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Preliminary
RT9541
Li-Ion Battery Protector
General Description
The RT9541 Series are protection ICs for overcharge/discharge of rechargeable one-cell Lithium-ion (Li+) batteries by CMOS process. The RT9541 Series can detect over-charge/discharge of Li+ one-cell and excess load current and charge current, further include a short circuit protector for preventing large external short circuit current. Each of these ICs is composed of four voltage detectors, a reference unit, a hysteresis circuit, and a bidirectional short circuit protector. Package of SOT26 is available.
Features
Low supply current - Supply current: TYP. 2.0A - Standby current (after detecting overdischarge): Less than 0.2A High accuracy detector threshold - Over-charge detector: 25mV - Over-discharge detector: 2.5% Built-in protection circuit - Excess current trip/Short circuit protector in both charging and discharging direction Output delay of over-charge adjustable with an external capacitor: 75mS at 0.01F Ultra small package: SOT26
Ordering Information
RT9541 Package type E : SOT-26 Type I ER : SOT-26 Type II Operating temperature range C: Commercial standard See Table 1
Applications
Over-charge / Over-discharge Protection for Li+ One-cell Pack High Precision Protectors for Cellular Phones or Instruments Using Li+ One-cell Battery
Pin Configurations
Part Number RT9541 CE Pin Configurations
TOP VIEW
6 5 4
Typical Application Circuit
R1 100 C1 0.1F CT C3 0.01F
+
(Plastic SOT-26)
1
2
3
VDD
1. 2. 3. 4. 5. 6.
COUT CT VSS DOUT VDD V-
RT9541
VCOUT
RT9541 CER (Plastic SOT-26)
6 5 4
TOP VIEW 1. 2. 3. 4. 5. 6. DOUT VCOUT CT VDD VSS
VSS
DOUT
1
2
3
C2 0.1F
R2 1K
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RT9541
Absolute Maximum Ratings
Allowable Battery Voltage Input Voltage (V) Input Voltage (CT) Output Voltage (COUT) Output Voltage (DOUT) Power Dissipation, PD @ TA = 25C SOT-26 Package Thermal Resistance SOT-26, JA Operating Temperature Range Storage Temperature Range
Preliminary
-0.3V ~ 7V VDD-14V to VDD +0.3V VSS-0.3V to VDD +0.3V VDD-14V to VDD +0.3V VSS-0.3V to VDD +0.3V 0.25W 250C/W -20C ~ +85C -65C ~ +150C
Electrical Characteristics
Parameter Operating Input Voltage Charger Voltage Minimum Operating Voltage for 0V Charging Accuracy of Over-charge Threshold Voltage Over-charge Threshold Hysteresis Output Delay Time of Over-charge TOCHG Accuracy of Over-discharge Threshold Voltage Output Delay Time of Overdischarge Excess Current Threshold Voltage During Discharge Output Delay of Discharge Excess Current Excess Current Threshold Voltage During Charge Output Delay of Charge Excess Current Short Detection Voltage During Discharge Output Delay of Discharge Short Circuit Reset Resistance for Excess Current Protection Supply Current Standby Current
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Symbol VDD VCHG
Test Conditions Voltage defined as VDD-VSS Voltage defined as VDD-VVoltage defined as VDD-VVDD-VSS = 0V
Min 1 ---25 0.1
Typ ----0.15 60 -15 0.17 20 -0.17 20
Max 6 14 1 25 0.2 80 2.5 20 0.19 25 -0.15 25
Units V V V mV V mS % mS V mS V mS V S k A A
VOCHG
Detect rising edge of supply voltage C3 = 0.01F, VDD = 3.6V ~ 4.3V Detect falling edge of supply voltage VDD = 3.6V ~ 2.4V Detect rising edge of "V-" pin voltage VDD = 3.0V Detect falling edge of "V-" pin voltage
30 -2.5 10 0.15 15 -0.19 15
VODISCHG TODISCHG
VDD = 3.0V TSHORT RSHORT IDD ISTANDBY VDD = 3.0V VDD = 3.6V, V- = 1.0V VDD = 3.9V, V- = 0V VDD = 2.0V
VDD-1.1 VDD-0.8 VDD-0.5 -25 --5 50 2.0 0.1 50 75 5.0 0.5
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Preliminary Table 1
Part Number RT9541ACE (R) RT9541BCE (R) RT9541CCE (R) RT9541DCE (R) RT9541ECE (R) RT9541FCE (R) RT9541GCE (R) RT9541HCE (R) RT9541ICE (R) RT9541JCE (R) 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 (R) RT9541LCE (R) RT9541MCE (R) RT9541NCE (R) RT9541OCE (R) RT9541PCE (R) RT9541QCE (R) RT9541RCE (R) RT9541SCE (R) RT9541TCE (R)
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
VDD CT
Level Shift + _ VD4 _ Delay + _ +
VD1
VD2 VD3
VSS
Pin Description
Pin Number RT9541- CE RT9541- CER 1 2 3 4 5 6 3 4 6 1 5 2 Pin Name COUT CT VSS DOUT VDD VPin Function Output of Over-charge Detection, CMOS Output Pin for External Capacitor Setting Output Delay of VD1 Ground Output of Over-discharge Detection, CMOS Output Power Supply, through a Resistor (R1) Pin for Charger Negative Input, through a Resistor (R2)
