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MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Lithium Ion Battery Protection (for 1-cell in series)
Monolithic IC MM1491
Outline
This IC is a smaller, higher precision type of lithium ion battery protection IC as compared to the MM1301 series, and precision of 25mV is guaranteed at 0C ~ 50C. MM1301 had both VCC and VIN pins, but MM1491 has only the VCC pin. Temperature conditions A:Ta=-25 ~ 75C, B:Ta=-20 ~ 70C, C:Ta=0 ~ 50C, D:Ta=0 ~ 40C, E:Ta=-20 ~ 25C
Overcharge detection voltage temperature conditions Overcharge detection hysteresis voltage (V) Overdischarge Overdischarge Overcurrent detection resumption detection voltage (V) voltage (V) voltage (mV)
1-Cell Protection ICs
Package Model SOT-26A AN BN GN HN JN MN SN WN YN ZN
Overcharge detection voltage (V)
MM1491
4.2000.025 4.3500.025 4.2800.025 4.2000.025 4.2500.025 4.2500.025 4.2950.025 4.3250.025 4.3000.025 4.3250.025
C C C C C C C C C C
200100 200100 200100 200100 200100 150100 150100 200100 150100 200100
2.30.1 2.40.1 2.30.1 2.30.1 2.30.1 2.40.1 2.40.1 2.50.1 2.40.1 2.50.1
3.000.12 3.000.12 2.900.12 3.900.12 3.000.12 3.000.12 3.000.12 3.000.12 3.000.12 3.000.12
20026 20026 12016 20026 20026 15020 15020 20026 15020 20026
The series * Overchargewill continue to be expanded. and overcurrent detection voltage can be changed at the and overdischarge voltages * customer's request.
Features
1. Overcharge detection voltage Ta = 0 ~ +50C VCEL 25mV 100 ms 2. Overcharge detection dead time CTD = 0.01F 10A typ. 3. Consumption current (normal mode VCEL = 3.6V) 0.05A typ. 4. Consumption current (overdischarge mode VCEL = 1.9V) 5. Overcurrent detection reset conditions Load open: between both ends of battery pack 50M typ. load
Package
SOT-26A
Applications
Lithium ion battery packs (for battery protection)
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Block Diagram
*1: Over-discharge detection voltage *2: Over-charge detection voltage
Pin Assignment
1 2 6 5 4 3 4 1 2 3 5 6 SOT-26A VM VCC TD CO GND DO
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Pin Description
PIN No. PIN Name 1 2 3 VM VCC TD TERMINAL EXPLANATIONS Overcurrent detection input pin. Detects discharge current by connection to charging control FET source pin. Discharge current = (voltage between VM and GND) / (FET 2 ON resistance) The positive source pin of this IC and connecting the positive terminal of the cell. Setting the dead time of over-charge detection with the outer capacitor. This pin drives the gate of the charge control N-ch FET, needs to connect resistor between source and gate of FET. Over-charge mode (when charging) : FET OFF Over-charge mode (when discharging) : FET ON Over-discharge mode (when discharging) : FET OFF Over-discharge mode (when charging) : FET ON Normal mode : FET ON The ground pin of this IC and connecting the negative terminal of the cell. This pin drives the gate of the discharge control N-ch FET. Over-discharge mode : FET OFF Over-discharge current mode : FET OFF Over-charge mode : FET ON Normal mode : FET ON
4
CO
5
GND
6
DO
* *Overcharge mode: *Normal mode: * *
Battery voltage > overcharge detection voltage Overdischarge detection voltage < battery voltage battery voltage Overcurrent mode: Discharge current > overcurrent detection level, voltage between VM and GND = discharge current FET ON resistance (discharge/charge control FET)
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Pin Description
