MM1581A - Mitsumi Electric Company, Ltd.

MITSUMI Lithium-Ion Battery Charge Control MM1581

Lithium-Ion Battery Charge Control

Monolithic IC MM1581

Outline

This is a lithium-ion battery charge control IC. It incorporates constant-voltage and constant-current circuits

for easy implementation of lithium-ion battery charge. It includes functions to disable charging to

overdischarged batteries and disable charging due to abnormal temperature, etc. It is also equipped with a 2-

channel LED driver to allow the charge status to be displayed.

Features

1. Operating supply voltage 4.8~15.0V

2. Operating ambient temperature -20~85ºC

3. Current consumption 7.0mA typ.

4. Low voltage detection voltage 1.54V typ. (rank A) 2.60V typ. (rank B)

5. BAT pin output voltage 4.20±0.03V

6. Recharge detection voltage 3.99V typ.

7. Precharge detection voltage 3.07V typ.

8. Fast-charge current setting Rsense=0.256V/IqCHG Example: For 0.512A, 0.256V/0.512A=0.5Ω(Rsence)

Precharge current 0.026V/Rsence=0.026/0.5Ω=0.052A

Full-charge adjustable for rank A

Full-charge current Example: When ADJ = 0.25V, 5 * 0.Ω*full-charge current=0.25V,

full-charge current=0.1A

9. Recharge delay time 0.48s (C1=0.1µF)

10. Full-charge detection delay time 0.52s (C2=0.1µF)

11. Temperature detection delay time 0.049s (C3=0.1µF)

12. LED switching delay time 1.0s (C2=0.1µF)

Package

TSOP-16A

Pin Assignment

TSOP-16A

(TOP VIEW)

13 762458

16 13 1115 14 12

1TDET 9C1

2C3 10 C2

3ADJ 11 N. C

4VREF 12 GND

5VCC 13 BAT

6N. C 14 CS

7LEDR 15 CS+

8LEDG 16 CNT

Application

For lithium-ion/lithium-polymer battery protection circuits

MITSUMI Lithium-Ion Battery Charge Control MM1581

Block Diagram

CS+

GND

VCC

LEDG

LEDR

Vref

ADJ

1TDET

3.07V

1.54V

3.21V

1.49V

Rated voltage

control circuit Rated current

control circuit

Mis-detection

prevention

circuit

Mis-detection

prevention

circuit

Mis-detection

prevention

circuit

Current

detection

circuit

Reference

power

supply

MITSUMI Lithium-Ion Battery Charge Control MM1581

Pin no.

Pin name

I/O Function Internal equivalent circuit diagram

VCC

GND

1TDET Input Temperature detection and

battery connection

detection pin

(used for both)

VCC

GND

2C3 Input Temperature detection

delay. Time setting pin

(TPd=49ms

C3=0.1µF)

VCC

GND

3ADJ Input Charging detection voltage

setting pin

(typ.=49ms

C3=0.1µF)

Pin Description

MITSUMI Lithium-Ion Battery Charge Control MM1581

Pin no.

Pin name

I/O Function Internal equivalent circuit diagram

VCC

GND

4VREF Output Reference voltage

output in

(typ.=4.53V)

5VCC

GND

5VCC Input Power voltage

LED connection pin

Lights up during charging

(open collector output)

VCC

GND

6N. C N.C

7LEDR Output

MITSUMI Lithium-Ion Battery Charge Control MM1581

Pin no.

Pin name

I/O Function Internal equivalent circuit diagram

VCC

GND

8LEDG Input LDE connection pin

when charging is complete

(open collector output)

VCC

GND

9C1 Input Current detection delay

time setting pin

(typ.=0.48s

C3=1.0µF)

VCC

GND

10 C2 Input Current detection delay

time setting pin

(typ.=0.48s

C2=1.0µF)

MITSUMI Lithium-Ion Battery Charge Control MM1581

Pin no.

Pin name

I/O Function Internal equivalent circuit diagram

VCC

GND

11 N. C N. C

12 GND GND pin

13 BAT Input Battery voltage detection

GND

14 CS

Input Charging current

detection pin

(connect to low detection

resistance side)

GND

15 CS+ Input Charging current

detection pin

(connect to high detection

resistance side)

MITSUMI Lithium-Ion Battery Charge Control MM1581

Pin no.

