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ISL6843IUZ-T

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ISL6843IUZ-T

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Part Number ISL6843IUZ-T
Manufacturer Intersil
Description IC REG CTRLR BOOST/FLYBACK 8MSOP
Datasheet ISL6843IUZ-T Datasheet
Package 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
In Stock 8,564 piece(s)
Unit Price $ 1.2420 *
Lead Time Can Ship Immediately
Estimated Delivery Time Dec 4 - Dec 9 (Choose Expedited Shipping)
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Part Number # ISL6843IUZ-T (PMIC - Voltage Regulators - DC DC Switching Controllers) is manufactured by Intersil and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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ISL6843IUZ-T Specifications

ManufacturerIntersil
CategoryIntegrated Circuits (ICs) - PMIC - Voltage Regulators - DC DC Switching Controllers
Datasheet ISL6843IUZ-TDatasheet
Package8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Series-
Output TypeTransistor Driver
FunctionStep-Up, Step-Up/Step-Down
Output ConfigurationPositive, Isolation Capable
TopologyBoost, Flyback
Number of Outputs1
Output Phases1
Voltage - Supply (Vcc/Vdd)9 V ~ 16 V
Frequency - SwitchingUp to 2MHz
Duty Cycle (Max)96%
Synchronous RectifierYes
Clock SyncNo
Serial Interfaces-
Control FeaturesCurrent Limit, Frequency Control
Operating Temperature-40°C ~ 105°C (TA)
Package / Case8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package8-MSOP

ISL6843IUZ-T Datasheet

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FN9124 Rev 13.00 February 18, 2015 ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845 Improved Industry Standard Single-Ended Current Mode PWM Controller DATASHEETThe ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845 family of adjustable frequency, low power, pulse width modulating (PWM) current mode controllers is designed for a wide range of power conversion applications including boost, flyback, and isolated output configurations. Peak current mode control effectively handles power transients and provides inherent overcurrent protection. This advanced BiCMOS design is pin compatible with the industry standard 384x family of controllers and offers significantly improved performance. Features include low operating current, 60µA start-up current, adjustable operating frequency to 2MHz, and high peak current drive capability with 20ns rise and fall times. Pinouts ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845 (8 LD SOIC, MSOP) TOP VIEW ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845 (8 LD DFN) TOP VIEW Features • 1A MOSFET Gate Driver • 60µA Start-up Current, 100µA Maximum • 25ns Propagation Delay Current Sense to Output • Fast Transient Response with Peak Current Mode Control • Adjustable Switching Frequency to 2MHz • 20ns Rise and Fall Times with 1nF Output Load • Trimmed Timing Capacitor Discharge Current for Accurate Deadtime/Maximum Duty Cycle Control • High Bandwidth Error Amplifier • Tight Tolerance Voltage Reference Over Line, Load, and Temperature • Tight Tolerance Current Limit Threshold • Pb-Free Available (RoHS Compliant) Applications • Telecom and Datacom Power • Wireless Base Station Power • File Server Power • Industrial Power Systems • PC Power Supplies • Isolated Buck and Flyback Regulators • Boost Regulators PART NUMBER RISING UVLO (V) MAX. DUTY CYCLE (%) ISL6840 7.0 100 ISL6841 7.0 50 ISL6842 14.4 100 ISL6843 8.4 100 ISL6844 14.4 50 ISL6845 8.4 50 COMP FB RTCT VREF VDD OUT GND 1 2 3 4 8 CS 7 6 5 2 3 4 1 7 6 5 8COMP FB CS RTCT VREF VDD OUT GNDFN9124 Rev 13.00 Page 1 of 14 February 18, 2015

