1A Linear Li-ion Battery Charger

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FP8103

1A Linear Li-Ion Battery Charger in SOP8

General Description

The FP8103 is a standalone linear Li-ion battery charger with exposed pad SOP8 package. With few external components, FP8103 is well suited for a wide range of portable applications. Charging current can be programmed by an external resistor. In standby mode, supply current will be reduced to around 55uA. Other features include UVLO, automatic recharge, charge status indicators and thermal regulation.

Features

 Standalone Linear Charger for Single Cell Li-ion Batteries

 No External MOSFET, Sense Resistor, or Blocking Diode Required

 Up to 1A Programmable Charge Current

 Preset Charge Voltage with ±1% Accuracy

 Automatic Recharge

 2.9V Trickle Charge Voltage

 C/10 Charge Termination

 55uA Standby Supply Current

 Charge Status Indicators for No Battery and Charge Failure Display

 Soft-Start to Limit Inrush Current

 Thermal Protection

Applications

 Portable Information Appliances

 Charging Docks & Cradles

 Cellular Phones & PDAs

 Handheld Computers

Typical Application Circuit

V

IN

1

TEMP

EN

8

2

PROG

CHRG

3

GND

FP8103

STDBY

6

7

4

Vcc

BAT

5

Bat+

Bat-

Li-ion

CELL

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. 0.70

1/19

Function Block Diagram

STDBY CHRG

V cc

V

BAT

Body

Switcher

145°C

T

Die

-

+

80%Vcc -

+

TEMP

45%Vcc

-

+

2.9V

-

+

VBAT

4.15V

-

+

-

+

Charging

Control

+

-

+

0.1V

+

1.0V

Vcc

-

+

+

-

V

REF

Charge Status Indicators

Charge Status

In Charging

Charge Termination

UVLO, OverT, UnderT,

NoBat(with TEMP used)

CHRG

(Red)

ON

OFF

OFF

PROG

STDBY

(Green)

OFF

ON

OFF

FP8103

BAT

GND

EN

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. 0.70

2/19

State Diagram

V

BAT

Shutdown Mode

V cc

< V

UVLO or

V cc

< V

BAT

V cc

≥ V

UVLO and

V cc

≥ V

+0.1V

Check

V

BAT

V

BAT

< 2.9V

Pre-Charge Mode

Charge Current=1/10.I

BAT

V cc

< V

UVLO

V cc

< V

BAT or

V

BAT

Constant-Current Charge Mode

Charge Current=I

BAT

V cc

< V

UVLO

V cc

< V

BAT or

FP8103

V

BAT

> 4.15V

Constant-Voltage Charge Mode

Charge Voltage > 4.15V

V cc

< V

UVLO or

V cc

< V

BAT

Charge Current <1/10.I

BAT

V

BAT

< 4.15V

Standby Mode

Charge Termination

V cc

< V

UVLO or

V cc

< V

BAT

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. 0.70

3/19

FP8103

Pin Descriptions

SOP-8L (EP)

TOP View

TEMP

1 8

PROG

2

GND

3

Vcc

4

Bottom View

7

6

5

EN

CHRG

STDBY

BAT

Name No. I / O

TEMP 1

Description

I Battery Temperature Detector

PROG 2

GND 3

I CC Charge Current Setting & Monitor

P IC Ground

V cc

BAT

4

5

STDBY

6

CHRG

7

EN 8

EP 9

P Supply Voltage

P Battery Voltage

O Charge State Indicator2

O Charge State Indicator1

I Enable Control

P Exposed PAD-Must connect to Ground

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. 0.70

4/19

Marking Information

SOP-8L (EP)

FP8103

XXx-XXL

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 Lot : 123456 XXx-56L

Internal ID: Internal Identification Code

Per-Half Month: Production period indicator in half month time unit

For Example :

A → First Half Month of January

B → Second Half Month of January

C → First Half Month of February

D → Second Half Month of February

Year:

Production year’s last digit

FP8103

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. 0.70

5/19

FP8103

Ordering Information

Part Number Operating Temperature

FP8103XR-G1 -40°C ~ +85°C

Absolute Maximum Ratings

Parameter Symbol

Supply Voltage V cc

All Other Pins

Package

SOP-8L(EP)

Conditions Min.

