FS326. One Cell Lithium-ion/Polymer Battery Protection IC. FS326 x Serial code from A to G *

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Hillary Kennedy
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General Description is a series of lithium-ion and lithium-polymer rechargeable battery protection ICs with high accurate voltage detection and delay circuits.

1 General Description is a series of lithium-ion and lithium-polymer rechargeable battery protection ICs with high accurate voltage detection and delay circuits. These ICs are suitable for protection of single cell lithium-ion or lithium polymer battery packs from over charge, over discharge and over current. Ordering Information x Serial code from A to G * *: Refer to the product name list on next page. Features Low supply current Normal Operation : 3.0μA Power-down mode : 0.1μA Overcharge detection voltage 4.2~4.4, Accuracy of ±25m Overcharge release voltage 3.8~4.2, Accuracy of ±50m Overdischarge detection voltage 2.2~2.9, Accuracy of ±50*m Overdischarge release voltage 2.4~3.2, Accuracy of ±50*m Over current detection voltage OI1 0.05~0.2, Accuracy of ±30m Short circuit detection voltage OI2 Fixed at 1.35 Delay times are generated by an internal circuit. (External capacitors are unnecessary.) Charger detection voltage -0.7 Reset resistance for Over current protection >500kΩ Wide supply voltage range 1.8 ~ 9.0 Small package SOT-23-6 Applications Protection IC for One-Cell Lithium-Ion / Lithium-Polymer Battery Pack *: ±50m for F version, others are ±80m. Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

2 Product Name List Model Package SOT-23-6 Overcharge detection voltage [] () Overcharge release voltage [] () Overdischarge detection voltage [] () Overdischarge release voltage [] () Overcurrent detection voltage [OI1] (m) A 4.325± ± ± ± ±30 B 4.350± ± ± ± ±30 C 4.325± ± ± ± ±30 D 4.300± ± ± ± ±30 E 4.300± ± ± ± ±30 F 4.275± ± ± ± ±30 G 4.280± ± ± ± ±30 Overcharge, overdischarge and overcurrent detection voltages can be changed at the customer s request. Pin Configuration Pin No. Symbol Description 1 OD FET gate connection pin for discharge control 2 CSI Input pin for current sense, charger detect 3 OC FET gate connection pin for charge control 4 DS Test pin for reduce delay time SOT-23-6 TOP IEW Positive power input pin 6 Negative power input pin Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

3 Functional Block Diagram CSI Charger Detector OD OC DS Short circuit Detector Overcharge Detector Oscillator Control Circuit Over current Detector Overdischarge Detector Divider Control Logic Control Logic Typical Application Circuit BAT+ R1 100 ~ 470Ω C1 0.1µ F Series DS CSI OD OC M1 M2 R2 1kΩ BAT- Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

4 Absolute Maximum Ratings (=0, Ta=25 C unless otherwise specified) Item Symbol Rating Unit Input voltage between and * -0.3 to +12 OC output pin voltage OC -26 to +0.3 OD output pin voltage OD -0.3 to +0.3 CSI input pin voltage CSI -26 to +0.3 DS input pin voltage DS -0.3 to +0.3 Operating Temperature Range TOP -40 to +85 C Storage Temperature Range TST -40 to +125 C Note: contains a circuit that will protect it from static discharge; but please take special care that no excessive static electricity or voltage which exceeds the limit of the protection circuit will be applied to it. * Pulse (μsec) noise exceeding the above input voltage (+12) may cause damage to the IC. Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

5 Electrical Characteristics (except G) (=0, DS=Floating, Ta=25 C unless otherwise specified) PARAMETER CONDITIONS SYMBOL Min Typ Max UNIT CURRENT CONSUMPTION Supply Current =3.9 IDD μa Power-Down Current =2.0 IPD 0.1 μa OPERATING OLTAGE Operating input voltage - DS DETECTION OLTAGE Overcharge detection voltage Overcharge release voltage Overdischarge detection voltage Overdischarge release voltage Over current detection voltage OI * * OI OI * * OI Short circuit detection voltage =3.0 OI Reset resistance for Over current protection =3.6 Rshort kω Charger detection voltage CH DELAY TIME Overcharge detection delay time =3.6 to 4.4 TOC s Overdischarge detection delay time =3.6 to 2.0 TOD ms Over current detection delay time =3.0 TOI ms Short circuit detection delay time =3.0 TOI μs OTHER OC pin output H voltage =3.9, Ioh=-50μA oh OC pin output L voltage =4.5, CSI=0 ol OD pin output H voltage =3.9, Ioh=-50μA oh OD pin output L voltage =2.0, Iol=50μA ol *: For F, the accuracy is ±0.05. Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

