microsemi reserves the right to change the
configuration and performance of the product and to discontinue product at any time.
Copyright © 2000
Rev. 1.2b, 2005-04-13
Microsemi
Page 11
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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