XT9502
XT9502
Linear Li-Ion Battery Charger
■ General Description
■ Applications
XT9502 series is a double lithium battery charge

Digital camera
management chip. The chip includes a charge state

PDAS
detection, the charging process,temperature detection and

The phone lithium battery
so on . The chip also integrates a high-precision reference
■ Features
voltage module in it. It uses the SOP-8 package.
XT9502 charge contains three modes: precharge,constant

Double lithium battery charge management
current
charging.Constant

Only need a few external compenents
current charging current is five times the pre-charge

Pre-charge, constant current charging , constant
charging,constant
voltage
current; when the voltage is lower than 6.5V into the
voltage charging mode
precharge mode; when the voltage is above 6.5V into the

Temperature detection
conatant current charge mode, the charging current is five

Two charging status
times as the precharge, the charging current is dertermined

SOP-8 Package
by an external resistor.
■ Package
 SOP-8
■ Ordering Information
XT9502 ①②③④⑤⑥
Designator
Symbol
①
A
Description
Voltage accuracy: ±1%
BATT voltage central value:
②③④
Eg: ②=8 ③=0 ④=0 represent:8.00V
800-860
②=8 ③=4 ④=0 represent:8.40V
⑤
⑥
■
S
Package: SOP-8
R
Embossed tape: Standard feed
L
Embossed tape: Reverse feed
Pin Assignment
CS
1
8
BATT
DONE
2
7
VT
CHRG
3
6
GND
VDD
4
5
DRC
SOP-8
(Top View)
Rev.1.0 —July.16, 2012
Pin Number
Pin Name
1
CS
2
DONE
Charge status pin1
3
CHRG
Charge status pin2
4
VDD
Power input
5
DRC
External MOS or PNP control pin
6
GND
Ground
7
VT
8
BATT
1
Function Description
Overcharge detection pin
Battery temperature detection pin
Battery voltage detection
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XT9502
■ Marking Rule

SOP-8
XT9502
① ② ③ ④
XXXX
①②③ Represents the BATT central voltage value
Symbol
Voltage
Product Name
780
7.80V
XT9502*780**
800
8.00V
XT9502*800**
820
8.20V
XT9502*820**
840
8.40V
XT9502*840**
860
8.60V
XT9502*860**
880
8.80V
XT9502*880**
④ Represents the voltage accuracy
Symbol
Voltage Accuracy
Product Name
A
±1%
XT9502***A**
B
±2%
XT9502***B**
XXXX represents the production batch
Rev.1.0 —July.16, 2012
2
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XT9502
■ Block Diagram
Rev.1.0 —July.16, 2012
3
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XT9502
■ Absolute Maximum Ratings
Parameter
Symbol
Maximum Rating
Input Supply Voltage
VDD
VSS-0.3~VSS+18
DRC pin Voltage
Vdrc
VSS-0.3~Vcc+18
BAT pin Voltage
Vbat
Vss-0.3~12
CS pin Voltage
Vcs
Vss-0.3~6
CHAG pin Voltage
Vchrg
VSS-0.3~18
DONE pin Voltage
Vdone
Vss-0.3~18
NTC pin Voltage
Vntc
Vss-0.3~6
Operating Ambient Temperature
Topa
-40~+85
Storage Temperature
Tstr
-65~+125
Unit
V
°C
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage.
These values must therefore not be exceeded under any conditions.
■ Electrical Characteristics
(Ta=25℃ unless specified)
Parameter
Symbol
Condition
Operating current 1
IDD(OPE)
Input current 2
IDD(SLP)
Min
Typ
Max
Unit
9V<VDD<20V
350
µA
VDD<7.5
20
µA
VBATT pin voltage
Vbatt
8.27
8.36
8.45
V
Constant current charging current
Iconst
90/Rs
100/Rs
110/Rs
mA
Ipre
18/Rs
20/Rs
22/Rs
mA
Precharge threshold voltage
VO(min)
6.2
6.5
6.8
V
Recharge threshold voltage
VO(RCH)
Trickle charge current
mV
-400
VT high temperature shutdown voltage
VT-hot
45
50
55
mV
VT low temperature shutdown voltage
VT-cold
1800
2000
2200
mV
Low power lockout threshold voltage
Rev.1.0 —July.16, 2012
Vuvlo
7.5
4
V
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XT9502
■ Typical Application Circuit
LN2311
VDD
D1
VDD
R2
100
C2
10uF
4.7K
绿色
LED
VDD
1
CS
2
BATT
8
DONE
VT
7
3
CHRG
GND
6
4
VDD
DRC
5
R1
200
VDD
10K
4.7K
红色
C1
10uF
LED
Rs
0.39R
Note: D1 is a Schottky; RS has been suggested that high-precision ( 1% ) in order to ensure current accuracy, R1 and R2 is not
required precision.
■ Typical Performance Characteristics
Charging process description
Rev.1.0 —July.16, 2012
5
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XT9502
■ Function Description
When the input voltage VDD is below the UVLO level, the chip will enter into the SLEEP MODE, the chip power consumption
will down to 20μA; When the VDD pin voltage rises above the UVLO voltage or more, the chip will into the CHRG the MODE, a
charge cycle begins, early in the charge cycle, if the battery voltage is lower than the trickle charge threshold voltage (6.5V) the
charger goes into trickle charge mode. The trickle charge current is internally set to 20% of the maximum charging current.
When the battery voltage exceeds the trickle charge threshold, the charger enters constant current charging mode, the charging
current from the internal 100mv baseline and the external sense resistor to a decision.
I BATT 
100 mV
RS
The chip also with battery temperature detection function, this function through the VT side, and in VT termination of a
negative temperature coefficient 10KΩ thermistor (DALE NTHS1206N02), as the temperature rises to 80 degrees, the pin
voltage is 50mV for low temperature to reach -30 degrees, the point voltage of 2V, only there voltage in the range of the two
voltage values, the chip in order to work properly, otherwise the charge is stopped, the LED is not lit, this pin can be directly
connected to shield of the temperature detection. Charging status display in the table below:
High current
Fully
NTC is not in the
charging
charged
scope of state
Off
Off
On
Off
On
On
Off
Off
No-load
Trickle charge
Done(Green)
Flicker
Charge(Red)
Off
Rev.1.0 —July.16, 2012
6
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XT9502
■ Package Information

SOP-8
Rev.1.0 —July.16, 2012
7
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