FS325 Series Datasheet FS325 Series DatasheetV1.2 Lithium-Io

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FS325 Series Datasheet FS325 Series DatasheetV1.2 Lithium-Io

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FS325 Series Datasheet
FS325 Series DatasheetV1.2
Lithium-Ion/Lithium-Polymer Battery Protection
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Description
FS325 Series Datasheet
FS325 series lithium-ion lithium polymer rechargeable battery protection with high accurate voltage detection delay circuits. These suitable protection single cell lithium-ion lithium polymer battery packs from over charge, over discharge, over current.
1-Cell Protection
Package Model SOT-23-5 FS325 Overcharge detection voltage [VOCU] 4.280±0.025 4.300±0.025 4.300±0.040 Overcharge release voltage [VOCR] 4.130±0.05 4.080±0.05 4.080±0.05 Overdischarge detection voltage [VODL] 2.80±0.08 2.50±0.08 2.50±0.08 Overdischarge release voltage [VODR] 3.10±0.08 2.90±0.08 2.90±0.08 Overcurrent detection voltage [VOI1] (mV) 100±30 150±30 150±30
Overcharge overdischarge overcurrent detection voltages changed customer's request.
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Features
FS325 Series Datasheet
supply current Overcharge detection voltageVOCU Overcharge release voltageVOCR
Operation: 3.0uA typ. @VDD=3.9V Power-down mode: 0.1uA max. @VDD=2.0V 4.0V~4.4V, Accuracy ±25mV 3.8V~4.4V, Accuracy ±50mV 2.0V~3.0V, Accuracy ±80mV 2.0V~3.4V, Accuracy ±80mV 0.05V~0.4V, Accuracy ±30mV Fixed 1.35V
Overdischarge detection voltageVODL Overdischarge release voltageVODR Over current detection voltageVOI1 Short circuit detection voltageVOI2
Delay times generated internal circuit. (External capacitors unnecessary.) Charger detection voltage -1.35V >500K 9.0V SOT-23-5
Reset resistance Over current protection Wide supply voltage range Small package
Applications
Protection One-Cell Lithium-Ion Lithium-Polymer Battery Pack
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Block Diagram
FS325 Series Datasheet
Short circuit Detector
Overcharge Detector
Oscillator Control Circuit Over current Detector
Overdischarg Detector
Divider Control Logic Charger Detector
Control Logic
Configuration
Symbol Description
Input current sense, charger detect Positive power input Negative power input gate connection discharge control gate connection charge control
SOT-23-5 VIEW
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FS325 Series Datasheet
Typical Application Circuit
VBAT+
BATTERY 0.1uF
FS325 Series
VBAT-
Absolute Maximum Ratings
(VSS=0V, Ta=25 unless otherwise specified)
Item
Input voltage between output voltage output voltage input voltage Operating Temperature Range Storage Temperature Range
Symbol
VCSI
Rating
VSS-0.3 VSS+12 VDD-26 VDD+0.3 VSS-0.3 VDD+0.3 VDD-26 VDD+0.3 +125
Unit
Note: This contains circuit that protects from static discharge, take special care that excessive static electricity voltage which exceeds limit protection circuit applied Pulse (sec) noise exceeding above input voltage (VSS+12V) cause damage
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Electrical Characteristic
FS325 Series Datasheet
(VSS=0V, Ta=25 unless otherwise specified)
PARAMETER CURRENT CONSUMPTION
Supply Current Power-Down Current VDD=3.9V VDD=2.0V
CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
OPERATING VOLTAGE
Operating input voltage VDD-VSS VDS1
DETECTION VOLTAGE
Overcharge detection voltage Overcharge release voltage Overdischarge detection voltage Overdischarge release voltage Over current detection voltage Short circuit detection voltage Reset resistance Over current protection Charger detection voltage VDD=3.0V VDD=3.6V VOCU VOCR VODL VODR VOI1 VOI2 Rshort VOCU -0.025 VOCR -0.050 VODL -0.080 VODR -0.080 VOI1 -0.030 -1.8 VOCU VOCR VODL VODR VOI1 1.35 -1.35 VOCU +0.025 VOCR +0.050 VODL +0.080 VODR +0.080 VOI1 +0.030 -0.9
DELAY TIME
Overcharge detection delay time Overdischarge detection delay time Over current detection delay time Short circuit detection delay time
VDD=3.6V 4.4V VDD=3.6V 2.0V VDD=3.0V VDD=3.0V
TOI1 TOI2
OTHER
output voltage output voltage output voltage output voltage
VDD=3.9V, Ioh=-50uA VDD=4.5V, CSI=0V VDD=3.9V, Ioh=-50uA VDD=2.0V, Iol=50uA
Voh1 Vol1 Voh2 Vol2
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FS325 Series Datasheet
State Diagram Operation
Abnormal charge current condition,
(OC=0)
VDD<VOCU VCSI<VCH t>TOC
Over charge condition, (OC=0)
VCSI>VOI1 VDD<VOCU VDD>VOCU t>TOC VOI1>VCSI>VCH VDD<VOCR
VCSI>VCH
Over discharge condition, (OD=0)
VCSI<VOI2
VDD<VODL t>TOD VDD>VODR VCH<VCSI<VOI2 VCSI<VCH VCSI>VOI1 t>TOI1
Normal condition
(OD=OC=1)@ VODL<VDD<VOCU VCH<VCSI<VOI1
VCSI>VOI2
Power down condition
OD=0 IDD<= IPD(0.1uA)
VDD>VODL VCSI<VCH
VCSI>VOI2 t>TOI2
Load impedence >500K
Over current Short circuit condition,
(OD=0)
Charger detected overdischarge
OD=0 Overdischarge hystersis released. Trickle charging automatic charger.
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Description Operation
FS325 Series Datasheet
11.1 Normal Condition
FS325 monitors voltage battery connected between voltage difference between control charging discharging. When VODL<VDD<VOCU VCH<VCSI<VOI1, turns charging(M2) discharging(M1) control FETs charging discharging processes operated normally. This condition called normal condition. Note: When battery connected first time, enter normal condition (not dischargeable condition). this occurs, voltage equal voltage (short pins connect charger) enter normal condition.
11.2 Overcharge Condition
