2A Switch-Mode Li-Ion Battery Charger

2A Switch-Mode Li-Ion Battery Charger
FP8202
2A Switch-Mode Li-Ion Battery Charger
General Description
The FP8202 is a highly integrated switch-mode Li-Ion Battery Charger. With few external
components, FP8202 is well suited for a wide range of portable applications. Charging current can be
programmed by an external current sensing resistor. With 600KHz switching frequency, FP8202 can
use of small external components. Other features include UVLO, automatic recharge, charge status
indicators and battery temperature monitor.
Features
Up to 2A Programmable Charge Current
No external MOSFET, Sense Resistor, or Blocking Diode Required
Switch-model Charger for single cell Li-Ion Batteries
Preset Charge Voltage with ±1% Accuracy
Automatic Recharge
2.9V Trickle Charge Voltage
C/10 Charge Termination
Thermal Protection
Charge Status Indicators for No Battery and Charge Failure Display
Applications
Portable Information Appliances
Charging Docks & Cradles
Cellular Phones & PDAs
Handheld Computers
Typical Application Circuit
CHRG
SOP-8L (EP)
DFN-10L (EP)
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
1/17
FP8202
2A Switch-Mode Li-Ion Battery Charger
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
2/17
FP8202
Function Block Diagram
CHRG
-
+
-
+
STDBY
Charge Status Indicators
CHRG (Red)
STDBY (Green)
In Charging
ON
OFF
Charge Termination
OFF
ON
UVLO, OverT, UnderT,
NoBat(with TEMP used)
OFF
OFF
Charge Status
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
3/17
FP8202
State Diagram
CHRG
STDBY
≥
CHRG
STDBY
≥
CHRG
STDBY
CHRG
STDBY
CHRG
STDBY
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
4/17
FP8202
Pin Descriptions
SOP-8L (EP)
TOP View
LX
8
1
VCC
GND
2
7
CHRG
VS
3
6
STDBY
VBAT
4
5
EN
Bottom View
Name
No. I / O
Description
LX
1
I
Switch node and inductor connection pin
GND
2
P
IC Ground
VS
3
I
Charge current-sense input
VBAT
4
P
Battery Voltage
EN
5
I
Enable Control
STDBY
6
O
Charge State Indicator2
CHRG
7
O
Charge State Indicator1
VCC
8
P
Supply Voltage
EP
9
P
Exposed PAD-Must connect to Ground
EP
DFN-10L (EP)
Name
No. I / O
Description
LX
1
I
Switch node and inductor connection pin
GND
2
P
IC Ground
VS
3
I
Charge current-sense input
VBAT
4
P
Battery Voltage
TEMP
5
I
Battery Temperature Detector
RTRICK
6
I
CC Charge Current Setting & Monitor
EN
7
I
Enable Control
STDBY
8
O
Charge State Indicator2
CHRG
9
O
Charge State Indicator1
VCC
10
P
Supply Voltage
EP
11
P
Exposed PAD-Must connect to Ground
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
5/17
FP8202
Marking Information
SOP-8L (EP)
DFN-10L (EP)
FP8202
Halogen Free
Lot Number
Internal ID
Per-Half Month
Year
Halogen Free: Halogen free product indicator
Lot Number: Wafer lot number’s last two digits
For Example: 132386TB 86
Internal ID: Internal Identification Code
Per-Half Month: Production period indicated in half month time unit
For Example: January → A (Front Half Month), B (Last Half Month)
February → C (Front Half Month), D (Last Half Month)
Year: Production year’s last digit
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
6/17
FP8202
Ordering Information
Part Number
Operating Temperature
Package
MOQ
Description
FP8202XR-G1
-40°C ~ +85°C
SOP-8L(EP)
2500EA
Tape & Reel
FP8202dR-G1
-40°C ~ +85°C
DFN-10(EP)
2500EA
Tape & Reel
Absolute Maximum Ratings
Max.
