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general description the HT4301 series product is a high integration solution for lithium-ion/polymer battery protection. HT4301 contains advanced power mosfet, high-accuracy voltage detection circuits and delay circuits. HT4301 is put into an ultra-small sot23-5 package and only one external component makes it an ideal solution in limited space of battery pack. HT4301 has all the protec tion functions required in the battery application including overcharging, overdischarging, overcurrent and load short circuiting protection etc. the accurate overcharging detection voltage ensures safe and full utilization charging. the low standby current drains little current from the cell while in storage. the device is not only targeted for digital cellular phones, but also for any other li-ion and li-poly battery-powered information appliances requiring long-term battery life. applications ? one-cell lithium-ion battery pack ? lithium-polymer battery pack features ? integrate advanced power mosfet with equivalent of 54m rds(on) ? ultra-small sot23-5 package ? only one external capacitor required ? over-temperature protection ? overcharge current protection ? three-step overcurrent detection: -overdischarge current 1 -overdischarge current 2 (optional) -load short circuiting ? charger detection function ? 0v battery charging function delay times are generated inside ? high-accuracy voltage detection ? low current consumption operation mode: 5.0 a typ. power-down mode: 0.1 a max. ? rohs compliant and lead (pb) free HT4301 1 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
ordering information part number pack age overcharge detection voltage [v cu ] (v) overcharge release voltage [v cl ] (v) overdischarge detection voltage [v dl ] (v) overdischarge release voltage [v dr ] (v) overcurrent detection current [i ov1 ] (a) HT4301a sot23-5 4.300 4.10 2.40 3.0 2.5 HT4301b 4.275 4.10 2.50 2.9 3.0 HT4301c 4.325 4.10 2.50 2.9 2.5 HT4301d 4.250 4.10 2.90 3.0 2.5 pin configuration pin description HT4301 pin number pin name pin description 2 gnd ground, connect the negative termin al of the battery to this pin 3 vdd power supply 4.5 vm the negative terminal of the battery pack. the internal fet switch connects this terminal to gnd HT4301 2 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
absolute maximum ratings (note: do not exceed these limits to prevent da mage to the device. expos ure to absolute maximum rating conditions for long periods may affect device reliability.) parameter value unit input voltage between vcc and gnd -0.3 to +6 v vdd input pin voltage -0.3 to vcc+0.3 v vm input pin voltage -6 to 10 v operating ambient temperature -40 to 85 c maximum junction temperature 125 c storage temperature -55 to 150 c lead temperature ( soldering, 10 sec) 300 c power dissipation at t=25c 0.4 w package thermal resistance (junction to ambient) ja 250 c/w package thermal resistance (junction to case) jc 130 c/w electrical characteristics typicals and limits appearing in normal type apply for t a = 25 o c, unless otherwise specified parameter symbol test condition min typ max unit detection voltage overcharge detection voltage v cu v cu -0.050 vcu vcu +0.050 v overcharge release voltage v cl v cl 0.050 vcl vcl +0.050 v overdischarge detection voltage v dl v dl s-0.100 vdl vdl +0.100 v overdischarge release voltage v dr v dr -0.100 vdr vdr +0.100 v charger detection voltage v ch a -0.07 -0.12 -0.2 v detection current overdischarge current1 detection i iov1 v dd =3.5v iiov 1 1.5 iiov1 a overdischarge current 2 detection current (optional) i iov2 v dd =3.5v 6.0 9.0 a load short-circuiting detection i short v dd =3.5v 20 30 a current consumption current consumption in normal operation i ope v dd =3.5v v m =0v 5 a HT4301 3 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
current consumption in power down i pdn v dd =2.0v vm pin floating 0.1 a vm internal resistance internal resistance between vm and vdd r vmd v dd =3.5v v m =1.0v 320 k internal resistance between vm and gnd r vms v dd =2.0v v m =1.0v 100 k fet on resistance equivalent fet on resistance r ds(on) v dd =3.6v i vm =1.0a 54 m over temperature protection over temperature protection t shd+ 120 oc over temperature recovery degree t shd- 100 oc detection delay time overcharge voltage detection delay time t cu 0.125 0.25 0.45 s overdischarge voltage detection delay time t dl 20 40 60 ms overdischarge current 1 detection delay time t iov1 v dd =3.5v 4 8 12 ms overdischarge current 2 detection delay time t iov2 v dd =3.5v 1 2 4 ms load short-circuiting detection delay time t short v dd =3.5v 5 50 us HT4301 4 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