When battery voltage becomes higher than overcharge detection voltage(VOCU) during charging under normal condition detection continues overcharge detection delay time(TOC) longer, FS325 turns stop charging. This condition called overcharge condition.
11.3 Release Overcharge Condition
There ways return normal condition from overcharge condition.
When battery self discharging, VDD<VOCR VOI1>VCSI>VCH occurs, turned back normal condition. Remove charger connected load, that discharging current flows through parasitic diode this moment VCSI increases momentarily voltage parasitic diode from level. VCSI>VOI1 VDD<VOCU occurs, turned back normal condition. Note After entering overcharge condition, charger removed VOI1>VCSI>VCH, then will turned when voltage battery lower than VOCR (because self-discharge battery). system enter charge status again Note After entering overcharge condition, charger removed VCSI<VCH, then will kept even though voltage battery lower than VOCR (because self-discharge battery), system will enter charge status.
11.4 Overdischarge Condition
When battery voltage falls below overdischarge detection voltage(VODL) during discharging under normal condition detection continues overdischarge detection delay time(TOD) longer, FS325 turns stop discharging. This condition called
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FS325 Series Datasheet
overdischarge condition. meanwhile, pulled internal resistance, RCSID. VCSI>VOI2, protection enters into Power-down mode. (Its current consumption lower than 0.1uA).
11.5 Release Power-down mode
After entering Power-down mode, system connected charger, charging current flows through parasitic diode VCSI<VOI2 occurs, then will release Power-down mode. keeping charging, there ways enter normal condition.
VCSI<VCH (Charger detection), then when VDD>VODL, will turned system enters normal condition. VCH<VCSI<VOI2, then must VDD>VODR turned make system enter normal condition.
11.6 Charger Detection
Power-down mode, when connecting charger, VCSI<VCH, then will turned when VDD>VODL, system will enter normal condition described previous section, because charger detection function enabled. This action called charger detection.
11.7 Abnormal Charge Current Condition
When charger connected battery normal condition, VDD<VOCU VCSI<VCH occurs delay time longer than TOC, then will turned charging stop. This condition called abnormal charge current condition Abnormal charge current condition released when voltage becomes higher than charger detection voltage(VCH), charger removed.
11.8 Over Current Short Circuit Condition
When discharging current large during discharging under normal condition voltage detected from larger than VOIX (VOI1 VOI2) over certain delay time TOIX (TOI1 TOI2), means over current/short circuit condition occurred. turned off. pulled internal resistance, RCSIS. This condition called over current (short circuit) condition.
over current short circuit detected continues longer than overdischarge detection delay time without releasing load, condition changes power-down condition when battery voltage falls below overdischarge detection voltage. battery voltage falls below overdischarge detection voltage over current short circuit, discharging control turns when over current short circuit detected. battery voltage restores late battery voltage after overdischarge detection delay time equal lower than overdischarge detection voltage, condition changes power-down condition.
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FS325 Series Datasheet
11.9 Release Over Current Short Circuit Condition
While protection remains Over current/Short circuit condition load removed impedance between VBAT+ VBAT- larger than 500K VCSI<VOI1, turned back normal condition.
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Timing Diagram
FS325 Series Datasheet
12.1 Overcharge Condition
Charger Load
Self Discharge
Normal Condition
VOCU Battery Voltage VOCR VODR VODL
Self Discharge
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FS325 Series Datasheet
Load Discharge Normal Condition
12.2 Overcharge Condition
Charger Load
VOCU Battery Voltage VOCR VODR VODL
VOI1
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FS325 Series Datasheet
remove charger, VCSI >VCH Self Discharge
12.3 Overcharge Condition
Charger Load
VOCU Battery Voltage VOCR VODR VODL
Self Discharge Self Discharge
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FS325 Series Datasheet
remove charger, VCSI <VCH Self Discharge
12.4 Overcharge Condition
Charger Load
VOCU Battery Voltage VOCR VODR VODL
Self Discharge
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FS325 Series Datasheet
Charging charger Normal Condition
12.5 Overdischarge Condition
Charger Load
VOCU
Battery Voltage
VOCR VODR VODL
VOI2
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FS325 Series Datasheet
Abnormal Charge Current Condition Normal Condition
12.6 Overdischarge Condition
Charger Load
VOCU
Battery Voltage
VOCR VODR VODL
VOI2
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FS325 Series Datasheet
Normal Condition
12.7 Over Current Short Circuit Condition
Charger Load
VOCU Battery Voltage VOCR VODR VODL
VOI2 VOI1
TOI1
TOI2
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SOT-23-5
FS325 Series Datasheet
13.1 Dimensions
DETAIL
SYMBOL MIN. 1.05 0.05 1.00 0.25 0.08
Unit
TYP. MAX. 1.35 0.15
1.10 1.20 0.50 0.20 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. 0.25
0.10 0.10
GAUGE PLANE
SEATING PLANE
DETAIL
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FS325 Series Datasheet FS325 Series DatasheetV1.2 Lithium-Io

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