Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414 MITSUMI Protection for Lithium-Ion Batteries (3-/4-serial cells) Monolithic IC MM1414 April 14, 1999 Outline Temperature conditions A: Ta=-25 ~ 75C, B: Ta=-20 ~ 70C, C: Ta=0 ~ 50C, D: Ta=0 ~ 40C, E: Ta=-20 ~ 25C du c Series Table ts This IC protects lithium-ion batteries in the event of overcharge, overdischarge and overcurrent. It has the following two functions: an overcharge detection function that turns the external FET-SW off when a problem occurs during charging, etc. and excess voltage is impressed on each battery for longer than a certain time, and an overdischarge detection function that turns the external FET-SW off when battery voltage drops below a certain voltage during discharge, in order to prevent battery overdischarge. When these functions operate, the IC enters low current consumption mode. It also has an overcurrent detection function that turns the FETSW off when excess current flows due to a short or the like. Since the functions above are provided, the protection circuitry for lithium-ion batteries can be comprised with fever external components. Overcharge detection voltage temperature conditions Overcharge detection hysteresis voltage (V) AV CV DV FV GV 4.3500.025 4.3500.025 4.2500.025 4.3250.025 4.2950.025 C C C C C 20060 20060 20060 20060 88 Features ut Ph as ed MM1414 Overdischarge Overdischarge Overcurrent detection resumption detection voltage (V) voltage (V) voltage (mV) 2.000.10 2.300.10 2.300.10 2.300.10 2.300.10 3.000.15 3.000.15 3.000.15 3.000.15 3.000.15 O Model Pr o TSOP-20A Overcharge detection voltage (V) Package 1. Consumption current (during overcharge) 2. Consumption current (normal) 3. Consumption current (during overdischarge) 4. Consumption current (during overdischarge) 5. Overcurrent release conditions Package TSOP-20A Applications Lithium-ion battery packs for note PCs VCELL = 4.4 CON = 0V 55A typ. VCELL = 3.5V CON = 0V 15A typ. VCELL = 1.9V CON = 0V 0.5A typ. VCELL = 1.0V CON = VCC 0.1A max. A, C, D, G; Load open 500k or more F; Load open 1MEG or more 15015 15015 15015 10015 15015 Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414 MITSUMI Pin Assignment 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 OV 11 SEL 2 N.C 12 N.C 3 CS 13 CON 4 N.C 14 N.C 5 DCHG 15 V1 6 N.C 16 V2 7 CDC 17 V3 8 COL 18 V4 9 COV 19 N.C 10 GND 20 VCC ts TSOP-20A 1 Ph as ed O ut Pr o du c Block Diagram Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414 MITSUMI Pin Description Pin No. Pin name I/O Functions Overcharge detection output pin 1 OV Output NPNTr open collector output Normal: high impedance Overcharge: Low 2 N.C Overcurrent detection pin Monitors load current equivalently by the voltage drop between discharge control 3 CS Input FET source and drain, and makes DCHG pin high when the voltage goes below overcurrent detection voltage, turning off discharge control FET. After overcurrent detection, current flows from this pin and when there is a light load, N.C du c 4 ts overcurrent mode is released. This function does not operate in overdischarge mode. Discharge control FET (P-ch) drive pin DCHG Output Normal: Low Overdischarge: High CDC Input 8 COL Input 9 COV Input 10 GND Input 11 SEL Input 12 N.C Overdischarge detection dead time setting pin Dead time can be set by connecting a capacitor between CDC pin and ground. ut 7 Overcurrent detection dead time setting pin Dead time can be set by connecting a capacitor between COL pin and ground. O N.C Overcharge detection dead time setting pin Dead time can be set by connecting a capacitor between COV pin and ground. Ph as ed 6 Pr o 5 GND pin 3 cell switch pin SEL pin = GND: 3 cell (Connect V1 to GND) SEL pin = VCC: 4 cell Discharge FET ON/OFF pin 13 CON Input CON pin low; DCHG pin low (Normal mode) CON pin high; DCHG pin high (Discharging prohibited) 14 N.C 15 V1 Input V1 cell high side voltage input pin 16 V2 Input V2 cell high side voltage and V3 cell low side voltage input pin 17 V3 Input V3 cell high side voltage and V4 cell low side voltage input pin 18 V4 Input V4 cell high side voltage input pin 19 N.C 20 VCC Input Power supply input pin Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414 MITSUMI Pin Description Pin Equivalent circuit diagram Pin Equivalent circuit diagram 1 ; OV 9 ; COV Pr o du c 11 ; SEL ts 3 ; CS 7 ; CDC 13 ; CON Ph as ed O ut 5 ; DCHG 15 ; V1 8 ; COL 16 ; V2 Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414 