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NCV8881 Dataheets PDF



Part Number NCV8881
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description Buck Regulator
Datasheet NCV8881 DatasheetNCV8881 Datasheet (PDF)

NCV8881 Buck Regulator Automotive, Watchdog 1.5 A The NCV8881 consists of a Buck switching regulator (SMPS) with a combination SMPS output undervoltage monitor and CPU watchdog circuit. In addition, two fixed−voltage low dropout regulator outputs are provided, and share an LDO output voltage status output. Once enabled, regulator operation continues until the Watchdog signal is no longer present. The NCV8881 is intended for Automotive, battery−connected applications that must withstand a 40 V.

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NCV8881 Buck Regulator Automotive, Watchdog 1.5 A The NCV8881 consists of a Buck switching regulator (SMPS) with a combination SMPS output undervoltage monitor and CPU watchdog circuit. In addition, two fixed−voltage low dropout regulator outputs are provided, and share an LDO output voltage status output. Once enabled, regulator operation continues until the Watchdog signal is no longer present. The NCV8881 is intended for Automotive, battery−connected applications that must withstand a 40 V load dump. The switching regulator is capable of converting the typical 9 V to 19 V automotive input voltage range to outputs from 3.3 V to 8 V at a constant switching frequency, which can be resistor programmed or synchronized to an external clock signal. Enable input threshold and hysteresis are programmable, with the enable input state replicated at an open drain Ignition Buffer output. The regulators are protected by current limiting, input overvoltage and overtemperature shutdown, as well as SMPS short circuit shutdown. Features • 1.5 A Switching Regulator (internal power switch) • 100 mA, 5 V LDO Output • 40 mA, 8.5 V LDO Output • Operating Range 5 V to 19 V • Programmable SMPS Frequency • SMPS can be Synchronized to an External Clock • Programmable SMPS Output Voltage Down to 0.8 V • $2% Reference Voltage Tolerance • Internal SMPS Soft−Start • Voltage−mode SMPS Control • SMPS Cycle−by−Cycle Current Limit and Short−Circuit Protection • Internal Bootstrap Diode • Logic level Enable Input • Enable Input Hysteresis Programmable by External Resistor Divider • Enable Input State is Replicated at an Open Drain Output • CPU Watchdog with Resistor Programmable Delays • Watchdog Reset Output also Indicates SMPS Output Out of Regulation • Battery Input Withstands Load Dump to 40 V • Low Standby Current • Thermal Shutdown (TSD) • NCV Prefix for Automotive and Other Applications Requiring Site and Change Controls • These are Pb−Free Devices http://onsemi.com MARKING DIAGRAMS 16 16 1 SO−16W EP PW SUFFIX CASE 751AG NCV8881 AWLYYWWG 1 A = Assembly Location WL = Wafer Lot YY = Year WW = Work Week G = Pb−Free Package (Note: Microdot may be in either location) PIN CONNECTIONS 1 IGNBUF WDI RDLY RESB EN SYNC ROSC GND 16 5P0 LDOMON 8P5 VIN SW BST FB COMP (Top View) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 32 of this data sheet. Applications • Audio • Infotainment • Safety – Vision Systems • Instrumentation © Semiconductor Components Industries, LLC, 2011 1 September, 2019 − Rev. 1 Publication Order Number: NCV8881/D NCV8881 IGNITION BUFFER RIGBUF IGNBUF FROM CPU WATCHDOG OUT WDI 5P0 LDOMON RMON REGULATED 5.0V CS5P0 LDO MONITOR RDLY RDLY TO CPU RESET RRESB RESB ENABLE R1 R2 SYNC EN SYNC ROSC ROSC GND 8P5 BEAD C8P5 REGULATED 8.5V CS8P5 VIN CIN BATTERY SW BST CBST REGULATED SMPS OUTPUT L1 DFW CZ1 COUT RP2 RFB1 FB COMP CP1 RZ1 CP3 RFB2 Figure 1. Typical Application IGNITION BUFFER RIGBUF IGNBUF 1 BUFFERED ENABLE WATCHDOG INPUT WDI 2 RDLY 3 RDLY CPU RESET RRESB RESB 4 QIB WATCHDOG TIMER ENABLE R1 R2 QRB EN 5 CLAMP RH QH SYNC ROSC SYNC 6 ROSC 7 GND 8 OSCILLATOR LOGIC NOPULSE TSD FAULT(H) VIN_OV /UVLO ENABLE HYSTERESIS TEMP SENSE DBST2 5V REGULATOR QLM MONITOR DBST1 8.5V REGULATOR POWER SWITCH 5P0 16 LDOMON 15 RMON CS5 S+5 LDO MONITOR 8P5 14 C8P5 BEAD CS8P5 S+8.5 VIN 13 BATTERY CIN SW 12 CBST L1 BST 11 DFW SWITCHER OUT COUT SW_UV OC RUN PWM COMPARATOR NCV8881 UNDERVOLTAGE MONITOR SHORT CKT MONITOR ERROR AMP FB 10 REF CP1 RZ1 COMP 9 CZ1 RP2 CP3 RFB1 RFB2 Figure 2. NCV8881 Detailed Block Diagram http://onsemi.com 2 NCV8881 MAXIMUM RATINGS Rating Symbol Value Unit Min/Max Voltage on WDI −0.3 to 7 V Min/Max Voltage on RDLY −0.3 to 7 V Min/Max Voltage on RESB −0.3 to 7 V Min/Max Voltage on EN −0.3 to 10 V Max EN Current 10 mA Min EN Current (with zero VIN voltage) −10 mA Min/Max Voltage on SYNC −0.3 to 7 V Min/Max Voltage on ROSC −0.3 to 7 V Min/Max Voltage COMP −0.3 to 7 V Min/Max Voltage FB −0.3 to 7 V Min Voltage SW – DC − 20 ns −0.7 V −3 Max Voltage VIN to SW 40 V Max Voltage VIN 40 V Min/Max Voltage BST −0.3 to 30 V Min/Max Voltage BST to SW −0.3 to 15 V Min/Max Voltage on 8P5 −0.3 to 9.5 V Max 8P5 Current 70 mA Min/Max Voltage on LDOMON −0.3 to 7 V Min/Max Voltage on 5P0 −0.3 to 7 V Min/Max Voltage IGNBUF −0.3 to 7 V Storage Temperature range −55 to +150 °C Operating Junction Temperature Range TJ −40 to + 150 °C ESD withstand Voltage Human Body Model VESD 2.0 kV Machine Model 200 V Charged Device Model >1.0 kV Moisture Sensitivity MSL Level 1 Peak Reflow Soldering Temperature 260 °C Stresses exceeding Maximum Ratings may damage the device. Maximum Rati.


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