-0.3

-0.3

MOQ

2500EA

Description

Tape & Reel

Typ. Max. Unit

6 V

6 V

-65

1.2

1.2

+150

+150

BAT Pin Current

PROG Pin Current

Junction Temperature

Storage Temperature

Thermal Resistance

I

BAT

I

PROG

T

J

T

S

θ

JA

θ

JC

SOP-8L(EP)

Operating Temperature

Lead Temperature (Soldering, 10

Sec)

Suggested IR Re-flow Soldering Curve

-40

60

10

+85

+260

A mA

°C

℃ / W

℃ / W

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. 0.70

6/19

FP8103

Recommended Operating Conditions

Parameter Symbol Conditions

Supply Voltage V cc

Min.

4.45

Typ.

Operating Temperature Ambient Temperature -40

DC Electrical Characteristics

(V cc

=5V, T

A

= 25°C, unless otherwise noted)

Max.

Unit

5.5 V

85 °C

Parameter

Standby Current

Shutdown Supply Current

CV Output (Float) Voltage

Symbol

I

SB

I

ST

V

FLOAT

Test Conditions

Charge Termination

V cc

< V

BAT

, V cc

< V

UVLO

R

PROG

not connect

0°C<T

A

<85°C

R

PROG

=2K

Min. Typ. Max.

Unit

55 100 µA

55

4.30 4.35

540 600

100

4.38

660

µA

V mA

BAT Pin Current I

BAT

R

PROG

=1.2K

Standby-Mode, V

BAT

=4.35V

Shutdown-Mode,

Sleep-Mode, V cc

=0V

Trickle Charge Current

Trickle Charge Threshold Voltage

Trickle Charge Hysteresis Voltage

I

TRIKL

V

TRIKL

V

TRKHYS

V

BAT

< V

TRIKL

,R

PROG

=2K

R

PROG

=2K, V

BAT

Rising

R

PROG

=2K

30

2.8

V cc

Under Voltage Lockout Threshold

V cc

Under Voltage Lockout Threshold

Hysteresis

V

UV

V

UVHYS

V cc

Rising 3.5

V cc

-V

BAT

Lockout Threshold V

ASD

V cc

Rising

V cc

Falling

PMOSFET On Resistance R

ON

C/10 Termination Current Threshold

PROG Pin Voltage

CHRGB Pin Output Low Voltage

I

TERM

R

PROG

=2K

R

PROG

=1.2K

V

PROG

R

PROG

=1.2K, Current Mode 0.9

V

CHRG

I

CHRG

=5mA

STDBYB Pin Output Low Voltage V

STDBY

Battery Recharge Threshold Voltage V

RECHRG

Temperature Limiting T

LIM

I

STDBY

=5mA

V

FLOAT

-V

RECHRG

TEMP Pin High Threshold Voltage V

TEMP-H

TEMP Pin Low Threshold Voltage

Soft-Start Time

V

TEMP-L

T

SS

T

RECHRG

I

BAT

=0 to I

BAT

=1200V/R

PROG

V

BAT

High to Low 0.8 Recharge Comparator Filter Time

C/10Termination Comparator Filter

Time

PROG Pin Pull-up Current

T

TERM

I

PROG

I

BAT

Falling below I

TERM

0.8

900 1000 1100

0 -2.5 -6

±1

-1

60

2.9

200

3.7

±2

-2

85

3.0

3.9

200

200

145

80

45

20

1.8

100

10

650

60

100

1.0

0.3

0.3

1.8

2

4

1.1

0.6

0.6

4 mV mS

µA mV

°C

%V cc

%V cc

µs mS mV mV mΩ mA mA

V

V

V mA

µA

µA

µA mA

V mV

V

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. 0.70

7/19

FP8103

Typical Operating Characteristics

(V

CC

=5V, T

A

= 25°C, unless otherwise noted)

PROG Pin Voltage vs. Supply Voltage

(Constant Current Mode)

1.01

1.005

1

0.995

0.99

0.985

0.98

4

V

BAT

=4V

R

PROG

=10K

4.5

5

Supply Voltage (V)

5.5

6

4.38

4.36

4.34

4.32

4.3

4.28

4

Battery Regulation(Float) Voltage vs. Supply Voltage

4.5

5

Supply Voltage (V)

R

PROG

5.5

=10K

6

Charge Current vs. Supply Voltage

Trickle Charge Current vs. Supply Voltage

1200

1000

800

600

400

200

0

4 4.5

5

Supply Voltage (V)

5.5

V

BAT

=4V

R

PROG

=1.2K

R

PROG

=2.4K

R

PROG

=10K

6

120

100

80

60

40

20

0

4 4.5

5

Supply Voltage (V)