Pin name

I/O Function Internal equivalent circuit diagram

VCC

GND

16 CNT Output Output pin

(open collector output)

Absolute Maximum Ratings (Ta=25°C)

Item Symbol Ratings Units

Storage temperature TSTG

40~+150 °C

Operating temperature TOPR

20~+85 °C

Supply voltage VIN

0.3~+16 V

CNT pin output current ICNT 30 mA

TDET pin output voltage VTIN

0.3~VCC V

Allowable loss Pd

400 (Not attached)

Recommended Operating Conditions (Ta=25°C)

Item Symbol Ratings Units

Operating temperature TOPR

20~+85 °C

CNT current 1CNT 0~30 mA

Operating voltage VOP 4.8~15.0 V

MITSUMI Lithium-Ion Battery Charge Control MM1581

Electrical Characteristics

(Except where noted otherwise, Ta=25°C, V

=12V, VSENSE=3.6V, C1=1.0µF, C2=1.0µF, C3=0.1µF)

Item Symbol Measurement conditions

Measurement

Min. Typ. Max. Units

Circuit

Consumption current ICC When LED OFF a 4 7 10 mA

Reference voltage Vref a 4.30 4..53 4.76 V

Low voltage detection voltage

VLV VBAT: L H a 1.44 1.54 1.64 V

Pre-charge detection voltage VPVBAT: L H a 2.97 3.07 3.17 V

BAT pin output voltage VBAT a 4.17 4.20 4.23 V

Re-charge detection voltage VRVBAT: H L a 3.89 3.99 4.09 V

BAT pin input current IBAT b

22µA

Current Limit 1 VIL1

1.54V < Battery voltage <3. 07V

a152637mV

Pre-charge

5.0V <

= VCC <

= 8.0V

Current Limit 2

1VIL2

3.07V <

= Battery voltage <

= 4.2V

a 232 256 280 mV

Quick charge

8.0V<VCC <

= 15.0V

Current Limit 2

2VIL2

3.07V

Battery voltage

4.2V

a 237 257 275 mV

Quick charge

Full charge detection voltage 1

VFlVadj=0.13V a 15 26 37 mV

Full charge detection voltage 2

VF2Vadj=0.5V a 75 100 125 mV

CS+ pin input current ICS+VCS+

3.6V a 60 85 µA

pin input current ICS

VCS

=3.6V a 60 85 µA

LED R pin output voltage VLEDR ILED R=10mA b 0.4 V

LED G pin output voltage VLEDG ILED G=10mA b 0.4 V

Battery temperature VTH1a3.11 3.21 3.31 V

detection voltage H1

Battery temperature VTL1a1.39 1.49 1.59 V

detection voltage L1

Battery temperature VTH2

Vref=4.53V

a 3.13 3.23 3.33 V

detection voltage H2

Battery temperature VTH2a1.49 1.59 1.69 V

detection voltage L2

TDET pin input bias current ITb

1.0 µA

CNT pin output voltage VCNT ICNT=20mA b 1.0 2.0 V

CNT pin leak current ICNT VOUT=15V b l.0 µA

Re-charge detection delay time

tdcl Re-charge time C1=1.0µF c 0.34 0.48 0.62 s

Connection detection time 1 tdBDET

4.2V constant voltage output time C2=1.0µF

c 0.37 0.52 0.67 s

Fullcharge detection delay time

tdIDET C2=1.0µF c 0.37 0.52 0.67 s

LED switching delay time tdILED C2=1.0µF c 0.71 1.00 1.3 s

Discharge time tdchg

C2=1.0µF (after current detection)

