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MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
IC for Control of Lithium-ion Batteries Charging
Monolithic IC MM1433
Outline
This IC is used to control charging of lithium-ion batteries. This one IC incorporates functions for constantcurrent and constant-voltage charging and for precharging, for an overcharge timer, battery temperature detection, and other protective functions. It was developed by adding to the previous MM1332 and 1333 the above-described functions.
Features
1. Charging voltage accuracy 2. Consumption current 3. Precharge function. 4. Recharge function. 5. Overcharge timer. 6. Battery temperature detection function. 7. We can supply type for one and two cells. 30mV/cell. 5mA typ.
Package
TSOP-24A
Applications
IC for control of lithium-ion batteries charging.
Pin Assignment
1 2 3 4 24 23 22 21 20 19 18 17 16 15 14 13 5 6 1 2 3 4 5 6 7 8 9 10 11 12 TSOP-24A 7 8 9 10 11 12 CHGSW RESET TP1 TP2 VREF GND1 GND2 ADJ1 ADJ2 ADJ3 ADJ4 TDET 13 14 15 16 17 18 19 20 21 22 23 24 BAT1 BAT2 CS CFB CNT VCC ADJ5 VOUT LED G LED R OSC OUT OSC FB-
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Block Diagram
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Pin Description
Pin No. Pin name CHGSW I/O Forced charging OFF pin 1 Input L: Forced charging circuit ON (OFF for reset) H: Charging stop is forced Logic reset pin 2 RESET Input L: Forced charging circuit ON (start) H: Forced charging circuit OFF Test pin 1 Pre-charge timer test pin 3 TP1 Input/ Output Inverts while counting (the middle stage of the several FF stages) and output to TP1, to permit monitoring. Also, TP1 output signal is inverted again inside the IC and inputs to the next stage FF. (Timer setting is done by binary counter.) TP2 Input/ Output Test pin 2 Full charge timer test pin Same structure as TP1 Reference power supply output pin 5 VREF GND1 GND2 ADJ1 Output Input Input Input Outputs 1.2V typ. reference voltage. Used for temperature detection reference power supply and ADJ1 - ADJ4 adjustment. 6 7 8 Ground pin. Ground pin. Overcurrent detection adjustment pin Set so that overcurrent detection does not function. Pin voltage is 1.16V typ. Full charge detection adjustment pin Pin voltage is set at 93mV typ. Full charge detection value can be changed by 9 ADJ2 Input adjusting pin voltage with an external resistor, etc. Full charge detection is done by comparing ADJ2 pin voltage and 12dB voltage drop value between CS and BAT. Pre-charge current adjustment pin Pin voltage is set at 120mV typ. Pre-charge current can be changed by adjusting 10 ADJ3 Input pin voltage with an external resistor, etc. Pre-charge current control is done by comparing ADJ3 pin voltage and 12dB voltage drop value between CS and BAT. Full charge current adjustment pin Pin voltage is set at 0.89mV typ. Full charge current can be changed by adjusting pin voltage with an external resistor, etc. 11 ADJ4 Input Full charge current control is done by comparing ADJ4 pin voltage and 12dB voltage drop value between CS and BAT. When full charge current is controlled to rated current by an adapter, short ADJ4 pin and VREF pin so that rated current control does not function in the IC. Functions
4
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Pin No. Pin name
I/O Temperature detection input pin
Functions Apply potential resistance divided by external resistor and thermistor from reference voltage when using. Reset state will exist if TDET pin does not reach the specified potential. Battery voltage input pins Detect battery voltage and control charging. Current detection pin Detects current by external resistor (between CS and BAT) voltage drop and controls charging current. Rated current control phase compensation pin
12
TDET
Input
13 14
BAT1 BAT2 CS
Input Input Input
15
16
CFB
Input
Oscillation is improved by connecting an external capacitor (around 100pf) between CFB and CNT for phase compensation. Charging control output pin Controls external PNP-Tr base for rated current rated voltage charging. Power supply input pin Rated voltage control adjustment pin Allows fine adjustment of rated voltage value. For example, rated voltage value rises by around 15mV (at 4.1V typ.) when ADJ5-GND is shorted. Overvoltage detection output pin
17 18
CNT VCC ADJ5
Output Input Input
19
20
VOUT
Output
For VCC overvoltage input: L For VCC recommended operating voltage: H LED C control output pin NPN-Tr open collector output. Refer to the flow chart for ON/OFF. LED R control output pin NPN-Tr open collector output. Refer to the flow chart for ON/OFF. Oscillator output pin Timer setting time changes according to oscillation frequency. Oscillation frequency is determined by an external resistor (connected between OSC OUT and OSC FB) and capacitor (connected between OSC FB and GND). For example, the full charge timer setting is 4H for external resistor of 130k and capacitor of 0.01F.
