XC6801
Series
500mA 1 Cell Li-ion and Li-Po Battery Linear Charger IC
with Constant-Current/Constant-Voltage
ETR2502-006
■GENERAL
DESCRIPTION
The XC6801 series is a constant-current/constant-voltage linear charger IC for single cell Lithium-ion and Lithium polymer
batteries. The XC6801 includes a reference voltage source, battery voltage monitor, driver transistor,
constant-current/constant-voltage charge circuit, overheat protection circuit and phase compensation circuit. The battery
charge termination voltage is internally set to 4.2V
±0.7%
and the trickle charge voltage and accuracy is 2.9V
±3%.
full charge current is supplied to the battery.
In
trickle charge mode, a safe Lithium-ion and Lithium polymer battery charge is possible because approximately only 1/10 of the
As it is possible to select a highly accurate charge current of either 100mA
(MAX.) for L level input to the L
IM
pin or 500mA (MAX.) for H level, the series is ideal for applications where the charge is from
USB. The series’ charge status output pin, /CHG pin, is capable of checking the IC’s charging state via connection to an
external LED.
■APPLICATIONS
●
●
●
●
●
USB charge applications
Charging docks, charging cradles
MP3 players, portable audio players
Cellular phones, PDAs
Bluetooth headsets
■
FEATURES
Operating Voltage Range
Charge Current
(externally set)
Charge Termination Voltage
Trickle Charge Voltage
Supply Current (Stand-by)
Operating Ambient Temperature
Packages
with thermal shutdown
Automatic recharge
Charge status output pin
Soft-start function (Inrush limit current)
Environmentally Friendly
: EU RoHS Compliant, Pb Free
: 4.25V ~ 6.0V
: 100mA (MAX.) @ L
IM
pin=L
500mA (MAX.) @ L
IM
pin=H
: 4.2V
±0.7%
: 2.9V
±3%
: 12μA (TYP.)
: - 40℃~ + 85℃
: SOT-89-5, SOT-25, USP-6C
Constant-current/constant-voltage operation
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
●Battery
Charge Cycle
X C6 8 0 1 A4 2 1
V
IN
=V
Lim
=5V, C
IN
=1.0μF
420mAh Battery
1000
900
Charge Current I
BAT
(mA)
800
700
600
500
400
300
200
100
0
0
0.3
0.6
0.9
1.2
1.5
Time (hour)
Charge Current(Lim:H)
Battery Voltage
4.5
4.2
3.9
3.6
3.3
3.0
1/20
Battery Voltage V
BAT
(V)
XC6801
Series
■PIN
CONFIGURATION
* The dissipation pad for the USP-6C package should be solder-plated in recommended mount pattern and
metal masking so as to enhance mounting strength and heat release. If the pad needs to be connected to
other pins, it should be connected to the V
SS
(No. 2) pin.
■PIN
ASSIGNMENT
PIN NUMBER
SOT-25
1
2
3
4
5
-
SOT-89-5
5
2
4
3
1
-
USP-6C
3
2
1
6
4
5
PIN NAME
/CHG
V
SS
BAT
V
IN
L
IM
NC
FUNCTIONS
Charge Status Output Pin
Ground
Charge Current Pin
Input Voltage Pin
Changing Current Switch
No Connection
■
FUNCTIONS
XC6801A421
PIN NAME
L
IM
L
H
CONDITIONS
0V≦V
LIM
≦0.4V
1V≦V
LIM
≦6V
IC OPERATION
Charging Battery Current 1 (CC Mode)
Charging Battery Current 2 (CC Mode)
*If L
IM
pin is left open, battery current is unstable. L
IM
pin level should be fixed “High” or “Low”.
■
PRODUCT CLASSIFICATION
●Ordering
Information
XC6801A42①②③-④
DESIGNATOR
①
ITEM
Setting Charge Current
Packages
(Order Unit)
SYMBOL
1
PR-G
MR-G
ER-G
DESCRIPTION
L
IM
”L”=95mA, L
IM
”H”=475mA
SOT-89-5
(1,000pcs/Reel)
SOT-25
(3,000pcs/Reel)
USP-6C
(3,000pcs/Reel)
②③-④
(
*1
)
(*1)
The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
2/20
XC6801
Series
■BLOCK
DIAGRAM
* Diodes inside the circuits are ESD protection diodes and parasitic diodes.
