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Part Number ISL6292BCRZ-T
Manufacturer Renesas Electronics America
Datasheet ISL6292BCRZ-T Datasheet
Package 16-VQFN Exposed Pad
In Stock 1,149 piece(s)
Unit Price $ 1.0920 *
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ISL6292BCRZ-T Specifications

ManufacturerRenesas Electronics America
CategoryIntegrated Circuits (ICs) - PMIC - Battery Chargers
Datasheet ISL6292BCRZ-TDatasheet
Package16-VQFN Exposed Pad
Battery ChemistryLithium-Ion
Number of Cells1
Current - ChargingConstant - Programmable
Programmable FeaturesTimer
Fault Protection-
Charge Current - Max1.5A
Battery Pack Voltage4.2V
Voltage - Supply (Max)6.5V
Operating Temperature-20°C ~ 70°C (TA)
Mounting Type-
Package / Case16-VQFN Exposed Pad
Supplier Device Package16-QFN (4x4)

ISL6292BCRZ-T Datasheet

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FN9139 Rev.1.00 April 19, 2005 ISL6292B Li-ion/Li Polymer Battery Charger DATASHEETThe ISL6292B uses Intersil’s patent-pending dual-mode charge technology to minimize the heat in a linear charger. The ISL6292B is a modification of the original ISL6292 and is optimized for cellular phone travel charger applications. The low-heat generation feature of the dual-mode charger enables the charger IC to be placed inside the connector of the travel charger to completely remove the influence of the adapter cable on the charging performance. Working with a current-limited ac/dc converter, the dual- mode charger charges a Li-ion battery with the same current profile as a traditional linear charger. The constant charge current is determined by the current limit of the ac/dc converter. The constant output voltage is fixed at 4.2V. When the battery voltage is below 2.8V, the charger preconditions the battery with a low trickle-charge current. The charge status is indicated by a tri-color LED. A safety timer prevents charging a dead battery for an excessively long period. The ISL6292B also features a thermal foldback function that automatically reduces the charge current when the internal die temperature exceeds a 100°C limit to prevent further temperature rise. This function removes the concern of thermal failure in the targeted space-limited applications. An ambient temperature monitoring circuit allows users to set two separate temperature limit levels, one for during charge and one for not during charge. The thermally-enhanced QFN package further improves the thermal performance of the ISL6292B in space-limited applications. Pinout ISL6292B TOP VIEW Features • Complete Charger for Single-Cell Li-ion Batteries • Integrated Pass Element and Current Sensor • No External Blocking Diode Required • Very Low Thermal Dual-Mode Operation • 1% Voltage Accuracy with Remote Sense • Programmable Current Limit up to 1.5A • Programmable End-of-Charge Current • Programmable Safety Timer • Drives a Tri-Color LED • Charge Current Thermal Foldback • NTC Thermistor Interface for Battery Temperature Monitor • Two-Level Ambient Temperature Setting • Guaranteed to Operate at 2.65V After Start-Up • Ambient Temperature Range: -20°C to 70°C • Thermally-Enhanced QFN Packages • QFN Package: - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile • Pb-Free Available (RoHS Compliant) Applications • Handheld Devices including Medical Handhelds • PDAs, Cell Phones and Smart Phones • Portable Instruments, MP3 Players • Self-Charging Battery Packs • Stand-Alone Chargers • USB Bus-Powered Chargers Related Literature • Technical Brief TB363 “Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)” • Technical Brief TB379 “Thermal Characterization of Packaged Semiconductor Devices” • Technical Brief TB389 “PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages” Ordering Information PART NUMBER TEMP. RANGE (°C) PKG. DWG. # ISL6292BCR* -20 to 70 16 Ld 4x4 QFN ISL6292BCRZ* (Note) -20 to 70 16 Ld 4x4 QFN (Pb-free) *Add “-T” suffix for tape and reel. NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. GRN 1 3 4 15 VIN RED TIME V IN V IN B A T B A T 16 14 13 2 12 10 9 11 65 7 8 VSEN TEMP IMIN IREF G N D V 2 P 9 D T E N FN9139 Rev.1.00 Page 1 of 12 April 19, 2005

