Torex XC6802 Series User manual

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XC6802Series
Constant Voltage, Constant Current Linear Charger IC
for Single Cell Lithium-ion Battery Charge Control
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GENERAL DESCRIPTION
The XC6802 series is a constant-current/constant-voltage linear charger IC for single cell lithium-ion batteries. Internally the
XC6802 series includes reference voltage source, battery voltage monitor, driver transistor, constant-current (CC)/
constant-voltage (CV) charge circuit, over heat protection circuit, phase compensation circuit, etc. 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 charge to a battery is possible because approximately 1/10 out of setting charge current is supplied to the
battery. With an external RSEN resistor, the charge current can be set freely up to 800mA (MAX.), therefore, the series is ideal
for various battery charge applications. The series’ charge status output pin, /CHG pin, is capable of checking the IC’s
charging state while connecting with an external LED.
■
A
PPLICATIONS
●Charging docks and stationary chargers
●MP3 players, portable audio players
●Cellular phones, PDAs
●Bluetooth applications
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
FEATURES
Operating Voltage Range : 4.25V ~ 6.0V
Charge Current : Externally setup up to 800mA
(MAX.)
Charge Termination Voltage : 4.2V ±0.7%
Trickle Charge Voltage : 2.9V ±3%
Supply Current (Stand-by) : 10μA (TYP.)
Packages : SOT-89-5, SOT-25, USP-6C
Constant-current/constant-voltage operation
with thermal regulation
Automatic recharge
Charge status output pin
Soft-start function (Inrush limit current)
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TYPICAL APPLICATION CIRCUIT
Preliminary
ETR2501-002
■TYPICAL PERFORMANCE
CHARACTERISTICS
●Battery Charge Cycle
Li-ion Battery Charge Cycle
0
100
200
300
400
500
600
700
0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
Time (hours)
Charge Current I
BAT
(mA)
3.00
3.20
3.40
3.60
3.80
4.00
4.20
4.40
Battery Voltage V
BAT
(V)
VIN=5.0V, CIN=1uF
RSEN=2kohm
,
830mAh Batter
y
Charge Current
Battery Voltage
VIN=5.0V, CIN=1uF
RSEN=2Ω, 830mAh Batter
y
Li-ion Battery Charge Cycle
Batter
y
Volta
g
e
Charge Current
Charge Current : IBAT (mA)
Battery Voltage : VBAT (V)
Time
(
hou
r
)

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XC6802 Series
PIN NUMBER
SOT-25 SOT-89-5 USP-6C PIN NAME FUNCTION
1 5 3 /CHG Charge Status Output Pin
2 2 2 VSS Ground
3 4 1 BAT Charge Current Output Pin
4 3 6 VIN Input Voltage Pin
5 1 4 ISEN Charge Current Setup Pin
- - 5 NC No Connection
DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION
M : SOT-25
P : SOT-89-5
①Packages
E : USP-6C
R : Embossed tape, standard feed
②Device Orientation L : Embossed tape, reverse feed
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PIN CONFIGURATION
■
PIN ASSIGNMENT
■

PRODUCT CLASSIFICATION
●Ordering Information
XC6802A42x①②
SOT-89-5
(TOP VIEW)
* 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 VSS (No. 2) pin.
SOT-25
(TOP VIEW)
USP-6C
(BOTTOM VIEW)

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XC6802
Series
PARAMETER SYMBOL RATINGS UNIT
VIN Pin Voltage VIN V
SS –0.3 ~ + 6.5 V
ISEN Pin Voltage VSEN V
SS –0.3 ~ VIN + 0.3 V
BAT Pin Voltage VBAT V
SS –0.3 ~ + 6.5 V
/CHG Pin Voltage V/CHG V
SS –0.3 ~ + 6.5 V
BAT Pin Current IBAT 900 mA
SOT-25 250
SOT-89-5 500
Power Dissipation
USP-6C
Pd
100
mW
Operating Temperature Range Topr - 40 ~ + 85 ℃
Storage Temperature Range Tstg - 55 ~ + 125 ℃
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BLOCK DIAGRAM
■
A
BSOLUTE MAXIMUM R
A
TINGS
Ta=25℃