Unit
-0.3
6
V
-0.3
6
V
IBAT
1.2
A
IPROG
1.2
mA
Junction Temperature
TJ
+150
°C
Storage Temperature
TS
+150
℃
Thermal Resistance (Junction to Ambient)
θJA
DFN-10L
65
℃/W
SOP-8L
50
℃/W
Thermal Resistance (Junction to Case)
θJC
DFN-10L
10
℃/W
SOP-8L
10
℃/W
+85
℃
+260
℃
Parameter
Supply Voltage
Symbol
Conditions
Vcc
All Other Pins
BAT pin Current
PROG pin Current
Min.
-65
Operating Temperature
-40
Lead Temperature (soldering, 10 sec)
Typ.
Suggested IR Re-flow Soldering Curve
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
7/17
FP8202
Recommended Operating Conditions
Parameter
Supply Voltage
Symbol
Conditions
Vcc
Operating Temperature
Min.
Max.
Unit
4.35
5.5
V
-40
85
°C
Typ.
Max.
Unit
55
100
µA
55
100
µA
Ambient Temperature
Typ.
DC Electrical Characteristics (Vcc=5V, TA= 25°C, unless otherwise noted)
Parameter
Standby Current
Symbol
ISB
Shutdown Supply Current
IST
CV Output (Float) Voltage
VFLOAT
BAT pin Current
IBAT
Test Conditions
Charge Termination
VCC < VBAT , VCC< VUVLO
RPROG not connect
0℃<TA<85℃
4.158
4.2
4.242
V
RSense=0.05Ω
1800
2000
2200
mA
RSense =0.1Ω
900
1000
1100
mA
RSense =0.2Ω
450
500
550
mA
Standby-Mode, VBAT=4.2V
0
-2.5
-6
µA
Shutdown-Mode,
±4
±6
µA
Sleep-Mode, VCC=0V
-4
-6
µA
200
Trickle Charge Current
ITRIKL
VBAT< VTRIKL , RSense=0.05Ω
Trickle Charge Threshold Voltage
VTRIKL
RSense =0.1Ω, VBAT Rising
Trickle Charge Hysteresis Voltage
VTRKHYS
RSense =0.1Ω
VUV
Vcc Rising
VCC Under Voltage Lockout Threshold
VCC Under Voltage Lockout Threshold
Hysteresis
Min.
2.8
VASD
PMOSFET On Resistance
RON
C/10 Termination Current Threshold
ITERM
Switching Frequency
Fsw
Max. Duty
DMAX
Min. Duty
DMIN
3.0
V
200
3.5
VUVHYS
VCC-VBAT Lockout Threshold
2.9
mA
3.7
mV
3.9
V
500
mV
Vcc Rising
250
mV
Vcc Falling
100
mV
260
mΩ
RSense =0.1Ω
100
mA
RSense=0.05Ω
200
mA
500
600
700
100
KHz
%
0
%
CHRGB pin Output Low Voltage
VCHRG
ICHRG=5mA
0.3
0.6
V
STDBYB pin Output Low Voltage
VSTDBY
ISTDBY=5mA
0.3
0.6
V
VRECHRG
VFLOAT-VRECHRG
150
mV
TLIM
145
°C
TEMP pin High Threshold Voltage
VTEMP-H
80
%
TEMP pin Low Threshold Voltage
VTEMP-L
45
%
20
µs
Battery Recharge Threshold Voltage
Thermal Shutdown
Soft-Start Time
Recharge Comparator Filter Time
C/10Termination Comparator Filter Time
TSS
IBAT=0 to IBAT=0.1V/RS
TRECHRG
VBAT High to Low
0.8
1.8
4
mS
TTERM
IBAT Falling below ITERM
0.8
1.8
4
mS
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
8/17
FP8202
Function Description
Operation
The FP8202 is a switch-mode battery charger designed primarily for charging single cell
lithium-ion batteries. The charger uses a constant-current/constant-voltage charge algorithm with
programmable current. Charging current can be programmed externally with a single current sensing
resistor between the VS pin and the BAT pin. The final battery float voltage is internally set to 4.2V.
Normal Charge Cycle
A charge cycle begins when the voltage at the VCC pin rises above the UVLO threshold. If the
BAT pin voltage is smaller than 2.9V, the charger enter trickle charge mode. In this mode, the FP8202
supplies approximately 1/10 the programmed charging current to bring the battery voltage up to a safe
level for full current charging. When the BAT pin voltage rises above 2.9V, the charger enters
constant-current mode, where the full programmed charge current is supplied to the battery. When the
BAT pin voltage approaches 4V, the FP8202 enters the constant-voltage mode and the charge current
begins to decrease. When the charge current drops to 1/10 of the programmed value, the charge cycle
ends.
