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MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Lithium Ion Battery Protection (for 1-cell in series)
Monolithic IC MM1446
Outline
This IC is a lithium ion battery protection IC that adds control using a fuse to the method of overcurrent detection control used in the familiar MM1301 series. An OSI pin (charge control pin) also has been provided.
1-Cell Protection ICs
Package Model VSOP-8B BW CW DW EW
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)
Overcharge detection voltage (V)
MM1446
4.2700.030 4.2700.030 4.1800.030 4.2800.030
C C C C
10030 10030 11030 11030
2.550.05 2.550.05 2.500.05 2.500.05
3.70 3.70 3.100.078 3.100.078
39.04.5 52.04.5 39.04.5 39.04.5
The series * Overchargewill continue to be expanded. and overcurrent detection voltage can voltages * be changed and overdischargerequest. at the customer's
Features
1. Overcharge detection voltage Ta = 0 ~ +50C VCEL 30mV 2. Overcharge detection dead time CTD = 0.1F 1.0 sec 3. Consumption current (normal mode VCEL = 3.5V) 14A typ. 0.2A typ. 4. Consumption current (overdischarge mode VCEL = 1.9V) 5. Overcurrent protection release Load open: between both ends of battery pack load of 500M or higher
Package
VSOP-8B
Applications
Lithium ion battery packs (for battery protection)
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Block Diagram
*1: Over-discharge detection voltage *2: Over-charge detection voltage
Pin Assignment
1 2 8 7 6 5 3 4 1 2 3 4 5 6 SOP-8B 7 8 GND CS1 GD CS2 OC2 TD OC1 VCC
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Pin Description
PIN No. PIN Name 1 GND Function Negative power supply for this IC. Also act as detection voltage pin for the battery connected between Vcc-GND. Detection pin for voltage between CS1-GND. When CS1 is connected with the Source of discharge FET, Detects overcurrent using an external resistor and discharge current. When CS1 is connected with CS2(4PIN), and connects with the Dorein of charge and discharge FET, Detects overcurrent using an On state resistor of discharge control FET and discharge current. Dischage Current=CS1-GND Voltage / External Resistor CS1-GND Voltage / On state resistance of discharge control FET N-ch FET gate connection pin for discharge control. Switchesgate OFF when overdischarge is detected, and for current protection. Swicthes gate ON when overcharge is detected, and in normal state. Detection pin for overcurrent mode release and start-up voltage. Detected load release resets from overcurrent mode. When the battery is being charged and the Voltage between CS2-GND during overdischarge mode falls bellow start-up voltage, the bias current is drained to the interior circuit and operating status result. Control pin for N-ch FET for charge control. Switches FET OFF by activating an external transistor when overcharge is detected. This operation continues until the voltage falls bellow overcharge release voltage. Overcharge detection dead time setting pin. = TARAM .. 10.0 CTD (sec) CTD: TD pin external capacitance value (F) Overcharge detection output (input) pin. For overcharge detection, output goes high without dead time set by TD pin. (Hysteresis does not go on until OC2 output goes high.) Charging control FET is turned off by the OC2 pin when OC1 pin input is high. Positive power supply for this IC. Also act as detection voltage pin for the battery connected between Vcc-GND.
2
CS1
3
GD
4
CS2
5
OC2
6
TD
7
OC1
8
VCC
Overcharge Mode : Battery Voltage > Overcharge Det. Voltage Nomal Mode : Overdischarge Det. Voltage < Battery Voltage < Overcharge Det. Voltage Discharge Current < Overcurrent Det. Voltage / External Det. resistor Overdischarge Mode : Overdischarge Det. Voltage > Battery Voltage Overcurrent Mode : Discharge Current > Overcurrent Det. Voltage / External Det. Resistor
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Absolute Maximum Ratings
Item Storage temperature Operating temperature Supply voltage OC1 Terminal Voltage CS1 Terminal Voltage OC2 Terminal Voltage CS2 Terminal Voltage Allowable loss
(Ta=25C) Symbol TSTG TOPR VCC max. VOC1 max. VCS1 max. VOC2 max. VCS2 max. PD Ratings -40~+125 -20~+70 -0.3~+12 -0.3~VCC -0.6~VCC 170 (Alone) Unit C C V V V mW
Recommended Operating Conditions
Item Operating Temperature Supply Voltage Symbol TOPR VOP Ratings -20~+70 +0.9~+12 Unit C V
Electrical Characteristics
Item Current Consumption 1 (Overcharge Mode) Current Consumption 2 (Nomal Mode) Current Consumption 3 (Overdischarge Mode) Current Consumption 4 (Overdischarge Mode) Current Cosumption 5 (OC1 Output) Overcharge Detection Voltage Overcharge Release Voltage Overcharge Hysteresis Voltage Overdischarge Detection Voltage Overdischarge Resumption Voltage
(Unless otherwise specifiedTa=25C, model name MM1446E) Measurement Conditions VCC=4.5V ROC1, OC2= VCC=3.5V VCC=1.9V VCC=1.9V (Ta=70C) Min. Typ. Max. Unit 150 14 0.2 0.5 250 20 0.5 0.8 A A A A
Symbol ICC1 ICC2 ICC3 ICC4 ICC5 VALM VALML VALM VOD VODF
Start-up Voltage Overcurrent Detection Voltage Overcurrent Protection Release
VST VCS1
VCC=4.5V, VTD=0V 45 A ROC1= Ta=0C ~ 50C 4.250 4.280 4.310 V VCC=4.0V 4.5V, VOC1, 2 : L H VCC=4.5V 4.0V, VOC1, 2 : H L 4.120 4.170 4.220 V VALM-VALML 80 110 140 mV VCC=3.0V 2.0V 2.45 2.50 2.55 V VGD : H L VCC=2.0V 4.0V 3.022 3.10 3.178 V VGD : L H (*1)(VCC>Overdischarge Release Voltage) or (Charge and VCC>Overdischarge detection voltage.) VCC=2.7V -0.4 -0.1 V VCS2 : 0V -0.5V, VGD : L H VCS1 : 0V -0.2V, 34.5 39.5 43.5 mV VGD : H L Load release (500MEG min.)
