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FS325
Lithium-ion/Polymer Battery Protection IC
General Description
FS325 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
FS325 x Serial code from A to C * *: Refer to the product name list on next page.
Features
Low supply current Normal Operation : 3.0A typ. @VDD=3.9V Power-down mode : 0.1A max. @VDD=2.0V Overcharge detection voltage VOCU 4.2V~4.4V, Accuracy of 25mV Overcharge release voltage VOCR 3.8V~4.2V, Accuracy of 50mV Overdischarge detection voltage VODL 2.0V~2.8V, Accuracy of 80mV Overdischarge release voltage VODR 2.8V~3.2V, Accuracy of 80mV Over current detection voltage VOI1 0.05V~0.2V, Accuracy of 30mV Short circuit detection voltage VOI2 Fixed at 1.35V Delay times are generated by an internal circuit. (External capacitors are unnecessary.) Charger detection voltage -1.35V Reset resistance for Over current protection >500k Wide supply voltage range Small package 1.8 ~ 9.0V SOT-23-5
Applications
Protection IC for One-Cell Lithium-Ion / Lithium-Polymer Battery Pack
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
1/16
TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC
Product Name List
Package Model SOT-23-5 A FS325 B C Overcharge detection voltage [VOCU] (V) 4.2800.025 4.3000.025 4.3000.040 Overcharge release voltage [VOCR] (V) 4.1300.05 4.0800.05 4.0800.05 Overdischarge Overdischarge detection release voltage voltage [VODL] (V) [VODR] (V) 2.800.08 2.500.08 2.500.08 3.100.08 2.900.08 2.900.08 Overcurrent detection voltage [VOI1] (mV) 10030 15030 15030
Overcharge and overdischarge and overcurrent detection voltages can be changed at the customer's request.
Pin Configuration
Pin No. Symbol 1 2 3 4 5 CSI VDD VSS OD OC Description Input pin for current sense, charger detect Positive power input pin Negative power input pin FET gate connection pin for discharge control FET gate connection pin for charge control
1 2 3 5 4
SOT-23-5 TOP VIEW
Fortune Semiconductor Co.
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TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC
Functional Block Diagram
VDD
Short circuit Detector Oscillator Control Circuit Over current Detector Divider Control Logic Charger Detector
VSS
VSS
Overcharge Detector
VSS CSI
Overdischarg e Detector
VSS
VSS
Control Logic
OD
Typical Application Circuit
VBAT+
R1 100 ~ 470 VDD
C1 0.1 F
FS325 Series
CSI OD OC
VSS
OC
M1
M2
R2 1k
VBAT-
Fortune Semiconductor Co.
http://www.fsc.com.tw
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TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC
Absolute Maximum Ratings
(VSS=0V, Ta=25C unless otherwise specified) Item Input voltage between VDD and VSS * OC output pin voltage OD output pin voltage CSI input pin voltage Operating Temperature Range Storage Temperature Range Symbol VDD VOC VOD VCSI TOP TST Rating VSS-0.3 to VSS+12 VDD-26 to VDD+0.3 VSS-0.3 to VDD+0.3 VDD-26 to VDD+0.3 -40 to +85 -40 to +125 Unit V V V V C C
Note: FS325 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 (sec) noise exceeding the above input voltage (VSS+12V) may cause damage to the IC.
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
4/16
TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC
Electrical Characteristics
(VSS=0V, Ta=25C unless otherwise specified)
PARAMETER CURRENT CONSUMPTION Supply Current Power-Down Current OPERATING VOLTAGE Operating input voltage DETECTION VOLTAGE Overcharge detection voltage Overcharge release voltage Overdischarge detection voltage Overdischarge release voltage Over current detection voltage Short circuit detection voltage Reset resistance for Over current protection Charger detection voltage DELAY TIME Overcharge detection delay time Overdischarge detection delay time Over current detection delay time Short circuit detection delay time OTHER OC pin output "H" voltage OC pin output "L" voltage OD pin output "H" voltage OD pin output "L" voltage
VDD=3.9V, Ioh=-50A VDD=4.5V, CSI=0V VDD=3.9V, Ioh=-50A VDD=2.0V, Iol=50A VDD=3.6V to 4.4V VDD=3.6V to 2.0V VDD=3.0V VDD=3.0V
CONDITIONS
SYMBOL
Min
Typ
Max
UNIT
VDD=3.9V VDD=2.0V
IDD IPD
3.0
6.0 0.1
A A
VDD-VSS
VDS1
1.8 VOCU -0.025 VOCR -0.050 VODL -0.080 VODR -0.080 VOI1 -0.030 1.0 400 -1.8
9.0 VOCU +0.025 VOCR +0.050 VODL +0.080 VODR +0.080 VOI1 +0.030 1.7 600 -0.9
V
VOCU VOCR VODL VODR VOI1 VDD=3.0V VDD=3.6V VOI2 Rshort VCH
VOCU VOCR VODL VODR VOI1 1.35 500 -1.35
V V V V V V k V
TOC TOD TOI1 TOI2 5
1.3 180 10 10
1.9 260 15 50
s ms ms s
Voh1 Vol1 Voh2 Vol2
3.4
3.7 0.1 0.5
V V V 0.5 V
3.4
3.7 0.1
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
5/16
TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC
State Diagram of Operation
Abnormal charge current condition,
(OC=0)
(S) VDDTOC
(F) Over charge condition, (OC=0)
(H) VCSI>VOI1 & VDDVOCU & t>TOC (G) VOI1>VCSI>VCH & VDD(T) VCSI>VCH
(J) Over discharge condition, (OD=0)
(M) VCSI(I) VDDTOD (N) VDD>VODR & VCHVODL & VCSIVOI1 & t>TOI1
(A) Normal condition
(OD=OC=1)@ VODL(K) VCSI>VOI2
(L) Power down condition
OD=0 IDD<= IPD(0.1A)
(C) VCSI>VOI2 & t>TOI2
(D) Load impedence >500K
Over current or Short circuit condition,
(OD=0)
(P) Charger is detected @ overdischarge
OD=0 Overdischarge hystersis is released. Trickle charging by automatic charger.
