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| MITSUMI Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077 Protection of Lithium Ion/Lithium Polymer Battery(one cell) Monolithic IC MM3077 Outline This protection IC was developed for use with lithium-ion/lithium polymer secondary 1-cell serial batteries. It detects overcharge, overdischarge, discharge overcurrent and other abnormalities, and functions to protect the battery by turning off the external FET-SW. The IC also has a built-in timer circuit (for detection delay times), so fewer external parts can be used in protection circuit configuration. Features (1) High withstand voltage CMOS process used Charger connection absolute maximum rating 28V (2) High electrostatic tolerance 20kV (150pF, 330 aerial, contact discharge) (3) Detection voltage precision Overcharge detection precision 25mV (0 ~ 50C) Discharge overcurrent detection precision 10mV Overdischarge detection precision 58mV (4) Built-in detection delay time (timer circuit) Overcharge detection delay time 0.25 ~ 7.0s (mask option) Overdischarge detection delay time 4.0 ~ 32.0ms (mask option) Discharge overcurrent detection delay time 4.0 ~ 32.0ms (mask option) Short detection delay time 400s (5) Includes detection function for too large charger Detection voltage for too large charger 8.0V (6) Setting DS pin At VDD level allows shortening of overcharge, excess discharge, discharge overcurrent detection and reset delay time. (7) OV charging prohibition function (mask option) Package SOT-26 SON-6 Applications Lithium-ion/lithium polymer battery protection circuits MITSUMI Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077 Block diagram VDD 2 DS 4 Oscillator VD1 Counter Logic Circuit Over-charge Delay VD2 Over-discharge VD3 Level Shift Short Logic Circuit Over-discharge Current 3 VSS 1 DOUT 5 COUT 6 V- Pin Assignment DOUT VDD VSS 1 2 3 6 5 4 V- COUT DS 1 2 3 4 5 6 DOUT VDD VSS DS COUT V- Pin Description Pin No. Pin Name 1 2 3 4 5 6 DOUT VDD VSS DS COUT V- VDD terminal. Connected to IC substrait. VSS terminal. Connected to IC ground. Delay shorten terminal. Over charge detection Output. Output type is CMOS. Charger negative voltage input. Function Over discharge detection Output. Output type is CMOS. MITSUMI Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077 Absolute maximum ratings Item Supply voltage Charger minus pin input voltage DS pin input voltage COUT pin output voltage DOUT pin output voltage Operating temperature Storage temperature (TOPR=25C, VSS=0V) Symbol VDD V- VDS VCOUT VDOUT TOPR TSTG Rating -0.3 ~ 12 VDD-28 ~ VDD+0.3 VSS-0.3 ~ VDD+0.3 VDD-28 ~ VDD+0.3 VSS-0.3 ~ VDD+0.3 -40 ~ +85 -55 ~ +125 Unit V V V V V C C Electrical characteristics Parameter Operating input voltage Minimum operating voltage for 0V charging Over-charge detection voltage Over-charge release voltage Over-charge release delay time Over-discharge detection voltage Over-discharge detection delay time Over-discharge release delay time Over-discharge current detection voltage Over-discharge current release delay time Short detection voltage Short detection delay time Over-discharge current release resistance DS pin "H"input voltage DS pin pull-down resistance COUT pin Nch ON voltage COUT pin Pch ON voltage DOUT pin Nch ON voltage DOUT pin Pch ON voltage Current consumption Current consumption at stand-by Over voltage charger detection voltage Over voltage charger release voltage (TOPR=25C) Conditions VDD-VSS VDD-V-, VDD-VSS=0V R1=330 TOPR=0 ~ 50C, *1 VDD=3.6V VDD=4.4V VDD=3.6V 4.4V 3.6V 2.2V 0V 1V 0V 3V R1=330 Detect falling edge of supply voltage VDD=3V, V-=3V VDD=3V, V-=0V VDD=3V, V-=3V VDD=3V VDD=3V, V-=0V VDD=3.6V, V-=1V VDD=3.6V IOL=50A, VDD=4.5V IOH=50A, VDD=3.9V IOL=50A, VDD=2.0V IDD=50A, VDD=3.9V VDD=3.9V, V-=0V VDD=2.0V VDD=3.6V VDD=3.6V 6.0 5.3 8.0 7.3 3.4 3.4 0.7 5.6 16.8 2.8 8.4 2.8 250 30 VDD-0.5 6.5 13.0 0.4 3.7 0.2 3.7 3.0 6.0 0.1 10.0 9.3 0.5 1.0 8.0 24.0 4.0 12.0 4.0 400 50 min. 1.5 typ. max. 10.0 1.2 4.275 4.300 4.325 1.3 10.4 31.2 5.2 15.6 5.2 600 100 VDD+0.3 26.0 0.5 4.050 4.100 4.150 2.242 2.300 2.358 Unit V V V s V ms V ms ms V ms ms V