21
LED G LED R
Output Output
22
23
OSC OUT Output
24
OSC FB-
Input
Oscillator inverted input pin
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Pin Description
Pin No. Pin name
(The values below are average values) Equivalent circuit diagram Pin No. Pin name Equivalent circuit diagram
Equivalent circuit diagram Pin No. Pin name
1
CHGSW
10
ADJ3
17
CNT
2
RESET
11
ADJ4
19
ADJ5
3
TP1
12
TDET
20
VOUT
4
TP2
13
BAT1
21
LED G
5
VREF
14
BAT2
22
LED R
8
ADJ1
15
CS
23
OSC OUT
9
ADJ2
16
CFB
24
OSC FB-
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage Allowable loss
(Ta=25C)
Symbol TSTG TOPR VCC max. Pd
Ratings -40~+125 -20~+70 -0.3~+15 250
Unit C C V mW
Recommended Operating Conditions
Item Operating temperature Charging control operating voltage Symbol TOPR VOPR Ratings -20~+70 2.7~5.9 Unit C V
Electrical Characteristics
Item Consumption current Reference voltage ADP detection voltage L ADP detection voltage L Hysteresis voltage width ADP detection voltage H ADP detection voltage H Hysteresis voltage width Impedance for ADP detection output L BAT pin leak current BAT pin output voltage CNT pin output voltage CHGSW pin input current CHGSW pin input voltage H CHGSW pin input voltage L RESET pin input current RESET pin input voltage H RESET pin input voltage L Current limit 1 Current limit 2 Full charge detection Low voltage detection voltage
(Except where noted otherwise, Ta=25C, VCC=5V) Measurement Min. Typ. Max. Unit circuit 18 5 VCC : H L 20 20 VCC : L H 20 20 20 13, 14, 15 Ta=0~+50C ICNT=20mA CHGSW : OFF CHGSW : ON Charging control circuit: OFF Charging control circuit: ON Quick charge Pre-charge VBAT : L H 13 17 1 1 1 2 2 2 14, 15 14, 15 14, 15 13 0.20 21 13 1.90 0.22 26 18 2.00 40 0.6 60 40 0.6 60 2.35 50 6.1 50 5.0 1.207 2.45 100 6.3 100 30 1 4.070 4.100 4.130 0.5 80 1.20 0.25 80 1.20 0.25 0.24 31 23 2.10 2.55 150 6.5 150 7.0 mA V V mV V mV k A V V A V V A V V V mV mV V
Symbol ICC VREF VADPL VADPLW VADPH VADPHW ZADPL IBAT VBAT VCNT ISW VSWH VSWL IRE VREH VREL VL1 VL2 VF VLV
Conditions
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Item Low voltage detection voltage Hysteresis voltage width Pre-charge detection voltage Pre-charge detection voltage Hysteresis voltage width Re-charge detection voltage Overvoltage detection voltage Battery temperature detection voltage H Battery temperature detection voltage L1 Battery temperature detection voltage L2 TDET input bias current LED R pin output voltage LED G pin output voltage Timer error time
Symbol VLVW VP VPW VR VOV VTH VTL1 VTL2 IT VLEDR VLEDG T
Conditions
Measurement Min. Typ. Max. Unit circuit 13 25 2.80 25 3.85 4.30 50 2.90 50 3.90 4.35 100 3.00 100 3.95 4.40 mV V mV V V V V V nA V V %
VBAT : L
H
13 13
VBAT : H VBAT : L
L H
13 13 12 12 12 12
Low temperature 3C 3C detection High temperature 43C 3C detection (charging start) High temperature 50C 3C detection (during charging) ILEDR=10mA ILEDG=10mA Not including external deviation
0.835 0.860 0.885 0.390 0.413 0.435 0.335 0.353 0.370 30 150 0.4 0.4 -10 10
22 21 21, 22
Note 1: Current limits 1 and 2 and full charge detection are specified at current detection resistor voltage drop. Note 2: If the IC is damaged and control is no longer possible, its safety can not be guaranteed. Please protect with something other than this IC. Note 3: Temperature detection is the setting value at B constant 3435 (10KC15-1608 made by Ishizuka Denshi). Note 4: Use a capacitor with good temperature characteristics in the oscillator. Capacitor deviation will contribute to timer error. Note 5: If the battery overdischarges, charge 1mA for 14 seconds, and if it does not switch to pre-charging during that interval, it means the IC has identified a battery abnormality.