6 Electrical Characteristics (G only) (=0, DS=Floating, Ta=25 C unless otherwise specified) PARAMETER CONDITIONS SYMBOL Min Typ Max UNIT CURRENT CONSUMPTION Supply Current =3.9 IDD μa Power-Down Current =2.0 IPD 0.1 μa OPERATING OLTAGE Operating input voltage - DS DETECTION OLTAGE Overcharge detection voltage Overcharge release voltage Overdischarge detection voltage Overdischarge release voltage Over current detection voltage OI OI OI OI Short circuit detection voltage =3.0 OI Reset resistance for Over current protection =3.6 Rshort kω Charger detection voltage CH DELAY TIME Overcharge detection delay time =3.6 to 4.4 TOC ms Overdischarge detection delay time =3.6 to 2.0 TOD ms Over current detection delay time =3.0 TOI ms Short circuit detection delay time =3.0 TOI μs OTHER OC pin output H voltage =3.9, Ioh=-50μA oh OC pin output L voltage =4.5, CSI=0 ol OD pin output H voltage =3.9, Ioh=-50μA oh OD pin output L voltage =2.0, Iol=50μA ol Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

7 State Diagram of Operation Abnormal charge current condition, (OC=0) (T) CSI>CH (S) < CSI<CH t>toc (H) CSI>OI1 < (F) Over charge condition, (OC=0) (E) > t>toc (G) OI1>CSI>CH < (M) CSI<OI2 (J) Over discharge condition, (OD=0) (K) CSI>OI2 (L) Power down condition OD=0 I DD <= IPD(0.1μA) (R) CSI<CH (I) < t>tod (N) > CH<CSI<OI2 (Q) > CSI<CH (P) Charger is overdischarge (B) CSI>OI1 t>toi1 (A) Normal condition (OD=OC=1)@ << CH<CSI<OI1 Over current or Short circuit condition, (OD=0) (C) CSI>OI2 t>toi2 (D) Load impedence >500KΩ OD=0 Overdischarge hystersis is released. Trickle charging by automatic charger. Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

8 Description of Operation 1. Normal Condition The monitors the voltage of the battery connected between and. The charge and discharge scheme will be sensed by the voltage difference between CSI and. When << and CH<CSI<OI1, will turn on the charging (M2) and discharging (M1) control MOSFETs. The charging and discharging processes can be operated normally. This is called the normal condition. Note: When a battery is connected to for the first time, it may not enter the normal condition (dischargeable may not be enabled). In this case, short the CSI and pins or connect a charger to restore to the normal condition. 2. Overcharge Condition When the battery voltage becomes higher than the overcharge detection voltage () during normal charging condition through a delay time longer than TOC (the overcharge detection delay time), will turn M2 off to stop charging. This condition is called the overcharge condition. 3. Release of Overcharge Condition There are two ways to return to normal condition from overcharge condition. 1) When the battery is self discharging, and if < and OI1>CSI>CH occurs, M2 will be turned on and back to normal condition. 2) Remove the charger and connect to a load, the discharging current will flow through the parasitic diode of M2. At this moment, CSI increases a voltage (F) of the parasitic diode from the level momentarily. While CSI>OI1 and < occurs, M2 will be turned on and back to normal condition. Note 1: After entering the overcharge condition, if the charger remains connected and OI1>CSI>CH, then M2 will be turned on when the voltage of the battery is lower than (because the self-discharge of the battery). The system can enter the charging status again as 1). Note 2: After entering the overcharge condition, if the charger remains connected and CSI<CH, then M2 will be kept off even though the voltage of the battery is lower than (because the self-discharge of the battery), and the system will not be allowed to enter the charging status. 4. Overdischarge Condition When the battery voltage falls below the overdischarge detection voltage () during discharging condition and through a delay time longer than TOD (the overdischarge detection delay time), will turn M1 off to stop discharging. This is called the overdischarge condition. In the meanwhile, CSI will be pulled up to through an internal resistance. If CSI>OI2, will enter into power-down mode. While in this mode, the current consumption is lower than 0.1μA. Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