c1341 ms

Temperature detection delay time

tdC3C3=0.1µF c 34 49 64 ms

MITSUMI Lithium-Ion Battery Charge Control MM1581

Measuring Circuit

VTIH1, 2

VTL1, 2

=1.0µF

C4=1.0µF

C5=1.0µF

C3=0.1µF

C2=1.0µF

VLV

VR VBAT

IBAT

VBAT

D1IDS

IDS+

SW1

100mA b a

VLEDR

10kΩ

VLEDG

ICC

Vadj

Vref

100Ω

0.1µF

R2 240Ω

VCC

R1 680Ω

R4 1ΩVL1, VL-1, 2

VF1, VF2

Measuring circuit A

Note SW1 = b only during BAT pin output voltage measurement

MITSUMI Lithium-Ion Battery Charge Control MM1581

1 16

VTIN IT

SW2

VCNT

ICNT

ICS+ VCS+

ICS

VCS

IBAT VBAT

VCNT

C1=1.0µF

C4=1.0µF

C2=1.0µF

C3=0.1µF

C5=10µF

VLEDR

10mA

VCC

Vadj

10mA

20mA

Measuring circuit B

Note SW2 = b only during CNT pin gain leak current measurement

MITSUMI Lithium-Ion Battery Charge Control MM1581

C1=1.0µF

C4=1.0µF

1kΩ

C1=10µF

VCC

Vadj

oscilloscope

VCC

100Ω

0.1µF

R2 240Ω

R1 680Ω

R4 1Ω

C3=0.1µF

C2=1.0µF

VBAT

Current probe

VBAT

Measuring circuit C

MITSUMI Lithium-Ion Battery Charge Control MM1581

Application Circuit

13BAT

1SE

1SE+

CNT

C2 C1 C3GND

16 12 9 2

VCC

LED G

LED R

Vref

ADJ

TDET

3.07V

1.54V

3.21V

1.49V

Rated voltage

control circuit Rated current

control circuit

Mis-

detection

prevention

circuit

Mis-

detection

prevention

circuit

Mis-

detection

prevention

circuit

Current

detection

circuit

RSENCE

1µF

1.0µF 1.0µF 0.1µFB

B+

Vref

Reference

power

supply

Battery

pack

MITSUMI Lithium-Ion Battery Charge Control MM1581

Operation

12-1 Charging operation

Charging is prohibited in the following cases.

1. AC adaptor or battery is not connected properly.

2. TDET pin voltage is outside the range from battery temperature detection voltage L1 to battery

temperature detection voltage H1.

If neither of the above problems exists, charging starts.

12-2 Battery voltage check operation

·When potential within the range from battery temperature detection voltage L1 to battery temperature

detection voltage H1 is impressed on the TDET pin, then after temperature detection delay time, VBAT

output voltage is 4.2V. Then, after 1.15 seconds (when C2 = 2.2µF) output voltage is switched to

1.46V, battery voltage is detected and charging starts.

(Voltage detection is not performed during this time.)

Also, during 4.2V constant voltage output, current detection resistance voltage drop is limited to

256mV.

12-3 Abnormal battery detection

·Charging is stopped if, after battery voltage check, the battery is deemed abnormal because battery

voltage goes below low voltage detection voltage.

12-4 Pre-charge operation

·Charging is done by pre-charge current when, after battery voltage check, battery voltage is below

low voltage detection voltage (VLV).

12-5 Full charge operation

·When battery voltage rises and BAT pin voltage reaches pre-charge detection voltage (VP), the

battery is charged by full charging current. The standard value for full charging current is determined

by the value obtained by dividing current limit 1 (VL1) by the external resistance between CS+ and

CS-.

·When battery voltage rises, the operation switches from constant current charging to constant

voltage charging when BAT pin voltage approaches BAT pin output voltage (VBAT).

·After switching to constant voltage charging, charging current gradually diminishes. When charging

current goes below the value obtained by dividing full charge detection voltage (VF) by the external

resistance between CS + -CS, charging is completed after full charge detection delay time and the

LED G pin open collector NPNP transistor goes on.

(LED G stays lit except when (1) AD adaptor is removed, or (2) when outside battery temperature

detection voltage range (including removal of battery).)

·If battery voltage is already at BAT pin voltage when charging starts, charging is completed after full

charge detection delay time, and the LED G pin open collector NPN transistor goes on.

12-6 Re-charge operation

·After full charge detection, battery voltage drops from charging completed state, and re-charge starts

when it goes below re-charge detection voltage.