functional description the HT4301 monitors the voltage and current of a battery and protects it from being damaged due to overcharge voltage, overdischarge voltage, overdischarge current, and short circuit conditions by disconnecting the battery from the load or charger. these f unctions are required in order to operate the battery cell within specified limits. the device requires only one external capacitor. the mosfet is integrated and its rds(on) is as low as 54 m typical. normal operating mode if no exception condition is detected, charging and discharging can be carried out freely. this condition is called the normal operating mode. overcharge condition when the battery voltage becomes higher than the overcharge detection voltage (v cu )during charging under normal condition and the state continues for the overc harge detection delay time (t cu ) or longer, the HT4301 turns the charging control fet off to stop charging. this condition is called the overcharge condition. the overcharge condition is released in the following two cases: 1, when the battery voltage drops below the overcharge release voltage (v cl ), the HT4301 turns the charging control fet on and returns to the normal condition. 2, when a load is c onnected and discharging starts, the HT4301 turns the charging control fet on and returns to the normal condition. the release mechanism is as follows: the discharging current flows through an internal parasitic diode of the charging fet immedi ately after a load is connected and discharging st arts, and the vm pin voltage increases about 0.7 v (forward voltage of the diode) from the gnd pin voltage momentarily. the HT4301detects this voltage and releases the overcharge condition. consequently, in the case that the battery voltage is equal to orlower than the overcharge detection voltage (v cu ), the HT4301 returns to the normal condition immediately, but in the case the battery voltage is higher than the overc harge detection voltage (v cu ),the chip does not return to the normal condition until the battery voltage drops below the overcharge detection voltage (v cu ) even if the load is connected. in addition, if the vm pin voltage is equal to or lower than the overcurrent 1 detection voltage when a l oad is connected and discharging starts, the chip does not return to the normal condition. remark if the battery is charged to a voltage higher than the overcharge detection voltage (v cu ) and the battery voltage does not drops below the overcharge detection voltage (v cu ) even when a heavy load, which causes an overcurrent, is connected, the overcurre nt 1 and overcurrent 2 do not work until the battery voltage drops below the overcharge detection voltage (vcu). since an actual battery has, however, an internal impedance of several dozens of m ? , and the battery voltage drops immediately after a heavy HT4301 5 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
load which causes an over current is connected, the overcurrent 1 and overcurrent 2 work. detection of load short-circuiting works regardless of the battery voltage. overdischarge condition when the battery voltage drops below the overdischarge detection voltage (vdl) during discharging under normal condition and it continues for the over discharge detection delay time (tdl) or longer, the HT4301 turns the discharging control fet of f and stops discharging. this condition is called overdischarge condition. after the discharging control fet is turned off, the vm pin is pulled up by the rvmd resistor between vm and vdd in HT4301. meanwhile when vm is bigger than 1.5 v (typ.) (the load short-circuiting detection voltage), the current of the chip is reduced to the power-down current (ipdn). this condition is called power-down condition. he vm and vdd pins are shorted by the rvmd resistor in the ic under the overdischarge and power-down conditions. the power-down condition is re leased when a charger is connected and the pot ential difference between vm and vdd becomes 1.3 v (typ.) or higher (load short-circuiting detection vo ltage). at this time, the fet is still off. when the battery voltage becomes the overdischarge detection voltage (v dl ) or higher (see note), the HT4301 turns the fet on and changes to the normal condition from the overdischarge condition. remark if the vm pin voltage is no less than the charger detection voltage (v cha ), when the battery under overdischarge condition is connected to a charger, the overdischarge condition is released (the discharging control fet is turned on) as usual, provided that the battery voltage reaches the overdischarge release voltage (v du ) or higher. overcurrent condition when the discharging curr ent becomes equal to or higher than a specif ied value (the vm pin voltage is equal to or higher than the overcurrent detection voltage) during discharging under normal condition and the st ate continues for the overcurrent detection delay time or longer, the HT4301 turns off the discharging control fet to stop discharging. this condition is called overcurrent condition. (the overcurrent includes overcurrent 1, overcurrent 2, or load short-circuiting.) the vm and gnd pins are shorted internally by the rvms resistor under the overcurrent condition. when a load is connected, the vm pin voltage equals the vdd voltage due to the load. the overcurrent condition returns to the normal condition when the load is released and the impedance between the b+ and b- pins becomes higher than the automatic recoverable impedance. when the load is removed, the vm pin goes back to the gnd potential since the vm pin is shorted the gnd pin with the rvms resistor. detecting that the vm pin potential is lower than the overcurrent 1 detection voltage (v iov1 ), the ic returns to the normal condition. abnormal charge current detection if the vm pin voltage drops below the charger detection voltage (v cha ) during charging under the normal condition and it continues for the overcharge detection delay time (t cu ) or longer, the HT4301 turns the charging control fet off and stops charging. this action is called abnormal charge current detection. abnormal charge current detection works when the discharging control fe t is on and the vm pin voltage drops below the charger detection voltage (v cha ). when an abnormal charge current flows into a battery in the overdischarge condition, the