5.5

V

BAT

=2.5V

R

PROG

=1.2K

R

PROG

=2.4K

R

PROG

=10K

6

1200

1000

800

600

400

200

0

2.6

2.8

Charge Current vs. Battery Voltage

Thermal Regulation

3

R

PROG

=1.2K

T

A

=0°C

T

A

=25°C

T

A

=50°C

3.2

3.4

3.6

V

BAT

(V)

3.8

4 4.2

4.4

Charge Current vs. Battery Voltage

1200

1000

800

600

400

200

0

2.6

2.8

T

A

=0°C

R

PROG

=1.2K

Vcc =4.4V

Vcc =5V

Vcc= 5.5V

3 3.2

3.4

3.6

V

BAT

(V)

3.8

4 4.2

4.4

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. 0.70

8/19

4.4

4.36

4.32

4.28

4.24

4.2

0

Battery Regulation(Float) Voltage vs. Charge Current

100 200 300

I

BAT

(mA)

R

400

PROG

=2K

500 600

Trickle Charge Threshold vs. Temperature

2.98

2.96

2.94

2.92

2.9

2.88

2.86

-50 -25 0 25

Temperature (°C)

50

R

PROG

=1.2K

75 100

1.02

1.01

1

0.99

0.98

0.97

-50 -25

PROG Pin Voltage vs. Temperature

0 25

Temperature (°C)

50

R

PROG

=1.2K

75 100

FP8103

Trickle Charge Current vs. Temperature

116

112

108

104

100

96

-50 -25 0 25

Temperature (°C)

V

50

BAT

=2.5V

R

PROG

=1.2K

75 100

4.4

4.36

4.32

4.28

4.24

-50

Battery Regulation(Float) Voltage vs. Temperature

-25 0 25

Temperature (°C)

50

R

PROG

=1.2K

75 100

Charge Current vs. Temperature

1200

1000

800

600

400

200

0

-50 -25 0

V

BAT

=4V

R

PROG

=1.2K

R

PROG

=2.4K

R

PROG

=10K

25 50 75

Temperature (°C)

100 125 150

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. 0.70

9/19

FP8103

Function Description

Operation

The FP8103 is a linear battery charger designed primarily for charging single cell lithium-ion batteries.

The charger uses a constant-current/constant-voltage charging algorithm with programmable current. Charging current can be programmed by an external single resistor. The FP8103 includes an internal P-channel power MOSFET and thermal regulation circuitry.

No blocking diode or external sense resistor are required . Thus, the basic charger circuit requires only two external components.

Furthermore, The FP8103 is capable of operating from a USB power source.

Normal Charge Cycle

A charge cycle begins when the voltage at the V cc 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 FP8103 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 approaches the final float voltage (4.35V), the FP8103 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

The charge current is programmed by a single resistor connected from the PROG pin to ground.

The battery charging current is 1200 times the current flowing out of the PROG pin. The required resistor value can be calculated from the charge current with following equation:

1200

R

PROG

=

I

CHG ( MAX )

The instantaneous charging current may differ from above equation in trickle or constant voltage modes. The instantaneous charging current provided to the battery can be determined by monitoring the PROG pin voltage at any time with the following equation:

V

PROG

I

CHG

=

R

PROG

× 1200

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. 0.70

10/19

FP8103

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 PROG pin. When the PROG pin voltage falls below 100mV for longer then

T

TERM

(1.8ms), charging is terminated. The charge current is shut off and the FP8103 enters standby mode, where the input supply current drops to 55uA. The FP8103 draws no current from the battery in standby mode.

This feature reduces the charge and discharge cycles on the battery, further prolong the battery life.

Thermal Protection

An internal thermal feedback loop reduces the programmed charge current if the die temperature rises above a preset value of approximately 145°C.

This feature protects the FP8103 from excessive temperature and allows the user to push the limits of the power handing capability of a given circuit board without risk of damaging the FP8103. The charge current can be set according to typical ambient temperature with the assurance that the charge will automatically reduce the current in worst case condition.

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 FP8103, two internal voltage references V

TEMP-H

and V

TEMP-L

are fixed at 80% ×V

CC

and 45% ×V

CC

respectively. As the

TEMP pin voltage rises above V

TEMP-H

or falls below V

TEMP-L

, the FP8103 stops charging and indicates a fault condition. After the system recovers from a temperature fault, the device w ill 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 T

L

~T

H

(T

L

< T

H

), then R

T

, the thermistor resistance, decreases as temperature increases from T

L

to T

H

, means R

TL

>R

TH

.

The TEMP pin voltage can be calculated as:

V

TEMP

R 1

R

2

R

//

2

R

T

// R

T

Vcc

Thus, this V

TEMP

decreases as the temperature increase from T

L

to T

H

.