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ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845Ordering Information PART NUMBER (Note 4) PART MARKING TEMP RANGE (°C) PACKAGE PKG. DWG. # ISL6840IRZ-T (Notes 2, 3) 40Z -40 to +105 8 Ld 2x3 DFN (Pb-free) L8.2x3 ISL6840IUZ (Notes 1, 3) 6840Z -40 to +105 8 Ld MSOP (Pb-free) M8.118 ISL6841IUZ (Notes 1, 3) 6841Z -40 to +105 8 Ld MSOP (Pb-free) M8.118 ISL6842IBZ (Notes 1, 3) 6842 IBZ -40 to +105 8 Ld SOIC (Pb-free) M8.15 ISL6842IRZ-T (Notes 2, 3) (No longer available, recommended replacement: ISL6842IBZ-T) 42Z -40 to +105 8 Ld 2x3 DFN (Pb-free) L8.2x3 ISL6842IUZ (Notes 1, 3) (No longer available, recommended replacement: ISL6842IBZ) 6842Z -40 to +105 8 Ld MSOP (Pb-free) M8.118 ISL6843IBZ (Notes 1, 3) 6843 IBZ -40 to +105 8 Ld SOIC (Pb-free) M8.15 ISL6843IU-T (No longer available, recommended replacement: ISL6843IUZ-T) 6843 -40 to +105 8 Ld MSOP M8.118 ISL6843IUZ (Notes 1, 3) 6843Z -40 to +105 8 Ld MSOP (Pb-free) M8.118 ISL6844IBZ (Notes 1, 3) (No longer available, recommended replacement: ISL8844AABZ) 6844 IBZ -40 to +105 8 Ld SOIC (Pb-free) M8.15 ISL6845IBZ (Notes 1, 3) (No longer available, recommended replacement: ISL8845AABZ) 6845 IBZ -40 to +105 8 Ld SOIC (Pb-free) M8.15 ISL6841EVAL3Z Evaluation Board NOTES: 1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. Contact Factory for Availability. 3. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is 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. 4. For Moisture Sensitivity Level (MSL), please see device information page for ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845.For more information on MSL please see tech brief TB363.FN9124 Rev 13.00 Page 2 of 14 February 18, 2015

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F N 9 12 4 R e v 1 3.00 P ag e 3 of 1 4 F eb ru a ry 18 , 20 15 IS L6840, IS L6841, IS L6842 , IS L6843, IS L6844, IS L6845 BG + - VREF OUTFunctional Block Diagram ON VDD CS FB RTCT GND PWM COMPARATOR RESET DOMINANT 2.5V ENABLE 8.4mA 2.6V 0.7V OSCILLATOR COMPARATOR + - UVLO COMPARATOR VREF 5.00V + -BG +- 100mV ERROR AMPLIFIER + - VREF + - ON + - S R Q Q COMP VREF UV COMPARATOR 4.65V 4.80V A = 0.5 + - CLOCK 1.1V CLAMP 2R R T Q Q ISL6841/ISL6844/ISL6845 P/N UVLO ON/OFF -40, -41 7.0/6.6V -42, -44 14.3/8.8V -43, -45 8.4/7.2V A VREF FAULT VDD OK ONLY

Page 5

F N 9 12 4 R e v 1 3.00 P ag e 4 of 1 4 F eb ru a ry 18 , 20 15 IS L6840, IS L6841, IS L6842 , IS L6843, IS L6844, IS L6845 RETURN +1.8V +3.3V U3 C14 C13 R15 R19 R17 R18 R20 C15 C16 C12 C11 + +21 C22 C20 + Typical Application - 48V Input Dual Output Flyback VIN+ VIN- T1 Q3 36V TO 75V VR1 C1 C2 C3 R1 R3 C4 Q1 R4 CR6 C5 R22 U2 CR2 CR5 CR4 C17 R21 R16 R13 C8 R10R6 CR1 C C19 + C6 ISL684x VDD RTCT CS FB OUT COMP VREF GND R26 R27 U4

Page 6

F N 9 12 4 R e v 1 3.00 P ag e 5 of 1 4 F eb ru a ry 18 , 20 15 IS L6840, IS L6841, IS L6842 , IS L6843, IS L6844, IS L6845 C9 C8 R7 2 C5 C3 VIN+ +VOUT RETURN R5 R6Typical Application - Boost Converter VIN+ VIN- C1 Q1 R1 R4 CR1 C C6C7 R3 + R2 C4 L1 U1 IS L 6 8 4x OUTCS RTCT FB COMP VREF VDD GND R8 C10