12-7 Temperature monitoring function

·The potential divided from VREF by the external resistor and thermistor is monitored by the TDET pin.

·When a thermistor is not used, a resistor can be connected to enable charging, but temperature

protection will no longer operate. Battery open detection assumes a removable thermistor in the

battery pack. A battery open detection circuit would be required if a thermistor is not used.

MITSUMI Lithium-Ion Battery Charge Control MM1581

12-8 Charging state verification

·The open collector NPN transistor inside LEDR normally goes on during pre-charging and full

charging operations. When a PULL UP connection is made to LEDR via the red LED and a resistor,

pre-charging and full charging can be verified by the red LED lighting up and staying lit.

12-9 Charging complete verification

·When full charge is detected, the open collector NPN transistor inside the LEDR pin goes off after full

charge delay time elapses, and the open collector NPNP transistor inside the LEDG pin goes on. Full

charge can be verified by making pull-up connections between the LEDR pin and red LED and LEDG

pin and green LED via resistors and checking that the red LED is off and the green LED is flashing,

12-10 Check charging prohibited state

·For the following charging prohibited states, the LED G pin and LED R pin open collector NPN

transistors remain off. The LEDs do not light up.

1. Battery is not connected properly.

2. AC adapter is not connected properly.

3. Battery temperature is outside charging start temperature range.

12-11 Recovery after charging prohibited state

·The conditions are as follows for recovery after charging prohibited state:

1. Cut connection to charger and re-connect.

2. Cut battery connection and re-connect.

12-12 Quick charge and charging complete settings

1. Setting current value (Iqchg) for quick charge

Quick charge current value Icqchg depends on sensing resistor resistance value Rsense.

Insert the desired quick charge value Iqchg into the following formula and set the sensing resistor

value.

Charging current setting voltage 2 256mV

Rsense (Ω) = =

Iqchg (mA) Iqchg (mA)

Pre-charge current at this time becomes the following value.

charging current setting voltage 1 26mV

Pre-charge current (A)= =

Rsense (Ω) Rsense (Ω)

2. Setting charging complete detection current value (Icomp)

Charging complete detection current value Icomp depends on sensing resistor resistance value

Rsense and ADJ pin voltage Vadj. Insert the desired charging complete detection current value and

the sensing resistor value set in 1. into the following formula to set ADJ pin voltage.

Vadj (V) =5 Rsense (Ω) Icomp (A) (Note) is IC internal fixed value

Note

MITSUMI Lithium-Ion Battery Charge Control MM1581

The graph below shows examples of ADJ pin voltage setting and the relationship between charging

complete detection current (Icomp) and ADJ pin voltage (Vadj). Please use as reference for sensing

resistor and ADJ pin voltage settings.

ADJ pin voltage setting examples

Use several 10kΩfor ADJ resistor (R, R2) total resistance value.

Quick charge 256mA 450mA 512mA 700mA

Sensing resistor Rsense 1Ω0.56Ω0.50Ω0.36Ω

Charging complete current Icomo

26mA 100mA 130mA 100mA 130mA 100mA 130mA

ADJ pin voltage 125mV 280mV 364mV 250mV 325mV 180mV 234mV

Vadj=5 Rs Icomo

MITSUMI Lithium-Ion Battery Charge Control MM1581

Flow Chart

Battery set

1.59 VTDET 3.23V

Temperature detection

delay circuit start

after 49ms

1.59 VTDET 3.23V

LED R lit

256mA constant current charging

4.2V constant voltage (output for 0.48s)

1.46V constant voltage output

Battery voltage check

Charging current check

Battery voltage check

VBAT 3.07V

26mA constant current charging

4.2V constant voltage charging

Current detection

delay circuit start

Current detection

(output voltage 1.46V switching)

LED R: not lit

LED G: lit

Connection

Charging complete

LED R: not lit LED G: lit

Charging current

Charging complete current below

(fixed 0.52s)

1.0s passed

Battery voltage check

VBAT 3.99V

Battery voltage check

VBAT 3.99V

(fixed for 0.48s)