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ISL6292BAbsolute Maximum Ratings Thermal Information Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 7V Output Pin (BAT, VSEN, RED, GRN, DT) . . . . . . . . . . . -0.3 to 5.5V Signal Pin (EN, TIME TEMP, IREF, IMIN, V2P9) . . . . . . -0.3 to 3.2V Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6A ESD Rating Human Body Model (Per MIL-STD-883 Method 3015.7) . . .3500V Machine Model (Per EIAJ ED-4701 Method C-111) . . . . . . . .200V Recommended Operating Conditions Ambient Temperature Range. . . . . . . . . . . . . . . . . . . .-20°C to 70°C Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 6.5V Recommended Charge Current. . . . . . . . . . . . . . . . 400mA to 1.5A Thermal Resistance (Notes 1, 2) JA (°C/W) JC (°C/W) 4x4 QFN Package . . . . . . . . . . . . . . . . 41 4 Maximum Junction Temperature (Plastic Package) . . . . . . . . 150°C Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTES: 1. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech Brief TB379. 2. JC, “case temperature” location is at the center of the exposed metal pad on the package underside. See Tech Brief TB379. Electrical Specifications Typical values are tested at VIN = 5V and 25°C Ambient Temperature, maximum and minimum values are guaranteed over -10°C to 70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless otherwise noted. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS POWER-ON RESET Rising VIN Threshold 3.0 3.4 4.0 V Falling VIN Threshold 2.3 2.4 2.7 V STANDBY CURRENT VBAT Pin Sink Current ISTANDBY VIN floating or EN pin is floating - - 3.0 A VIN Pin Supply Current IVIN BAT Pin floating, EN = LOW - 0.5 - mA VOLTAGE REGULATION Output Voltage VCH 4.158 4.20 4.242 V Dropout Voltage VBAT = 3.7V, ICHARGE = 0.65A - 190 - mV CHARGE CURRENT Charge/Protection Current (Note 3) ICHARGE RIREF = 80k, VBAT = 3.7V, VIN = 5V 0.9 1.0 1.1 A Trickle Charge Current ITRICKLE RIREF = 80k, VBAT = 2.0V, VIN = 5V 85 110 135 mA End-of-Charge Threshold RIMIN = 133k 40 60 80 mA RECHARGE THRESHOLD Recharge Voltage Threshold VRECHRG 3.85 4.00 4.13 V TRICKLE CHARGE THRESHOLD Trickle Charge Threshold Voltage VMIN 2.7 2.8 3.2 V BATTERY TEMPERATURE MONITORING Low Temperature Threshold VTMIN V2P9 = 3.0V 1.44 1.50 1.58 V Low Temperature Hysteresis (Note 4) - 214 - mV High Temperature Threshold VTMAX V2P9 = 3.0V 0.35 0.38 0.405 V High Temperature Hysteresis (Note 4) - 51.4 - mV DT Pin MOSFET On Resistance RDT - 30 100  Charge Current Foldback Threshold (Note 4) TFOLD 85 100 115 °C Current Foldback Gain (Note 4) GFOLD - 100 - mA/°CFN9139 Rev.1.00 Page 2 of 12 April 19, 2005

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ISL6292BOSCILLATOR Oscillation Period TOSC CTIME = 15nF 2.4 3.0 3.6 ms LOGIC INPUT AND OUTPUT EN Input Low - - 0.8 V EN Pin External Pull Down to Disable - - 50 k RED Sink Current Pin Voltage = 0.8V 5 - - mA GRN Sink Current Pin Voltage = 0.8V 5 - - mA NOTES: 3. The actual current may be lower due to the thermal foldback. 4. Guaranteed by design, not a tested parameter. Electrical Specifications Typical values are tested at VIN = 5V and 25°C Ambient Temperature, maximum and minimum values are guaranteed over -10°C to 70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless otherwise noted. (Continued) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITSFN9139 Rev.1.00 Page 3 of 12 April 19, 2005

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ISL6292BPin Description VIN VIN is the input power source. Connect to a wall adapter. RED, GRN RED and GRN are two open-drain outputs to drive a red and a green LED in the same package. The RED and the GRN pins are guaranteed to be capable of sinking at least 5mA current. TIME The TIME pin determines the oscillation period by connecting a timing capacitor between this pin and GND. The oscillator provides a time reference for the charger. GND GND is the connection to system ground. V2P9 This is a 2.9V untrimmed voltage output. This pin outputs a 2.9V voltage source when the input voltage is above POR threshold, independent on the EN pin input. The V2P9 pin can be used as an indication for adapter presence. EN EN is the enable logic input. Connect the EN pin to LOW to enable the charger or leave it floating to disable the charger. This pin is pulled up to 2.9V when left floating. IREF This is the programming input for the constant charging current in a linear charger. In the typical application of a dual-mode charger, the IREF pin programs the trickle charge current as well as the protection current level. IMIN IMIN is the programmable input for the end-of-charge current. TEMP TEMP is the input for an external NTC thermistor. DT DT is the input to set the temperature difference before and after the charging starts. This pin can also be used as an indication whether or not the charger is charging. VSEN VSEN is the battery voltage sensing input. This pin allows remote sense of the battery pack voltage. BAT BAT is the charger output. Typical Application IS L 6292B VIN V2P9 TEMP GND BAT Input C1 To Battery C3 BAT+ BAT- ID R 1 R2 R T C 2 DT RED GRN D 2 D 1 EN TIME CTIME IREF R IREF IMIN R IMIN VSEN C 4 R3 R S R 4R5 C1, C3: 1F X5R ceramic capacitor C2, C4: 0.1F X5R ceramic capacitor CTIME : 22nF X5R or better timing capacitor D1, D2: dual-color (red and green) LED in one package R1: 41.2k, 1% R2: TBD, value dependent on the T (2.3k for 20°C) RT: ECTH-160808-103-J-3800HT, 10k at 25°C, 5% RS: 1.33k, 1% R3: 10k, 5% (R3 and C4 are for improving ESD protection)RIREF : 80k, 1% RIMIN : 133k, 1% R4, R5: 330, 5%FN9139 Rev.1.00 Page 4 of 12 April 19, 2005