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XC6802 Series
Ta=25℃
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT CIRCUIT
Input Voltage VIN 4.25 - 6.0 V -
Supply Current ISS Charge mode, RSEN=10kΩ- 30 - uA -
Stand-by Current IStby Stand-by mode - 10 - uA -
Shut-down Current IShut Shut-down mode
(RSEN=NC, VIN<VBAT or VIN<VUVLO）- 5 - uA -
Float Voltage 1 VFLOAT1 TA=25℃, IBAT=40mA ×0.993 4.2 ×1.007 V -
Float Voltage 2 (*1) VFLOAT2 0℃≦TA≦50℃, IBAT=40mA ×0.99 4.2 ×1.01 V -
Battery Current 1 IBAT1 R
SEN=10kΩ, CC mode - 100 - mA -
Battery Current 2 IBAT2 R
SEN=2kΩ, CC mode - 500 - mA -
Battery Current 3 IBAT3 Stand-by mode, VBAT=4.2V - - -2.5 uA -
Battery Current 4 IBAT4 Shut-down mode (RSEN=NC) - - 2.0 uA -
Battery Current 5 IBAT5 Sleep mode, VIN=0V - - 2.0 uA -
Trickle Charge Current ITRIKL V
BAT<VTRIKL, RSEN=2kΩ- 50 - mA -
Trickle Voltage VTRIKL R
SEN=10kΩ, VBAT Rising - 2.9 - V -
Trickle Voltage
Hysteresis Range VTRIKL_HYS RSEN=10kΩ-
VTRIKL
×0.03 - mV -
UVLO Volatge VUVLO ＶIN: L →H - 3.8 - V -
UVLO Hysteresis Range VUVLO_HYS - -
VUVLO
×0.05 - mV -
Shut-down Voltage VSD I
SEN: L →H - 1.3 - V -
Shut-down Voltage
Hysteresis Range VSD_HYS - - 100 - mV -
VIN-VBAT
Shut-down Release Voltage VASD ＶIN: L →H - 100 - mV -
VIN-VBAT Shut-down Voltage
Hysteresis Range VASD_HYS - - 70 - mV -
C/10 Charge Termination
Current Threshold 1 ITERM1 R
SEN=10kΩ- 0.10 - mA/mA -
C/10 Charge Termination
Current Threshold 2 ITERM2 R
SEN=2kΩ- 0.10 - mA/mA -
ISEN Pin Voltage VISEN R
SEN=10kΩ, CC mode - 1.0 - V -
/CHG Pin
Weak Pull-Down Current I/CHG1 V
BAT=4.3, V/CHG=5V - 20 - uA -
/CHG Pin
Strong Pull-Down Current I/CHG2 V
BAT=4.0V, V/CHG=1V - 10 - mA -
/CHG Pin
Output LOW Voltage
V/CHG I/CHG＝5mA - 0.35 - V -
Recharge Battery
Threshold Voltage ΔVRECHRG V
FLOAT1-VRECHRG - 150 - mV -
ON Resistance RON - - 600 - mΩ-
Soft-Start Time tSS - 100 - us -
Recharge Battery Time tRECHRG - 2 - ms -
Battery Termination
Detect Time tTERM IBAT falling (less than charge current /10) - 1 - ms -
Current Sense Pin
Pull-Up Curernt ISEN_pull_up - - 3 - uA -
Thermal Shut-Don
Detect Temperature TTSD Junction temperature - 115 - ℃-
Thermal Shut-Down
Release Temperature TTSR Junction temperature - 95 - ℃-
* Unless otherwise stated, VIN=5.0V.
NOTE: *1: The condition, 0OC≦TA≦50OC, is a R&D guaranteed rating.
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ELECTRICAL CHARACTERISTICS
XC6802A42x

