ISL8560IRZ

DATASHEET ISL8560 FN9244 Rev 7.00 September 19, 2008 DC/DC Power Switching Regulator The ISL8560 is a step down DC/DC power switching regulator which accepts 9.0V to 60V input and provides a 2A output current. The output voltage can be set in the range between 1.21V and 55V by means of an external divider. The device uses an internal power DMOS transistor with a typical rDS(ON) of 0.19 to obtain very high efficiency and high switching speed. A switching frequency in the range of 100kHz to 600kHz can be realized (the maximum power dissipation of the various packages must be observed). Notable features of this next generation of DC/DC converter includes pulse-by-pulse current limit for FET protection, hiccup mode for short circuit protection, voltage feedforward regulation, Frequency SYNC, soft-start, low standby current of 60µA typical in the disabled state, and thermal shut-down. The device is available in a 20 Ld QFN package. Features • Voltage feedforward mode • Step down DC/DC supporting up to 2A • Input voltage range of 9.0V to 60V • Internal reference of 1.21V ±1% • Adjustable output voltage range of 1.21V to 55V • Adjustable switching frequency 100kHz to 600kHz • Frequency SYNC pin • Zero load current operation • Pulse-by-pulse mode current limit and Hiccup mode • Low standby current of 60µA typical • Thermal shut-down Ordering Information PART NUMBER (Note) ISL8560IRZ PART MARKING TEMP. RANGE (°C) • Load dump to 100V for 400ms PACKAGE (Pb-Free) PKG. DWG. # ISL 8560IRZ -40 to +85 20 Ld 6x6 QFN L20.6x6B ISL8560IRZ-T* ISL 8560IRZ -40 to +85 20 Ld 6x6 QFN L20.6x6B *Please refer to TB347 for details on reel specifications. NOTE: 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. • Pb-Free (RoHS compliant) Applications • Industrial and automotive power supplies • Portable computers • Battery chargers • Distributed power systems Related Literature • Technical Brief TB363 “Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)” Pinout FN9244 Rev 7.00 September 19, 2008 VIN VIN VIN VIN LX ISL8560 (20 LD QFN) TOP VIEW 20 19 18 17 16 2 14 SS BOOT 3 13 PGND EN 4 12 PGOOD VCC5 5 11 REF 6 7 8 9 10 COMP LX FB LX SGND 15 RTCT 1 SYNC LX Page 1 of 17 ISL8560 Absolute Maximum Ratings Thermal Information Input Voltage VIN . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 72V Voltage at BOOT pin . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 82V LX, RTCT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 60V REF, FB, SS, EN, SYNC, PGOOD pins. . . . . . . . . . . . . . . . . . . . .8V VCC5* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 5.5V Thermal Resistance (Typical, Notes 1, 2) JA (°C/W) JC (°C/W) QFN Package. . . . . . . . . . . . . . . . . . . . 30 1.5 Maximum Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3W Maximum Junction Temperature (Hermetic Package or Die) . . +150°C Maximum Junction Temperature (Plastic Package) . . . . . . . +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 Recommended Operating Conditions Junction Temperature Range. . . . . . . . . . . . . . . . . .-40°C to +125°C Supply Voltage Range (Typical). . . . . . . . . . . . . . . . . . . 9.0V to 60V 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. *An accidental short between VCC5 and GND may cause excessive heating and permanent damage to the device. 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. For JC, the “case temp” location is the center of the exposed metal pad on the package underside. 3. Additional heatsinking may be required to insure that the junction temperature does not exceed above +125°C. Electrical Specifications PARAMETER Unless otherwise specified the specifications listed in the table are tested at TA = +25°C and guard band for the full Temperature Range, VIN = 48V, VOUT = 5.0V, IOUT = 0A. Typical values are at TA = +25°C. 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. SYMBOL TEST CONDITIONS MIN TYP MAX UNITS 9.0 24 60 V VIN = 9V, EN = HIGH 35 60 µA VIN = 60V, EN = HIGH 60 110 µA VIN = 9V, VFB = 1.5V 3.6 4 mA VIN = 60V, VFB = 1.5V 6.0 8.0 mA 5.0 5.1 V 5 mA 8.9 V 0.55 V VIN - 5 V VIN SUPPLY Input Voltage Range VIN SUPPLY CURRENT Shut-down Current Operating Current IDD IDD VCC5 SUPPLY (A 1µF capacitor is needed from VCC5 to GND) VCC5 Output Voltage VIN = 9.0V to 60V, IL = 0mA to 5mA Maximum Output Current VIN = 24V 4.9 INPUT UV Rising UV Threshold 7.8 UV Threshold Hysteresis 0.18 0.3 BUCK CONVERTER Output Voltage (Note 3) IOUT = 2A 1.2 Maximum Duty Cycle F = 300kHz 90 Minimum Controllable ON Time 96 % F = 300kHz 150 ns Over the VIN range with frequency set by external resistor and capacitor at RTCT ±10 % OSCILLATOR Total Variation on Set Frequency Frequency Range (Set by RTCT) fOSC 100 600 kHz SYNC Range fOSC 100 600 kHz Tested Oscillation Frequency fOSC FN9244 Rev 7.00 September 19, 2008 VIN = 9V to 60V, RT = 100k, CT = 1200pF 60 kHz VIN = 9V to 60V, RT = 27.4k, CT = 220pF 725 kHz Page 2 of 17 ISL8560 Electrical Specifications PARAMETER Max Ramp Amplitude Modulator Gain Unless otherwise specified the specifications listed in the table are tested at TA = +25°C and guard band for the full Temperature Range, VIN = 48V, VOUT = 5.0V, IOUT = 0A. Typical values are at TA = +25°C. 