9 5. Release of Power-down mode After entering power-down mode, when the system is connected to a charger, the charging current will flow through the parasitic diode of M1. If CSI<OI2 occurs, then will release power-down mode. While keeping charging status, there are two ways back to normal condition: 1) If CSI<CH (Charger detection), then when >, M1 will be turned on and the system will back to normal condition. 2) If CH<CSI<OI2, the condition > must be satisfied for M1 to be turned on, and then the system will back to the normal condition. 6. Charger Detection While connecting to a charger after entering into power-down mode, then if CSI<CH, M1 will be turned on when >. The system will back to normal condition as described in 1) of previous section since the charger has been detected. This action is called charger detection. 7. Abnormal Charge Current Condition When a charger is connected to the battery system in normal condition, then if < and CSI<CH occurs through a delay time longer than TOC (delay time of overcharge detection), M2 will be turned off to stop this charging status. It is called the abnormal charge current condition. Abnormal charge current condition is released when the voltage of CSI pin becomes higher than charger detection voltage (CH), or the charger is removed. 8. Over Current / Short Circuit Condition When the current is too large during discharging under normal condition as a result of the voltage detected by CSI is greater than OI1 (or OI2) through a delay time TOI1 (or TOI2), it satisfies the over current (or short circuit) condition. Then M1 will be turned off and CSI will be pulled down to through an internal resistance. It is called the over current (or short circuit) condition. If the over current / short circuit is detected and it keeps longer than the overdischarge detection delay time with the same circumstance, the condition will be changed to the power-down mode when the battery voltage falls below the overdischarge detection voltage. If the battery voltage falls below the overdischarge detection voltage () due to the over current / short circuit, the discharging control FET (M1) will be turned off when this condition occurs. After overdischarge detection delay time (TOD) expired, if the battery voltage is still equal to or lower than the overdischarge detection voltage, the condition will then be changed to power-down mode. 9. Release of Over Current / Short Circuit Condition While the protection IC remains in Over current/short circuit condition, then if the load is removed or the impedance between BAT+ and BAT- is larger than 500kΩ as well as CSI<OI1, M1 will be turned on and then back to normal condition. 10. DS Pin By forcing DS to, the delay time of the overcharge and overdischarge can be reduced to within 50ms; therefore, testing time of protector circuit board can be reduced.1.6mω pull down resistor is Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

10 connected between DS pin and internally. DS pin should be left open or connected to in the actual application. Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

11 Timing Diagram 1. Overcharge Condition Self Discharge Normal Condition Charger Load Battery oltage OC Pin CSI OD Pin CSI Pin CH TOC Self Discharge Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

12 2. Overcharge Condition Load Discharge Normal Condition Charger Load Battery oltage OC Pin CSI OD Pin CSI Pin OI1 CH TOC TOC Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

13 3. Overcharge Condition Charger remains connected and CSI >CH Self Discharge Charger Load Battery oltage OC Pin CSI OD Pin CSI Pin CH TOC TOC Self Discharge Self Discharge Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

14 4. Overcharge Condition Charger remains connected and CSI <CH Self Discharge Charger Load Battery oltage OC Pin CSI OD Pin CSI Pin CH TOC TOC Self Discharge Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

15 5. Overdischarge Condition Charging by a Charger Normal Condition Charger Load Battery oltage OC Pin CSI OD Pin CSI Pin OI2 CH TOD TOD Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

16 6. Overdischarge Condition Abnormal Charge Current Condition Normal Condition Charger Load Battery oltage OC Pin CSI OD Pin CSI Pin OI2 CH TOD TOC Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

17 7. Over Current / Short Circuit Condition Normal Condition Charger Load Battery oltage OC Pin CSI OD Pin CSI Pin OI2 OI1 TOI1 TOI2 Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

18 Package Outline Dimension (Package A) E b D e e1 θ1 E1 c R1 DETAIL A SYMBOL MIN. TYP. MAX. A A1 A2 b c D E E1 e e1 L L1 L2 R R1 θ 0 4 θ BSC BSC BSC BSC BSC REF BSC. Unit : mm R A A2 L2 GAUGE PLANE A1 θ1 L L1 θ SEATING PLANE DETAIL A Dimension (Package B) D E e1 b e θ1 b2 E1 c DETAIL A SYMBOL MIN. TYP. MAX. A A1 A2 b L1 e b c D E E L REF BSC. Unit : mm e BSC. θ θ θ A A2 GAUGE PLANE A1 θ2 L L1 θ SEATING PLANE DETAIL A Fortune Semiconductor Corp. TEL : /18 -DS-15_EN Rev. 1.5

UNISONIC TECHNOLOGIES CO., LTD UB2421 Preliminary CMOS IC

UNISONIC TECHNOLOGIES CO., LTD ONE CELL LITHIUM-ION / POLYMER BATTERY PROTECTION IC DESCRIPTION UTC UB2421 is a lithium-ion / lithium-polymer rechargeable battery protection IC incorporating high accuracy