Programming Charge Current
When the battery voltage exceeds the trickle charge threshold, the charger goes into the full
scale constant current charge mode. In constant current mode, the charge current is set by the
external sense resistor RSENSE and an internal 100mV reference, The required resistor value can be
calculated from the charge current with following equation:
Rsense=
100mV
ICHG
Charge Termination
A charge cycle is terminated when the charge current falls to 1/10 the programmed value after
the final float voltage is reached. This condition is detected by using an internal filtered comparator to
monitor the sense voltage. When the voltage between the VS pin and the BAT pin falls below 10mV for
longer then TTERM (1.8ms), charging is terminated. The charge current is latched of and the FP8202
enters standby mode, where the input supply current drops to 55uA. The FP8202 draws no current
from the battery in standby mode. This feature reduces the charge and discharge cycles on the battery,
further prolonging the battery life.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
9/17
FP8202
Thermal Protection
FP8202 will shutdown automatically when the internal junction temperature reaches 140℃ to
protect both the part and the system.
Battery Temperature Fault Monitoring
In the event of a battery over-temperature condition, the charging control will turn off the
internal pass device and report a battery temperature fault on the TEMP pin. Inside the FP8202, two
internal voltage references VTEMP-H and VTEMP-L are fixed at 80% ×VCC and 45% ×VCC respectively. As
the TEMP pin voltage rises above VTEMP-H or falls below VTEMP-L, the FP8202 stops charging and
indicates a fault condition. After the system recovers from a temperature fault, the device will resume
charging operation. For applications that do not need to monitor the battery temperature, short the
TEMP pin to the GND.
The values of R1 and R2 are set according to the battery temperature range and the value of
thermal sensitive resistor. If the battery is equipped with NTC(Negative Temperature Coefficient)
thermistor and the temperature monitor range is TL~TH(TL< TH), then RT, the thermistor resistance,
decreases as temperature increases from TL to TH, means RTL>RTH.
The TEMP pin voltage can be calculated as:
VTEMP =
R2 // RT
× Vcc
R1 + R2 // RT
Thus, this VTEMP decreases as the temperature increase from TL to TH.
To set proper R1 and R2 value for temperature protection, we set:
0.8×Vcc= VTEMPH=
R2 // RTL
× Vcc at TL
R1 + R2 // RTL
0.45×Vcc= VTEMPL=
R2 // RTH
× Vcc at TH
R1 + R2 // RTH
Where RTL and RTH are the thermistor resistances at TL and TH respectively.
So R1 and R2 can be derived as following:
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
10/17
FP8202
R1=
RTL RTH (K 2 - K1)
RTL RTH × 35
=
(RTL - RTH) K1 K 2 (RTL - RTH) × 36
R2=
RTL RTH (K 2 - K1)
RTL RTH × 35
=
RTL(K1 - K1 K 2) - RTH(K 2 - K1 K 2) RTL × 9 - RTH × 44
where K1=0.45 and K2=0.8
Under Voltage Lockout (UVLO)
An internal under voltage lockout circuit monitors the input voltage and keeps the charger in
shutdown mode until Vcc rises above the under voltage lockout threshold. The UVLO circuit has a
built-in hysteresis of 500mV. Furthermore, to protect against reverse current in the power MOSFET, the
UVLO circuit keeps the charge in shutdown mode if Vcc falls to within 100mV of the battery voltage, If
the UVLO comparator is tripped, the charger will not come out of shutdown mode until Vcc rises
250mV above the battery voltage.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
11/17
FP8202
Manual shutdown
At any point in the charge cycle, the FP8202 can be put into shutdown mode when put the EN pin
to the low-level voltage. This reduces the battery drain current to about to 2uA and the supply current to
less than 55uA.
