F
XC6801 Series
ETR2502-004
1 Cell Li-ion Battery Linear Charger IC
with Constant-Current/Constant-Voltage
■GENERAL DESCRIPTION
The XC6801 series is a constant-current/constant-voltage linear charger IC for single cell lithium-ion 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%. In trickle charge mode, a safe battery charge is possible
because approximately only 1/10 of the full charge current is supplied to the battery. As it is possible to select a highly
accurate charge current of either 100mA (MAX.) for L level input to the L
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
■TYPICAL APPLICATION CIRCUIT
■ FEATURES
Operating Voltage Range : 4.25V ~ 6.0V
Charge Current
(externally set)
Charge Termination Voltage : 4.2V ±0.7%
Trickle Charge Voltage : 2.9V ±3%
Supply Current (Stand-by)
Operating Ambient Tempera ture
Packages : SOT-89-5, SOT-25, USP-6C
Constant-current/constant-voltage operation
with thermal shutdown
Automatic recharge
Charge status output pin
Soft-start function (Inrush limit current)
Environmentally Friendly : EU RoHS Compliant, Pb Free
pin or 500mA (MAX.) for H level, the series is ideal
IM
: 100mA (MAX.) @ LIM pin=L
500mA (MAX.) @ L
: 12μA (TYP.)
: - 40℃~ + 85℃
■TYPICAL PERFORMANCE
CHARACTERISTICS
●Battery Charge Cycle
XC6801A421
1000
900
800
(mA)
700
BAT
600
500
400
300
Charge Current I
200
100
Char ge Cur ren t(Lim: H)
0
0 0.3 0.6 0.9 1.2 1.5
Time (hour)
V
=5V, CIN=1.0μ
IN=VLim
420mAh Battery
Battery Voltage
pin=H
IM
4.5
4.2
3.9
3.6
3.3
3.0
(V)
BAT
Battery Voltage V
1/19
XC6801 Series
■PIN CONFIGURATION
■PIN ASSIGNMENT
SOT-25 SOT-89-5 USP-6C
■ FUNCTIONS
XC6801A421
PIN NUMBER
1 5 3 /CHG Charge Status Output Pin
2 2 2 VSS Ground
3 4 1 BAT Charge Current Pin
4 3 6 VIN Input Voltage Pin
5 1 4 LIM Changing Current Switch
- - 5 NC No Connection
PIN NAME CONDITIONS IC OPERATION
LIM
L
H
pin is left open, battery current is unstable. L
*If L
IM
■ PRODUCT CLASSIFICATION
●Ordering Information
XC6801A42①②③-④
* 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
PIN NAME FUNCTION
0V≦V
1V≦V
≦0.4V
LIM
LIM
≦6V
(No. 2) pin.
SS
Charging Battery Current 1 (CC Mode)
Charging Battery Current 2 (CC Mode)
pin level should be fixed “High” or “Low”.
IM
DESIGNATOR ITEM SYMBOL DESCRIPTION
① Setting Charge Current 1 LIM”L”=95mA, LIM”H”=475mA
PR-G
MR-G
②③-④
(*1)
Packages
(Order Unit)
ER-G
(*1)
The “-G” suffix denotes Halogen and Antimony free as well as being fully RoHS compliant.
SOT-89-5 (1,000/Reel)
SOT-25 (3,000/Reel)
USP-6C (3,000/Reel)
2/19
■BLOCK DIAGRAM
■ABSOLUTE MAXIMUM RATINGS
* Diodes inside the circuits are ESD protection diodes and parasitic diodes.
