High-Voltage Switcher with Linearly Regulated Output NCP10970 The NCP10970 includes a highvoltage switcher, linear regulator and a dedicated comparator circuitry. The switcher is suitable for building output voltage up to 16 V (adjustable by resistor divider on www.onsemi.com FB pin) protected against shortcircuit. Dedicated internal circuitry prevents continuous conduction mode (CCM) operation improves the surge robustness, efficiency and EMI. In no load/light load conditions, the part enters skip cycle operation and ensures low standby power consumption. A proprietary technique ensures high efficiency in the SOIC16 NB, LESS PIN 15 CASE 752AC downconversion process from output switcher voltage rail to raw sub voltage rail supplying a linear regulator. A dedicated comparator circuitry provides a means to instruct the MARKING DIAGRAM control section that an overtemperature point has been reached. The 16 comparator input is biased by a precise constant current source and 1097xyyG output is an open drain type. ON AWLYWW To ensure the very low noload standby power, the device is equipped with a very effective standby mode with a low wakeup time 1 for return to the normal operation mode. 1097xyy = Specific Device Code (x = 0, yy = A1, B1) Features A = Assembly Location Builtin 670 V, 18 R Lateral MOSFET DS(on) WL = Wafer Lot Y = Year Highvoltage Startup Current Source WW = Work Week Fixedfrequency DCM Currentmode Control Scheme G = PbFree Package End of Demagnetization Detection Ensures DCM Operation only Shortcircuit Protected Switcher Output with Autorecovery PIN CONNECTIONS Function 4 ms Soft Start SOURCE 1 16 DRAIN Internal Linear Regulator with Shortcircuit Protected Output VCC 2 Internal Comparator with Open Drain Output Internal Thermal Shutdown DMG 3 14 GND 16pin SO Package with Creepage Distance FB 4 13 CMPIN These are PbFree Devices COMP 5 12 VRAW Typical Applications Power Management for Smart Lighting Application NC 6 11 LDOOUT Power Management for White Goods, IoT Application, etc. INT 7 10 STBY VCCLV 8 9 CMPOUT ORDERING INFORMATION See detailed ordering and shipping information on page 22 of this data sheet. Semiconductor Components Industries, LLC, 2020 1 Publication Order Number: March, 2020 Rev. 0 NCP10970/DNCP10970 Figure 1. Application Schematic PIN FUNCTION DESCRIPTION Pin No. Pin Name Function Description 1 SOURCE The switcher ground This pin is connected to the buck source/inductor junction and grounds the switcher circuitry. The dissipated heat of the transistor is conducted out through this pin. 2 VCC Supplies the switcher section The switcher V voltage up to 20 V. CC 3 DMG Demagnetization detection This pin monitors the inductor magnetic activity. 4 FB Feedback pin This pin senses the output voltage through a resistive divider. 5 COMP Loop compensation The error amplifier output is available on this pin. The network connected between this pin and ground adjusts the control loop bandwidth. 6 NC Not connected pin Not connected pin for better isolation between high voltage and low voltage pins. 7 INT The intermediate buck point This is the input to generate the raw dc voltage. 8 VCCLV Supplies the lowvoltage section The V voltage biases the MOSFET driver, Comparator and LDO CCLV circuitry. 9 CMPOUT Comparator output Opendrain output pin of internal comparator. This pin is pulled low when the CMPIN passes above 1 V. 10 STBY Standby pin This pin affects the speed of comparator and IC consumption. Standby mode (grounded pin) slow comparator. Active mode (> 3 V on pin) fast comparator. 11 LDOOUT LDO output A shortcircuit protected 3.3 V or 5 V rail. 12 VRAW The intermediate bus rail This is the raw voltage driving the LDO. 13 CMPIN Comparator input Input of the internal comparator, internally biased by a 120 A current source. 14 GND The ground of lowvoltage section 15 Creepage distance. 16 DRAIN Drain connection The connection to the lateral MOSFET drain. www.onsemi.com 2