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ISL6292BBlock Diagram LOGIC RED ISEN VIN BAT 100000:1 Current Mirror COUNTER + - + - VMIN + - + - VCH IREF + - IMIN TEMP GRN Recharge Minbat Under Temp VRECHRG CA VA MIN_I Input_OK IR ISEN IMIN V2P 8 CHRG + - + - Input_OK VPOR Trickle/Fast References V2P9Temperature Monitoring Current References IT NTC Interface Over Temp TIME OSC GND VIN V C H V M IN V P O R V R E C H R G QMAIN QSEN RIREF RIMIN C1 EN DT VSEN + 100mV - FN9139 Rev.1.00 Page 5 of 12 April 19, 2005

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ISL6292BFlow Chart TEMP FAULT Charger: OFF LED: YELLOW TRICKLE CHARGE Charger: ON LED: RED FAST CHARGE Charger: ON LED: RED CHARGE TERMINATES Charger: OFF LED: GREEN RECHARGE Charger: ON LED: GREEN TIMEOUT FAULT Charger: OFF LED: YELLOW Anytime POR and Enable occurs VBAT > 2.8V before 1/8 TIMEOUT completes VBAT > VRECHRG and ICHG < IMIN and TIMEOUT not completed VBAT < VRECHRG TIMEOUT completes TEMP fault removed VBAT < 2.8V when 1/8 TIMEOUT completes CHARGE COMPLETES BUT NOT TERMINATES Charger: ON LED: GREEN TIMEOUT completes TIMEOUT completes and VBAT > VRECHRG TEMP fault TEMP fault TEMP FAULT Charger: OFF LED: YELLOW TEMP fault TEMP fault removed TEMP FAULT Charger: OFF LED: YELLOW TEMP fault removed TEMP fault TEMP fault CHARGE TERMINATES Charger: OFF LED: GREEN TIMEOUT completes and VBAT < VRECHRGFN9139 Rev.1.00 Page 6 of 12 April 19, 2005

