IC资料-ISL6292C Voltage Supervisor.pdf

92CZ YTTT Pin 1 Location code Trace code CONTROLLED DOCUMENT AS OF : 2004-10-14 23:08:24 EDT DATE PRINTED: 2004-10-14 23:08:25 EDTBRAND/PACK CARD FG NAME : ISL6292CCR3Z-T PL: D3K - HH BATTERY MGMT STATUS : RELEASED COMPLIANT: N CUSTOMER : ANY CUST. P/N : CUST. P/N REV : BRAND BRLD: BL12160G BRSP: DATE CODE= NA TSTF : P F-ISL6292-07 A F-ISL6292-RESCREEN PD NAME P/A PKG LEADS 53277A04L+L04CZ 53107A04L+L04CZ P A LMB LMB 10 10 BURN-IN : X TYPE BRNR SPEC OUTLINE DRAWING DR NO : DR407L TITLE : QFN (CHIPPAC) FINAL LEAD FINISH : M : Pb-Free 100% Matte Tin Plate MICRO CIRCUIT GROUP : POWER DATA PACK C OF C: GROUP A : N GROUP B : N GROUP C : N GROUP D : N BARCODE INNER1: 429-27S6BAMID1: 429-27S6BAOUTER1: 429-27S8AQ INNER2: 429-27S3LFMID2: 429-27S3LF OUTER2: PACK SLIP: PACKING METHOD: 429-200-PK107B-L2 TITLE : TAPE molding compounds/die attach materials and 100% matte tin plate termination finish, which is 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-020B. VBATVIN 5V Input ISL6292C C1 V2P8 EN GND IREF FAULT VSEN STATUS TIME CTIME Floating to Enable C2 C3 RIREF Pinout ISL6292C (3x3 DFN) TOP VIEW VIN FAULT STATUS TIME GND VBAT VSEN IREF V2P8 EN 2 3 4 1 5 9 8 7 10 6 Data SheetAugust 2004 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143|Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2004. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. 2 Absolute Maximum RatingsThermal Information Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 7V Output Pin Voltage (BAT, VSEN, V2P8) . . . . . . . . . . . . -0.3 to 5.5V Signal Input Voltage (TIME, IREF). . . . . . . . . . . . . . . . . -0.3 to 3.2V Output Pin Voltage (STATUS, FAULT) . . . . . . . . . . . . . . . -0.3 to 7V Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6A ESD Rating Human Body Model (Per MIL-STD-883 Method 3015.7). . .1500V Machine Model (Per EIAJ ED-4701 Method C-111) . . . . . . .150V Recommended Operating Conditions Ambient Temperature Range. . . . . . . . . . . . . . . . . . . .-20°C to 70°C Supply Voltage, VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 6.5V Thermal Resistance (Junction to Ambient) (Note 1)JA (°C/W) 3x3 DFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Thermal Resistance (Junction to Case) (Note 2)JC (°C/W) 3x3 DFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 SpecificationsTypical values are tested at VIN = 5V and 25°C Ambient Temperature, maximum and minimum values are guaranteed over 0°C to 70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless otherwise noted. PARAMETERSYMBOLTEST CONDITIONSMINTYPMAXUNITS POWER-ON RESET Rising VIN Threshold3.03.43.95V Falling VIN Threshold2.252.42.65V STANDBY CURRENT VBAT Pin Sink CurrentISTANDBYVIN floating or EN = LOW-3.0µA VIN Pin Supply CurrentIVINVBAT floating and EN pulled low-30-µA VIN Pin Supply CurrentIVINVBAT floating and EN floating-1-mA VOLTAGE REGULATION Output VoltageVCH4.204.2564.30V Dropout VoltageVBAT = 3.7V, 0.5A-175-mV CHARGE CURRENT Constant Charge Current (Note 3)ICHARGERIREF = 80k, VBAT = 3.7V0.91.01.1A Trickle Charge CurrentITRICKLERIREF = 80k, VBAT = 2.0V-110-mA End-of-Charge ThresholdIMINRIREF = 80k85110135mA RECHARGE THRESHOLD Recharge Voltage ThresholdVRECHRG3.904.0534.155V TRICKLE CHARGE THRESHOLD Trickle Charge Threshold VoltageVMIN2.732.843.04V TEMPERATURE MONITORING Charge Current Foldback Threshold (Note 4)TFOLD85100115°C Current Foldback Gain (Note 4)GFOLD -100-mA/°C ISL6292C 3 Pin Descriptions VIN (Pin1) VIN is the input power source. Connect to a wall adapter. FAULT (Pin 2) FAULT is an open-drain output indicating fault status. This pin is pulled to LOW under any fault conditions. Any time a FAULT condition happens, it will reset the counter of the charger. STATUS (Pin 3) STATUS is an open-drain output indicating charging and inhibit states. The STATUS pin is pulled LOW when the charger is charging a battery. It will be forced to high impedence when the charge current drops to IMIN. This high impedence mode will be latched until a recharge cycle or a new charge cycle starts. TIME (Pin 4) The TIME pin determines the oscillation period by connecting a timing capacitor between this pin and GND. The oscillator also provides a time reference for the charger. GND (Pin 5) GND is the connection to system ground. EN (Pin 6) EN is the enable logic input. Connect the EN pin to LOW to disable the charger or leave it floating to enable the charger. V2P8 (Pin 7) This is a 2.8V reference voltage output. This pin