MITSUMI Pin Equivalent circuit diagram Pin 17 ; V3 Equivalent circuit diagram 18 ; V4 Symbol Ratings Unit Storage temperature TSTG -40~+125 C Operating temperature TOPR Power supply voltage VCC max. OV pin impressed voltage VOV max. SEL pin impressed voltage ts Item du c Absolute Maximum Ratings C -0.3~24 V -0.3~24 V VSEL max. -0.3~24 V CON pin impressed voltage VCON max. -0.3~24 V Allowable loss Pd 300 mW O ut Pr o -20~+70 Ph as ed Recommended Operating Conditions Item Symbol Ratings Unit Operating temperature TOPR -20~+70 C Operating voltage VOPR +1.8~+24 V Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414 MITSUMI Electrical Characteristics (Except where noted otherwise, Ta=25C, VCC=V4+V3+V2+V1, VCEL=3.5V, CON=GND, SEL=VCC) Models listed MM1414G Symbol Measurement conditions Consumption current (VCC pin) 1 ICC1 VCELL=4.4V, CON=0V 55 110 A Consumption current (VCC pin) 2 ICC2 VCELL=3.5V, CON=0V 27 50 A Consumption current (VCC pin) 3 ICC3 VCELL=1.8V, CON=0V 2 4 A Consumption current (VCC pin) 4 ICC4 VCELL=3.5V, CON=VCC 12 20 A Consumption current (VCC pin) 5 ICC5 VCELL=1.8V, CON=VCC 1 2 A Consumption current (V4 pin) 1 I1V4 VCELL=4.4V 10 20 A Consumption current (V4 pin) 2 I2V4 VCELL=3.5V 8 15 A Consumption current (V4 pin) 3 I3V4 VCELL=1.8V 2.5 5.0 A V3 pin input current IV3 VCELL=3.5V -300 0 +300 nA V2 pin input current IV2 VCELL=3.5V -300 0 +300 nA V1 pin input current IV1 VCELL=3.5V 0 +300 nA Overcharge detection voltage VCELLU 4.270 4.295 4.320 V 8 16 mV 0.5 1.0 1.5 s tOV Overdischarge detection voltage VCELLS Discharge resume voltage VCELLD VDS Overdischarge sensing dead time tCDC Overcurrent detection voltage VOC VOC Overcurrent sensing dead time 1 tCOL1 Ph as ed Overcurrent hysteresis voltage 4.4V 3.9V COV=0.1F O Overdischarge hysteresis voltage VCELL : 4.2V Pr o Overcharge sensing dead time 4.4V, Ta=0~50C du c VU -300 VCELL : 3.5V 1.8V 2.20 2.30 2.40 V VCELL : 1.8V 3.5V 2.85 3.00 3.15 V VCELLD-VCELLS 0.45 0.70 0.95 V CDC=0.1F 0.5 1.0 1.5 s VCC-VCS, DCHG 135 150 165 mV 20 40 mV 10 15 ms 1.5 3.0 ms 10 15 ms ut Overcharge hysteresis voltage VCELL : 4.2V Min. Typ. Max. Unit ts Item COL=0.001F Overcurrent sensing dead time 2 tCOL2 COL=0.001F, VCC-CS>1.0V Overcurrent sensing dead time 3 tCOL3 COL=0.001F Overcurrent reset conditions 5 5 Load release conditions 500k DCHG pin source current ISODCH VCELL=1.8V, SW1 : A VDCHG=VCC-0.8V 20 A DCHG pin sink current ISIDCH VCELL=3.5V, SW1 : A VDCHG=0.8V 20 A DCHG pin output voltage H VTHDCH VCC-VDCHG, ISO=20A, SW1 : B 0.8 V DCHG pin output voltage L VTHDCL VDCHG-GND, ISI=-20A, SW1 : B 0.8 V OV pin sink current ISIOV VOV=0.4V, Ta=-20~+70C OV pin leak current ILKOV VOV=24V 0.1 A CON pin L voltage DCHG= "High" 0.4 V CON pin H voltage DCHG= "Low" CON pin current VCELL=3.5V, CON=0.4V SEL pin L voltage for 3 cell SEL pin H voltage for 4 cell SEL pin current VCELL=3.5V, SEL=0.4V 100 A VCC-0.4 V 1 2 A 0.4 V VCC-0.4 V 1 2 A Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414 MITSUMI Timing Chart O ut Pr o du c ts Measuring Circuit Ph as ed For overcharge Charge OFF Overcharge detection voltage Cell voltage Overcharge release voltage COV pin Sensing dead OV pin (for pull up) Normal state Overcharge Normal state Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414 MITSUMI For overdischarge Discharge OFF Charge start Discharge resume voltage Overdischarge Cell voltag detection voltage CON pin Sensing dead DCHG pin Normal state For overcurrent Overdischarge Normal state Normal state Normal state O External control ut Normal state Pr o du c ts CDC pin Ph as ed Overcurrent Load release Current flows from CS pin CS pin COL pin Sensing dead Reset dead DCHG pin Normal state Overcurrent Normal state Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414 MITSUMI ts Application Circuit du c Note: Applicable circuits shown are typical examples provided for reference purposes. Mitsumi cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. Overcharge & Overdischarge Sensing Dead Times Pr o Characteristics Overcurrent Sensing Dead Time 1, Overcurrent Reset Dead Time 3 100 0.1 0.01 0.001 0.01 0.1 1 Pin capacitance (F) Dead time (ms) O 1 Ph as ed Dead time (S) ut 10 10 1 100 1000 COL pin capacitance (pF) Overcurrent Sensing Dead Time 2 Overcurrent Sensing Dead Time 2 (ms) 100 10 1 0 100 1000 10000 COL pin capacitance (pF) Note: The above characteristics are representative values only, and are not guaranteed. 10000