TOREX XC6802 User Manual

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XC6802 Series

ETR2501-006

800mA Single Cell Li-ion Battery Linear Charger IC

GENERAL DESCRIPTION

The XC6802 series is a constant-current/constant-voltage linear charger IC for single cell lithium-ion batteries. The XC6802

includes a reference voltage source, battery voltage monitor, driver transistor, constant-current/constant-voltage charge circuit,

over heat protection circuit, 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 charge to a battery is possible

because approximately 1/10 out of setting charge current is supplied to the battery. With an external R

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.

PPLICATIONS

● 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 up to 800mA (MAX.)

Charge Termination Voltage : 4.2V ±0.7%
Trickle Charge Voltage : 2.9V ±3%
Supply Current (Stand-by) : 15μA (TYP.)

Function :

Constant-current/constant-voltage Operation

Thermal Shutdown

Automatic Recharge

Charge Status Output Pin

Operating Ambient Temperature

Packages :

Soft-start Function (Inrush Limit Current)

: -40℃〜+85℃

SOT-89-5, SOT-25, USP-6C, USP-6EL

Environmentally Friendly : EU RoHS Compliant, Pb Free

■TYPICAL PERFORMANCE

CHARACTERISTICS

●Battery Charge Cycle

Li-ion Battery Charge Cycle

Li-ion Battery Charge Cycle

700

600

500

(mA)

(mA)

BAT

BAT

400

300

200

Charge Current I

Charge Current : I

100

0

0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00

RSEN=2kΩ, 830mAh Battery

Battery Voltage

Battery Voltage

Charge Current

Charge Current

Time (h ours)

Time (hour)

resistor, the charge

SEN

VIN=5.0V, CIN=1μF

VIN=5 .0V, CIN=1 uF

RSEN =2ko hm

830mAh Batter

4.40

4.20

4.00

3.80

3.60

3.40

3.20

3.00

(V)

(V)

BAT

BAT

Battery Voltage V

Battery Voltage : V

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XC6802 Series

PIN CONFIGURATION

XC6802A42X

* For SOT-25, SOT-89-5, and USP-6C, charge current should be set to become I

●Ordering Information
XC6802A42X①②-③

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* The dissipation pad for the USP-6C / USP-6EL 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

(No. 2) pin.

SS

PIN ASSIGNMENT

PIN NUMBER

SOT-25 SOT-89-5 USP-6C

1 5 3

2 2 2

3 4 1

4 3 6

5 1 4

- - 5

USP-6EL

3

2

1

6

4

5

PIN NAME FUNCTIONS

/CHG Charge Status Output Pin

VSS Ground

BAT Charge Current Output Pin

VIN Input Voltage Pin

I

Charge Current Setup Pin

SEN

NC No Connection

FUNCTIONS

PIN NAME CONDITIONS IC OPERATION

I

SEN

For USP-6EL, charge current should be set to become I

H Level (1.4V≦V

Pull-down by external components ON, Charge Current I

SEN≦VIN

) or Open

OFF (Shutdown Mode)

≦500mA.

BAT

≦800mA.

BAT

=1000 / R

BAT

SEN

PRODUCT CLASSIFICATION

DESIGNATOR ITEM SYMBOL DESCRIPTION

PR SOT-89-5 (1,000/Reel)

PR-G SOT-89-5 (1,000/Reel)

MR SOT-25 (3,000/Reel)

①②-③

(*1)

The “-G” suffix denotes Halogen and Antimony free as well as being fully RoHS compliant.

(*1)

Packages (Order Unit)

MR-G SOT-25 (3,000/Reel)

ER USP-6C (3,000/Reel)

ER-G USP-6C (3,000/Reel)

4R-G USP-6EL (3,000/Reel)

*

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A

BLOCK DIAGRAM

* Diodes inside the circuits are ESD protection diodes and parasitic diodes.

BSOLUTE MAXIMUM RATINGS

PAR AMET ER SYMBOL RATINGS UNIT

VIN Pin Voltage VIN -0.3 ~ + 6.5 V

ISEN Pin Voltage VSEN -0.3 ~ VIN + 0.3 or +6.5

BAT Pin Voltage VBAT -0.3 ~ + 6.5 V

/CHG Pin Voltage V/CHG -0.3 ~ + 6.5 V

SOT-89-5

BAT Pin Current

(*1)

SOT-25

USP-6C

USP-6EL

SOT-89-5

IBAT

900

550

500

1300 (PCB mounted)

250

120

Power Dissipation

SOT-25

USP-6C

Pd

600 (PCB mounted)

1000 (PCB mounted)

USP-6EL

120

1000 (PCB mounted)

Operating Temperature Range Topr - 40 ~ + 85 ℃

Storage Temperature Range Tstg - 55 ~ + 125 ℃

All voltages are described based on the VSS pin.