outputs a 2.8V voltage source when the input voltage is above POR threshold, otherwise it outputs zero. The V2P8 pin can be used as an indication for adapter presence. IREF (Pin 8) This is the programming input for the constant charging current. It maintains at 0.8V when the charger is in normal operation. VSEN (Pin 9) VSEN is the remote voltage sense pin. Connect this pin as close as possible to the battery pack positive connection. If the VSEN pin is floating, its voltage drops to zero volt and the charger operates in the Trickle mode. VBAT (Pin 10) VBAT is the connection to the battery. Typically a 10µF Tantalum capacitor is needed for stability when there is no battery attached. When a battery is attached, only a 0.1µF ceramic capacitor is required. OSCILLATOR Oscillation PeriodTOSCCTIME = 15nF2.43.03.6ms LOGIC OUTPUTS STATUS/FAULT Sink CurrentPin Voltage = 0.8V5-mA NOTES: 3. The actual charge current may be affected by the thermal foldback function if the thermal dissipation capability is not enough or by the on resistance of the power MOSFET if the charger input voltage is too close to the output voltage. 4. Guaranteed by design, not a tested parameter. Electrical SpecificationsTypical values are tested at VIN = 5V and 25°C Ambient Temperature, maximum and minimum values are guaranteed over 0°C to 70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless otherwise noted. (Continued) PARAMETERSYMBOLTEST CONDITIONSMINTYPMAXUNITS ISL6292C 4 Typical Applications Block Diagram V2P8 EN GND VBAT IREF FAULT VIN5V WALL ADAPTER BATTERY PACK VSEN STATUS TIME RIREF C1 CTIME ISL6292C 1k1k 15nF 10µF 80k R1 C3 D1D2 1µF C2 10µF R2 LOGIC STATUS ISEN VINVBAT 100000:1 Current Mirror COUNTER + - + - VMIN + - + - VCH IREF + - FAULT Recharge Minbat VRECHRG CA VA MIN_I IR ISEN IMIN CHRG STATUS FAULT + - + - Input_OK VPOR Trickle/Fast REFERENCESV2P8 TEMPERATURE MONITORING CURRENT REFERENCES IT TIME OSC GND VIN VCH VMIN VPOR VRECHRG QMAIN QSEN RIREF C1 = IR/10 VSEN + 100mV - EN Input_OK VIN VIN ESD Diode FIGURE 1. BLOCK DIAGRAM ISL6292C 5 Charging Flow Chart FIGURE 2. CHARGING FLOW CHART Power Up POR VINVPOR? Y N CV Charge Y N N TIMEOUT? Y N Initialization Reset counter Trickle Charge VSENVMIN? 1/8 TIMEOUT? N Y Y N Trickle Charge CC Charge VSEN=VCH? TIMEOUT? Y Y N N Constant Current Charge Constant Voltage Charge charger inhibited reset counter VSEN VRECHRG? Start recharge N Y Inhibit EOC or FAULT N set FAULT low latch up charger EN toggled ? Y N Ich IMIN ? N TIMEOUT? Y EOC indication: set STATUS high keep FAULT high ISL6292C 6 Theory of Operation The ISL6292C is an integrated charger for single-cell Li-ion or Li-polymer batteries. The ISL6292C functions as a traditional linear charger when powered with a voltage- source adapter. When powered with a current-limited adapter, the charger minimizes the thermal dissipation commonly seen in traditional linear chargers. As a linear charger, the ISL6292C charges a battery in the popular constant current (CC) and constant voltage (CV) profile. The constant charge current IREF is programmable up to 1.5A with an external resistor. The charge voltage VCH has 1% accuracy over the entire recommended operating condition range. The charger always preconditions the battery with 10% of the programmed current at the beginning of a charge cycle, until the battery voltage is verified to be above the minimum fast charge voltage, VMIN. This low- current preconditioning charge mode is named trickle mode. The verification takes 15 cycles of an internal oscillator whose period is programmable with the timing capacitor. A thermal-foldback feature removes the thermal concern typically seen in linear chargers. The charger reduces the charge current automatically as the IC internal temperature rises above 100°C to prevent further temperature rise. The thermal-foldback feature guarantees safe operation when the printed circuit board (PCB) is space limited for thermal dissipation. The charger offers a safety timer for setting the fast charge time (TIMEOUT) limit to prevent charging a dead battery for an extensively long time. The trickle mode is limited to 1/8 of TIMEOUT. The charger automatically re-charges the battery when the battery voltage drops below a recharge threshold. When the wall adapter is not present, the ISL6292C draws less than 1µA current from the battery. Three indication pins are available from the charger to indicate the charge status. The V2P8 outputs a 2.8V dc voltage when the input voltage is above the