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
6/16
TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC
Description of Operation
1. Normal Condition
The FS325 monitors the voltage of the battery connected between VDD and VSS. The charge and discharge scheme will be sensed by the voltage difference between CSI and VSS. When VODLFS325 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 FS325 for the first time, it may not enter the normal condition (dischargeable may not be enabled). In this case, short the CSI and VSS 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 (VOCU) during normal charging condition through a delay time longer than TOC (the overcharge detection delay time), FS325 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) 2)
When the battery is self discharging, and if VDDVCSI>VCH occurs, M2 will be turned on and back to normal condition. Remove the charger and connect FS325 to a load, the discharging current will flow through the parasitic diode of M2. At this moment, VCSI increases a voltage (VF) of the parasitic diode from the VSS level momentarily. While VCSI>VOI1 and VDDNote 1: After entering into the overcharge condition, if the charger remains connected and VOI1>VCSI>VCH, then M2 will be turned on when the voltage of the battery is lower than VOCR (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 VCSI4.
Overdischarge Condition
When the battery voltage falls below the overdischarge detection voltage (VODL) during discharging condition through a delay time longer than TOD (the overdischarge detection delay time), FS325 will turn M1 off to stop discharging. This is called the overdischarge condition. In the meanwhile, CSI is pulled up to VDD by way of internal resistance. If VCSI>VOI2, FS325 will enter into power-down mode. While in this mode, the current consumption is lower than 0.1A.
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
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TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC
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 VCSIFS325 will release power-down mode. While keeping charging status, there are two ways back to normal condition:
1) 2)
If VCSIVODL, M1 will be turned on and the system will back to normal condition. If VCHVODR 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 VCSIVODL. 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 VDD8.
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 VOI1 (or VOI2) for a delay time longer than 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 VSS 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 power-down mode when the battery voltage falls below the overdischarge detection voltage. If the battery voltage falls below the overdischarge detection voltage (VODL) due to the over current / short circuit, the discharging control FET (M1) will be turned off when this condition occurred. 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 VBAT+ and VBAT- is larger than 500k as well as VCSIFortune Semiconductor Co.
http://www.fsc.com.tw
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TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC
Timing Diagram
1. Overcharge Condition Self Discharge Normal Condition
Charger Load
VOCU Battery Voltage OC Pin VOCR VODR VODL
VDD
CSI
VDD OD Pin VSS VDD CSI Pin VSS VCH
TOC Self Discharge
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
9/16
TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC 2. Overcharge Condition Load Discharge Normal Condition
Charger Load
VOCU Battery Voltage OC Pin VOCR VODR VODL
VDD
CSI
VDD OD Pin VSS VDD CSI Pin VOI1 VSS VCH
TOC TOC
Fortune Semiconductor Co.
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TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC 3. Overcharge Condition Discharge Charger remains connected and VCSI >VCH Self
Charger Load
VOCU Battery Voltage OC Pin VOCR VODR VODL
VDD
CSI
VDD OD Pin VSS VDD CSI Pin VSS VCH
TOC Self Discharge TOC Self Discharge
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
11/16
TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC 4. Overcharge Condition Discharge Charger remains connected and VCSI Charger Load
VOCU Battery Voltage OC Pin VOCR VODR VODL
VDD
CSI
VDD OD Pin VSS VDD CSI Pin VSS VCH
TOC Self Discharge TOC
Fortune Semiconductor Co.
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TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
12/16
TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC 5. Overdischarge Condition Charging by a Charger Normal Condition
Charger Load
VOCU Battery Voltage OC Pin VOCR VODR VODL
VDD
CSI
VDD OD Pin VSS CSI Pin VDD VOI2 VSS VCH
TOD TOD
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
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TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC 6. Overdischarge Condition Condition Abnormal Charge Current Condition Normal
Charger Load
VOCU Battery Voltage OC Pin VOCR VODR VODL
VDD
CSI
VDD OD Pin VSS CSI Pin VDD VOI2 VSS VCH
TOD TOC
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TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC 7. Over Current / Short Circuit Condition Normal Condition
Charger Load
VOCU Battery Voltage OC Pin VOCR VODR VODL
VDD
CSI
VDD OD Pin VSS CSI Pin VDD VOI2 VOI1 VSS
TOI1
TOI2
Fortune Semiconductor Co.
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TD-0403005 Rev. 1.3
FS325
Lithium-ion/Polymer Battery Protection IC
Package Outline
D DETAIL A b
SYMBOL A A1 A2 b c D E E1 e e1 MIN. 1.05 0.05 1.00 0.25 0.08
Unit : mm
TYP. 1.10 2.90 BSC. 2.80 BSC. 1.60 BSC. 0.95 BSC. 1.90 BSC. 0.35 0.45 0.55 0.60 REF. 0.25 BSC. 5 5 0.25 10 7 MAX. 1.35 0.15 1.20 0.50 0.20
E1
E
e e1 1
c
L L1 L2 R R1
0.10 0.10 0 3
R1 R A2 A L2
GAUGE PLANE
1
A1
L 1 L1
SEATING PLANE
DETAIL A
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TD-0403005 Rev. 1.3

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