(*1)

Please use within the range of I

(*2)

The maximum rating corresponds to the lowest value between VIN+0.3 or +6.5.

(*3)

This is a reference data taken by using the test board. Please refer to page 17 to 20 for details.

≦Pd/(VIN-V

BAT

BAT

).

Ta =2 5℃

(*2)

V

mA

(*3)

(*3)

(*3)

(*3)

mW

XC6802

Series

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XC6802 Series

ELECTRICAL CHARACTERISTICS

XC6802A42x

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT CIRCUIT

Input Voltage VIN 4.25 - 6.0 V -

Supply Current ISS Charge mode, R

Stand-by Current I

Shut-down Current I

Float Voltage 1 V

Float Voltage 2

Maximum Battery Current

(*1)

V

(*2)

I

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

Trickle Voltage V

Stand-by mode - 15 35

STBY

Shut-down mode

SHUT

FLOAT1

FLOAT2

BATMAX

TRIKL1

TRIKL2

(R

=NC, VIN<V

SEN

Ta =2 5 ℃, I
0℃≦Ta ≦50℃, I

SOT-25 / SOT-89-5 / USP-6C - - 800

USP-6EL - - 500

R

BAT1

R

BAT2

Stand-by mode, V

BAT3

Shut-down mode (R

BAT4

Sleep mode, VIN=0V - - 1

BAT5

V

V

R

TRIKL

=10kΩ, CC mode 93 100 107 mA

SEN

=2kΩ, CC mode 465 500 523 mA

SEN

BAT<VTRIKL, RSEN

BAT<VTRIKL, RSEN

=10kΩ, V

SEN

Ta =2 5 ℃

=10kΩ - 15 35

SEN

μA ③
μA ③

=40mA

BAT

or VIN<V

BAT

=40mA

BAT

UVLO

）

- 10 23

×0.993 4.2 ×1.007 V

×0.99 4.2 ×1.01 V -

μA ③

mA -

=4.2V - - 2

BAT

=NC) - - 1

SEN

μA ③
μA ⑤
μA ③

=10kΩ 6 10 14 mA

=2kΩ 30 50 70 mA

Rising 2.913 2.9 2.987 V

BAT

②

③
③

③
③
③

Trickle Voltage Hysteresis Width

V

TRIKL_HYS

UVLO Voltage V

UVLO Hysteresis Width V

UVLO_HYS

Manual Shut-down Voltage VSD I

Manual Shut-down Voltage

Hysteresis Width

VIN-V

BAT

Shut-down Release Voltage

VIN-V

Shut-down Voltage

BAT

Hysteresis Width

C/10 Charge Termination

Current Threshold 1

C/10 Charge Termination

Current Threshold 2

I

Pin Voltage V

SEN

/CHG Pin

Weak Pull-down Current

/CHG Pin

Strong Pull-down Current

/CHG Pin

Output Low Voltage

Recharge Battery Threshold Voltage

V

V

ASD_HYS

I

I

I

I

V

ΔV

SD_HYS

V

TERM1

TERM2

/CHG1

/CHG2

RECHRG

ON Resistance RON I

- 58 90 116 mV

Ｖ

UVLO

: L → H

IN

- 150 190 280 mV

: L → H 1.4 - - V

SEN

- - 100 - mV ①

ＶIN: L → H 70 100 140 mV ③

ASD

- - 70 - mV ③

R

R

R

ISEN

V

V

/CHG

=10kΩ 0.07 0.10 0.13 mA/mA ②

SEN

=2kΩ 0.07 0.10 0.13 mA/mA ②

SEN

=10kΩ, CC mode - 1.0 - V

SEN

=4.3, V

BAT

=4.0V, V

BAT

I

＝5mA

/CHG

V

FLOAT1-VRECHRG

=100mA - 450 900 mΩ

BAT

=5V 8 20 50

/CHG

=1V 4 10 20 mA

/CHG

100 150 200 mV

Soft-start Time tSS 100 150 200

Recharge Battery Time t

Battery Termination

Detect Time

I

Pin Pull-up Current I

SEN

Thermal Shut-down
Detect Temperature

Thermal Shut-down Release

Temperature

0.4 2 4 ms

RECHRG

t

I

TERM

SEN_pull_up

T

TSD

T

TSR

falling (less than charge current /10)

BAT

- - 1.3 -

Junction temperature - 115 -

Junction temperature - 95 -

* Unless otherwise stated, VIN=5.0V.

(*1)

The figures under the condition of 0

(*2)

The R

resistance set: The battery current shall not be exceeded to 800mA. (SOT-25, SOT-89-5, and USP-6C)

SEN

O

C≦Ta ≦50

O

C are guaranteed by design calculation.