HT4301 consequently turns the charging control fet off and stops charging after the battery voltage becomes the ov erdischarge detection voltage and the overcharge detection delay time (tcu) elapses. abnormal charge current detection is released when the voltage difference between vm pin and gnd pin becomes lower than the charger detection voltage (vcha) by separating the charger. since the 0 v ba ttery charging function has higher priority than the abnormal charge current detection func tion, abnormal charge current may not be detect ed by the product with the 0 v battery charging function while the battery voltage is low. load short-circuiting condition if voltage of vm pin is equal or below short circuiting protection voltage (v short ), the HT4301 will stop discharging and battery is disconnected from load. the maximum delay time to switch current off is tshort. this status is released when voltage of vm pin is higher than short protection voltage (v short ), such as when disconnecting the load. HT4301 6 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
delay circuits the detection delay time for overdischarge current 2 and load short-circuiting starts when overdischarge current 1 is detected. as soon as overdischarge current 2 or load short-circuiting is detected over detection delay time for overdischarge current 2 or load short- circuiting, the HT4301 st ops discharging. when battery voltage falls below overdischarge detection voltage due to overdischarge current, the HT4301 stop dischargi ng by overdischarge current detection. in this case the recovery of battery voltage is so slow that if battery voltage after overdischarge voltage detection delay time is still lower than overdischarge detection voltage, the HT4301 shifts to power-down. 0v battery charging function (1) (2) (3) this function enables the charging of a connected battery whose voltage is 0 v by self-discharge. when a charger having 0 v battery start charging charger voltage (v 0cha ) or higher is connected betw een b+ and b- pins, the charging control fet gate is fixed to vdd potential. when the voltage between the gate and the source of the chargi ng control fet becomes equal to or higher than the turn-on voltage by the charger voltage, the c harging control fet is turned on to start charging. at this time, the discharging control fet is off and the charging current flows through the internal parasitic diode in the discharging control fet. if the battery voltage becomes equal to or higher than the overdischarge release voltage (v du ), the normal condition returns. note (1) some battery providers do not recommend charging of completely discharged batteries. please refer to battery providers before the selection of 0 v battery charging function. (2) the 0v battery char ging function has higher priority than the abnormal charge current detection function. conseque ntly, a product with the 0 v battery chargi ng function charges a battery and abnormal charge current cannot be detected during the battery voltage is low (at most 1.8 v or lower). (3) when a battery is connected to the ic for the first time, the ic may not enter the normal condition in which discharging is possible. in this case, set the vm pin voltage equal to the gnd voltage (short the vm and gnd pins or connect a charger) to enter the normal condition. HT4301 7 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
timing chart 1. overcharge and overdischarge detection 2. figure5-1 overcharge and over discharge voltage detection 3. overdischarge current detection 4. figure5-2 overdischarge current detection remark: (1) normal condition (2) overcharge volt age condition (3) overdischarge voltage condition (4) overcurrent condition HT4301 8 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
3.charger detection figur e5-3 charger detection 5. abnormal charger detection 6. figure5-4 abnormal charger detection remark: (1) normal condition (2) overcharge voltage condition (3) overdischarge voltage condition (4) overcurrent condition HT4301 9 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
typical characteristics (test based on HT4301b version, v bat = 3.6v, t a = 25c unless otherwise specified) internal fet on-resistance vs. junction temperat ure power dissipation vs. charging current typical application as shown in figure 5, the bold line is the high density current path which must be kept as short as possible. for thermal management, ensure that t hese trace widths are adequ ate. c is a decoupling capacitor which should be placed as close as possible to HT4301. precautions ? pay attention to the operating c onditions for input/output voltage and lo ad current so that the power loss in HT4301 does not exceed the po wer dissipation of the package. ? do not apply an electrostatic discharge to this ht 4301 that exceeds the per formance ratings of the built-in electrostatic protection circuit. HT4301 10 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
package outline sot23-5 package outline and dimensions symb ol dimension in milimeters dimension in inches min max min max a 1.050 1.250 0.041 0.049 a1 0.000 0.100 0.000 0.004 a2 1.050 1.150 0.041 0.045 b 0.300 0.400 0.012 0.016 c 0.100 0.200 0.004 0.008 d 2.820 3.020 0.111 0.119 e 1.500 1.700 0.056 0.067 e1 2.650 2.950 0.104 0.116 e 0.950typ 0.037typ e1 1.800 2.000 0.071 0.079 l 0.700 ref 0.028 ref l1 0.300 0.600 0.012 0.024 e 0 8 0 8 HT4301 11 of 11 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification

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