To set proper R1 and R2 value for temperature protection, we set:

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. 0.70

11/19

R 2 //

0.8×Vcc= V

TEMPH

=

R 1

R 2

R

//

TL

R

TL

Vcc at T

L

R 2 // R

TH

0.45×Vcc= V

TEMPL

=

R 1

R 2 // R

TH

Vcc at T

H

Where R

TL

and R

TH

are the thermistor resistances at T

L

and T

H

respectively.

So R1 and R2 can be derived as following:

R

TL

R

TH

( K

2

K

1

)

R1=

( R

TL

R

TH

) K

1

K

2

R

TL

R

TH

=

( R

TL

R

TH

35

)

36

R

TL

R

TH

( K

2

R2=

R

TL

( K

1

K

1

K

2

) -

K

R

TH

( K

1

2

)

K

1

K

2

)

R

TL

R

TH

35

=

R

TL

9 R

TH

44 where K

1

=0.45 and K

2

=0.8

VIN

FP8103

Vcc

4

FP8103

BAT

5

Li-ion Battery

Bat+

Bat-

NTC

R1

R2

TEMP

1

GND

3

Under Voltage Lockout (UVLO)

An internal under voltage lockout circuit monitors the input voltage and keeps the charger in shutdown mode until V

CC

rises above the under voltage lockout threshold. The UVLO circuit has a built-in hysteresis of 200mV. Furthermore, to protect against reverse current in the power MOSFET, the

UVLO circuit force FP8103 to enter shutdown mode if V

CC

falls to within 10mV of the battery voltage. If the UVLO comparator is tripped, the charger will not come out of shutdown mode until V

CC

rises

100mV 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. 0.70

12/19

FP8103

Manual shutdown

At any point in the charge cycle, the FP8103 can be put into shutdown mode by removing R

PROG or put the EN pin to the low-level voltage. This reduces the battery drain current to about 2uA and the supply current to less than 55uA. A new charge cycle can be initiated by reconnecting the program resistor.

Automatic Recharge

Once the charge cycle is terminated, the FP8103 continuously monitors the voltage on the BAT pin using a comparator with a 1.8ms filter time (T

RECHARGE

). A charge cycle restarts when the battery voltage falls below 4.15V (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.

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. 0.70

13/19

FP8103

Application Information

Stability Considerations

The constant-voltage mode feedback loop is stable without an output capacitor if a battery is connected to the charger output. With no battery present, an output capacitor is recommended to reduce ripple voltage. When using high value, low ESR ceramic capacitors, it is recommended to add a

1

Ω resistor in series with the capacitor. No series resistor is needed if tantalum capacitors are used.

In constant-current mode, the PROG pin is in the feedback loop, not the battery. Because of the additional pole created by the PROG pin capacitance, capacitance on this pin must be kept to a minimum. With no additional capacitance on the PROG pin, the charger is stable with program resistor values as high as 25k. However, additional capacitance on this node reduces the maximum allowed program resistor. The pole frequency at the PROG pin should be kept above 100kHz. Therefore, if the

PROG pin is loaded with a capacitance, C

PROG

, the following equation should be used to calculate the maximum resistance value for R

PROG

:

R

PROG

2

π

× 10

5

1

× C

PROG

Average, rather than instantaneous, battery current may be of interest to the user. For example, if a switching power supply operating in low current mode is connected in parallel with the battery, the average current being pulled out of the BAT pin is typically of more interest than the instantaneous current pulses. In such a case, a simple RC filter can be used on the PROG pin to measure the average battery current as shown in Figure 1. A 10K resistor has been added between the PROG pin and the filter capacitor to ensure stability.

10k

PROG

FP8103

CHARGE

CURRENT

MONITOR

CIRCUITRY

GND

R

PROG

C

FILTER

FIGURE 1

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. 0.70

14/19

FP8103

Power Dissipation

The conditions that cause the FP8103 to reduce charge current through thermal feedback can be approximated by considering the power dissipated in the IC. For high charge current, the FP8103 power dissipation is approximately:

P

D

= (V

CC

-V

BAT

).I

BAT

Where P

D is the power dissipated, V

CC

is the input supply voltage, V

BAT

is the battery voltage and

I

BAT

is the charge current. It is not necessary to check any worst-case power dissipation scenarios because the FP8103 will automatically reduce the charge current to maintain the die temperature under 145°C approximately. The approximate ambient temperature at which the thermal feedback begins to protect the IC is:

T

A

=145

P

D

θ

JA

=145

(V

CC

V

BAT

)