Page 7

ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845Absolute Maximum Ratings Thermal Information Supply Voltage, VDD . . . . . . . . . . . . . . . . . . . GND - 0.3V to +20.0V OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GND - 0.3V to VDD + 0.3V Signal Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 6.0V Peak GATE Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1A Operating Conditions Temperature Range ISL684xIx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C ISL684xCx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C Supply Voltage Range (Typical, Note 8) ISL6840, ISL6841. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5V to 14V ISL6843, ISL6845. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V to 16V ISL6842, ISL6844. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V to 18V Thermal Resistance (Typical) JA (°C/W) JC (°C/W) DFN Package (Notes 5, 6) . . . . . . . . . . 77 6 SOIC Package (Note 5) . . . . . . . . . . . . 100 N/A MSOP Package (Notes 5, 7) . . . . . . . . 165 62 Maximum Junction Temperature . . . . . . . . . . . . . . . -55°C to +150°C Maximum Storage Temperature Range . . . . . . . . . . -65°C to +150°C Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. NOTES: 5. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 6. For JC, the “case temp” location is the center of the exposed metal pad on the package underside. 7. For JC, the “case temp” location is taken at the package top center. 8. All voltages are with respect to GND. Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” and “Typical Application” schematic on pages 3 and 4. VDD = 15V (Note 12), Rt = 10k, Ct = 3.3nF, TA = -40°C to +105°C (Industrial) or TA = 0°C to +70°C (Commercial), Typical values are at TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +105°C or 0°C to +70°C. PARAMETER TEST CONDITIONS MIN (Note 9) TYP MAX (Note 9) UNITS UNDERVOLTAGE LOCKOUT START Threshold (ISL6840, ISL6841) 6.5 7.0 7.5 V START Threshold (ISL6843, ISL6845) 7.8 8.4 9.0 V START Threshold (ISL6842, ISL6844) 13.3 14.3 15.3 V STOP Threshold (ISL6840, ISL6841) 6.1 6.6 6.9 V STOP Threshold (ISL6843, ISL6845) 6.7 7.2 7.7 V STOP Threshold (ISL6843C Only) 6.6 7.2 7.8 V STOP Threshold (ISL6842, ISL6844) 8.0 8.8 9.6 V Hysteresis (ISL6840, ISL6841) - 0.4 - V Hysteresis (ISL6843, ISL6845) - 0.8 - V Hysteresis (ISL6842, ISL6844) - 5.4 - V Start-up Current, IDD VDD < START Threshold - 60 100 µA Operating Current, IDD (Note 10) - 3.3 4.0 mA Operating Supply Current, ID Includes 1nF GATE loading - 4.1 5.5 mA REFERENCE VOLTAGE Overall Accuracy Over line (VDD = 12V to 18V), load, temperature 4.925 5.000 5.050 V Overall Accuracy (ISL6843C Only) 4.82 5.000 5.18 V Long Term Stability TA = +125°C, 1000 hours (Note 11) - 5 - mV Fault Voltage 4.40 4.65 4.85 V VREF Good Voltage 4.60 4.80 VREF - 0.05 V Hysteresis 50 165 250 mVFN9124 Rev 13.00 Page 6 of 14 February 18, 2015