Pin No. Pin name 1 VM Equivalent circuit diagram Pin No. Pin name 5 GND Equivalent circuit diagram
6 2 4 VCC CO
DO
3
TD
Absolute Maximum Ratings
Item Storange temparature Operating temparature Supply voltage Pin voltage Allowable loss
(Ta=25C) Symbol TSTG TOPR VCC max. VCO max. VVM max. PD Ratings -40~+125 -20~+70 -0.3~+18 VCC-28~VCC 200 Unit C C V V mV
Recommended Operating Conditions
Item Operating tempareture Supply voltage Symbol TOPR VOP Ratings -20~+70 +1.8~+10 Unit C V
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Electrical Characteristics
Item Current consumption 1 (Condition : SET) Current consumption 2 (Condition : IC only) Current consumption 3 (FET : OFF on SET) Current consumption 4 (FET : OFF on SET) Current consumption 5 (Condition : SET) Over-charge voltage Over-charge hysterisis Over-discharge voltage Release over-discharge mode Over-current detect level Release over-current level Condition of release over-current mode Short detect level Over-discharge dead time Over-current dead time Short detect delay time Over-charge dead time DO pin low level DO pin source current 1 DO pin source current 2 DO pin sink current 1 DO pin sink current 2 CO pin source current 1 CO pin source current 2 Start trigger voltage Over-voltage charger protection OV charge minimum voltage
(Unless otherwise specified Ta=25C, VCC=3.6V, model name MM1491B) Measurement Conditions VCC=3.6V : Set between CO-GND : 910k connected VCC=3.6V : IC only between CO-GND : 910k connected VCC=3.6V : Discharge FET OFF between CO-GND : 910k no connected VCC=1.9V : Discharge FET OFF between CO-GND : 910k no connected VCC=4.5V between CO-BG : 910k connected Ta=0C ~ 50C VCC : L VCC : H VCC : H VVM : L VVM : H H L L H L 0.05 35 0.3 60 Min. Typ. Max. Unit 10.0 6.0 14.0 10.0 A A A A A V mV V V mV mV M V 15.0 15.0 0.20 150 VCC -30 ms ms ms ms V A A A A -10 -5 0 -3.0 3.0 A A V V V
Symbol ICC1 ICC2 ICC3 ICC4 ICC5 VALM1 VALM1 VALM2 VVMD VVMDF VVMSHT tALM2 tVMD tVMSHT tALM1 VGDH IDOH1 IDOH2 IDOL1 IDOL2 ICO1 ICO2 VST VPRO V0V
4.325 4.350 4.375 100 2.30 2.88 174 200 2.40 3.00 200 130 50 1.3 7.0 10.0 10.0 0.02 50 100 -100 50 30 300 100 -20 -15 -0.2 -1.5 -0.1 -2.5 2.0 VCC-0.3 VCC-0.1 300 2.50 3.12 226
Load condition
VM : 0V VM : 0V
0.5V 2V
7.0
CTD=0.01F VCC=3.6V VDO=VCC-1.0V VDO=VCC-0.3V VVM>1.0V VDO=1.0V VVM>1.0V VDO=0.3V VCO=VCC-1.0V VCO=VCC-0.3V VVM : 0V -0.5V VCC=3.6V, between GND-VM voltage VCC=0V, Charger voltage 2).
-0.40 -0.07
*The overcurrent detection current value is Vvm/ (FET's on resistance
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Measuring Circuit
Measuring Circuit 1
Measuring Circuit 2
Note :
-1V/100s 0.5V or 2V 3.0V 1V/100s
VM
GND
VALM
4.5V
VCC
VDO GND
2.2V
VCC
4.0V GND
DO
GND
t VM
DO CO
GND t DO
t ALM GND
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Timing Chart
Hysterisis
Over - charge voltage
Dead time CELL voltage
Over - discharge voltage Dead time
TD voltage
CO voltage
Dead time
DO voltage
VM voltage
GND level Excess dischrage current mode Excess discharge mode Discharge mode Charge mode
Charge mode
Discharge mode
Application Circuits
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.
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Application Description
Outline The MM1491 Series are protection IC for over-charge, over-discharge and over-current of rechargeable onecell Lithium-ion, further include a short circuit protector for preventing large external short circuit current.