Voltage detection

delay circuit start

Charging prohibited

Charging OFF

LED R, LED G: not lit

Charging prohibited

Charging OFF

LED R, LED G: not lit

ADJ pin voltage

5 Rsence

Charging complete current=

4.2V constant voltage charging

Charging current check

Current detection

delay circuit start

Charging current

Charging complete current below

(fixed 0.52s)

Current detection

(Voltage output 1.40V switching)

for constant voltage charging or

constant current charging

(1.49 VTIN 3.21V)

LED R or G lit up

1.49 VTDET 3.23V

Temperature delay time

delay circuit start

after 49ms TDET voltage

VTDET 1.49V

3.23V VTDET

Charging prohibited

LED: not lit

Temperature delay time

delay circuit start

1.59 VTDET 3.21V

after 49ms TDET voltage

1.58V VTDET 3.21V

Yes

Yes Yes

Yes

4.2V VBAT

3.07V VBAT 4.2V

1.54V VBAT 3.07V

1.54V VBAT 4.2V

3.07V VBAT 4.2V

1.54V VBAT

Charging complete

current

below

Charging complete current

below

Charging complete

current

below

Charging complete current

below

Temperature detection during charging

(temperature hysteresis function) flow chart

4.2V VBAT

MITSUMI Lithium-Ion Battery Charge Control MM1581

Timing Chart

4.2V

1.46V

Voltage detection

Current detection

Charging start

49ms

0.52s

45°C

42.5°C

3°C

2.5°C

OFF

Charge

49ms 49ms 49ms 49ms

4.20V

3.99V

3.07V

1.54V Pre-charge full charge Constant voltage charge

0.48s

26mA

0.52s

256mA

ADJ voltage/

5 RSENCE

26mA

256mA

Constant voltage charge

(It charges by the

impedance of a battery.) Charging stop 256mA

The completion of battery temperature detection

0.52s Re-charge

Completion of charge

Lighting

Putting out lights

0.48s

Putting out lights

Lighting

Battery connection

Charge LED R

OFF

Charge LED G

OFF

BAT pin voltage

Battery temperature

Constant current charge

Battery voltage

Charge current

Timing at the time of battery connection

Timing at the time of charge

Temperature detection timing

MITSUMI Lithium-Ion Battery Charge Control MM1581

Characteristics

(Except where noted otherwise, Ta=25°C, V

=12V, VSENSE=3.6V, C1=1.0µF, C2=1.0µF, C3=0.1µF)

Consumption current characteristic Standard voltage characteristic

VCC (V)

0123456789101112131415

ICC (mA)

VCC (V)

01234567891011121314 15

0.0

1.0

2.0

3.0

4.0

5.0

6.0

Output voltage (V)

Charge current characteristic

VBATT (V)

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

100

150

200

250

300

IBAT (mA)

TDEF characteristic

VBAT pin characteristic

VIDET (V)

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

100

150

200

250

300

IBAT (mA)

VBAT (V)

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

1.0

0.8

0.6

0.4

0.2

0.4

0.6

0.8

1.0

IBANT (µA)

TDET pin current characteristic

VTDET (V)

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0

ITDET (µA)

MITSUMI Lithium-Ion Battery Charge Control MM1581

Re-charge delay time vs capacitance

value

Temperature detection delay time vs

capacitance value

C1 capacitance value (µF)

0.1 1 10 100

0.01

0.10

1.00

10.00

100.00

Delay time (s)

C3 capacitance value (µF)

0.01 0.1 1 10

0.001

0.010

0.100

1.000

10.000

Delay time (s)

Connection detection delay time vs

capacitance value

C2 capacitance value (µF)

0.1 1 10 100

0.01

0.1

100

1000

Delay time (s)

Full charge detection delay time vs

capacitance value

LED switch delay time vs capacitance

value

C2 capacitance value (µF)

0.1 1 10 100

0.01

0.1

100

1000

Delay time (s)

C2 capacitance value (µF)

0.1 1 10 100

0.1

1.0

10.0

100.0

1000.0

Delay time (s)

Discharge time vs capacitance value

C2 capacitance value (µF)

0.1 1 10 100

0.001

0.010

0.100

1.000

10.000

100.000

Delay time (s)