■ABSOLUTE
MAXIMUM RATINGS
Ta=25℃
PARAMETER
V
IN
Pin Voltage
L
IM
Pin Voltage
BAT Pin Voltage
/CHG Pin Voltage
BAT Pin Current
SOT-25
Power Dissipation
SOT-89-5
USP-6C
Operating Ambient Temperature
Storage Temperature
Topr
Tstg
Pd
SYMBOL
V
IN
V
LIM
V
BAT
V
/CHG
I
BAT
RATINGS
-0.3
½
+6.5
-0.3
½
+6.5
-0.3
½
+6.5
-0.3
½
+6.5
900
(*1)
250
600
（PCB
mounted）
(*2)
500
1300
（PCB
mounted）
(*2)
120
1000
（PCB
mounted）
(*2)
- 40 ~ + 85
- 55 ~ + 125
℃
℃
mW
UNIT
V
V
V
V
mA
All voltages are described based on the V
SS
pin.
(*1) Please use within the range of I
BAT
≦Pd/（V
IN
-V
BAT
）.
(*2) The power dissipation figure shown is PCB mounted.
Please see the power dissipation page for the mounting condition.
3/20
XC6801
Series
■ELECTRICAL
CHARACTERISTICS
XC6801A421
Ta=25℃
PARAMETER
Input Voltage
Supply Current
Stand-by Current
Shut-down Current
Float Voltage 1
Float Voltage 2
(*1)
Battery Current 1
Battery Current 2
Battery Current 3
Battery Current 4
Battery Current 5
Trickle Charge Current 1
Trickle Charge Current 2
Trickle Voltage
Trickle Voltage
Hysteresis Width
UVLO Voltage
UVLO Hysteresis Width
V
IN
-V
BAT
Shut-down Voltage
V
IN
-V
BAT
Shut-down Voltage
Hysteresis Width
C/10 Charge Termination
Current Threshold
/CHG Pin
Weak Pull-Down Current
/CHG Pin
Strong Pull-Down Current
/CHG Pin
Output Low Voltage
Recharge Battery
Threshold Voltage
ON Resistance
Soft-Start Time
Recharge Battery Time
Battery Termination
Detect Time
L
IM
Pin "H" Level Voltage
L
IM
Pin "L" Level Voltage
L
IM
Pin "H" Level Current
L
IM
Pin "L" Level Current
Thermal Shut-Down
Detect Temperature
Thermal Shut-Down
Release Temperature
SYMBOL
V
IN
I
SS
I
STBY
I
SHUT
V
FLOAT1
V
FLOAT2
I
BAT1
I
BAT2
I
BAT3
I
BAT4
I
BAT5
I
TRIKL1
I
TRIKL2
V
TRIKL
V
TRIKL_HYS
V
UVLO
V
UVLO_HYS
V
ASD
V
ASD_HYS
I
TERM
I
/CHG1
I
/CHG2
V
/CHG
∆V
RECHRG
R
ON
t
SS
t
RECHRG
t
TERM
V
LIM_H
V
LIM_L
I
LIM_H
I
LIM_L
T
TSD
T
TSR
Junction temperature
Junction temperature
CONDITIONS
Charge mode
（V
LIM
=H or V
LIM
=L）
Stand-by mode
Shut-down mode
(V
IN
<V
BAT
or V
IN
<V
UVLO
）
Ta=25℃, I
BAT
=40mA
0℃≦Ta≦50℃, I
BAT
=40mA
V
BAT
=3.8V, V
LIM
=L, CC mode
V
BAT
=3.8V, V
LIM
=H, CC mode
Stand-by mode, V
BAT
=4.2V
Shut-down mode
Stop mode, V
IN
=0V
V
BAT
<V
TRIKL
（V
LIM
=L
）
V
BAT
<V
TRIKL
（V
LIM
=H
）
V
LIM
=L, V
BAT
Rising
V
LIM
=L
V
IN
: L
→
H
-
V
IN
: L
→
H
-
V
LIM
=L
V
LIM
=H
V
BAT
=4.3V, V
/CHG
=5V
V
BAT
=4.0V, V
/CHG
=1V
I
/CHG
=5mA
V
FLOAT1
-V
RECHRG(*2)
-
I
BAT
= 0
→
I
BAT2
(V
LIM
=H)
V
BAT
: H
→
L
I
BAT
falling (Less than I
TERM
)
MIN
4.25
-
-
-
×0.993
×0.99
88
440
-
-
-
7.5
37.5
2.813
58
3.686
150
70
50
0.07
0.07
8
4
-
100
300
120
0.4
0.3
1
-0.1
-0.1
120
100
0.4
0.1
0.1
TYP
-
12
12
8
4.2
4.2
95
475
-
-
-
9.5
47.5
2.9
90
3.8
190
100
70
0.1
0.1
20
10
0.35
150
450
150
1.7
1.2
MAX
6.00
30
30
18
×1.007
×1.01