Ta =2 5℃
PAR AMETER SYMBOL RATINGS UNIT
VIN Pin Voltage VIN
LIM Pin Voltage VLIM
BAT Pin Voltage VBAT
/CHG Pin Voltage V/CHG
BAT Pin Current IBAT 900
Power Dissipation
SOT-25
SOT-89-5
USP-6C
Pd
-0.3 ～ +6.5
-0.3 ～ +6.5
-0.3 ～ +6.5
-0.3 ～ +6.5
(*1)
mA
250
600 （PCB mounted）
500
1300 （PCB mounted）
120
1000 （PCB mounted）
(*2)
(*2)
(*2)
Operating Ambient Temperature Topr - 40 ~ + 85 ℃
Storage Temperature Tstg - 55 ~ + 125 ℃
All voltages are described based on the VSS pin.
(*1) Please use within the range of I
(*2) The power dissipation figure shown is PCB mounted. Please refer to page 16 to 18 for details.
≦Pd/（VIN-V
BAT
BAT
）.
V
V
V
V
mW
XC6801
Series
3/19
XC6801 Series
■ELECTRICAL CHARACTERISTICS
XC6801A421
PAR AMETER SYMBOL CONDITIONS MIN TYP MAX UNIT CIRCUIT
Input Voltage VIN
Supply Current ISS
Stand-by Current I
Shut-down Current I
Float Voltage 1 V
Float Voltage 2
(*1)
V
Battery Current 1 I
Battery Current 2 I
Battery Current 3 I
Battery Current 4 I
Battery Current 5 I
Trickle Charge Current 1 I
Trickle Charge Current 2 I
STBY
SHUT
FLOAT1
FLOAT2
BAT1
BAT2
BAT3
BAT4
BAT5
TRIKL1
TRIKL2
Charge mode （V
Stand-by mode - 12 30
V
V
Shut-down mode
(VIN<V
or VIN<V
BAT
Ta=25℃, I
0℃≦Ta≦50℃, I
=3.8V, V
BAT
=3.8V, V
BAT
LIM
LIM
Stand-by mode, V
Shut-down mode - - 2.0
Stop mode, VIN=0V - - 2.0
V
BAT<VTRIKL（VLIM
V
BAT<VTRIKL（VLIM
LIM
=H or V
LIM
4.25 - 6.00 V
=L）
- 12 30
μA ③
μA ③
BAT
UVLO
=40mA
=40mA
BAT
）
- 8 18
×0.993 4.2 ×1.007 V
×0.99 4.2 ×1.01 V
μA ③
=L, CC mode 88 95 100 mA
=H, CC mode 440 475 500 mA
=4.2V - - 2.5
BAT
μA ③
μA ③
μA ③
=L ）
=H ）
7.5 9.5 12.0 mA
37.5 47.5 60.0 mA
Ta =2 5℃
-
②
③
③
③
③
Trickle Voltage V
Trickle Voltage
Hysteresis Width
UVLO Voltage V
UVLO Hysteresis Width V
VIN-V
BAT
Shut-down Voltage
VIN-V
Shut-down Voltage
BAT
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 RON - 300 450 800 mΩ
Soft-Start Time tSS I
Recharge Battery Time t
Battery Termination
Detect Time
LIM Pin "H" Level Voltage V
LIM Pin "L" Level Voltage V
LIM Pin "H" Level Current I
LIM Pin "L" Level Current I
Thermal Shut-Down
Detect Temperature
Thermal Shut-Down
Release Temperature
Unless otherwise stated, VIN=5.0V.
(*1) The figures under the condition of 0
(*2) V
is a voltage to start recharging while reducing V
RECHRG
V
TRIKL
V
TRIKL_HYS
UVLO_HYS
V
ASD_HYS
I
I
V
ΔV
RECHRG
V
V
UVLO
- 150 190 280 mV
V
V
ASD
- 50 70 90 mV
I
TERM
V
/CHG1
V
/CHG2
I
/CHG
V
RECHRG
V
t
I
TERM
1 V
LIM_H
0.4 V
LIM_L
-0.1 0.1
LIM_H
-0.1 0.1
LIM_L
T
Junction temperature 120
TSD
T
Junction temperature 100
TSR
O
C≦Ta≦50OC are guaranteed by design calculation.