OSC CR Setting Reference Materials
(1) OSCR CR-Oscillation Cycle T Examples R C 0.0047 0.0082 0.01 0.015 0.022 75k 0.47mS 0.83mS 1.03mS 1.48mS 2.16mS 100k 0.63mS 1.10mS 1.37mS 1.98mS 2.87mS 120k 0.75mS 1.32mS 1.63mS 2.38mS 3.44mS 130k 0.82mS 1.43mS 1.77mS 2.58mS 3.73mS 150k 0.94mS 1.65mS 2.04mS 2.97mS 4.30mS 200k 1.26mS 2.20mS 2.73mS 3.95mS 5.76mS
MITSUMI (2) Timer Times
IC for Control of Lithium-ion Batteries Charging MM1433
Item Calculation formula Pre-charge timer T 219 Full charge timer T 223 1mA charge time T 213 Full charge detection delay time T 26 Overcurrent detection delay time T 28 Overvoltage detection delay time T 28 Re-charge detection delay time T 25 LED R blinking cycle T 210 Note: T: OSC oscillation cycle
Examples of calculation (for C = 0.01, R = 230k) 15min. 28S 4h7min. 14.5S 0.11S 0.45S 0.45S 56.6mS 1.8S
Measuring Circuit
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Measurement Procedures
Item Consumption current Reference voltage ADP detection voltage L ADP detection voltage L Hysteresis voltage width ADP detection voltage H ADP detection voltage H Hysteresis voltage width Impedance for ADP Ldetection output BAT pin leak current BAT pin output voltage CNT pin output voltage CHGSW pin input current CHGSW pin input voltage H CHGSW pin input voltage L RESET pin input current RESET pin input voltage H RESET pin input voltage L Current limit 1 Current limit 2 Full charge detection Low voltage detection voltage Low voltage detection voltage Hysteresis voltage width Pre-charge detection voltage Pre-charge detection voltage Hysteresis voltage width Re-charge detection voltage Overvoltage detection voltage Battery temperature detection voltage H Battery temperature detection voltage L1 Battery temperature detection voltage L2 TDET input bias current LED R pin output voltage LED G pin output voltage
(Except where noted otherwise, Ta = 25C, VCC=5V, V1=V2=0V, V13=4.2V, SW12, 17, 20, 22, 24:A, I15=0mA Timers are not in time up state.)
Measurement Procedures V1 = 1.2V. Measure A18 current value ICC. Measure T5 potential VREF. Gradually lower Vcc from 5V; VCC - potential is VADPL when T20 potential drops below 0.5V. Gradually lower VCC - from 2V. VCC - potential is VADPL2 when T20 potential goes over VCC - 0.5V. VADPLW = VADLP2 - VADPL Gradually increase Vcc from 5V. Vcc potential is VADPH when T20 potential drops below 0.5V. Gradually lower VCC from 7V. VCC potential is VADPH2 when T20 potential goes over VCC - 0.5V. VADPHW = VADPH - VADPH2 VCC = 7V, SW20: B, V20 - 0.5V, impedance between T20-GND is ZADPL. VCC = 0V, SW17: B, V17 = 0V. Measure A13 current value IBAT. Gradually lower V13 from 3.5V. T13 potential is VBAT when T15 - T13 potential difference falls to less than 20mV. V13 = 3.5V, SW17: B. Gradually raise V17 from 0V. T17 potential is VCNT when A17 current value 20mA. Measure A1 current value ISW. V13 = 3.5V. Raise V1 from 0V to 1.2V. CHGSW: ON when A13 is more than 500mA. CHGSW: OFF when A13 is less than 1mA. Measure VSW. Measure A2 current value IRE. V13 = 3.5V. Raise V2 from 0V to 1.2V. Charging control circuit: ON when A13 is more than 500mA. Charging control circuit: OFF when A13 is less than 1mA. Measure VRE. V13 = 3.5V. T15-T13 potential difference is VL1. V13 = 3.5V. T15-T13 potential difference is VL2. SW24: B, I15 = 100mA. Gradually reduce I15 current value after reset. T15 T13 potential difference is VF when T21 potential goes under 0.5V. Gradually raise V13 from 0V. T13 potential is VLV when A13 current value goes over 50mA. Gradually lower V13 from 2.5V. T13 potential is VLV2 when A13 current value goes over 10mA. VLVW = VLV - VLV2 Gradually raise V13 from 2.5V. T13 potential is VP when A13 current value goes over 500mA. Gradually lower V13 from 3.5V. T13 potential is VP2 when A13 current value goes under 150mA. VPW = VP= VP2 Wait about 1S at V13 = 4.2V; in full charge detection state, gradually lower V13 potential to lower T21 potential to under 0.5V. T13 potential is VR when T21 potential is more than VCC - 0.5V. Gradually raise V13 from 4V. T13 potential is VOV when T22 potential starts to repeat HI/LOW. V13 = 3.5V, SW12: B. Gradually raise V12 from 0.6V. T12 potential is VTH when A13 current value goes under 1mA. V13 = 3.5V, SW12: B. Gradually raise V12 from 0V. T12 potential is VTL1 when A13 current value goes over 500mA. V13 = 3.5V, SW12: B. Gradually raise V12 from 0.6V. T12 potential is VTL2 when A13 current value goes over 1mA. SW12: B, V12 = 0V. Measure A12 current value IT. V13 = 3.5V, SW22: B. Gradually raise V22 from 0V. T22 potential is VLEDR when A22 current value is 10mA. Wait about 1S at V13 = 4.2V; in full charge detection state, make T21 potential 0.5V or less. Next at SW21: B, gradually raise V21 from 0V. T21 potential is VLEDG when A21 current value is 10mA.