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ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845Current Limit, Sourcing -20 - - mA Current Limit, Sinking 5 - - mA CURRENT SENSE Input Bias Current VCS = 1V -1.0 - 1.0 µA CS Offset Voltage VCS = 0V (Note 11) 95 100 105 mV COMP to PWM Comparator Offset Voltage VCS = 0V (Note 11) 0.80 1.15 1.30 V Input Signal, Maximum 0.91 0.97 1.03 V Input Signal, Maximum (ISL6843C Only) 0.9 0.97 1.07 V Gain, ACS = VCOMP/VCS 0 < VCS < 910mV, VFB = 0V (Note 11) 2.5 3.0 3.5 V/V CS to OUT Delay (Note 11) - 25 40 ns CS to OUT Delay (ISL6843C Only) (Note 11) 70 ns ERROR AMPLIFIER Open Loop Voltage Gain (Note 11) 60 90 - dB Open Loop Voltage Gain (ISL6843C Only) (Note 11) 55 dB Unity Gain Bandwidth (Note 11) 3.5 5 - MHz Reference Voltage VFB = VCOMP 2.475 2.514 2.55 V FB Input Bias Current VFB = 0V -1.0 -0.2 1.0 µA COMP Sink Current VCOMP = 1.5V, VFB = 2.7V 1.0 - - mA COMP Source Current VCOMP = 1.5V, VFB = 2.3V -0.4 - - mA COMP VOH VFB = 2.3V 4.80 - VREF V COMP VOL VFB = 2.7V 0.4 - 1.0 V PSRR Frequency = 120Hz, VDD = 12V to 18V (Note 11) 60 80 - dB OSCILLATOR Frequency Accuracy Initial, TJ = +25°C 49 52 55 kHz Frequency Variation with VDD T = +25°C (f18V - f12V)/f12V - 0.2 1.0 % Temperature Stability (Note 11) - - 5 % Amplitude, Peak-to-Peak - 1.9 - V RTCT Discharge Voltage - 0.7 - V Discharge Current RTCT = 2.0V 7.2 8.4 9.5 mA OUTPUT Gate VOH VDD to OUT, IOUT = -200mA - 1.0 2.0 V Gate VOL OUT to GND, IOUT = 200mA - 1.0 2.0 V Peak Output Current COUT = 1nF (Note 11) - 1.0 - A Rise Time COUT = 1nF (Note 11) - 20 40 ns Fall Time COUT = 1nF (Note 11) - 20 40 ns PWM Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” and “Typical Application” schematic on pages 3 and 4. VDD = 15V (Note 12), Rt = 10k, Ct = 3.3nF, TA = -40°C to +105°C (Industrial) or TA = 0°C to +70°C (Commercial), Typical values are at TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +105°C or 0°C to +70°C. (Continued) PARAMETER TEST CONDITIONS MIN (Note 9) TYP MAX (Note 9) UNITSFN9124 Rev 13.00 Page 7 of 14 February 18, 2015

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ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845Maximum Duty Cycle ISL6840, ISL6842, ISL6843 94 96 - % ISL6841, ISL6844, ISL6845 47 48 - % Minimum Duty Cycle ISL6840, ISL6842, ISL6843 - - 0 % ISL6841, ISL6844, ISL6845 - - 0 % NOTES: 9. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and are not production tested. 10. This is the VDD current consumed when the device is active but not switching. Does not include gate drive current. 11. Limits established by characterization and are not production tested. 12. Adjust VDD above the start threshold and then lower to 15V. Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” and “Typical Application” schematic on pages 3 and 4. VDD = 15V (Note 12), Rt = 10k, Ct = 3.3nF, TA = -40°C to +105°C (Industrial) or TA = 0°C to +70°C (Commercial), Typical values are at TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +105°C or 0°C to +70°C. (Continued) PARAMETER TEST CONDITIONS MIN (Note 9) TYP MAX (Note 9) UNITS Typical Performance Curves FIGURE 1. FREQUENCY vs TEMPERATURE FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE FIGURE 3. EA REFERENCE vs TEMPERATURE FIGURE 4. RESISTANCE FOR CT CAPACITOR VALUES GIVEN 1.02 1.01 1.00 0.99 0.98 0.97 -40 -10 20 50 80 110 TEMPERATURE (°C) N O R M A L IZ E D F R E Q U E N C Y TEMPERATURE (°C) N O R M A L IZ E D V R E F 1.001 1.000 0.999 0.998 0.997 0.996 0.995 -40 -25 -10 5 20 35 50 65 80 95 110 TEMPERATURE (°C) N O R M A L IZ E D E A R E F E R E N C E 1.002 1.000 0.998 0.996 0.994 -40 -25 -10 5 20 35 50 65 80 95 110 103 100 10 1 10 20 30 40 50 60 70 80 90 100 RT (kΩ) F R E Q U E N C Y ( k H z) 100pF 220pF 330pF 470pF 1.0nF 2.2nF 3.3nF 4.7nFFN9124 Rev 13.00 Page 8 of 14 February 18, 2015

