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RT9541 - RT9541
RT9541
Li-Ion Battery Protector
RT9541 Series protection overcharge/discharge rechargeable one-cell Lithium-ion (Li+) batteries CMOS process. RT9541 Series detect over-charge/discharge one-cell excess load current charge current, further include short circuit protector preventing large external short circuit current. Each these composed four voltage detectors, reference unit, hysteresis circuit, bidirectional short circuit protector. Package SOT26 available.
Features
supply current Supply current: TYP. 2.0µA Standby current (after detecting overdischarge): Less than 0.2µA High accuracy detector threshold Over-charge detector: ±25mV Over-discharge detector: ±2.5% Built-in protection circuit Excess current trip/Short circuit protector both charging discharging direction Output delay over-charge adjustable with external capacitor: 75mS 0.01µF Ultra small package: SOT26
Ordering Information
RT9541 Package type SOT-26 Type SOT-26 Type Operating temperature range Commercial standard Table
Applications
Over-charge Over-discharge Protection One-cell Pack High Precision Protectors Cellular Phones Instruments Using One-cell Battery
Configurations
Part Number RT9541 Configurations
VIEW
Typical Application Circuit
0.1µF 0.01µF
(Plastic SOT-26)
COUT DOUT
RT9541
VCOUT
RT9541 (Plastic SOT-26)
VIEW DOUT VCOUT
DOUT
0.1µF
DS9541-05 August 2001
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RT9541
Absolute Maximum Ratings
Allowable Battery Voltage Input Voltage Input Voltage (CT) Output Voltage (COUT) Output Voltage (DOUT) Power Dissipation, 25°C SOT-26 Package Thermal Resistance SOT-26, Operating Temperature Range Storage Temperature Range
-0.3V VDD-14V +0.3V VSS-0.3V +0.3V VDD-14V +0.3V VSS-0.3V +0.3V 0.25W 250°C/W -20°C +85°C -65°C +150°C
Electrical Characteristics
Parameter Operating Input Voltage Charger Voltage Minimum Operating Voltage Charging Accuracy Over-charge Threshold Voltage Over-charge Threshold Hysteresis Output Delay Time Over-charge TOCHG Accuracy Over-discharge Threshold Voltage Output Delay Time Overdischarge Excess Current Threshold Voltage During Discharge Output Delay Discharge Excess Current Excess Current Threshold Voltage During Charge Output Delay Charge Excess Current Short Detection Voltage During Discharge Output Delay Discharge Short Circuit Reset Resistance Excess Current Protection Supply Current Standby Current
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Symbol VCHG
Test Conditions Voltage defined VDD-VSS Voltage defined VDD-VVoltage defined VDD-VVDD-VSS
-0.15 0.17 -0.17
0.19 -0.15
Units
VOCHG
Detect rising edge supply voltage 0.01µF, 3.6V 4.3V Detect falling edge supply voltage 3.6V 2.4V Detect rising edge "V-" voltage 3.0V Detect falling edge "V-" voltage
-2.5 0.15 -0.19
VODISCHG TODISCHG
3.0V TSHORT RSHORT ISTANDBY 3.0V 3.6V, 1.0V 3.9V, 2.0V
VDD-1.1 VDD-0.8 VDD-0.5
DS9541-05 August 2001
Preliminary Table
Part Number RT9541ACE RT9541BCE RT9541CCE RT9541DCE RT9541ECE RT9541FCE RT9541GCE RT9541HCE RT9541ICE RT9541JCE Over Over Excess Charge Discharge Current 4.25V 4.25V 4.25V 4.25V 4.25V 4.25V 4.30V 4.30V 4.30V 4.30V 2.3V 2.4V 2.5V 2.6V 2.7V 2.8V 2.3V 2.4V 2.5V 2.6V 170mV 170mV 170mV 170mV 170mV 170mV 170mV 170mV 170mV 170mV Part Number RT9541KCE RT9541LCE RT9541MCE RT9541NCE RT9541OCE RT9541PCE RT9541QCE RT9541RCE RT9541SCE RT9541TCE
RT9541
Over Over Excess Charge Discharge Current 4.30V 4.30V 4.35V 4.35V 4.35V 4.35V 4.35V 4.35V 4.35V 4.25V 2.7V 2.8V 2.3V 2.4V 2.5V 2.6V 2.7V 2.8V 2.9V 2.9V 170mV 170mV 170mV 170mV 170mV 170mV 170mV 170mV 170mV 170mV
Function Block Diagram
Level Shift Delay
Description
Number RT9541- RT9541- Name COUT DOUT VPin Function Output Over-charge Detection, CMOS Output External Capacitor Setting Output Delay Ground Output Over-discharge Detection, CMOS Output Power Supply, through Resistor (R1) Charger Negative Input, through Resistor (R2)
DS9541-05 August 2001
Short Circuit Detector
DOUT
COUT
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RT9541
Applications Information
Operation Description
Refering "Function Block Diagram", when charging voltage crosses detector threshold from value value higher than VDET1, output COUT pin, output over-charge detector/VD1, swiches level,.charger's negative level. After detecting over-charge reset output COUT becomes when voltage coming down level lower than "VDET1 VHYS1", when charger disconnected from battery pack. output DOUT pin, output over-discharge detector/VD2, switches after internally fixed delay time passed, when discharging voltage crosses detector threshold from high value value lower than VDET2. excess load current sensed after internally fixed delay time passsed through built excess current detector, VD3, with DOUT being enabled level. Once after detecting excess current, released DOUT level switches detaching battery pack from load system. Futher, short circuit protector makes DOUT level immediately with external short circuit current removing external short circuit leads DOUT level "H".
short circuit protection function charging direction also provided. When COUT high "V-" voltage lower than pin, RT9541 will turn COUT with fixed delay. COUT will high after short circuit condition removed. After detecting over-discharge, supply current will kept extremely halting some internal circuits operation. output delay over-charge detectors connecting external capacitor. Output type COUT DOUT CMOS. Component Selection Guide: Referring "Typical Application Circuit", will stabilize supply voltage RT9541. recommended value less than larger value leads higher detection voltage, makes some errors, because shoot through current flowed RT9541. will stabilize voltage. resetting from over-discharge with connecting charger possibly disabled larger value Recommended value less than recommended value less than 1µF. operate current limiter against
excess charging current also monitored, charging path will turn COUT) after excess charging current detected lasting internally fixed delay time. charging path will re-started turn high COUT) after another internally fixed delay. excess charging current still there, same process will repeated cause charging path toggling with 12.5% duty. Such protection function reduces average charging current 12.5% original value when excess charging current detected.
setting cell reverse direction applying excess charging voltage RT9541. While smaller cause over power dissipation rating RT9541 total "R1+R2" should more than
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DS9541-05 August 2001
Preliminary Timing Diagram
RT9541- CE/CER
RT9541
DS9541-05 August 2001
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RT9541
Package Information
Symbol
Dimensions Millimeters 0.889 -1.397 0.356 2.591 2.692 0.838 0.102 0.356 1.295 0.152 1.803 0.559 2.997 3.099 1.041 0.254 0.610
Dimensions Inches 0.035 -0.055 0.014 0.102 0.106 0.033 0.004 0.014 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
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DS9541-05 August 2001
RT9541
DS9541-05 August 2001
www.richtek-ic.com.tw
RT9541
RICHTEK TECHNOLOGY CORP.
Headquarter
Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw
www.richtek-ic.com.tw
DS9541-05 August 2001
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