s k V k V V V V A A V V *2 A A B B B B D D E F F F F F F H H I J K L M M G G Symbol VDD1 VST VDET1 VREL1 tVREL1 VDET2 tVDET2 tVREL2 VDET3 tVREL3 VSHORT tSHORT RSHORT VIH RDS VOL1 VOH1 VOL2 VDD2 IDD IS VCHG1 VCHG2 Over-charge detection delay time tVDET1 Detect falling edge of supply voltage 0.140 0.150 0.160 Over-discharge curent detection delay time tVDET3 VDD-1.2 VDD-0.9 VDD-0.6 *1 The parameter is guaranteed by desing. *2 The test circuit symbols on next page. MITSUMI Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077 Test circuit A 2 VDD V H DOUT 1 COUT 5 OSCILLOSCOPE 2 VDD 6 V- DOUT 1 COUT 5 DS 4 A OSCILLOSCOPE 6 V- V 3 VSS 3 VSS DS 4 V B 2 VDD 6 V- V I DOUT 1 COUT 5 DS 4 OSCILLOSCOPE 2 VDD 6 V- 3 VSS DOUT 1 COUT 5 DS 4 A V 3 VSS C 2 VDD 6 V- 3 VSS DOUT 1 COUT 5 DS 4 OSCILLOSCOPE J 2 VDD 6 V- 3 VSS DOUT 1 COUT 5 DS 4 A V D 2 VDD 6 V- V K DOUT 1 COUT 5 DS 4 OSCILLOSCOPE 2 VDD 6 V- 3 VSS DOUT 1 COUT 5 DS 4 A V 3 VSS E 2 VDD 6 V- 3 VSS DOUT 1 COUT 5 DS 4 OSCILLOSCOPE L 2 VDD 6 V- 3 VSS DOUT 1 COUT 5 DS 4 A V F 2 VDD A V DOUT 1 COUT 5 DS 4 OSCILLOSCOPE M 2 VDD A DOUT 1 COUT 5 DS 4 6 V- 3 VSS 6 V- 3 VSS G 2 VDD 6 V- V DOUT 1 COUT 5 DS 4 OSCILLOSCOPE 3 VSS MITSUMI Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077 Description 1. Over charge detection circuit (VD1) This IC monitor VDD pin voltage, when the voltage of VDD pin cross overcharge detection voltage (4.30V typ.) from a low value higher than the overcharge detection voltage, the IC sense a overcharging and external charging control Nch MOS FET turns to OFF with COUT pin being low level. After detecting overcharge when the VDD pin voltage is coming down to a level lower than overcharge release voltage (4.10V typ.) external charging control Nch MOS FET turns to ON with COUT pin being high level. After detecting overcharge in the VDD pin voltage, connecting system load to the battery charger makes load current allowable supplied to parasitic diode of charging control FET. The COUT pin level would be high when the VDD pin level is coming down to a level below the overcharge detection voltage by continuous sending a load current. There are delay time set in IC when the overcharge and the overcharge release are detected. When the VDD level is going up to a higher level than overcharge detection voltage if the VDD voltage would be back to a level lower than the overcharge detection voltage within a time period of the over charge release delay time (1.0s typ.). The overcharge detection does not release when returning to former state in the overcharge release dead time (8ms typ.) even if the load is connected after the charger is removed when the VDD pin voltage is lower than the overcharge release voltage with the overcharge detected. A level shifter incorporated in a buffer drive for the COUT to the V-pin voltage and the high level of COUT is set to VDD voltage with CMOS buffer. 2. Over discharge detection circuit (VD2) This IC monitors VDD pin voltage, and when the voltage crosses the overdischarge detection voltage (2.30V typ.) from high value to a value lower than the overdischarge detection voltage, this IC sense an overdischarge and an external discharging control Nch MOS FET turns to OFF with DOUT pin being at low level. The release from the overdischarge is done only by connecting the charger. Charging current is supplied through a parasitic diode of Nch MOS FET when the VDD pin voltage is below the overdischarge detection voltage to the connection of the charger, and the DOUT pin enters the state which can be discharged by becoming high level,and turning on Nch MOS FET when the VDD pin voltage rises more than the overdischarge detection voltage. The COUT pin becomes high level and charging current is supplied if the voltage of the charger is more than the maximum value of 0V charging lowest operating voltage when the voltage of the battery is 0V. An output delay time for the overdischarge detection is fixed internally (8ms typ.). When VDD pin voltage becomes lower the over discharge detection voltage if VDD pin higher more than the over discharge detection voltage in delay time even does not enter