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XC6802
Series
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OPERATIONAL DESCRIPTION (Continued)
<Charge Cycle>
If the BAT pin voltage is less than 2.9V, the charger enters trickle charge mode. In this mode, a safe charge to a battery is
possible because approximately 1/10 of charge current which was set by the ISEN pin is supplied to the battery. When the BAT
pin voltage rises more than 2.9V, the charger enters constant-current mode (CC mode) and the battery is charged by the
programmed charge current. When the BAT pin voltage comes to 4.2V, the charger enters constant-voltage mode (CV mode)
automatically. After this, the charge current drops to 1/10 of the programmed charge current and the charge terminates.
<Setting Charge Current>
The charge current can be set by connecting a resistor between the ISEN pin and the VSS pin. The battery charge current, IBAT,
is 1000 times the current out of the ISEN pin current, therefore, the charge current, IBAT, is calculated by the following equations:
IBAT = (VISEN / RSEN) x 1000 (VISEN = 1.0V: Current sense pin voltage)
Use of external components with high accuracy and good temperature characteristics is recommended.
<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 ISEN pin voltage to detect the charge termination. When
the comparator monitors the ISEN pin voltage is less than 100mV (charge termination detect) for 1ms (charge termination detect
time), the IC enters stand-by mode. A driver transistor turns off during the stand-by mode. In this state, a failure detection
circuit and a monitoring circuit of the battery pin voltage operates and supply current is reduced to 10μA.
<Automatic Recharge>
The charge cycle resumes when the battery voltage falls and the battery pin voltage becomes less than 4.05V again during the
stand-by mode with 2ms recharge time. For this, the battery does not need any external activation control.

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XC6802 Series
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OPERATIONAL EXPLANATION (Continued)
<Charge Condition Status>
The /CHG pin constantly monitors the charge states classified as below:
●Strong pull-down: I/CHG=10mA (TYP.) in a charge cycle,
●Weak pull-down: I/CHG=20μA (TYP.) in a stand-by mode,
●High impedance: in shutdown mode.
<Connection of Shorted BAT Pin>
Even if the BAT pin is shorted to the VSS, a trickle charge mode starts to operate for protecting the IC from destruction caused
by over current.
<Undervoltage Lockout (UVLO)>
The UVLO circuit keeps the charger in shut-down mode until the input voltage, VIN, rises more than the UVLO voltage.
Moreover, in order to protect the battery charger, the UVLO circuit keeps the charger in shut-down mode when a 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 the shut-down mode, the driver transistor
turns off but a failure detection circuit operates, and supply current is reduced to 5μA.
<Soft-Start Function>
To protect against inrush current from the input to the battery, soft-start time is set in the circuit optimally (100μsec, TYP.).
<Manual Shut-Down>
During the charge cycle, the IC can be shifted to the shut-down mode by floating the ISEN pin. For this, a drain current to the
battery is reduced to less than 2μA and a shut-down current of the IC is reduced to less than 5μA. A new charge cycle starts
when reconnecting the current sense resistor.
<Opened BAT Pin>
When the BAT pin is left open, the IC needs to be shut-down once after monitoring the CHG pin by a microprocessor etc and
keeping the ISEN pin in H level.
<Backflow Prevention Between the BAT Pin and the VIN Pin>
A backflow prevention circuit protects against current flowing from the BAT pin to the VIN pin even the BAT pin voltage is higher
than the VIN pin voltage.

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XC6802
Series
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PACKAGING INFORMATION
●SOT-25 ●SOT-89-5
●USP-6C
＜Package Dimensions＞
●USP-6C Recommended Pattern Layout
●USP-6C Recommended Metal Mask Design

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XC6802 Series
1. The products and product specifications contained herein are subject to change without
notice to improve performance characteristics. Consult us, or our representatives
before use, to confirm that the information in this catalog is up to date.
2. We assume no responsibility for any infringement of patents, patent rights, or other
rights arising from the use of any information and circuitry in this catalog.
3. Please ensure suitable shipping controls (including fail-safe designs and aging
protection) are in force for equipment employing products listed in this catalog.
4. The products in this catalog are not developed, designed, or approved for use with such
equipment whose failure of malfunction can be reasonably expected to directly
endanger the life of, or cause significant injury to, the user.
(e.g. Atomic energy; aerospace; transport; combustion and associated safety
equipment thereof.)
5. Please use the products listed in this catalog within the specified ranges.
Should you wish to use the products under conditions exceeding the specifications,
please consult us or our representatives.
6. We assume no responsibility for damage or loss due to abnormal use.
7. All rights reserved. No part of this catalog may be copied or reproduced without the
prior permission of Torex Semiconductor Ltd.