.I

BAT

θ

JA

For example: Consider an FP8103 operating from a 5V wall adapter providing 1A to a 3.6V Li-Ion battery. The ambient temperature above which the FP8103 will begin to reduce the 1A charge current is approximately:

T

A

= 145°C

– (5V – 3.6V) • (1A) • 50°C/W

= 145°C

– 1.4W • 50°C/W = 145°C – 70°C

= 75°C

The FP8103 can be used above 75°C, but the charge current will be reduced to smaller than

1000mA. The approximate current at a given ambient temperature can be calculated:

I

BAT

=

145 ° C T

A

( Vcc V

BAT)

θ

JA

Using the previous example with an ambient temperature of 90°C, the charge current will be reduced to approximately:

I

BAT

=

145 ° C 90 ° C

(

5 V 3.6V

)

50 ° C/W

=

55 ° C

70 ° C/A

= 785mA

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. 0.70

15/19

FP8103

Furthermore, the voltage at the PROG pin will change proportionally with the charge current as discussed in the Programming Charge Current section. It is important to remember that FP8103 applications do not need to be designed for worst-case thermal conditions since the IC will automatically reduce power dissipation when the junction temperature reaches approximately 145°C.

Board Layout Considerations

Because of the small size of the SOP8, it is very important to apply a good thermal conduction PC board layout to maximize the available charge current. The thermal path for the heat generated by the

IC is from the die through the package leads(especially the ground lead) to the PC board copper. The

PC board copper is the heat sink. The copper pads footprint should be as large as possible and expand out to large copper areas to spread and dissipate the heat to the surrounding ambient.

Feed-through vias to inner or backside copper layers are also useful in improving the overall thermal performance of the charger. Other heat source on the board, not related to the charger, must also be consider when designing a PC board layout because they will affect overall temperature rise and the maximum charge current.

Vcc Bypass Capacitor

Many types of capacitors can be used for input bypassing, however, caution must be exercised when using multilayer ceramic capacitors. Because of the self-resonant and high Q characteristics of some types of ceramic capacitors, high voltage transients can be generated under some start-up conditions, such as connecting the charger input to a live power source. Adding a 1.5

Ω resistor in series with an X5R ceramic capacitors ( as shown in Figure 2) will minimize start-up voltage transients.

V

IN

Rcc

1

μF

Vcc

BAT

FP8103

GND

PROG

R

PROG

Li-lon

CELL

FIGURE 2

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. 0.70

16/19

FP8103

USB and Wall Adapter Power

Although the FP8103 allows charging from a USB port, a wall adapter can also be used to charge

Li-ion batteries. Figure 3 shows an example of how to combine wall adapter and USB power inputs. A

P-channel MOSFET, MP1, is used to prevent back conducting into the USB port when a wall adapter is present. The schottky diode, D1, is used to prevent USB power loss through the 10k

Ω pull-down resistor.

Typically, a wall adapter can supply significantly more current than the 500mA-limited USB port.

Therefore, an N-channel MOSFET, MN1, and an extra program resistor are used to increase the charge current to 600mA when the wall adapter is present.

5V WALL

ADAPTER

600mA I

CHG

I

CHG

D1

BAT

SYSTEM

LOAD

USB POWER

500mA I

CHG

FP8103

MP1

Vcc

+

PROG

GND

1

μF

Li-ion

Battery

12k

Ω

MN1

10k

Ω

2.4k

Ω

FIGURE 3

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. 0.70

17/19

Typical Application

V

IN

R0 0.4

C1

10

μF

R1

R2

R3 1.2k

1

TEMP

EN

8

2

PROG

7

CHRG

3

GND

FP8103

STDBY

6

4

Vcc

BAT

5

R4 1.5k

R5 1.5k

LED2

LED1

C2

10

μF

C3

0.1

μF

Bat+

Bat-

Li-ion

CELL

FP8103

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. 0.70

18/19

FP8103

Package Outline

SOP-8L (EP)

UNIT: mm

Symbols Min. (mm) Max. (mm)

A

A1

A2

D

E

H

L

θ°

1.346

0.050

4.800

3.810

5.791

0.406

1.752

0.152

1.498

4.978

3.987

6.197

1.270

Note:

Exposed PAD Dimensions:

Symbols

E1

D1

Min. (mm)

1.94

1.94

Max. (mm)

2.29

2.29

1. Package dimensions are in compliance with JEDEC outline: MS-012 AA.

2.

Dimension ”D” does not include molding flash, protrusions or gate burrs.

3.

Dimension “E” does not include inter-lead flash or protrusions.

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. 0.70

19/19

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