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_
+
Short Circuit Detector
DOUT
COUT
V-
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RT9541
Applications Information
(1) Operation Description
Preliminary
Refering to the "Function Block Diagram", when charging voltage crosses the detector threshold from a low value to a value higher than VDET1, the output of COUT pin, the output of over-charge detector/VD1, swiches to low level,..charger's negative pin level. After detecting over-charge the VD1 can be reset and the output of COUT pin becomes "H" when the VDD voltage is coming down to a level lower than "VDET1 - VHYS1", or when a charger is disconnected from the battery pack. The output of DOUT pin, the output of over-discharge detector/VD2, switches to "L" after internally fixed delay time passed, when discharging voltage crosses the detector threshold from a high value to a value lower than VDET2. An excess load current can be sensed and cut off after internally fixed delay time passsed through the built in excess current detector, VD3, with DOUT being enabled to low level. Once after detecting excess current, the VD3 is released and DOUT level switches to "H" by detaching a battery pack from a load system. Futher, short circuit protector makes DOUT level to "L" immediately with external short circuit current and removing external short circuit leads DOUT level to "H".
The short circuit protection function in charging direction was also provided. When COUT high and the "V-" pin voltage 5V lower than VSS pin, the RT9541 will turn low COUT with a fixed delay. The COUT will go high after the short circuit condition was removed. After detecting over-discharge, supply current will be kept extremely low by halting some internal circuits operation. The output delay of over-charge detectors can be set by connecting an external capacitor. Output type of COUT and DOUT are CMOS. (2) Component Selection Guide: Referring to "Typical Application Circuit", R1 and C1 will stabilize a supply voltage to the RT9541. A recommended R1 value is less than 1k. A larger value of R1 leads higher detection voltage, makes some errors, because of shoot through current flowed in the RT9541. R2 and C2 will stabilize a V- pin voltage. The resetting from over-discharge with connecting charger possibly be disabled by larger value of R2. Recommended value is less than 1k. And recommended C2 value is less than 1F. R1 and R2 can operate as a current limiter against
The excess charging current is also monitored, and the charging path will be cut off (by turn low COUT) after excess charging current was detected lasting a internally fixed delay time. The charging path will be re-started (by turn high COUT) after another internally fixed delay. If the excess charging current is still there, the same process will be repeated and cause the charging path toggling on and off with a 12.5% on duty. Such a protection function reduces the average charging current to 12.5% of original value when excess charging current detected.
setting cell reverse direction or for applying excess charging voltage to the RT9541. While smaller R1 and R2 may cause an over power dissipation rating of the RT9541 and a total of "R1+R2" should be more than 1k.
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Preliminary Timing Diagram
RT9541- CE/CER
RT9541
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RT9541
Package Information
Preliminary
D
C
B
b
A e A1 L
H
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 -1.397 0.356 2.591 2.692 0.838 0.102 0.356 Max 1.295 0.152 1.803 0.559 2.997 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.035 -0.055 0.014 0.102 0.106 0.033 0.004 0.014 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
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Preliminary
RT9541
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RT9541
Preliminary
RICHTEK TECHNOLOGY CORP.
Headquarter
6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, No. 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
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