Automatic Recharge
Once the charge cycle is terminated, the FP8202 continuously monitors the voltage on the BAT
pin using a comparator with a 1.8ms filter time (TRECHARGE). A charge cycle restarts when the battery
voltage falls below 4.05V (which corresponds to approximately 80% to 90% battery capacity).This
ensures that the battery is kept at or near a fully charged condition and eliminated the need for periodic
charge cycle initiations. CHRG output enters a strong pull-down state during recharge cycles.
Programming Trickle Charge Current
If the battery voltage is below the trickle charge threshold, the FP8202 delivers a small current
to charge the battery until the battery voltage reaches the fast charge threshold value. the trickle
charge current is set by the external resistor RTRICK. For applications that do not need to set the trickle
charge current, short the RTRICK pin to the GND. The FP8202 supplies approximately 1/10 the
programmed charging current to bring the battery voltage up to a safe level. The trickle charge current
value can be calculated with following equation:
ITRICK =
40 k + Rtrick
x ICHG
400 k + Rtrick
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
12/17
FP8202
Application Information
Inductor Selection
Inductance value is decided based on different condition. 3.3uH to 4.7µH inductance value is
recommended for general application circuit. There are three important inductor specifications, DC
resistance, saturation current and core loss. Low DC resistance has better power efficiency.
Capacitor Selection
Use Low ESR capacitors are preferred to reduce the input inrush voltage, Ceramic capacitor of
X5R and X7R are recommended, which have low equivalent series resistance (ESR) and wider
operation temperature range.
Diode Selection
Schottky diodes with fast recovery times and low forward voltages are recommended. Ensure the
diode average and peak current rating exceed the average output current and peak inductor current. In
addition, the diode’s reverse breakdown voltage must exceed the Vcc voltage.
Layout Considerations
1. The power traces, consisting of the GND trace, the LX trace and the battery trace should be kept
short,direct and wide.
2. Layout switching node LX, inductor and diode connection traces wide and short to reduce EMI.
3. Place CIN nearby VCC pin as closely as possible to maintain input voltage steady and filter out the
pulsing input current.
4. The GND of the CIN and Schottky should be connected close together and directly to a ground
plane.
5. Place RSENSE nearby BAT pin and VS pin.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
13/17
FP8202
SOP-8L (EP) Suggested Layout
DFN-10L (EP) Suggested Layout
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
14/17
FP8202
Typical Application
CHRG
SOP-8L (EP)
VIN
+
R2
1k
C1
10uF/X5R
VCC
R1
10k
LX
10
1
L1
4.7uH
EN
VS
7
3
C3
FP8202
4.7uF
+
RS
0.05
SM340A
VBAT
9
CHRG
BAT+
4
C2
8
D1
STDBY
+
10uF
NTC
6
RTRICK
GND
TEMP
5
2
LI-Ion
DFN-10L (EP)
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
15/17
FP8202
Package Outline
SOP-8L (EP)
Symbols
Min. (mm)
Max. (mm)
A
1.346
1.752
A1
0.050
0.152
A2
1.498
D
4.800
4.978
E
3.810
3.987
H
5.791
6.197
L
0.406
1.270
θ°
0°
8°
Exposed PAD Dimensions:
Symbols
Min. (mm)
Max. (mm)
E1
2.184 REF
D1
2.971 REF
Note:
1. JEDEC Outline : N/A
2. Dimensions “D” does not include mold flash, protrusions or gate burrs mold flash
3. Protrusions and gate burrs shall not exceed .15mm (.006in) per side.
Dimensions “E” does not include inter-lead flash or protrusions inter-lead flash and protrusions
4. Shall not exceed 25mm (.010in) per side.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
16/17
FP8202
DFN-10L (EP)
m
Unit: mm
Symbols
Min. (mm)
Max. (mm)
A
0.700
0.800
A1
0.000
0.050
A3
b
0.20REF
0.180
0.300
D
3.00
E
3.00
D2
2.200
2.700
E2
1.400
1.750
e
0.500
L
0.300
K
0.200
0.500
Note:
1. JEDEC Outline :N/A
2. Dimensions “D” does not include mold flash, protrusions or gate burrs mold flash
3. Protrusions and gate burrs shall not exceed .15mm (.006in) per side.
Dimensions “E” does not include inter-lead flash or protrusions inter-lead flash and protrusions
4. Shall not exceed 25mm (.010in) per side.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.61
17/17
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