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Item Overdischarge Detection Delay Time Overcurrent Detection Delay Time 1 Overcurrent Detection Delay Time 2 Overcharge Detection Delay Time 1 Overcharge Detection Delay Time 2 Operating Limit Voltage ( 2) GD Terminal Output Voltage H GD Terminal Output Voltage L1 GD Terminal Output Voltage L2
Symbol tOD
tCS1
tCS2
tALM1
tALM2 VOP VGDH VGDL1 VGDL2 IOC1 IOC2
*
Measurement Conditions VCC=3.0V 2.0V ( 1), VGD : H L CIRCUIT2, SW1 : a, SW2 : b, SW3 : b VCS1=0V 0.2V ( 1), VGD : H L CIRCUIT2, SW1 : a, SW2 : b, SW3 : b VCS2=0V 1.0V ( 1) , VGD : H L CIRCUIT2, SW1 : b, SW2 : a, SW3 : b VCC=4.0V 4.5V ( 1) , CTD=0.1F, VOC2 : L H CIRCUIT2, SW1 : a, SW2 : b, SW3 : b VCC=4.0V 4.5V ( 1) , VOC1 : H L CIRCUIT2, SW1 : a, SW2 : b, SW3 : b VCC when VGDL2>0.4V
Min. Typ. Max. Unit 5.0 10.0 15.0 ms
*
*
5.0
10.0
15.0
ms
*
100
s
* *
0.5
1.0
1.5
s
100 1.2 VCC-0.3 VCC-0.1 0.1 0.2 0.3 0.4 -30 -500
s V V V V A A
OC1 Terminal Output Current OC2 Terminal Output Current
VCS2>1.0V VCC=1.5V VCC=4.5V, VOC1=1.6V CIRCUIT1, SW1 : b, SW2 : a VCC=4.5V, VOC1=0V CIRCUIT1, SW1 : a, SW2 : b
( 1) Refer to input waveforms. ( 2) Operation is unstable below the operating limit voltage.
* *
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Measuring Circuit
Measuring Circuit 1
Measuring Circuit 2
Note :
0.2V VCS1 0V VGD tCS VGD tOD VGD tALM 1V/100s 3.0V VCC 2.0V VOD 4.5V VCC 4.0V 1V/100s VALM
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Timing Chart
Charge Normal mode Normal mode Over discharging mode
Charging prohibited mode Discharging prohibited mode
Charge Over current protection mode Normal mode Normal prohibited mode mode
Discharging
Charge Over current protection mode Normal mode Normal mode Over current protection mode
Discharging prohibited mode
VCC
VALM VALML VDDF VDO OV
GD
OV TOO TCS TOO TCS TCS
TD
OV
OC1
OV
OC2
OV TALM2 Undecided Undecided Undecided Load release Undecided Undecided Load release Load release
Undecided
CS1 CS2
Undecided VCS OV Undecided (VCS2) OV VSr
Application Circuits
(1) Example using shunt resistance to detect overcurrent.
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
(2) Example using discharge FET on resistance to detect overcurrent.
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.
Supply current vs supply voltage
50
Overcharge detection time (deat time)
10
40
Overcharge detection time (sec.)
Supply current (ICC) (A)
1
30 ICC
20
0.1
10
0
1.0
2.0
3.0
4.0
5.0
0.01 0.01
0.1
1.0
Supply voltage (VCC) (V)
External capacitance (CTD) (F)
Note: The above specifications are representative, and are not guaranteed values.

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