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Timing Chart
Charging performed normally
VCC: ON Start 5.5V 0V
Adapter abnormality
VCC
0V 7V
VCC
BAT pin voltage
4.1V 2.9V 2V
BAT pin voltage
3.9V 0A
3V
Charging current
Charging current
0A 1mA Charging Pre- Full charge charge 0A Full Recharge charge OFF ON
LED R
OFF
LED G
OFF
LED R
ON
LED G
OFF
ON
OFF
Power supply setting error (temperature detection pin open)
VCC
0V 5.5V
Battery overcharge
VCC
0V 5.5V
BAT pin voltage
0A
3V
BAT pin 4.35V voltage Charging current
0A
Charging current
Abnormality detection at BA pin overvoltage for 0.5S or more
LED R
OFF
LED R
ON/OFF 0.57Hz
LED G
OFF
LED G
OFF
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Battery overdischarge
VCC
0V 5.5V
Overcurrent detection
Overcurrent detection does not function
BAT pin voltage
0V
2V or less 14S 1mA charging
No battery voltage reset
Charging current
0A
LED R
ON/OFF 0.57Hz
LED G
OFF
Pre-charge time up
VCC
0V 5.5V Battery voltage 2V or less 15min. Charging at about 12% of full charge ON ON/OFF 0.57Hz Battery voltage 2.9V or less
Full charge time up
VCC
0V 5.5V Battery voltage 2.9V or more 4H Full charge No full charge detection
BAT pin voltage Charging current
0A
BAT pin voltage Charging current
0A
LED R
LED R
ON ON/OFF 0.57Hz
LED G
OFF
LED G
OFF
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Battery full charge
VCC
0V 4.1V 5.5V
Re-charge detection
VCC 5.5V
3.9V 0V
BAT pin voltage Charging current
0A
0.11S
1
BAT pin voltage Charging current
0A
56mS Full charge
LED R
ON
OFF
LED R
OFF
ON
LED G
OFF
ON
LED G
ON
OFF
Application Circuit
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Flow Chart
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Characteristics
Current limit 1 - Temperature
0.3
Current limit 2 - Temperature
50
Current limit 2 (mV)
0 25 50 75
Current limit 1 (V)
0.25 0.2 0.15 0.1 -25
40 30 20 10 0 -25 0 25 50 75
Ambient temperature (C)
Ambient temperature (C)
BAT pin output voltage - Temperature
BAT pin output voltage (V)
4.15 4.14 4.13 4.12 4.11 4.1 4.09 4.08 4.07 4.06 4.05 -25
Re-charge detection voltage - Temperature
Re-charge detection voltage (V)
3.95 3.94 3.93 3.92 3.91 3.9 3.89 3.88 3.87 3.86 3.85 -25
0
25
50
75
0
25
50
75
Ambient temperature (C)
Ambient temperature (C)
VCNT voltage - ICNT current
0.5
Ta=25C
VLED G, R voltage - ILED G, R current
VLED G, R voltage (V)
0.5 0.4 G 0.3 0.2 0.1 0 1 10 R
Ta=25C
VCNT voltage (V)
0.4 0.3 0.2 0.1 0 1 10 100
100
ICNT current (mA)
ILED G, R current (mA)
OSC oscillation cycle - CR
Oscillation cycle (mS)
6 5 4 3 2 1 0 100 120 140 160 180 200 C=0.0047F C=0.022F C=0.01F
Ta=25C
BAT pin reverse current - BAT pin voltage
BAT pin reverse current (A)
0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
OSC resistance R (k)
BAT pin voltage (V)

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