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ISL6292BTheory of Operation The ISL6292B is based on the Intersil Patent-pending dual-mode charging technology. The dual-mode technology generates very low heat, which enables the charger to be used in space-limited applications. To take advantage of the low-heat feature, a current-limited ac/dc converter is required as the power supply to the charger. The current-limited supply has the I-V characteristics shown in Figure 1. The supply is a dc source before the load current reaches the limited current ILIM. Once the current limit is reached, the supply current cannot increase further; instead, the supply voltage falls. The current-limited supply is equivalent to a voltage source with an equivalent output impedance or a current source, depending on the region it operates at, as shown in Figure 1. The ISL6292B charges a battery with the traditional constant current/constant voltage (CC/CV) profile. The constant current is determined by the current limit ILIM of the supply during the constant-current charge mode. To ensure dual- mode operation, the current protection level set by the IREF pin should be higher than ILIM. In the constant-voltage charge mode, the battery voltage is regulated at 4.2V. When the battery voltage is below the VMIN given in the Electrical Specification, the charger preconditions the battery using trickle charge mode. The trickle-charge current is 10% of the protection current level programmed by the IREF pin. Figure 2 shows the typical waveforms in a charge cycle of the dual mode operation. When the battery is below VMIN, the charge current is 10% of IREF set by the IREF pin. Since the charge current is much less than the ILIM, the ac/dc converter operates in the voltage source region. Once the battery voltage exceeds VMIN, the charger starts to fully turn on the internal P-channel power MOSFET. The ac/dc converter operates in the current-limited region and its voltage is pulled down to a level slightly higher than the battery voltage. As shown in Figure 2, the charge current is ILIM and is lower than IREF. As the battery voltage reaches the 4.2V VCH, the charge current starts to decrease. The ac/dc supply moves out of the current-limit region and becomes a voltage source again. When the charge current reaches a programmable end-of-charge (EOC) level set by the IMIN pin, the charger sends out an EOC indication. The real termination of the charger happens at the end of a total charge time set by the TIME pin. The power dissipation is also shown in Figure 2. The power dissipation in both the trickle mode and the constant-current (CC) mode are very low. The possible peak power occurs at the transition from the CC mode to the constant-voltage (CV) mode. This peak power is much lower than the peak power normally seen in a linear charger and can be further reduced by properly designing the ac/dc converter. One simple approach is to design the ac/dc converter output voltage just high enough to fully charge the battery (normally lower than 5V). More information can be found in the ISL6292 datasheet available at To ensure the thermal safety, the ISL6292B has an internal thermal fold- back function that automatically reduces the charge current if the internal temperature typically rises above 100°C. The ISL6292B offers many other features. The trickle current, the CC charge current, and the end-of-charge (EOC) current are all programmable. A thermal foldback function monitors the internal temperature and reduces the charge current when the internal temperature rises above 100°C to prevent further temperature rise. A safety timer sets the charge time limit for both trickle mode and fast mode charge. When the battery voltage drops after the charge cycle terminates, the charger automatically starts recharging the battery to full. Two indication pins are designed to drive a tri-color LED (a red and a green LED in the same package). A simple thermistor circuit interface allows the user to set a different level of ambient temperature before and after the charger starts. All these features are described in detail in the Application Information section. FIGURE 1. THE I-V CHARACTERISTICS OF THE CURRENT- LIMITED AC/DC CONVERTER. VNL VFL ILIM rO VNL I LIM rO = (VNL - VFL)/ILIM A B C FIGURE 2. TYPICAL CHARGE CURVES USING A CURRENT- LIMITED ADAPTER. VCH VMIN VIN IREF IREF/10 P1 P2 ILIM Trickle Mode Constant Current Mode Constant Voltage Mode Inhibit TIMEOUT Input Voltage Battery Voltage Charge Current Power DissipationFN9139 Rev.1.00 Page 7 of 12 April 19, 2005

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ISL6292BApplications Information Power-On Reset (POR) The ISL6292B has a 3.4V rising POR threshold. Before the input voltage reaches the POR threshold, the 2.9V V2P9 pin outputs 0V and the charger is disabled. Once the POR threshold is reached, the V2P9 pin outputs 2.9V, the open- drain MOSFET on the DT pin is turned on, and the ambient temperature monitoring circuit starts to function. After a delay and after the input voltage rises above the battery voltage, the charger control circuit starts to work and the DT pin impedance becomes high. Figure 3 shows the sequence of the events at power on. The POR has a falling threshold of 2.4V typically. At power on, all counters are reset to zero. Charge Current and RIREF Selection When the ISL6292B is used as a traditional linear charger, the RIREF sets the constant charge current. The trickle charge current is 10% of the CC current IREF. When working with a current-limited supply, the CC current is determined by the supply limited current ILIM. IREF needs to be programmed higher than ILIM and is used as an overcurrent protection. Taking into account the tolerance of both the ILIM and IREF, it is recommended the IREF be programmed at least 30% higher than the ILIM. IREF can be found by the following equation: (EQ. 1) The trickle charge current is 10% of IREF, that is, (EQ. 2) The ISL6292B has a comparator with 100mV offset voltage to ensure the input voltage is higher than the battery voltage before charging starts (see the Block Diagram). This condition requires ILIM be higher than 400mA. The upper limit for ILIM is 1.5A. EOC Current and RIMIN Selection The EOC current is programmed by the IMIN pin and can be calculated by the following equation: (EQ. 3) The EOC current has a programming range up to 400mA. To qualify as an EOC condition, the charge current needs to drop below the IMIN level and stay below the IMIN level for more than three to four cycles of the internal oscillator; additionally, the battery voltage rises above the recharge threshold given in the Electrical Specification table. Internal Oscillator The internal oscillator establishes a timing reference. The oscillation period is programmable with an external timing capacitor, CTIME, as shown in Typical Applications. The oscillator charges the timing capacitor to 1.5V and then discharges it to 0.5V in one period, both with 10A current. The period TOSC is: (EQ. 4) A 1nF capacitor results in a 0.2ms oscillation period. The accuracy of the period is mainly dependent on the accuracy of the capacitance and the internal current source. Total Charge Time and CTIME Selection The total charge time for the CC mode and CV mode is limited to a length of TIMEOUT, which can be found by: (EQ. 5) FIGURE 3. EVENT SEQUENCE AT POWER UP VIN V2P9 DT Imped Charger Start POR IREF 0.8V RIREF ----------------- 10 5 A = ITrickle 0.8V RIREF ----------------- 10 4 A = IMIN 0.8V RIMIN ---------------- 10 4 A = TOSC 0.2 10 6 CTIME= ondssec  FIGURE 4. OPERATION WAVEFORMS VIN V2P9 RED GRN VBAT I CHG 15 Cycle s to 1/8 TIM EOUT 15 Cycle s POR Thre shold t0 t1 t2 t3 t4 t5 t6 t7 t8 Charge Cycle Charge Cycle IMIN DT Impe d. MIN RECHRGV 2.8V VMIN TIMEOUT 14 CTIME 1nF -----------------= minutes FN9139 Rev.1.00 Page 8 of 12 April 19, 2005