the over discharge detection mode. Moreover, when the over discharge release,delay time is set (4ms typ.). All the circuits are stopped, and after the overdischarge is detected, it is assumed the state of the standby, and decreases the current (standby current) which IC consumes as much as possible (The VDD =2V 0.1A max.). The output type of DOUT pin is CMOS having high level of VDD and low level of VSS . MITSUMI Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077 3. Discharging over current detector,Short detector (VD3, Short Detector) When the V-pin voltage is going up to a value during the short detection voltage (VDD-0.9V typ.) and overdischarge current detection voltage (0.150V typ.) is overdischarge current detection mode, when the V-pin voltage higher than short detection voltage makes the short detection mode. This leads the external discharge control Nch MOS FET turns to OFF with the DOUT pin being at low level. An output delay time for the overdischarge current detection is fixed internally (12ms typ.). When V-pin voltage becomes during the over discharge current detection voltage and the short circuit detection if V-pin lowers more than the over discharge current detection voltage in delay time even does not enter the over discharge current detection mode. Moreover,when the over discharge current release, delay time is set (4ms typ.). The delay time set in IC exists when the short circuit is detected (400s typ.). The over discharge current release resistance (100k typ.) is built into between V-pin and VSS pin. When the load opened after detecting the over discharge current or the short circuit, V-pin is pulled down to the VSS through the over discharge current release resistance, And IC returns automatically from the over discharge current or the short circuit detection mode when V-pin voltage becomes below the over discharge current detection voltage. When the over discharge current or the short circuit is detected, the over discharge current release resistance is turned on. The over discharge current release resistance is usually turned off. 4. DS (Delay Shortening)function The overcharge, the over discharge, the over discharge current detection, and the delay time when returning can be shortened by impressing the VDD voltage level to the terminal DS. In the DS pin, the pull-down resistance of 13k is connected between VSS. Please connect VSS or open the DS pin when using usually. MITSUMI Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077 Application Circuit + R1 330 2 VDD 4 DS Oscillator VD1 Logic Circuit Counter MM3077 Level Shift C1 0.1F VD2 VD3 Delay Short Logic Circuit VSS 3 DOUT COUT 1 5 V- 6 R2 1k - Application hints R1 and C1 stabilize a supply voltage to the MM3077. However, the detection voltage rises by the current of penetration in IC of the voltage detection when R1 is enlarged, and the value of R1 is adjusted to 1k or less. Moreover, please adjust the value of C1 to 0.01F or more to do the stability operation. R1 and R2 are current limit resistance if a charger is connected reversibly or a high-voltage charger that exceed the absolute maximum rating is connected. R1 and R2 may cause a power consumption will be over rating of power dissipation therefore the R1+R2 should be more than 1k. Moreover, the charger connection release after the overedischarge is detected cannot be occasionally done when R2 is enlarged, and adjust the value of R2 to 10k or less, please. MITSUMI Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077 Timing chart 1 Over-charge operations Connect Charger Connect Load Connect Charger Connect Load VDD VDET1 VREL1 t V- VDD VDET3 VSS t tVDET1 tVDET1 COUT VDD tVREL1 tVREL1 V- ICHARGE t 0 t IDISCHARGE MITSUMI Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077 Timing chart Over-discharge, over-discharge current, short operations Over-discharge Current Connect Charger Open Connect Load Connect Charger Connect Load Short Open VDD VDET2 t V- VDD VSHORT VDET3 VSS t tVDET2 tVDET2 tVDET3 tSHORT DOUT VDD tVREL2 VSS tVREL2 tVREL3 tVREL3 t ICHARGE 0 t IDISCHARGE |
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