NCV891130 Step-Down Regulator - Automotive, Low-Iq, Dual-Mode 1.2 A, 2 MHz www.onsemi.com The NCV891130 is a Dual Mode regulator intended for Automotive, batteryconnected applications that must operate with up to a 45 V input supply. Depending on the output load, it operates either as a PWM 8 Buck Converter or as a Low DropOut Linear Regulator, and is suitable 1 for systems with low noise and Low Quiescent Current requirements SOIC8 often encountered in automotive driver information systems. A reset EXPOSED PAD pin (with fixed delay) simplifies interfacing with a microcontroller. CASE 751AC The NCV891130 also provides several protection features expected in automotive power supply systems such as current limit, short circuit protection, and thermal shutdown. In addition, the high switching MARKING DIAGRAM frequency produces low output voltage ripple even when using small 8 inductor values and an allceramic output filter capacitor forming a 891130XX spaceefficient switching regulator solution. ALYW Features 30 A Iq in Light Load Condition 1 1.2 A Maximum Output Current in PWM Mode With XX = 33 for 3.3 V Output Internal Nchannel Power Switch = 40 for 4.0 V Output = 50 for 5.0 V Output V Operating Range 3.7 V to 36 V IN A = Assembly Location Withstands Load Dump to 45 V L = Wafer Lot Y = Year Logic Level Enable Pin can be Tied to Battery W = Work Week Fixed Output Voltage of 5.0 V, 4.0 V or 3.3 V = PbFree Device 2 MHz Freerunning Switching Frequency 2 % Output Voltage Accuracy PIN CONNECTIONS NCV Prefix for Automotive Requiring Site and Control Changes 1 8 VIN SW These Devices are PbFree and are RoHS Compliant Typical Applications 2 7 DRV BST Audio Infotainment 3 6 RSTB VOUT Instrumentation GND 4 5 EN SafetyVision Systems (Top View) CDRV DBST NCV891130 L1 VOUT VIN VIN SW ORDERING INFORMATION CBST See detailed ordering and shipping information on page 13 of CIN DFW DRV BST COUT this data sheet. RESET VOUT RSTB EN GND EN Figure 1. Typical Application Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: August, 2019 Rev. 1 NCV891130/DNCV891130 CDRV DBST VIN SW VIN L1 VOUT CIN 3.3 V DFW CBST COUT Reg DRV BST Low PWM Oscillator LOGIC ON OFF Enable VOUT + + + comp EN 1.2 A EN detector + TSD SoftStart RESET VOLTAGES MONITORS RSTB RESET Switcher Supply ON LINEAR REGULATOR MODE ON OVLD SELECTION + GND Logic NCV891130 Figure 2. Simplified Block Diagram Table 1. PIN FUNCTION DESCRIPTION Pin No. Pin Name Description 1 VIN Input voltage from battery. Place an input filter capacitor in close proximity to this pin. 2 DRV Output voltage to provide a regulated voltage to the Power Switch gate driver. 3 RSTB Reset function. Open drain output, pulling down to ground when the output voltage is out of regulation. 4 GND Battery return, and output voltage ground reference. 5 EN This TTL compatible Enable input allows the direct connection of Battery as the enable signal. Grounding this input stops switching and reduces quiescent current draw to a minimum. 6 VOUT Output voltage feedback and LDO output. Feedback of output voltage used for regulation, as well as LDO output in LDO mode. 7 BST Bootstrap input provides drive voltage higher than VIN to the N channel Power Switch for minimum switch Rdson and highest efficiency. 8 SW Switching node of the Regulator. Connect the output inductor and cathode of the freewheeling diode to this pin. EPAD Connect to Pin 4 (electrical ground) and to a low thermal resistance path to the ambient temperature environment. www.onsemi.com 2 + +