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ISL6292BCTIME is the timing capacitor shown in the Typical Application circuit. A 1nF capacitor leads to 14 minutes of TIMEOUT. For example, a 15nF capacitor sets the TIMEOUT to be 3.5 hours. The charger is terminated when the TIMEOUT is reached. The trickle mode charge has a time limit of 1/8 TIMEOUT. If the battery voltage does not reach VMIN within that limit, a TIMEOUT fault is issued and the charger latches up. The charger stays in trickle mode for at least 15 cycles of the internal oscillator and, at most, 1/8 of TIMEOUT. Recharge Threshold The charger terminates when the TIMEOUT limit expires. After the termination, if the battery is below the recharge threshold given in the Electrical Specification table, the charger starts a re-charge cycle. LED Indications RED and GRN are two open-drain outputs that directly drive a tri-color LED. At the moment when the power is applied or when the charger is enabled through the EN pin, the charger starts to charge and the RED indication pin outputs a low impedance to drive a red LED. Once the charge finishes (either when the EOC condition is qualified or when the TIMEOUT completes), the GRN pin turns on to drive a green LED and the red LED is off. The green LED remains on unless the input power is recycled, or when the EN pin is toggled, or a fault case happens. When a recharge occurs, the indication remains in green. When a fault case happens, both the RED and the GRN pins are on to indicate a yellow color. If the FAULT is a TIMEOUT fault, the yellow indication is latched and can only be reset through the EN pin or the input power. If the FAULT is an ambient temperature FAULT, the charger restarts after the fault condition is removed. When not powered or when not enabled, both LEDs are off. Table 1 summarizes the LED indications. VSEN Pin The VSEN pin allows remote sensing of the battery voltage to minimize the resistive voltage drop between the charger output and the battery positive terminal. Figure 5 shows the internal voltage feedback circuit. In applications that the remote sense pin goes through a connector, a local low- value resistor is recommended, as the R1 shown in Figure 5, in case the connector has bad contact. The sum of R2 and R3 is 75k, therefore, a 10 R1 is negligible in output voltage accuracy. Ambient Temperature Sensing The TEMP pin is used to set the ambient temperature range that allows charging the battery. Typically, an NTC (negative temperature coefficient) resistor is mounted on the printed circuit board (PCB) to monitor the ambient temperature. Due to the self-heating of the PCB during charging, the ISL6292B provides the DT pin to set a higher temperature threshold after the charger starts. Figure 6 shows the internal circuit for the ambient temperature sensing function. The two comparators form a window comparator whose high-threshold is VTMIN and low- threshold is VTMAX. These two thresholds are given in the Electrical Specifications. The two MOSFETs (Q1 and Q2) FIGURE 5. THE INTERNAL VOLTAGE FEEDBACK CIRCUIT + - BAT VSEN R2 Q1 R3 VA Enable VREF R1 10 TABLE 1. LED INDICATION SUMMARY STATUS RED GRN INDICATION Charging L H Red Full Charge (EOC), or recharging H L Green Trickle TIMEOUT Error L L Yellow (Latched) Over/Under Ambient Temperature L L Yellow No Battery H H Off FIGURE 6. THE INTERNAL AND EXTERNAL CIRCUIT FOR THE NTC INTERFACE + - + - V2P9 TEMP DT 2.9V R1 100K R2 75K R3 25K R4 4K Q1 Q2 CP1 CP2 Under Temp Over Temp R U To TEMP Pin V TMIN VTMAX RT Q3 R D GND CHGFN9139 Rev.1.00 Page 9 of 12 April 19, 2005

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December 19, 2020

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