NCV8877 Automotive Grade Start-Stop Non-Synchronous Boost Controller The NCV8877 is a Non-Synchronous Boost controller designed to supply a minimum output voltage during Start-Stop vehicle operation www.onsemi.com battery voltage sags. The controller drives an external N-channel MOSFET. The device uses peak current mode control with internal slope compensation. The IC incorporates an internal regulator that MARKING supplies charge to the gate driver. DIAGRAM Protection features include, cycle-by-cycle current limiting and 8 thermal shutdown. SOIC8 8877xx ALYW D SUFFIX 8 Additional features include low quiescent current sleep mode CASE 751 1 operation. The NCV8877 is enabled when the supply voltage drops 1 below the wake up threshold. Boost Operation is initiated when the supply voltage drops below the regulation set point. 8877xx = Specific Device Code xx = 00, 01, 20, 40 Features A = Assembly Location Automatic Enable Below Wake Up Threshold Voltage (Factory L = Wafer Lot Programmable) Y = Year W = Work Week Override Disable Function = PbFree Package Boost Mode Operation at Regulation Set Point 2% Output Accuracy Over Temperature Range PIN CONNECTIONS Peak Current Mode Control with Internal Slope Compensation Externally Adjustable Frequency Operation DISB 1 8 ROSC Wide Input Voltage Range of 2 V to 40 V, 45 V Load Dump ISNS 2 7 VC Low Quiescent Current in Sleep Mode (<12 A Typical) CyclebyCycle Current Limit Protection GND 3 6 VOUT HiccupMode Overcurrent Protection (OCP) GDRV 4 5 VDRV Thermal Shutdown (TSD) (Top View) This is a PbFree Device Typical Applications ORDERING INFORMATION Applications Requiring Regulated Voltage through Cranking and StartStop Operation Device Package Shipping NCV887700D1R2G NCV887701D1R2G NCV887711D1R2G SOIC8 2500 / Tape & (PbFree) Reel NCV887720D1R2G NCV887721D1R2G NCV887740D1R2G For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: April, 2017 Rev. 9 NCV8877/DNCV8877 BATTERY LP NRVB440MFS VOUT IN Co DB Cg DISABLE Q DISB VDRV GDRV NVMFS5844NL CDRV ISNS ROSC RSNS ROSC VOUT VC GND RC CC Figure 1. Typical Application Battery In Sleep Threshold Wake Up Threshold VOUT Regulation (Internal signal) Wakeup Internal Clamp DISB Voltage COMP GDRV Wake Up Delay GDRV Switching Delay Figure 2. Functional Waveforms PACKAGE PIN DESCRIPTIONS Pin Pin No. Symbol Function 1 DISB Disable input. This part is disabled when this pin is brought low. 2 ISNS Current sense input. Connect this pin to the source of the external NMOSFET, through a currentsense res- istor to ground to sense the switching current for regulation and current limiting. 3 GND Ground reference. 4 GDRV Gate driver output. Connect to gate of the external NMOSFET. A series resistance can be added from GDRV to the gate to tailor EMC performance. 5 VDRV Driving voltage. Internallyregulated supply for driving the external NMOSFET, sourced from VOUT. Bypass with a 1.0 F ceramic capacitor to ground. 6 VOUT Monitors output voltage and provides IC input voltage. 7 VC Output of the voltage error transconductance amplifier. An external compensator network from VC to GND is used to stabilize the converter. 8 ROSC Use a resistor to ground to set the frequency. www.onsemi.com 2