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. (Continued) SYMBOL VOSC TEST CONDITIONS MIN VIN = 9V VVIN/VOSC Min OFF Time TYP MAX UNITS 1 VP 9 - 150 300 ns REFERENCE AND SOFT-START Internal Reference Voltage Soft-Start Current Soft-Start Threshold 1.21 VREF ISS 8 VSOFT 0.8 gm 3.9 10 V 12 µA V ERROR AMPLIFIER Transconductance Gain-Bandwidth Product Slew Rate COMP Pin Drive 5.7 7.2 mS GBW 15 MHz SR 6 V/µs ICOMP ±200 µA Internal Feedback Voltage VFB TA = -40°C to +85°C, VIN = 9.0V to 60V Internal Feedback Bias Current IFB TA = -40°C to +85°C, VFB = 1.20V 1.194 1.210 1.222 V ±50 ±100 nA OVERCURRENT PROTECTION Dynamic Current Limit ON Time tOCON 16 Clock pulses Dynamic Current Limit OFF Time tOCOFF 4 SS cycle Switch Current Limit ILIMIT TA = +25°C 3.2 VPG- Fraction of the VOUT set point; ~3µs noise filter VPG+ Fraction of the VOUT set point; ~3µs noise filter 4.0 4.8 A 85 89 % 111 115 % VPULLUP = 5.5V 1 µA IPGOOD = 4mA 0.5 V 0.355  POWER-GOOD (OPEN DRAIN) Power-Good Lower Threshold PGOOD Leakage Current IPGLKG PGOOD Voltage Low MOSFET Switch ON-Resistance rDS(ON) IOUT = 2A, VBOOT = VIN + 5.0V, Tested at wafer level 0.19 EN Input HIGH Level (Asserted) VINHIGH Input LOW Level (Unasserted) VINLOW Input Current HIGH IENHIGH Input Current LOW IENLOW 2.6 V 1.2 V VIN = 24V 25 µA VIN = 24V 25 µA SYNC Input HIGH Level (Asserted) VINHIGH 2.6 V Input LOW Level (Unasserted) VINLOW 1.2 V Input Current HIGH ISYNCHIGH 0.2 µA Input Current LOW ISYNCLOW 0.2 µA THERMAL SHUT-DOWN Thermal Shut-down Temperature Thermal Shut-down Hysteresis FN9244 Rev 7.00 September 19, 2008 Rising Threshold 150 °C 15 °C Page 3 of 17 ISL8560 Pin Descriptions SGND (Pin 8) LX (Pins 1, 2, 15, 16) The SGND terminal of the ISL8560 provides the return path for the control and monitor portions of the IC. There are four output pins that must be connected together externally in normal operation. BOOT (Pin 3) A capacitor is connected from this pin to the output pin. An internal 10V supply and an internal Schottky diode provide the high side voltage to drive the gate of the output DMOS device. EN (Pin 4) The EN input will disable the part and shut-down all function when it is held high or left OPEN. The EN current will be 10µA typical. An internal pull-up resistor will hold the pin high. When EN = Low, the part is enabled. Connect to GND for auto start-up. VCC5 (Pin 5) VCC5 is the +5.0V output pin which provides an output of an internal supply for supply filtering purposes. A 1µF capacitor should be connected from this pin to GND. Internal VDD supply is set at 5.0V (not planned that the user would use this supply). FB (Pin 9) This is the feedback pin. The feedback ratio is set by an external resistor divider connected to the load. COMP (Pin 10) This pin is connected to the output of the Error Amplifier and is used to compensate the loop. The Error Amplifier is a GM amplifier. REF (Pin 11) 1.20V reference output. Bypass to GND with 0.01µF capacitor. PGOOD (Pin 12) This pin is an open drain output that is turned on when the feedback voltage is more than ±10% from the reference voltage, indicating that the output is not within 10% of set point. PGND (Pin 13) This pin is used as the ground connection of the power train. SYNC (Pin 6) SS (Pin 14) This pin provides a digital input pin to synchronize the internal oscillator to an external signal. When the sync function is not used, this pin can be left open or tied to GND. If the sync function is used, the RTCT timing must be set to a frequency lower than the sync input frequency. The termination of the ramp is synchronized with the rising edge of the sync input signal. There are no duty cycle restrictions on the input sync signal. Input thresholds are TTL compatible. A capacitor is connected from this pin to GND to determine the soft-start timing. The soft-start pin internal charging current is 10µA. VIN (Pins 17, 18, 19, 20) The input supply for the PWM regulator power stage. Connected to DRAIN of the high side MOSFET. RTCT (Pin 7) A resistor to VIN and a capacitor to GND determine the frequency of the saw-tooth oscillator. Resistor range is R = 20k to 100k. Capacitor range is C = 470pF to 1.2nF. The oscillator amplitude will vary from approximately 0.9V to 10V as VIN changes from 8.5V to 60V to maintain constant frequency and provide feed forward. The oscillator will have a fixed off time, which will establish the maximum on time for the regulator. This off time will be