100
500
2.5
2.0
2.0
12.0
60.0
2.987
116
3.914
280
140
90
0.13
0.13
35
18
0.60
200
800
180
3.2
2.4
UNIT
V
μ
A
μ
A
μ
A
V
V
mA
mA
μ
A
μ
A
μ
A
mA
mA
V
mV
V
mV
mV
mV
mA/mA
mA/mA
μ
A
mA
V
mV
mΩ
μ
s
ms
ms
V
V
μ
A
μ
A
℃
℃
CIRCUIT
-
③
③
③
②
-
③
③
③
③
③
③
③
③
③
⑥
-
③
-
②
②
③
③
④
③
①
⑤
⑥
⑥
③
③
①
①
-
-
Unless otherwise stated, V
IN
=5.0V.
(*1) The figures under the condition of 0
O
C≦T
a
≦50
O
C are guaranteed by design calculation.
(*2) V
RECHRG
is a voltage to start recharging while reducing V
BAT
in stand-by mode from the full charge.
4/20
XC6801
Series
■OPERATIONAL
DESCRIPTION
Charge Cycle
(Charge Main Routine)
Failure Detection
Trickle Charge
Input Voltage Monitor (UVLO)
V
IN
-BAT Voltage Monitor (UVLO)
V
BAT
>2.9V
Shut-Down
Shut-Down
Constant-Current Charge (CC)
Constant-Voltage Charge (CV)
V
IN
≧3.8V
△(V
IN
-V
BAT
)>0.1V
V
LIM
-“L” I
BAT
≦I
BAT1
/10
V
LIM
-“H” I
BAT
≦I
BAT2
/10
Maintaining the charge state
during a charge termination
detect time (1.2ms)
Charge Termination
(Stand-by mode)
Charge Cycle
Charge Cycle
Yes
V
IN
≧3.61V
△(V
IN
-V
BAT
)<0.03V
No
V
BAT
≦4.05V
Maintaining the stand-by mode
during a recharge time (1.7ms)
V
BAT
≦2.9V
<Charge Cycle>
If the BAT pin trickle voltage is less than 2.9V(TYP.), the charger enters trickle charge mode. In this mode, a safe battery
charge is possible because approximately only 1/10 of the charge current is supplied to the battery. When the BAT pin voltage
rises above trickle voltage, the charger enters constant-current mode (CC mode) and the battery is charged by the programmed
charge current. When the BAT pin voltage reaches 4.2V, the charger enters constant-voltage mode (CV mode) automatically.
After this, the charge current starts to drop and when it reaches a level which is 1/10 of the programmed charge current, the
charge terminates.
<Setting Charge Current>
The charge current can be set from 475mA（TYP.）or 95mA（TYP.）by the L
IM
pin.
L
IM
”H” level input：475mA（TYP.）
L
IM
”L” level input：95mA（TYP.）
<Charge Termination>
The battery charge is terminated when the charge current decreases to 1/10 of the full charging level after the battery pin
voltage reaches a float voltage. An internal comparator monitors the I
SEN
pin voltage to detect the charge termination. When
the comparator sees that the I
SEN
pin voltage is less than 1.2ms (charge termination detect time), the IC enters stand-by mode.
A driver transistor turns off during the stand-by mode.
<Automatic Recharge>
In stand-by mode battery voltage falls. When the voltage level at the battery pin drops to recharge battery threshold voltage
4.05V(TYP.) or less, the charge cycle automatically re-start after a delay of 1.7ms. As such, no external activation control is
needed.
5/20
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