BAT
=L, V
LIM
=4.3V, V
BAT
=4.0V, V
BAT
FLOAT1-VRECHRG
= 0 → I
BAT
BAT
Rising 2.813 2.9 2.987 V
BAT
=L 58 90 116 mV
LIM
: L → H 3.686 3.8 3.914 V
IN
: L → H 70 100 140 mV
IN
V
=L 0.07 0.1 0.13 mA/mA
LIM
V
=H 0.07 0.1 0.13 mA/mA
LIM
/CHG
/CHG
=5mA - 0.35 0.60 V
/CHG
BAT2(VLIM
: H → L 0.4 1.7 3.2 ms
falling (Less than I
in stand-by mode from the full charge.
BAT
=5V 8 20 35
=1V 4 10 18 mA
(*2)
100 150 200 mV
=H) 120 150 180
) 0.3 1.2 2.4 ms
TERM
③
③
⑥
-
③
-
②
②
μA ③
③
④
③
①
μs ⑤
⑥
⑥
③
③
μA ①
μA ①
℃ -
℃ -
4/19
Maintaini
Maintaini
)
≦
XC6801
Series
■OPERATIONAL DESCRIPTION
Constant-Current Charge (CC)
Constant-Voltage Charge (CV)
V
V
Charge Termination
<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
”H” level input：475mA（TYP.）
L
IM
L
”L” level input：95mA（TYP.）
IM
<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
the comparator sees that the I
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.
Charge Cycle
(Charge Main Routine)
Trickle Charge
V
>2.9V
BAT
-“L” I
I
LIM
BAT
BAT1
-“H” I
≦
I
LIM
BAT
BAT2
during a charge termin ation
detect time (1.2ms)
(Stand-by mode)
V
≦
4.05V
BAT
during a recharge time (1.7ms)
V
≦
2.9V
BAT
/10
/10
ng the charge state
ng the stand-by mode
Failure Detection
Input Voltage Monitor (UVLO) VIN-BAT Voltage Monitor (UVLO)
Shut-Down Shut-Down
VIN≧
3.8V
Charge Cycle Charge Cycle
VIN≧
3.61V
pin.
IM
pin voltage to detect the charge termination. When
pin voltage is less than 1.2ms (charge termination detect time), the IC enters stand-by mode.
SEN
SEN
△
(VIN-V
△(VIN-V
BAT
BAT
)>0.1V
<0.03V
No
Yes
5/19
XC6801 Series
■OPERATIONAL EXPLANATION (Continued)
<Charge Condition Status>
The /CHG pin constantly monitors the charge states classified as below:
●Strong pull-down: I
●Weak pull-down: I
●High impedance: in shutdown mode.
<Connection of Shorted BAT Pin>
Even if the BAT pin is shorted to V
current.
<Under-voltage Lockout (UVLO)>
The UVLO circuit keeps the charger in shut-down mode until the input voltage, V
in order to protect the battery charger, the UVLO circuit keeps the charger in shut-down mode when the voltage between the
input pin voltage and BAT pin voltage falls to less than 30mV. The charge will not restart until the voltage between the input pin
voltage and BAT pin voltage rises more than 100mV. During shut-down mode, the driver transistor turns off but a failure
detection circuit operates, and supply current is reduced to 8μA.
<Soft-Start Function>
To protect against inrush current from the input to the battery, soft-start time is optimized and internally set (150μs, TYP.).
<Backflow Prevention Between the BAT Pin and the V
A backflow prevention circuit protects against current flowing from the BAT pin to the V
higher than the V
IN
=10mA (TYP.) in a charge cycle,
/CHG
=20μA (TYP.) in a stand-by mode,
/CHG
, a trickle charge mode operates in order to protect the IC from destruction caused by over
SS
pin voltage.
Pin>
IN
, rises above the UVLO voltage. Moreover,
IN
pin even if the BAT pin voltage is
IN
6/19
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