power-on reset (POR) level and can be used as the power-present indication. This pin is capable of sourcing a 2mA current, so it can also be used to bias external circuits. The STATUS pin is an open-drain logic output that turns LOW at the beginning of a charge cycle until the end-of- charge (EOC) condition is qualified. The EOC condition is: the battery voltage rises above the recharge threshold and the charge current falls below a user-programmable EOC current threshold. Once the EOC condition is qualified, the STATUS output rises to HIGH and is latched. The latch is released at the beginning of a charge or re-charge cycle. The open-drain FAULT pin turns low when a charge time fault occurs or when the IREF pin is pulled below 0.35V or above 1.4V. Figure 3 shows the typical charge curves in a traditional linear charger powered with a constant-voltage adapter. From the top to bottom, the curves represent the constant input voltage, the battery voltage, the charge current and the power dissipation in the charger. The power dissipation PCH is given by the following equation: (EQ. 1) where ICHARGE is the charge current. The maximum power dissipation occurs during the beginning of the CC mode. The maximum power the IC is capable of dissipating is dependent on the thermal impedance of the printed-circuit board (PCB). Figure 3 shows, with dotted lines, two cases that the charge currents are limited by the maximum power dissipation capability due to the thermal foldback. FIGURE 3. TYPICAL CHARGE CURVES USING A CONSTANT-VOLTAGE ADAPTER VCH VMIN VIN IREF IREF/10 P1 P2 P3 Trickle Mode Constant Current Mode Constant Voltage Mode Inhibit TIMEOUT Input Voltage Battery Voltage Charge Current Power Dissipation PCHVINVBAT() ICHARGE= FIGURE 4. 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 Dissipation ISL6292C 補充充電模式恆流充電模式恆壓充電模式充電停止 7 When using a current-limited adapter, the thermal situation in the ISL6292C is totally different. Figure 4 shows the typical charge curves when a current-limited adapter is employed. The operation requires the IREF to be programmed higher than the limited current ILIM of the adapter, as shown in Figure 4. The key difference of the charger operating under such conditions occurs during the CC mode. The Block Diagram, Figure 1, aids in understanding the operation. The current loop consists of the current amplifier CA and the sense MOSFET QSEN. The current reference IR is programmed by the IREF pin. The current amplifier CA regulates the gate of the sense MOSFET QSEN so that the sensed current ISEN matches the reference current IR. The main MOSFET QMAIN and the sense MOSFET QSEN form a current mirror with a ratio of 100,000:1, that is, the output charge current is 100,000 times IR. In the CC mode, the current loop tries to increase the charge current by enhancing the sense MOSFET QSEN, so that the sensed current matches the reference current. On the other hand, the adapter current is limited, the actual output current will never meet what is required by the current reference. As a result, the current error amplifier CA keeps enhancing the QSEN as well as the main MOSFET QMAIN, until they are fully turned on. Therefore, the main MOSFET becomes a power switch instead of a linear regulation device. The power dissipation in the CC mode becomes: where RDS(ON) is the resistance when the main MOSFET is fully turned on. This power is typically much less than the peak power in the traditional linear mode. The worst power dissipation when using a current-limited adapter typically occurs at the beginning of the CV mode, as shown in Figure 4. The equation (EQ. 1) applies during the CV mode. When using a very small PCB whose thermal impedance is relatively large, it is possible that the internal temperature can still reach the thermal foldback threshold. In that case, the IC is thermally protected by lowering the charge current, as shown by the dotted lines in the charge current and power curves. Appropriate design of the adapter can further reduce the peak power dissipation of the ISL6292C. See the Application Information section of the ISL6292 data sheet (www.intersil.com) for more information. Figure 5 illustrates the typical signal waveforms for the linear charger from the power-up to a recharge cycle. More detailed Applications Information is given below. Applications Information Power on Reset (POR) The ISL6292C resets itself as the input voltage rises above the POR rising threshold. The V2P8 pin outputs a 2.8V voltage,