Page 10

ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845Pin Descriptions RTCT - This is the oscillator timing control pin. The operational frequency and maximum duty cycle are set by connecting a resistor, RT, between VREF and this pin and a timing capacitor, CT, from this pin to GND. The oscillator produces a sawtooth waveform with a programmable frequency range up to 2.0MHz. The charge time, tC, the discharge time, tD, the switching frequency, f, and the maximum duty cycle, Dmax, can be calculated from Equations 1, 2, 3 and 4: Figure 4 may be used as a guideline in selecting the capacitor and resistor values required for a given frequency. COMP - COMP is the output of the error amplifier and the input of the PWM comparator. The control loop frequency compensation network is connected between the COMP and FB pins. FB - The output voltage feedback is connected to the inverting input of the error amplifier through this pin. The non-inverting input of the error amplifier is internally tied to a reference voltage. CS - This is the current sense input to the PWM comparator. The range of the input signal is nominally 0V to 1.0V and has an internal offset of 100mV. GND - GND is the power and small signal reference ground for all functions. OUT - This is the drive output to the power switching device. It is a high current output capable of driving the gate of a power MOSFET with peak currents of 1.0A. VDD - VDD is the power connection for the device. The total supply current will depend on the load applied to OUT. Total IDD current is the sum of the operating current and the average output current. Knowing the operating frequency, f, and the MOSFET gate charge, Qg, the average output current can be calculated in Equation 5: To optimize noise immunity, bypass VDD to GND with a ceramic capacitor as close to the VDD and GND pins as possible. VREF - The 5.00V reference voltage output. +1.0/-1.5% tolerance over line, load and operating temperature. Bypass to GND with a 0.1µF to 3.3µF capacitor to filter this output as needed. Functional Description Features The ISL684x current mode PWMs make an ideal choice for low-cost flyback and forward topology applications. With its greatly improved performance over industry standard parts, it is the obvious choice for new designs or existing designs which require updating. Oscillator The ISL684x family of controllers have a sawtooth oscillator with a programmable frequency range to 2MHz, which can be programmed with a resistor from VREF and a capacitor to GND on the RTCT pin. (Please refer to Figure 4 for the resistor and capacitance required for a given frequency.) Soft-Start Operation Soft-start must be implemented externally. One method, illustrated in Figure 5, clamps the voltage on COMP. Gate Drive The ISL684x family are capable of sourcing and sinking 1A peak current. To limit the peak current through the IC, an optional external resistor may be placed between the totem-pole output of the IC (OUT pin) and the gate of the MOSFET. This small series resistor also damps any oscillations caused by the resonant tank of the parasitic inductances in the traces of the board and the FET’s input capacitance. Slope Compensation For applications where the maximum duty cycle is less than 50%, slope compensation may be used to improve noise immunity, particularly at lighter loads. The amount of slope compensation required for noise immunity is determined empirically, but is generally about 10% of the full scale current feedback signal. For applications where the duty cycle is greater than 50%, slope compensation is required to prevent instability. The minimum amount of slope compensation required corresponds to 1/2 the inductor downslope. Adding excessive slope compensation, however, results in a control loop that behaves more as a voltage mode controller than as a current mode controller. Slope compensation may be added to the CS signal shown in Figure 7. tC 0.583 RT CT (EQ. 1) tD RT– CT 0.0083 RT 4.3– 0.0083 RT 2.4– ----------------------------------------------   ln (EQ. 2) f 1 tC tD+ = (EQ. 3) D tC f= (EQ. 4) (EQ. 5)IOUT Qg f= FIGURE 5. SOFT-START VREF COMP GND IS L 6 8 4x FN9124 Rev 13.00 Page 9 of 14 February 18, 2015

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