Parts List * R1 : 100 * C1 : 1F * R2 : 4.7k * C2 : 0.047F * RCO : 2.2M * CTD : 0.1F/Temp. chr. code B (* CC1 : 0.1F/25V) (* CC2 : 0.1F/25V) (* CC3 : 0.1F/25V) 1. Overcharge detection * The overcharge detector monitors VCC pin voltage. When the VCC voltage crosses overcharge detector threshold VALMI (4.2V typ.) from a low value higher than the VALMI, the overcharge detector can sense a overcharging and an external charge control Nch-MOS-FET tums to "OFF" with the resister (910k typ.) between the gate (CO pin) and source of FET, then CO pin "OFF". (This resistor makes the CO pin "L". Current flows the resister on normal condition, therefore it makes the resistance value larger because to reduce the consumption current. However it makes resistance value smaller than 2.2M because of relation between leak current of FET and cut-off time of FET by gate-source capacitance. : It changes the resistance value from 910K to 2.2M, the consumption current can be reduced about 2A.)
MITSUMI 2. Overdischarge detector
Lithium Ion Battery Protection (for 1-cell in series) MM1491
* The voltage of VCC (2 pin) is observed when the battery is discharged, and VCC enters the mode of the overdischarge detector under overdischarge detect voltage (2.3V typ.). The electrical discharge is stopped by DO pin (6 pin) outputting "L", and turning off FET for the discharge. * About the release from the mode of overdischarge Battery below the overdischarge detecting voltage through the parasitic diode of discharge FET. The case that VCC becomes more than the release overdischarge detect voltage by charging, from the mode of overdischarge, is turned on the discharge FET. * It is assumed that CO can be assumed to be "H" and charge if the voltage of the charger which connects the charger is over 0V charging minimum operating voltage (2V typ.) at 0V in the voltage of the battery. * The delay time when overdischarge is detected is set internally (10ms typ.). It does not enter the mode of the overdischarge detection when rising more than the overdischarge detecting voltagein delay time even if VCC becomes below the overdischarge detecting voltage. * After overdischarge is detected, all circuit are stopped, and the current which IC consumes is decreased as much as possible. (at VCC=1.9V : 0.05A typ.) Image figure when over-discharge mode
MITSUMI Note on use
Lithium Ion Battery Protection (for 1-cell in series) MM1491
* The power supply change is suppressed by R1 and C1. However, the detecting voltage rises about (current consumptions * resistance) when R1 is enlarged. Uses R1 below 330. * The voltage change of ( -) terminal is suppressed by R2 and C2. Because the case with which the capacity load is connected includes the case that short detection works, the time constant is given to the terminal VM for preventing. Use R2 4.7k fixed, and change C2 and adjust the time constant. R1 and R2 can operate also as a part of current limit circuit against for applying excess charging voltage or for setting cell reverce. * Please note that the case whose time constant of the terminal VM is larger than the time constant of the terminal VCC includes the case which becomes a stand-by state when detecting short according to the impedance of the connected battery. Please set in (R1 * C1) > (R2 * C2) as a standard. = * Please examine the necessity of CC1, CC2, and CC3 respectively to prevent the malfunction and destruction by ESD or the radio wave when you design the module. Please note that MM1421 of the charge release type has the case which enters the stand-by state by the ESD and radio wave etc. because of module patternning. * When measuring over-charge voltage in module, evaluate with the measurement figure. (When the battry has no loads, pack-ocillates if it enters the mode of overcharge detection. Because of the function of load detection.)
Test circuit to measure over-charge detect voltage
Power supply Overcharge detecting voltage
0V -VCF Delay time Charge FET OFF measuring this point PACK
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Dead time vs external capacitor (When overcharge detection)
10
Supply current vs supply voltage
60
Dead time of overcharge detection : tTD (S)
Supply current : ICC (A)
0.01 0.1 1
50 40 30 20 10 0 0 1 2 3 4 5 6
1
0.1
0.01
External capacitor (F)
Supply voltage : VCC (V) (When VCC : H L)
When incleasing cell voltage supply current vs supply voltage
6.0 When voltage release
Supply current : ICC (A)
5.0 4.0 3.0 2.0 1.0 0 0 1 2 3 4 5 6
Supply voltage : VCC (V) (When VCC : H L)
Note: The above specifications are representative, and are not guaranteed values.

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