The battery current shall not be exceeded to 500mA. (USP-6EL)

3.686 3.8 3.914 V

μA ③

- 0.35 0.7 V

μs ⑥

0.3 1 3.5 ms

μA ①

℃

℃

③
③

③
①

③

③

④

③
①

②
②

-

-

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XC6802

Series

OPERATIONAL EXPLANATION

Constant-Current Charge (CC)
Constant-Voltage Charge (CV)

<Charge Cycle>
If the BAT pin voltage is less than trickle voltage (TYP. 2.9V), the charger enters trickle charge mode. In this mode, a safe
battery charge is possible because approximately only 1/10 of the charge current which was set by the I
the battery. When the BAT pin voltage rises above the 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 by connecting a resistor between the I
is 1000 times the current out of the I

I

BAT

However I

<Charge Termination>
The battery charge is terminated when the charge current decreases to 1/10
voltage reaches a float voltage. An internal comparator monitors the I
the comparator monitors the I
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.

(*1)

The detect after charging completed: I

<Automatic Recharge>
In stand-by mode battery voltage falls. When the voltage level at the battery pin drops to recharge battery threshold voltage
(TYP. 4.05V) or less, the charge cycle automatically re-starts after a delay of (TYP. 2ms). As such, no external activation
control is needed.

Charge Cycle

(Charge Main Routine)

Trickle Charge

Yes

Keeping the charge state
during a charge termination
detect time (1ms)

Charge Termination

(Stand-by Mode)

Yes

Keeping the stand-by mode
during a recharge time
(2ms)

= (V

ISEN

/ R

BAT

Input Voltage Monitor (UVLO)

Charge Cycle Charge Cycle Charge Cycle

Shut-down Shut-down Shut-down

pin. Therefore, the charge current, I

SEN

) x 1000 (V

SEN

= 1.0V (TYP.): Current sense pin voltage)

ISEN

≦800mA (SOT-25, SOT-89-5, and USP-6C), I

pin voltage is less than 100mV (charge termination detect)

SEN

pin voltage should be less than 100mV.

SEN

Failure Detection

Manual Shut-down VIN-BAT Voltage Monitor

pin and the VSS pin. The battery charge current, I

SEN

BAT

≦500mA (USP-6EL)

BAT

pin voltage to detect the charge termination. When

SEN

pin, is supplied to

SEN

, is calculated by the following equations:

of the full charging level after the battery pin

(*1)

for 1ms TYP. (charge

5/21

BAT

,

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XC6802 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 the V
by over current.

<Under-voltage Lockout (UVLO)>
The UVLO circuit keeps the charger in shut-down mode until the input voltage, V
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 (TYP.). The charge will not restart until the voltage
between the input pin voltage and BAT pin voltage rises more than 100mV (TYP.). During the shut-down mode, the driver

transistor turns off but a failure detection circuit operates, and supply current is reduced to 10μA (TYP.).

<Soft-start Function>

To protect against inrush current from the input to the battery, soft-start time is set in the circuit optimally (150μs, TYP.).

<Manual Shut-down>
During the charge cycle, the IC can be shifted to the shut-down mode by floating the I

battery is reduced to less than 2μA and a shut-down current of the IC is reduced to less than 10μA (TYP.). 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 I

<Backflow Prevention Between the BAT Pin and the V
A backflow prevention circuit protects against current flowing from the BAT pin to the V
than the V

SEN

pin voltage.

IN

Charge

Current

Battery
Voltage

/CHG Pin

Status

=10mA (TYP.) in a charge cycle,

/CHG

=20μA (TYP.) in a stand-by mode,

/CHG

pin in H level.

CC CVTrickle Standby

Battery Termination Detect Time

(1ms, Typ)

Strong Pull Down

(10mA, Typ)

, a trickle charge mode starts to operate for protecting the IC from destruction caused

SS

Pin>

IN

Weak Pull Down

(20uA, Typ)

Recharge

Recharge Battery Time

Strong Pull Down

(10mA, Typ)

IN

IN

6/21

IBAT

IBAT/10

4.20V

4.05V

2.9V

(2ms, Typ)

, rises more than the UVLO voltage.

pin. For this, a drain current to the

SEN

pin even the BAT pin voltage is higher

XC6802

Series

■NOTES ON USE

1. For temporary, transitional voltage drop or voltage rising phenomenon, the IC is liable to malfunction should the ratings be
exceeded.

2. Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output current.
Please wire the C

3. Torex places an importance on improving our products and their reliability.

We request that users incorporate fail-safe designs and post-aging protection treatment when using Torex products in their
systems.

IN as close to the IC as possible.

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