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| NCP1589B |
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NCP1589A, NCP1589B http://onsemi.com 3 PIN FUNCTION DESCRIPTION Pin No. Symbol Description 1 BOOT Supply rail for the floating top gate driver. To form a boost circuit, use an external diode to bring the desired input voltage to this pin (cathode connected to BOOT pin). Connect a capacitor (CBOOT) between this pin and the LX pin. Typical values for CBOOT range from 0.1 mF to 1 mF. Ensure that CBOOT is placed near the IC. 2 LX Switch node pin. This is the reference for the floating top gate driver. Connect this pin to the source of the top MOSFET. 3 UG Top gate MOSFET driver pin. Connect this pin to the gate of the top N−channel MOSFET. 4 LG Bottom gate MOSFET driver pin. Connect this pin to the gate of the bottom N−channel MOSFET. 5 GND IC ground reference. All control circuits are referenced to this pin. 6 VCC Supply rail for the internal circuitry. Operating supply range is 4.5 V to 13.2 V. Decouple with a 1 mF capacitor to GND. Ensure that this decoupling capacitor is placed near the IC. 7 COMP/EN Compensation Pin. This is the output of the error amplifier (EA) and the non−inverting input of the PWM com- parator. Use this pin in conjunction with the FB pin to compensate the voltage−control feedback loop. Pull this pin low for disable. 8 FB This pin is the inverting input to the error amplifier. Use this pin in conjunction with the COMP pin to com- pensate the voltage−control feedback loop. Connect this pin to the output resistor divider (if used) or directly to Vout. 9 VOS Voltage Offset Sense 10 PGOOD Power Good output. Pulled Low if VOS is ±10% of 0.8 V Vref. ABSOLUTE MAXIMUM RATINGS Pin Name Symbol VMAX VMIN Main Supply Voltage Input VCC 15 V −0.3 V Bootstrap Supply Voltage Input BOOT 35 V wrt/GND 40 V < 100 ns 15 V wrt/LX −0.3 V −0.3 V −0.3 V Switching Node (Bootstrap Supply Return) LX 35 V 40 V for < 100 ns −5 V −10 V for < 200 ns High−Side Driver Output (Top Gate) UG 30 V wrt/GND 15 V wrt/LX 40 V for < 100 ns −0.3 V wrt/LX −2 V for < 200 ns Low−Side Driver Output (Bottom Gate) LG VCC + 0.3 V −0.3 V −5 V for < 200 ns Feedback, VOS FB, VOS 5.0 V −0.3 V COMP/EN COMP/EN 3.6 V −0.3 V PGOOD PGOOD 7 V −0.3 V MAXIMUM RATINGS Rating Symbol Value Unit Thermal Resistance, Junction−to−Ambient RqJA 165 °C/W Thermal Resistance, Junction−to−Case RqJC 45 °C/W Operating Junction Temperature Range TJ 0 to 150 °C Operating Ambient Temperature Range TA 0 to 70 °C Storage Temperature Range Tstg −55 to +150 °C Moisture Sensitivity Level MSL 1 − Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. This device is ESD sensitive. Use standard ESD precautions when handling. |
